blob: 9529613730092f1db5cfb2561f1738149b2a4d33 [file] [log] [blame]
Eric Andersendf82f612001-06-28 07:46:40 +00001/* vi: set sw=4 ts=4: */
2/*
3 * ash shell port for busybox
4 *
5 * Copyright (c) 1989, 1991, 1993, 1994
Eric Andersen2870d962001-07-02 17:27:21 +00006 * The Regents of the University of California. All rights reserved.
Eric Andersencb57d552001-06-28 07:25:16 +00007 *
"Vladimir N. Oleynik"ddc280e2005-12-15 12:01:49 +00008 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
Eric Andersen81fe1232003-07-29 06:38:40 +00009 * was re-ported from NetBSD and debianized.
10 *
Eric Andersencb57d552001-06-28 07:25:16 +000011 * This code is derived from software contributed to Berkeley by
12 * Kenneth Almquist.
13 *
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +000014 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
Eric Andersendf82f612001-06-28 07:46:40 +000015 *
Eric Andersen81fe1232003-07-29 06:38:40 +000016 * Original BSD copyright notice is retained at the end of this file.
Eric Andersencb57d552001-06-28 07:25:16 +000017 */
18
Eric Andersenc470f442003-07-28 09:56:35 +000019/*
Denis Vlasenko653d8e72009-03-19 21:59:35 +000020 * The following should be set to reflect the type of system you have:
Eric Andersenc470f442003-07-28 09:56:35 +000021 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
22 * define SYSV if you are running under System V.
23 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
24 * define DEBUG=2 to compile in and turn on debugging.
25 *
26 * When debugging is on, debugging info will be written to ./trace and
27 * a quit signal will generate a core dump.
28 */
Denis Vlasenkof1733952009-03-19 23:21:55 +000029#define DEBUG 0
Denis Vlasenko653d8e72009-03-19 21:59:35 +000030/* Tweak debug output verbosity here */
31#define DEBUG_TIME 0
32#define DEBUG_PID 1
33#define DEBUG_SIG 1
34
Eric Andersenc470f442003-07-28 09:56:35 +000035#define PROFILE 0
Denis Vlasenko0e6f6612008-02-15 15:02:15 +000036
37#define IFS_BROKEN
38
39#define JOBS ENABLE_ASH_JOB_CONTROL
Eric Andersenc470f442003-07-28 09:56:35 +000040
Denis Vlasenkob012b102007-02-19 22:43:01 +000041#if DEBUG
Denis Vlasenko653d8e72009-03-19 21:59:35 +000042# ifndef _GNU_SOURCE
43# define _GNU_SOURCE
44# endif
Denis Vlasenkoe26b2782008-02-12 07:40:29 +000045#endif
Denis Vlasenko0e6f6612008-02-15 15:02:15 +000046
Denis Vlasenko1aa7e472007-11-28 06:49:03 +000047#include "busybox.h" /* for applet_names */
Denis Vlasenko61befda2008-11-25 01:36:03 +000048//TODO: pull in some .h and find out do we have SINGLE_APPLET_MAIN?
49//#include "applet_tables.h" doesn't work
Denis Vlasenkob012b102007-02-19 22:43:01 +000050#include <paths.h>
51#include <setjmp.h>
52#include <fnmatch.h>
Mike Frysinger98c52642009-04-02 10:02:37 +000053#include "math.h"
Denis Vlasenko61befda2008-11-25 01:36:03 +000054
55#if defined SINGLE_APPLET_MAIN
56/* STANDALONE does not make sense, and won't compile */
57#undef CONFIG_FEATURE_SH_STANDALONE
58#undef ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko5e34ff22009-04-21 11:09:40 +000059#undef IF_FEATURE_SH_STANDALONE
60#undef IF_NOT_FEATURE_SH_STANDALONE(...)
Denis Vlasenko61befda2008-11-25 01:36:03 +000061#define ENABLE_FEATURE_SH_STANDALONE 0
Denis Vlasenko5e34ff22009-04-21 11:09:40 +000062#define IF_FEATURE_SH_STANDALONE(...)
63#define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
Eric Andersencb57d552001-06-28 07:25:16 +000064#endif
65
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000066#ifndef PIPE_BUF
Denis Vlasenko653d8e72009-03-19 21:59:35 +000067# define PIPE_BUF 4096 /* amount of buffering in a pipe */
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000068#endif
69
Denis Vlasenkob012b102007-02-19 22:43:01 +000070#if defined(__uClinux__)
Denis Vlasenko653d8e72009-03-19 21:59:35 +000071# error "Do not even bother, ash will not run on NOMMU machine"
Denis Vlasenkob012b102007-02-19 22:43:01 +000072#endif
73
Denis Vlasenkob012b102007-02-19 22:43:01 +000074
Denis Vlasenko01631112007-12-16 17:20:38 +000075/* ============ Hash table sizes. Configurable. */
76
77#define VTABSIZE 39
78#define ATABSIZE 39
79#define CMDTABLESIZE 31 /* should be prime */
80
81
Denis Vlasenkob012b102007-02-19 22:43:01 +000082/* ============ Shell options */
83
84static const char *const optletters_optnames[] = {
85 "e" "errexit",
86 "f" "noglob",
87 "I" "ignoreeof",
88 "i" "interactive",
89 "m" "monitor",
90 "n" "noexec",
91 "s" "stdin",
92 "x" "xtrace",
93 "v" "verbose",
94 "C" "noclobber",
95 "a" "allexport",
96 "b" "notify",
97 "u" "nounset",
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000098 "\0" "vi"
Denis Vlasenkob012b102007-02-19 22:43:01 +000099#if DEBUG
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000100 ,"\0" "nolog"
101 ,"\0" "debug"
Denis Vlasenkob012b102007-02-19 22:43:01 +0000102#endif
103};
104
105#define optletters(n) optletters_optnames[(n)][0]
106#define optnames(n) (&optletters_optnames[(n)][1])
107
Denis Vlasenko80b8b392007-06-25 10:55:35 +0000108enum { NOPTS = ARRAY_SIZE(optletters_optnames) };
Denis Vlasenkob012b102007-02-19 22:43:01 +0000109
Eric Andersenc470f442003-07-28 09:56:35 +0000110
Denis Vlasenkob012b102007-02-19 22:43:01 +0000111/* ============ Misc data */
Eric Andersenc470f442003-07-28 09:56:35 +0000112
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000113static const char homestr[] ALIGN1 = "HOME";
114static const char snlfmt[] ALIGN1 = "%s\n";
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200115static const char msg_illnum[] ALIGN1 = "Illegal number: %s";
Denis Vlasenkoaa744452007-02-23 01:04:22 +0000116
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +0000117/*
Eric Andersenc470f442003-07-28 09:56:35 +0000118 * We enclose jmp_buf in a structure so that we can declare pointers to
119 * jump locations. The global variable handler contains the location to
Denis Vlasenkof1733952009-03-19 23:21:55 +0000120 * jump to when an exception occurs, and the global variable exception_type
Eric Andersenaff114c2004-04-14 17:51:38 +0000121 * contains a code identifying the exception. To implement nested
Eric Andersenc470f442003-07-28 09:56:35 +0000122 * exception handlers, the user should save the value of handler on entry
123 * to an inner scope, set handler to point to a jmploc structure for the
124 * inner scope, and restore handler on exit from the scope.
125 */
Eric Andersenc470f442003-07-28 09:56:35 +0000126struct jmploc {
127 jmp_buf loc;
128};
Denis Vlasenko01631112007-12-16 17:20:38 +0000129
130struct globals_misc {
131 /* pid of main shell */
132 int rootpid;
133 /* shell level: 0 for the main shell, 1 for its children, and so on */
134 int shlvl;
135#define rootshell (!shlvl)
136 char *minusc; /* argument to -c option */
137
138 char *curdir; // = nullstr; /* current working directory */
139 char *physdir; // = nullstr; /* physical working directory */
140
141 char *arg0; /* value of $0 */
142
143 struct jmploc *exception_handler;
Denis Vlasenko991a1da2008-02-10 19:02:53 +0000144
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200145 volatile int suppress_int; /* counter */
146 volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */
Denis Vlasenko991a1da2008-02-10 19:02:53 +0000147 /* last pending signal */
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200148 volatile /*sig_atomic_t*/ smallint pending_sig;
Denis Vlasenko7f88e342009-03-19 03:36:18 +0000149 smallint exception_type; /* kind of exception (0..5) */
Denis Vlasenko01631112007-12-16 17:20:38 +0000150 /* exceptions */
Eric Andersenc470f442003-07-28 09:56:35 +0000151#define EXINT 0 /* SIGINT received */
152#define EXERROR 1 /* a generic error */
153#define EXSHELLPROC 2 /* execute a shell procedure */
154#define EXEXEC 3 /* command execution failed */
155#define EXEXIT 4 /* exit the shell */
156#define EXSIG 5 /* trapped signal in wait(1) */
Eric Andersen2870d962001-07-02 17:27:21 +0000157
Denis Vlasenko01631112007-12-16 17:20:38 +0000158 smallint isloginsh;
Denis Vlasenkob07a4962008-06-22 13:16:23 +0000159 char nullstr[1]; /* zero length string */
Denis Vlasenko843cbd52008-06-27 00:23:18 +0000160
161 char optlist[NOPTS];
162#define eflag optlist[0]
163#define fflag optlist[1]
164#define Iflag optlist[2]
165#define iflag optlist[3]
166#define mflag optlist[4]
167#define nflag optlist[5]
168#define sflag optlist[6]
169#define xflag optlist[7]
170#define vflag optlist[8]
171#define Cflag optlist[9]
172#define aflag optlist[10]
173#define bflag optlist[11]
174#define uflag optlist[12]
175#define viflag optlist[13]
176#if DEBUG
177#define nolog optlist[14]
178#define debug optlist[15]
179#endif
180
181 /* trap handler commands */
Denis Vlasenko01631112007-12-16 17:20:38 +0000182 /*
183 * Sigmode records the current value of the signal handlers for the various
184 * modes. A value of zero means that the current handler is not known.
Denis Vlasenkof8535cc2008-12-03 10:36:26 +0000185 * S_HARD_IGN indicates that the signal was ignored on entry to the shell.
Denis Vlasenko01631112007-12-16 17:20:38 +0000186 */
187 char sigmode[NSIG - 1];
Denis Vlasenkof8535cc2008-12-03 10:36:26 +0000188#define S_DFL 1 /* default signal handling (SIG_DFL) */
189#define S_CATCH 2 /* signal is caught */
190#define S_IGN 3 /* signal is ignored (SIG_IGN) */
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +0000191#define S_HARD_IGN 4 /* signal is ignored permenantly */
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +0000192
Denis Vlasenko01631112007-12-16 17:20:38 +0000193 /* indicates specified signal received */
Denis Vlasenko4b875702009-03-19 13:30:04 +0000194 uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */
Denis Vlasenko843cbd52008-06-27 00:23:18 +0000195 char *trap[NSIG];
Denys Vlasenko21d87d42009-09-25 00:06:51 +0200196 char **trap_ptr; /* used only by "trap hack" */
Denis Vlasenko448d30e2008-06-27 00:24:11 +0000197
198 /* Rarely referenced stuff */
199#if ENABLE_ASH_RANDOM_SUPPORT
Denis Vlasenko26bc57d2008-06-27 00:29:34 +0000200 /* Random number generators */
201 int32_t random_galois_LFSR; /* Galois LFSR (fast but weak). signed! */
202 uint32_t random_LCG; /* LCG (fast but weak) */
Denis Vlasenko448d30e2008-06-27 00:24:11 +0000203#endif
204 pid_t backgndpid; /* pid of last background process */
205 smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */
Denis Vlasenko01631112007-12-16 17:20:38 +0000206};
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000207extern struct globals_misc *const ash_ptr_to_globals_misc;
208#define G_misc (*ash_ptr_to_globals_misc)
Denis Vlasenko26bc57d2008-06-27 00:29:34 +0000209#define rootpid (G_misc.rootpid )
210#define shlvl (G_misc.shlvl )
211#define minusc (G_misc.minusc )
212#define curdir (G_misc.curdir )
213#define physdir (G_misc.physdir )
214#define arg0 (G_misc.arg0 )
Denis Vlasenko01631112007-12-16 17:20:38 +0000215#define exception_handler (G_misc.exception_handler)
Denis Vlasenko7f88e342009-03-19 03:36:18 +0000216#define exception_type (G_misc.exception_type )
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200217#define suppress_int (G_misc.suppress_int )
218#define pending_int (G_misc.pending_int )
219#define pending_sig (G_misc.pending_sig )
Denis Vlasenko26bc57d2008-06-27 00:29:34 +0000220#define isloginsh (G_misc.isloginsh )
221#define nullstr (G_misc.nullstr )
222#define optlist (G_misc.optlist )
223#define sigmode (G_misc.sigmode )
224#define gotsig (G_misc.gotsig )
225#define trap (G_misc.trap )
Denys Vlasenko21d87d42009-09-25 00:06:51 +0200226#define trap_ptr (G_misc.trap_ptr )
Denis Vlasenko448d30e2008-06-27 00:24:11 +0000227#define random_galois_LFSR (G_misc.random_galois_LFSR)
228#define random_LCG (G_misc.random_LCG )
229#define backgndpid (G_misc.backgndpid )
230#define job_warning (G_misc.job_warning)
Denis Vlasenko01631112007-12-16 17:20:38 +0000231#define INIT_G_misc() do { \
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000232 (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \
233 barrier(); \
Denis Vlasenko01631112007-12-16 17:20:38 +0000234 curdir = nullstr; \
235 physdir = nullstr; \
Denys Vlasenko21d87d42009-09-25 00:06:51 +0200236 trap_ptr = trap; \
Denis Vlasenko01631112007-12-16 17:20:38 +0000237} while (0)
238
239
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000240/* ============ DEBUG */
241#if DEBUG
242static void trace_printf(const char *fmt, ...);
243static void trace_vprintf(const char *fmt, va_list va);
244# define TRACE(param) trace_printf param
245# define TRACEV(param) trace_vprintf param
Denis Vlasenko1bb3d7e2009-03-20 07:45:36 +0000246# define close(fd) do { \
247 int dfd = (fd); \
Denis Vlasenkob9e70dd2009-03-20 01:24:08 +0000248 if (close(dfd) < 0) \
Denys Vlasenko883cea42009-07-11 15:31:59 +0200249 bb_error_msg("bug on %d: closing %d(0x%x)", \
Denis Vlasenko1bb3d7e2009-03-20 07:45:36 +0000250 __LINE__, dfd, dfd); \
Denis Vlasenkob9e70dd2009-03-20 01:24:08 +0000251} while (0)
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000252#else
253# define TRACE(param)
254# define TRACEV(param)
255#endif
256
257
Denis Vlasenko559691a2008-10-05 18:39:31 +0000258/* ============ Utility functions */
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000259#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
260
Denys Vlasenko7cee00e2009-07-24 01:08:03 +0200261/* C99 says: "char" declaration may be signed or unsigned by default */
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000262#define signed_char2int(sc) ((int)(signed char)(sc))
263
Denis Vlasenko559691a2008-10-05 18:39:31 +0000264static int isdigit_str9(const char *str)
265{
266 int maxlen = 9 + 1; /* max 9 digits: 999999999 */
267 while (--maxlen && isdigit(*str))
268 str++;
269 return (*str == '\0');
270}
Denis Vlasenko01631112007-12-16 17:20:38 +0000271
Denis Vlasenko559691a2008-10-05 18:39:31 +0000272
273/* ============ Interrupts / exceptions */
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +0000274/*
Eric Andersen2870d962001-07-02 17:27:21 +0000275 * These macros allow the user to suspend the handling of interrupt signals
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +0000276 * over a period of time. This is similar to SIGHOLD or to sigblock, but
Eric Andersen2870d962001-07-02 17:27:21 +0000277 * much more efficient and portable. (But hacking the kernel is so much
278 * more fun than worrying about efficiency and portability. :-))
279 */
Denis Vlasenko843cbd52008-06-27 00:23:18 +0000280#define INT_OFF do { \
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200281 suppress_int++; \
Denis Vlasenko843cbd52008-06-27 00:23:18 +0000282 xbarrier(); \
283} while (0)
Denis Vlasenkob012b102007-02-19 22:43:01 +0000284
285/*
286 * Called to raise an exception. Since C doesn't include exceptions, we
287 * just do a longjmp to the exception handler. The type of exception is
Denis Vlasenko4b875702009-03-19 13:30:04 +0000288 * stored in the global variable "exception_type".
Denis Vlasenkob012b102007-02-19 22:43:01 +0000289 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000290static void raise_exception(int) NORETURN;
Denis Vlasenkob012b102007-02-19 22:43:01 +0000291static void
292raise_exception(int e)
293{
294#if DEBUG
Denis Vlasenko2da584f2007-02-19 22:44:05 +0000295 if (exception_handler == NULL)
Denis Vlasenkob012b102007-02-19 22:43:01 +0000296 abort();
297#endif
298 INT_OFF;
Denis Vlasenko7f88e342009-03-19 03:36:18 +0000299 exception_type = e;
Denis Vlasenko2da584f2007-02-19 22:44:05 +0000300 longjmp(exception_handler->loc, 1);
Denis Vlasenkob012b102007-02-19 22:43:01 +0000301}
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000302#if DEBUG
303#define raise_exception(e) do { \
304 TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \
305 raise_exception(e); \
306} while (0)
307#endif
Denis Vlasenkob012b102007-02-19 22:43:01 +0000308
309/*
310 * Called from trap.c when a SIGINT is received. (If the user specifies
311 * that SIGINT is to be trapped or ignored using the trap builtin, then
312 * this routine is not called.) Suppressint is nonzero when interrupts
313 * are held using the INT_OFF macro. (The test for iflag is just
314 * defensive programming.)
315 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000316static void raise_interrupt(void) NORETURN;
Denis Vlasenkob012b102007-02-19 22:43:01 +0000317static void
318raise_interrupt(void)
319{
Denis Vlasenko4b875702009-03-19 13:30:04 +0000320 int ex_type;
Denis Vlasenkob012b102007-02-19 22:43:01 +0000321
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200322 pending_int = 0;
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +0000323 /* Signal is not automatically unmasked after it is raised,
324 * do it ourself - unmask all signals */
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000325 sigprocmask_allsigs(SIG_UNBLOCK);
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200326 /* pending_sig = 0; - now done in onsig() */
Denis Vlasenko7c139b42007-03-21 20:17:27 +0000327
Denis Vlasenko4b875702009-03-19 13:30:04 +0000328 ex_type = EXSIG;
Denis Vlasenkob012b102007-02-19 22:43:01 +0000329 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
330 if (!(rootshell && iflag)) {
Denis Vlasenko991a1da2008-02-10 19:02:53 +0000331 /* Kill ourself with SIGINT */
Denis Vlasenkob012b102007-02-19 22:43:01 +0000332 signal(SIGINT, SIG_DFL);
333 raise(SIGINT);
334 }
Denis Vlasenko4b875702009-03-19 13:30:04 +0000335 ex_type = EXINT;
Denis Vlasenkob012b102007-02-19 22:43:01 +0000336 }
Denis Vlasenko4b875702009-03-19 13:30:04 +0000337 raise_exception(ex_type);
Denis Vlasenkob012b102007-02-19 22:43:01 +0000338 /* NOTREACHED */
339}
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000340#if DEBUG
341#define raise_interrupt() do { \
342 TRACE(("raising interrupt on line %d\n", __LINE__)); \
343 raise_interrupt(); \
344} while (0)
345#endif
Denis Vlasenkob012b102007-02-19 22:43:01 +0000346
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000347static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000348int_on(void)
Denis Vlasenkob012b102007-02-19 22:43:01 +0000349{
Denis Vlasenko0dfe1d22009-04-02 12:57:38 +0000350 xbarrier();
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200351 if (--suppress_int == 0 && pending_int) {
Denis Vlasenkob012b102007-02-19 22:43:01 +0000352 raise_interrupt();
353 }
354}
355#define INT_ON int_on()
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000356static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000357force_int_on(void)
Denis Vlasenkob012b102007-02-19 22:43:01 +0000358{
Denis Vlasenko0dfe1d22009-04-02 12:57:38 +0000359 xbarrier();
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200360 suppress_int = 0;
361 if (pending_int)
Denis Vlasenkob012b102007-02-19 22:43:01 +0000362 raise_interrupt();
363}
364#define FORCE_INT_ON force_int_on()
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000365
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200366#define SAVE_INT(v) ((v) = suppress_int)
Denis Vlasenkob012b102007-02-19 22:43:01 +0000367
Denis Vlasenko843cbd52008-06-27 00:23:18 +0000368#define RESTORE_INT(v) do { \
369 xbarrier(); \
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200370 suppress_int = (v); \
371 if (suppress_int == 0 && pending_int) \
Denis Vlasenko843cbd52008-06-27 00:23:18 +0000372 raise_interrupt(); \
373} while (0)
Denis Vlasenkob012b102007-02-19 22:43:01 +0000374
Glenn L McGrath9fef17d2002-08-22 18:41:20 +0000375
Denis Vlasenkobc54cff2007-02-23 01:05:52 +0000376/* ============ Stdout/stderr output */
Eric Andersenc470f442003-07-28 09:56:35 +0000377
Eric Andersenc470f442003-07-28 09:56:35 +0000378static void
Denis Vlasenkob012b102007-02-19 22:43:01 +0000379outstr(const char *p, FILE *file)
Denis Vlasenkoe5570da2007-02-19 22:41:55 +0000380{
Denis Vlasenkob012b102007-02-19 22:43:01 +0000381 INT_OFF;
382 fputs(p, file);
383 INT_ON;
384}
385
386static void
387flush_stdout_stderr(void)
388{
389 INT_OFF;
390 fflush(stdout);
391 fflush(stderr);
392 INT_ON;
393}
394
395static void
396flush_stderr(void)
397{
398 INT_OFF;
399 fflush(stderr);
400 INT_ON;
401}
402
403static void
404outcslow(int c, FILE *dest)
405{
406 INT_OFF;
407 putc(c, dest);
408 fflush(dest);
409 INT_ON;
410}
411
412static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2)));
413static int
414out1fmt(const char *fmt, ...)
415{
416 va_list ap;
417 int r;
418
419 INT_OFF;
420 va_start(ap, fmt);
421 r = vprintf(fmt, ap);
422 va_end(ap);
423 INT_ON;
424 return r;
425}
426
427static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4)));
428static int
429fmtstr(char *outbuf, size_t length, const char *fmt, ...)
430{
431 va_list ap;
432 int ret;
433
434 va_start(ap, fmt);
435 INT_OFF;
436 ret = vsnprintf(outbuf, length, fmt, ap);
437 va_end(ap);
438 INT_ON;
439 return ret;
440}
441
442static void
443out1str(const char *p)
444{
445 outstr(p, stdout);
446}
447
448static void
449out2str(const char *p)
450{
451 outstr(p, stderr);
452 flush_stderr();
453}
454
455
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +0000456/* ============ Parser structures */
Denis Vlasenko4d2183b2007-02-23 01:05:38 +0000457
Denis Vlasenko5651bfc2007-02-23 21:08:58 +0000458/* control characters in argument strings */
Denys Vlasenkob6c84342009-08-29 20:23:20 +0200459#define CTLESC ((unsigned char)'\201') /* escape next character */
460#define CTLVAR ((unsigned char)'\202') /* variable defn */
461#define CTLENDVAR ((unsigned char)'\203')
462#define CTLBACKQ ((unsigned char)'\204')
Denis Vlasenko5651bfc2007-02-23 21:08:58 +0000463#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
464/* CTLBACKQ | CTLQUOTE == '\205' */
Denys Vlasenkob6c84342009-08-29 20:23:20 +0200465#define CTLARI ((unsigned char)'\206') /* arithmetic expression */
466#define CTLENDARI ((unsigned char)'\207')
467#define CTLQUOTEMARK ((unsigned char)'\210')
Denis Vlasenko5651bfc2007-02-23 21:08:58 +0000468
469/* variable substitution byte (follows CTLVAR) */
470#define VSTYPE 0x0f /* type of variable substitution */
471#define VSNUL 0x10 /* colon--treat the empty string as unset */
472#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
473
474/* values of VSTYPE field */
Denis Vlasenko92e13c22008-03-25 01:17:40 +0000475#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
476#define VSMINUS 0x2 /* ${var-text} */
477#define VSPLUS 0x3 /* ${var+text} */
478#define VSQUESTION 0x4 /* ${var?message} */
479#define VSASSIGN 0x5 /* ${var=text} */
480#define VSTRIMRIGHT 0x6 /* ${var%pattern} */
481#define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
482#define VSTRIMLEFT 0x8 /* ${var#pattern} */
483#define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
484#define VSLENGTH 0xa /* ${#var} */
485#if ENABLE_ASH_BASH_COMPAT
486#define VSSUBSTR 0xc /* ${var:position:length} */
487#define VSREPLACE 0xd /* ${var/pattern/replacement} */
488#define VSREPLACEALL 0xe /* ${var//pattern/replacement} */
489#endif
Denis Vlasenko5651bfc2007-02-23 21:08:58 +0000490
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000491static const char dolatstr[] ALIGN1 = {
492 CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0'
493};
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +0000494
Denis Vlasenko559691a2008-10-05 18:39:31 +0000495#define NCMD 0
496#define NPIPE 1
497#define NREDIR 2
498#define NBACKGND 3
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000499#define NSUBSHELL 4
Denis Vlasenko559691a2008-10-05 18:39:31 +0000500#define NAND 5
501#define NOR 6
502#define NSEMI 7
503#define NIF 8
504#define NWHILE 9
505#define NUNTIL 10
506#define NFOR 11
507#define NCASE 12
508#define NCLIST 13
509#define NDEFUN 14
510#define NARG 15
511#define NTO 16
512#if ENABLE_ASH_BASH_COMPAT
513#define NTO2 17
514#endif
515#define NCLOBBER 18
516#define NFROM 19
517#define NFROMTO 20
518#define NAPPEND 21
519#define NTOFD 22
520#define NFROMFD 23
521#define NHERE 24
522#define NXHERE 25
523#define NNOT 26
Denis Vlasenko340299a2008-11-21 10:36:36 +0000524#define N_NUMBER 27
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000525
526union node;
527
528struct ncmd {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000529 smallint type; /* Nxxxx */
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000530 union node *assign;
531 union node *args;
532 union node *redirect;
533};
534
535struct npipe {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000536 smallint type;
537 smallint pipe_backgnd;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000538 struct nodelist *cmdlist;
539};
540
541struct nredir {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000542 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000543 union node *n;
544 union node *redirect;
545};
546
547struct nbinary {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000548 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000549 union node *ch1;
550 union node *ch2;
551};
552
553struct nif {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000554 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000555 union node *test;
556 union node *ifpart;
557 union node *elsepart;
558};
559
560struct nfor {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000561 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000562 union node *args;
563 union node *body;
564 char *var;
565};
566
567struct ncase {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000568 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000569 union node *expr;
570 union node *cases;
571};
572
573struct nclist {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000574 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000575 union node *next;
576 union node *pattern;
577 union node *body;
578};
579
580struct narg {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000581 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000582 union node *next;
583 char *text;
584 struct nodelist *backquote;
585};
586
Denis Vlasenko559691a2008-10-05 18:39:31 +0000587/* nfile and ndup layout must match!
588 * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight
589 * that it is actually NTO2 (>&file), and change its type.
590 */
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000591struct nfile {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000592 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000593 union node *next;
594 int fd;
Denis Vlasenko559691a2008-10-05 18:39:31 +0000595 int _unused_dupfd;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000596 union node *fname;
597 char *expfname;
598};
599
600struct ndup {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000601 smallint type;
Denis Vlasenko559691a2008-10-05 18:39:31 +0000602 union node *next;
603 int fd;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000604 int dupfd;
605 union node *vname;
Denis Vlasenko559691a2008-10-05 18:39:31 +0000606 char *_unused_expfname;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000607};
608
609struct nhere {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000610 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000611 union node *next;
612 int fd;
613 union node *doc;
614};
615
616struct nnot {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000617 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000618 union node *com;
619};
620
621union node {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000622 smallint type;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000623 struct ncmd ncmd;
624 struct npipe npipe;
625 struct nredir nredir;
626 struct nbinary nbinary;
627 struct nif nif;
628 struct nfor nfor;
629 struct ncase ncase;
630 struct nclist nclist;
631 struct narg narg;
632 struct nfile nfile;
633 struct ndup ndup;
634 struct nhere nhere;
635 struct nnot nnot;
636};
637
Denys Vlasenko86e83ec2009-07-23 22:07:07 +0200638/*
639 * NODE_EOF is returned by parsecmd when it encounters an end of file.
640 * It must be distinct from NULL.
641 */
642#define NODE_EOF ((union node *) -1L)
643
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000644struct nodelist {
645 struct nodelist *next;
646 union node *n;
647};
648
649struct funcnode {
650 int count;
651 union node n;
652};
653
Denis Vlasenko5651bfc2007-02-23 21:08:58 +0000654/*
655 * Free a parse tree.
656 */
657static void
658freefunc(struct funcnode *f)
659{
660 if (f && --f->count < 0)
661 free(f);
662}
663
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000664
665/* ============ Debugging output */
666
667#if DEBUG
668
669static FILE *tracefile;
670
671static void
672trace_printf(const char *fmt, ...)
673{
674 va_list va;
675
676 if (debug != 1)
677 return;
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000678 if (DEBUG_TIME)
679 fprintf(tracefile, "%u ", (int) time(NULL));
680 if (DEBUG_PID)
681 fprintf(tracefile, "[%u] ", (int) getpid());
682 if (DEBUG_SIG)
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200683 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000684 va_start(va, fmt);
685 vfprintf(tracefile, fmt, va);
686 va_end(va);
687}
688
689static void
690trace_vprintf(const char *fmt, va_list va)
691{
692 if (debug != 1)
693 return;
Denis Vlasenko653d8e72009-03-19 21:59:35 +0000694 if (DEBUG_TIME)
695 fprintf(tracefile, "%u ", (int) time(NULL));
696 if (DEBUG_PID)
697 fprintf(tracefile, "[%u] ", (int) getpid());
698 if (DEBUG_SIG)
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +0200699 fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int);
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000700 vfprintf(tracefile, fmt, va);
701}
702
703static void
704trace_puts(const char *s)
705{
706 if (debug != 1)
707 return;
708 fputs(s, tracefile);
709}
710
711static void
712trace_puts_quoted(char *s)
713{
714 char *p;
715 char c;
716
717 if (debug != 1)
718 return;
719 putc('"', tracefile);
720 for (p = s; *p; p++) {
721 switch (*p) {
722 case '\n': c = 'n'; goto backslash;
723 case '\t': c = 't'; goto backslash;
724 case '\r': c = 'r'; goto backslash;
725 case '"': c = '"'; goto backslash;
726 case '\\': c = '\\'; goto backslash;
727 case CTLESC: c = 'e'; goto backslash;
728 case CTLVAR: c = 'v'; goto backslash;
729 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
730 case CTLBACKQ: c = 'q'; goto backslash;
731 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
732 backslash:
733 putc('\\', tracefile);
734 putc(c, tracefile);
735 break;
736 default:
737 if (*p >= ' ' && *p <= '~')
738 putc(*p, tracefile);
739 else {
740 putc('\\', tracefile);
741 putc(*p >> 6 & 03, tracefile);
742 putc(*p >> 3 & 07, tracefile);
743 putc(*p & 07, tracefile);
744 }
745 break;
746 }
747 }
748 putc('"', tracefile);
749}
750
751static void
752trace_puts_args(char **ap)
753{
754 if (debug != 1)
755 return;
756 if (!*ap)
757 return;
758 while (1) {
759 trace_puts_quoted(*ap);
760 if (!*++ap) {
761 putc('\n', tracefile);
762 break;
763 }
764 putc(' ', tracefile);
765 }
766}
767
768static void
769opentrace(void)
770{
771 char s[100];
772#ifdef O_APPEND
773 int flags;
774#endif
775
776 if (debug != 1) {
777 if (tracefile)
778 fflush(tracefile);
779 /* leave open because libedit might be using it */
780 return;
781 }
782 strcpy(s, "./trace");
783 if (tracefile) {
784 if (!freopen(s, "a", tracefile)) {
785 fprintf(stderr, "Can't re-open %s\n", s);
786 debug = 0;
787 return;
788 }
789 } else {
790 tracefile = fopen(s, "a");
791 if (tracefile == NULL) {
792 fprintf(stderr, "Can't open %s\n", s);
793 debug = 0;
794 return;
795 }
796 }
797#ifdef O_APPEND
Denis Vlasenkod37f2222007-08-19 13:42:08 +0000798 flags = fcntl(fileno(tracefile), F_GETFL);
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000799 if (flags >= 0)
800 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
801#endif
802 setlinebuf(tracefile);
803 fputs("\nTracing started.\n", tracefile);
804}
805
806static void
807indent(int amount, char *pfx, FILE *fp)
808{
809 int i;
810
811 for (i = 0; i < amount; i++) {
812 if (pfx && i == amount - 1)
813 fputs(pfx, fp);
814 putc('\t', fp);
815 }
816}
817
818/* little circular references here... */
819static void shtree(union node *n, int ind, char *pfx, FILE *fp);
820
821static void
822sharg(union node *arg, FILE *fp)
823{
824 char *p;
825 struct nodelist *bqlist;
826 int subtype;
827
828 if (arg->type != NARG) {
829 out1fmt("<node type %d>\n", arg->type);
830 abort();
831 }
832 bqlist = arg->narg.backquote;
833 for (p = arg->narg.text; *p; p++) {
834 switch (*p) {
835 case CTLESC:
836 putc(*++p, fp);
837 break;
838 case CTLVAR:
839 putc('$', fp);
840 putc('{', fp);
841 subtype = *++p;
842 if (subtype == VSLENGTH)
843 putc('#', fp);
844
845 while (*p != '=')
846 putc(*p++, fp);
847
848 if (subtype & VSNUL)
849 putc(':', fp);
850
851 switch (subtype & VSTYPE) {
852 case VSNORMAL:
853 putc('}', fp);
854 break;
855 case VSMINUS:
856 putc('-', fp);
857 break;
858 case VSPLUS:
859 putc('+', fp);
860 break;
861 case VSQUESTION:
862 putc('?', fp);
863 break;
864 case VSASSIGN:
865 putc('=', fp);
866 break;
867 case VSTRIMLEFT:
868 putc('#', fp);
869 break;
870 case VSTRIMLEFTMAX:
871 putc('#', fp);
872 putc('#', fp);
873 break;
874 case VSTRIMRIGHT:
875 putc('%', fp);
876 break;
877 case VSTRIMRIGHTMAX:
878 putc('%', fp);
879 putc('%', fp);
880 break;
881 case VSLENGTH:
882 break;
883 default:
884 out1fmt("<subtype %d>", subtype);
885 }
886 break;
887 case CTLENDVAR:
888 putc('}', fp);
889 break;
890 case CTLBACKQ:
891 case CTLBACKQ|CTLQUOTE:
892 putc('$', fp);
893 putc('(', fp);
894 shtree(bqlist->n, -1, NULL, fp);
895 putc(')', fp);
896 break;
897 default:
898 putc(*p, fp);
899 break;
900 }
901 }
902}
903
Denys Vlasenko641dd7b2009-06-11 19:30:19 +0200904static void
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000905shcmd(union node *cmd, FILE *fp)
906{
907 union node *np;
908 int first;
909 const char *s;
910 int dftfd;
911
912 first = 1;
913 for (np = cmd->ncmd.args; np; np = np->narg.next) {
Denis Vlasenko40ba9982007-07-14 00:48:29 +0000914 if (!first)
915 putc(' ', fp);
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000916 sharg(np, fp);
917 first = 0;
918 }
919 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
Denis Vlasenko40ba9982007-07-14 00:48:29 +0000920 if (!first)
921 putc(' ', fp);
922 dftfd = 0;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000923 switch (np->nfile.type) {
Denis Vlasenko40ba9982007-07-14 00:48:29 +0000924 case NTO: s = ">>"+1; dftfd = 1; break;
925 case NCLOBBER: s = ">|"; dftfd = 1; break;
926 case NAPPEND: s = ">>"; dftfd = 1; break;
Denis Vlasenko559691a2008-10-05 18:39:31 +0000927#if ENABLE_ASH_BASH_COMPAT
928 case NTO2:
929#endif
Denis Vlasenko40ba9982007-07-14 00:48:29 +0000930 case NTOFD: s = ">&"; dftfd = 1; break;
Denis Vlasenko559691a2008-10-05 18:39:31 +0000931 case NFROM: s = "<"; break;
Denis Vlasenko40ba9982007-07-14 00:48:29 +0000932 case NFROMFD: s = "<&"; break;
933 case NFROMTO: s = "<>"; break;
934 default: s = "*error*"; break;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000935 }
936 if (np->nfile.fd != dftfd)
937 fprintf(fp, "%d", np->nfile.fd);
938 fputs(s, fp);
939 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
940 fprintf(fp, "%d", np->ndup.dupfd);
941 } else {
942 sharg(np->nfile.fname, fp);
943 }
944 first = 0;
945 }
946}
947
948static void
949shtree(union node *n, int ind, char *pfx, FILE *fp)
950{
951 struct nodelist *lp;
952 const char *s;
953
954 if (n == NULL)
955 return;
956
957 indent(ind, pfx, fp);
Denys Vlasenko86e83ec2009-07-23 22:07:07 +0200958
959 if (n == NODE_EOF) {
960 fputs("<EOF>", fp);
961 return;
962 }
963
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000964 switch (n->type) {
965 case NSEMI:
966 s = "; ";
967 goto binop;
968 case NAND:
969 s = " && ";
970 goto binop;
971 case NOR:
972 s = " || ";
973 binop:
974 shtree(n->nbinary.ch1, ind, NULL, fp);
975 /* if (ind < 0) */
976 fputs(s, fp);
977 shtree(n->nbinary.ch2, ind, NULL, fp);
978 break;
979 case NCMD:
980 shcmd(n, fp);
981 if (ind >= 0)
982 putc('\n', fp);
983 break;
984 case NPIPE:
985 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
Denys Vlasenko7cee00e2009-07-24 01:08:03 +0200986 shtree(lp->n, 0, NULL, fp);
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000987 if (lp->next)
988 fputs(" | ", fp);
989 }
Denis Vlasenko2dc240c2008-07-24 06:07:50 +0000990 if (n->npipe.pipe_backgnd)
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +0000991 fputs(" &", fp);
992 if (ind >= 0)
993 putc('\n', fp);
994 break;
995 default:
996 fprintf(fp, "<node type %d>", n->type);
997 if (ind >= 0)
998 putc('\n', fp);
999 break;
1000 }
1001}
1002
1003static void
1004showtree(union node *n)
1005{
1006 trace_puts("showtree called\n");
Denys Vlasenko883cea42009-07-11 15:31:59 +02001007 shtree(n, 1, NULL, stderr);
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00001008}
1009
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00001010#endif /* DEBUG */
1011
1012
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00001013/* ============ Parser data */
1014
1015/*
Denis Vlasenkob012b102007-02-19 22:43:01 +00001016 * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up.
1017 */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001018struct strlist {
1019 struct strlist *next;
1020 char *text;
1021};
1022
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00001023struct alias;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00001024
Denis Vlasenkob012b102007-02-19 22:43:01 +00001025struct strpush {
1026 struct strpush *prev; /* preceding string on stack */
Denis Vlasenko41eb3002008-11-28 03:42:31 +00001027 char *prev_string;
1028 int prev_left_in_line;
Denis Vlasenkob012b102007-02-19 22:43:01 +00001029#if ENABLE_ASH_ALIAS
1030 struct alias *ap; /* if push was associated with an alias */
1031#endif
1032 char *string; /* remember the string since it may change */
1033};
1034
1035struct parsefile {
1036 struct parsefile *prev; /* preceding file on stack */
1037 int linno; /* current line */
1038 int fd; /* file descriptor (or -1 if string) */
Denis Vlasenko41eb3002008-11-28 03:42:31 +00001039 int left_in_line; /* number of chars left in this line */
1040 int left_in_buffer; /* number of chars left in this buffer past the line */
1041 char *next_to_pgetc; /* next char in buffer */
Denis Vlasenkob012b102007-02-19 22:43:01 +00001042 char *buf; /* input buffer */
1043 struct strpush *strpush; /* for pushing strings at this level */
1044 struct strpush basestrpush; /* so pushing one is fast */
1045};
1046
Denis Vlasenko448d30e2008-06-27 00:24:11 +00001047static struct parsefile basepf; /* top level input file */
Denis Vlasenkob07a4962008-06-22 13:16:23 +00001048static struct parsefile *g_parsefile = &basepf; /* current input file */
Denis Vlasenkob012b102007-02-19 22:43:01 +00001049static int startlinno; /* line # where last token started */
1050static char *commandname; /* currently executing command */
1051static struct strlist *cmdenviron; /* environment for builtin command */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00001052static uint8_t exitstatus; /* exit status of last command */
Denis Vlasenkob012b102007-02-19 22:43:01 +00001053
1054
1055/* ============ Message printing */
1056
1057static void
1058ash_vmsg(const char *msg, va_list ap)
1059{
1060 fprintf(stderr, "%s: ", arg0);
1061 if (commandname) {
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +00001062 if (strcmp(arg0, commandname))
1063 fprintf(stderr, "%s: ", commandname);
Denis Vlasenkob07a4962008-06-22 13:16:23 +00001064 if (!iflag || g_parsefile->fd)
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +00001065 fprintf(stderr, "line %d: ", startlinno);
Eric Andersenc470f442003-07-28 09:56:35 +00001066 }
Denis Vlasenkob012b102007-02-19 22:43:01 +00001067 vfprintf(stderr, msg, ap);
1068 outcslow('\n', stderr);
Eric Andersenc470f442003-07-28 09:56:35 +00001069}
Denis Vlasenkob012b102007-02-19 22:43:01 +00001070
1071/*
1072 * Exverror is called to raise the error exception. If the second argument
1073 * is not NULL then error prints an error message using printf style
1074 * formatting. It then raises the error exception.
1075 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001076static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN;
Denis Vlasenkob012b102007-02-19 22:43:01 +00001077static void
1078ash_vmsg_and_raise(int cond, const char *msg, va_list ap)
Eric Andersenc470f442003-07-28 09:56:35 +00001079{
Denis Vlasenkob012b102007-02-19 22:43:01 +00001080#if DEBUG
1081 if (msg) {
1082 TRACE(("ash_vmsg_and_raise(%d, \"", cond));
1083 TRACEV((msg, ap));
1084 TRACE(("\") pid=%d\n", getpid()));
1085 } else
1086 TRACE(("ash_vmsg_and_raise(%d, NULL) pid=%d\n", cond, getpid()));
1087 if (msg)
1088#endif
1089 ash_vmsg(msg, ap);
1090
1091 flush_stdout_stderr();
1092 raise_exception(cond);
1093 /* NOTREACHED */
Eric Andersenc470f442003-07-28 09:56:35 +00001094}
Denis Vlasenkob012b102007-02-19 22:43:01 +00001095
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001096static void ash_msg_and_raise_error(const char *, ...) NORETURN;
Denis Vlasenkob012b102007-02-19 22:43:01 +00001097static void
1098ash_msg_and_raise_error(const char *msg, ...)
1099{
1100 va_list ap;
1101
1102 va_start(ap, msg);
1103 ash_vmsg_and_raise(EXERROR, msg, ap);
1104 /* NOTREACHED */
1105 va_end(ap);
1106}
1107
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001108static void raise_error_syntax(const char *) NORETURN;
1109static void
1110raise_error_syntax(const char *msg)
1111{
1112 ash_msg_and_raise_error("syntax error: %s", msg);
1113 /* NOTREACHED */
1114}
1115
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00001116static void ash_msg_and_raise(int, const char *, ...) NORETURN;
Denis Vlasenkob012b102007-02-19 22:43:01 +00001117static void
1118ash_msg_and_raise(int cond, const char *msg, ...)
1119{
1120 va_list ap;
1121
1122 va_start(ap, msg);
1123 ash_vmsg_and_raise(cond, msg, ap);
1124 /* NOTREACHED */
1125 va_end(ap);
1126}
1127
1128/*
1129 * error/warning routines for external builtins
1130 */
1131static void
1132ash_msg(const char *fmt, ...)
1133{
1134 va_list ap;
1135
1136 va_start(ap, fmt);
1137 ash_vmsg(fmt, ap);
1138 va_end(ap);
1139}
1140
1141/*
1142 * Return a string describing an error. The returned string may be a
1143 * pointer to a static buffer that will be overwritten on the next call.
1144 * Action describes the operation that got the error.
1145 */
1146static const char *
1147errmsg(int e, const char *em)
1148{
1149 if (e == ENOENT || e == ENOTDIR) {
1150 return em;
1151 }
1152 return strerror(e);
1153}
1154
1155
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001156/* ============ Memory allocation */
1157
1158/*
1159 * It appears that grabstackstr() will barf with such alignments
1160 * because stalloc() will return a string allocated in a new stackblock.
1161 */
1162#define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
1163enum {
1164 /* Most machines require the value returned from malloc to be aligned
1165 * in some way. The following macro will get this right
1166 * on many machines. */
1167 SHELL_SIZE = sizeof(union {int i; char *cp; double d; }) - 1,
1168 /* Minimum size of a block */
Denis Vlasenko01631112007-12-16 17:20:38 +00001169 MINSIZE = SHELL_ALIGN(504),
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001170};
1171
1172struct stack_block {
1173 struct stack_block *prev;
1174 char space[MINSIZE];
1175};
1176
1177struct stackmark {
1178 struct stack_block *stackp;
1179 char *stacknxt;
1180 size_t stacknleft;
1181 struct stackmark *marknext;
1182};
1183
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001184
Denis Vlasenko01631112007-12-16 17:20:38 +00001185struct globals_memstack {
1186 struct stack_block *g_stackp; // = &stackbase;
1187 struct stackmark *markp;
1188 char *g_stacknxt; // = stackbase.space;
1189 char *sstrend; // = stackbase.space + MINSIZE;
1190 size_t g_stacknleft; // = MINSIZE;
1191 int herefd; // = -1;
1192 struct stack_block stackbase;
1193};
Denis Vlasenko574f2f42008-02-27 18:41:59 +00001194extern struct globals_memstack *const ash_ptr_to_globals_memstack;
1195#define G_memstack (*ash_ptr_to_globals_memstack)
Denis Vlasenko01631112007-12-16 17:20:38 +00001196#define g_stackp (G_memstack.g_stackp )
1197#define markp (G_memstack.markp )
1198#define g_stacknxt (G_memstack.g_stacknxt )
1199#define sstrend (G_memstack.sstrend )
1200#define g_stacknleft (G_memstack.g_stacknleft)
1201#define herefd (G_memstack.herefd )
1202#define stackbase (G_memstack.stackbase )
1203#define INIT_G_memstack() do { \
Denis Vlasenko574f2f42008-02-27 18:41:59 +00001204 (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \
1205 barrier(); \
Denis Vlasenko01631112007-12-16 17:20:38 +00001206 g_stackp = &stackbase; \
1207 g_stacknxt = stackbase.space; \
1208 g_stacknleft = MINSIZE; \
1209 sstrend = stackbase.space + MINSIZE; \
1210 herefd = -1; \
1211} while (0)
1212
1213#define stackblock() ((void *)g_stacknxt)
1214#define stackblocksize() g_stacknleft
1215
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001216
1217static void *
1218ckrealloc(void * p, size_t nbytes)
1219{
1220 p = realloc(p, nbytes);
1221 if (!p)
1222 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1223 return p;
1224}
1225
1226static void *
1227ckmalloc(size_t nbytes)
1228{
1229 return ckrealloc(NULL, nbytes);
1230}
1231
Denis Vlasenko597906c2008-02-20 16:38:54 +00001232static void *
1233ckzalloc(size_t nbytes)
1234{
1235 return memset(ckmalloc(nbytes), 0, nbytes);
1236}
1237
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001238/*
1239 * Make a copy of a string in safe storage.
1240 */
1241static char *
1242ckstrdup(const char *s)
1243{
1244 char *p = strdup(s);
1245 if (!p)
1246 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1247 return p;
1248}
1249
1250/*
1251 * Parse trees for commands are allocated in lifo order, so we use a stack
1252 * to make this more efficient, and also to avoid all sorts of exception
1253 * handling code to handle interrupts in the middle of a parse.
1254 *
1255 * The size 504 was chosen because the Ultrix malloc handles that size
1256 * well.
1257 */
1258static void *
1259stalloc(size_t nbytes)
1260{
1261 char *p;
1262 size_t aligned;
1263
1264 aligned = SHELL_ALIGN(nbytes);
Denis Vlasenko01631112007-12-16 17:20:38 +00001265 if (aligned > g_stacknleft) {
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001266 size_t len;
1267 size_t blocksize;
1268 struct stack_block *sp;
1269
1270 blocksize = aligned;
1271 if (blocksize < MINSIZE)
1272 blocksize = MINSIZE;
1273 len = sizeof(struct stack_block) - MINSIZE + blocksize;
1274 if (len < blocksize)
1275 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1276 INT_OFF;
1277 sp = ckmalloc(len);
Denis Vlasenko01631112007-12-16 17:20:38 +00001278 sp->prev = g_stackp;
1279 g_stacknxt = sp->space;
1280 g_stacknleft = blocksize;
1281 sstrend = g_stacknxt + blocksize;
1282 g_stackp = sp;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001283 INT_ON;
1284 }
Denis Vlasenko01631112007-12-16 17:20:38 +00001285 p = g_stacknxt;
1286 g_stacknxt += aligned;
1287 g_stacknleft -= aligned;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001288 return p;
1289}
1290
Denis Vlasenko597906c2008-02-20 16:38:54 +00001291static void *
1292stzalloc(size_t nbytes)
1293{
1294 return memset(stalloc(nbytes), 0, nbytes);
1295}
1296
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001297static void
1298stunalloc(void *p)
1299{
1300#if DEBUG
Denis Vlasenko01631112007-12-16 17:20:38 +00001301 if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) {
Bernhard Reutner-Fischer5e25ddb2008-05-19 09:48:17 +00001302 write(STDERR_FILENO, "stunalloc\n", 10);
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001303 abort();
1304 }
1305#endif
Denis Vlasenko01631112007-12-16 17:20:38 +00001306 g_stacknleft += g_stacknxt - (char *)p;
1307 g_stacknxt = p;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001308}
1309
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001310/*
1311 * Like strdup but works with the ash stack.
1312 */
1313static char *
1314ststrdup(const char *p)
1315{
1316 size_t len = strlen(p) + 1;
1317 return memcpy(stalloc(len), p, len);
1318}
1319
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001320static void
1321setstackmark(struct stackmark *mark)
1322{
Denis Vlasenko01631112007-12-16 17:20:38 +00001323 mark->stackp = g_stackp;
1324 mark->stacknxt = g_stacknxt;
1325 mark->stacknleft = g_stacknleft;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001326 mark->marknext = markp;
1327 markp = mark;
1328}
1329
1330static void
1331popstackmark(struct stackmark *mark)
1332{
1333 struct stack_block *sp;
1334
Denis Vlasenko93ebd4f2007-03-13 20:55:36 +00001335 if (!mark->stackp)
1336 return;
1337
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001338 INT_OFF;
1339 markp = mark->marknext;
Denis Vlasenko01631112007-12-16 17:20:38 +00001340 while (g_stackp != mark->stackp) {
1341 sp = g_stackp;
1342 g_stackp = sp->prev;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001343 free(sp);
1344 }
Denis Vlasenko01631112007-12-16 17:20:38 +00001345 g_stacknxt = mark->stacknxt;
1346 g_stacknleft = mark->stacknleft;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001347 sstrend = mark->stacknxt + mark->stacknleft;
1348 INT_ON;
1349}
1350
1351/*
1352 * When the parser reads in a string, it wants to stick the string on the
1353 * stack and only adjust the stack pointer when it knows how big the
1354 * string is. Stackblock (defined in stack.h) returns a pointer to a block
1355 * of space on top of the stack and stackblocklen returns the length of
1356 * this block. Growstackblock will grow this space by at least one byte,
1357 * possibly moving it (like realloc). Grabstackblock actually allocates the
1358 * part of the block that has been used.
1359 */
1360static void
1361growstackblock(void)
1362{
1363 size_t newlen;
1364
Denis Vlasenko01631112007-12-16 17:20:38 +00001365 newlen = g_stacknleft * 2;
1366 if (newlen < g_stacknleft)
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001367 ash_msg_and_raise_error(bb_msg_memory_exhausted);
1368 if (newlen < 128)
1369 newlen += 128;
1370
Denis Vlasenko01631112007-12-16 17:20:38 +00001371 if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) {
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001372 struct stack_block *oldstackp;
1373 struct stackmark *xmark;
1374 struct stack_block *sp;
1375 struct stack_block *prevstackp;
1376 size_t grosslen;
1377
1378 INT_OFF;
Denis Vlasenko01631112007-12-16 17:20:38 +00001379 oldstackp = g_stackp;
1380 sp = g_stackp;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001381 prevstackp = sp->prev;
1382 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
1383 sp = ckrealloc(sp, grosslen);
1384 sp->prev = prevstackp;
Denis Vlasenko01631112007-12-16 17:20:38 +00001385 g_stackp = sp;
1386 g_stacknxt = sp->space;
1387 g_stacknleft = newlen;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001388 sstrend = sp->space + newlen;
1389
1390 /*
1391 * Stack marks pointing to the start of the old block
1392 * must be relocated to point to the new block
1393 */
1394 xmark = markp;
1395 while (xmark != NULL && xmark->stackp == oldstackp) {
Denis Vlasenko01631112007-12-16 17:20:38 +00001396 xmark->stackp = g_stackp;
1397 xmark->stacknxt = g_stacknxt;
1398 xmark->stacknleft = g_stacknleft;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001399 xmark = xmark->marknext;
1400 }
1401 INT_ON;
1402 } else {
Denis Vlasenko01631112007-12-16 17:20:38 +00001403 char *oldspace = g_stacknxt;
Denis Vlasenko29eb3592008-05-18 14:06:08 +00001404 size_t oldlen = g_stacknleft;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001405 char *p = stalloc(newlen);
1406
1407 /* free the space we just allocated */
Denis Vlasenko01631112007-12-16 17:20:38 +00001408 g_stacknxt = memcpy(p, oldspace, oldlen);
1409 g_stacknleft += newlen;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001410 }
1411}
1412
1413static void
1414grabstackblock(size_t len)
1415{
1416 len = SHELL_ALIGN(len);
Denis Vlasenko01631112007-12-16 17:20:38 +00001417 g_stacknxt += len;
1418 g_stacknleft -= len;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001419}
1420
1421/*
1422 * The following routines are somewhat easier to use than the above.
1423 * The user declares a variable of type STACKSTR, which may be declared
1424 * to be a register. The macro STARTSTACKSTR initializes things. Then
1425 * the user uses the macro STPUTC to add characters to the string. In
1426 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
1427 * grown as necessary. When the user is done, she can just leave the
1428 * string there and refer to it using stackblock(). Or she can allocate
1429 * the space for it using grabstackstr(). If it is necessary to allow
1430 * someone else to use the stack temporarily and then continue to grow
1431 * the string, the user should use grabstack to allocate the space, and
1432 * then call ungrabstr(p) to return to the previous mode of operation.
1433 *
1434 * USTPUTC is like STPUTC except that it doesn't check for overflow.
1435 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
1436 * is space for at least one character.
1437 */
1438static void *
1439growstackstr(void)
1440{
1441 size_t len = stackblocksize();
1442 if (herefd >= 0 && len >= 1024) {
1443 full_write(herefd, stackblock(), len);
1444 return stackblock();
1445 }
1446 growstackblock();
Denis Vlasenko29eb3592008-05-18 14:06:08 +00001447 return (char *)stackblock() + len;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001448}
1449
1450/*
1451 * Called from CHECKSTRSPACE.
1452 */
1453static char *
1454makestrspace(size_t newlen, char *p)
1455{
Denis Vlasenko01631112007-12-16 17:20:38 +00001456 size_t len = p - g_stacknxt;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001457 size_t size = stackblocksize();
1458
1459 for (;;) {
1460 size_t nleft;
1461
1462 size = stackblocksize();
1463 nleft = size - len;
1464 if (nleft >= newlen)
1465 break;
1466 growstackblock();
1467 }
Denis Vlasenko29eb3592008-05-18 14:06:08 +00001468 return (char *)stackblock() + len;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001469}
1470
1471static char *
1472stack_nputstr(const char *s, size_t n, char *p)
1473{
1474 p = makestrspace(n, p);
Denis Vlasenko29eb3592008-05-18 14:06:08 +00001475 p = (char *)memcpy(p, s, n) + n;
Denis Vlasenko0c032a42007-02-23 01:03:40 +00001476 return p;
1477}
1478
1479static char *
1480stack_putstr(const char *s, char *p)
1481{
1482 return stack_nputstr(s, strlen(s), p);
1483}
1484
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001485static char *
1486_STPUTC(int c, char *p)
1487{
1488 if (p == sstrend)
1489 p = growstackstr();
1490 *p++ = c;
1491 return p;
1492}
1493
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00001494#define STARTSTACKSTR(p) ((p) = stackblock())
1495#define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
Denis Vlasenko843cbd52008-06-27 00:23:18 +00001496#define CHECKSTRSPACE(n, p) do { \
1497 char *q = (p); \
1498 size_t l = (n); \
1499 size_t m = sstrend - q; \
1500 if (l > m) \
1501 (p) = makestrspace(l, q); \
1502} while (0)
Denis Vlasenkoef527f52008-06-23 01:52:30 +00001503#define USTPUTC(c, p) (*(p)++ = (c))
Denis Vlasenko843cbd52008-06-27 00:23:18 +00001504#define STACKSTRNUL(p) do { \
1505 if ((p) == sstrend) \
1506 (p) = growstackstr(); \
1507 *(p) = '\0'; \
1508} while (0)
Denis Vlasenkoef527f52008-06-23 01:52:30 +00001509#define STUNPUTC(p) (--(p))
1510#define STTOPC(p) ((p)[-1])
1511#define STADJUST(amount, p) ((p) += (amount))
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001512
1513#define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
Denis Vlasenkoef527f52008-06-23 01:52:30 +00001514#define ungrabstackstr(s, p) stunalloc(s)
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001515#define stackstrend() ((void *)sstrend)
1516
1517
1518/* ============ String helpers */
1519
1520/*
1521 * prefix -- see if pfx is a prefix of string.
1522 */
1523static char *
1524prefix(const char *string, const char *pfx)
1525{
1526 while (*pfx) {
1527 if (*pfx++ != *string++)
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00001528 return NULL;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001529 }
1530 return (char *) string;
1531}
1532
1533/*
1534 * Check for a valid number. This should be elsewhere.
1535 */
1536static int
1537is_number(const char *p)
1538{
1539 do {
1540 if (!isdigit(*p))
1541 return 0;
1542 } while (*++p != '\0');
1543 return 1;
1544}
1545
1546/*
1547 * Convert a string of digits to an integer, printing an error message on
1548 * failure.
1549 */
1550static int
1551number(const char *s)
1552{
1553 if (!is_number(s))
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02001554 ash_msg_and_raise_error(msg_illnum, s);
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001555 return atoi(s);
1556}
1557
1558/*
1559 * Produce a possibly single quoted string suitable as input to the shell.
1560 * The return string is allocated on the stack.
1561 */
1562static char *
1563single_quote(const char *s)
1564{
1565 char *p;
1566
1567 STARTSTACKSTR(p);
1568
1569 do {
1570 char *q;
1571 size_t len;
1572
1573 len = strchrnul(s, '\'') - s;
1574
1575 q = p = makestrspace(len + 3, p);
1576
1577 *q++ = '\'';
Denis Vlasenko29eb3592008-05-18 14:06:08 +00001578 q = (char *)memcpy(q, s, len) + len;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001579 *q++ = '\'';
1580 s += len;
1581
1582 STADJUST(q - p, p);
1583
1584 len = strspn(s, "'");
1585 if (!len)
1586 break;
1587
1588 q = p = makestrspace(len + 3, p);
1589
1590 *q++ = '"';
Denis Vlasenko29eb3592008-05-18 14:06:08 +00001591 q = (char *)memcpy(q, s, len) + len;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001592 *q++ = '"';
1593 s += len;
1594
1595 STADJUST(q - p, p);
1596 } while (*s);
1597
1598 USTPUTC(0, p);
1599
1600 return stackblock();
1601}
1602
1603
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00001604/* ============ nextopt */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001605
1606static char **argptr; /* argument list for builtin commands */
1607static char *optionarg; /* set by nextopt (like getopt) */
1608static char *optptr; /* used by nextopt */
1609
1610/*
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001611 * XXX - should get rid of. Have all builtins use getopt(3).
1612 * The library getopt must have the BSD extension static variable
1613 * "optreset", otherwise it can't be used within the shell safely.
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001614 *
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001615 * Standard option processing (a la getopt) for builtin routines.
1616 * The only argument that is passed to nextopt is the option string;
1617 * the other arguments are unnecessary. It returns the character,
1618 * or '\0' on end of input.
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001619 */
1620static int
1621nextopt(const char *optstring)
1622{
1623 char *p;
1624 const char *q;
1625 char c;
1626
1627 p = optptr;
1628 if (p == NULL || *p == '\0') {
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001629 /* We ate entire "-param", take next one */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001630 p = *argptr;
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001631 if (p == NULL)
1632 return '\0';
1633 if (*p != '-')
1634 return '\0';
1635 if (*++p == '\0') /* just "-" ? */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001636 return '\0';
1637 argptr++;
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001638 if (LONE_DASH(p)) /* "--" ? */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001639 return '\0';
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001640 /* p => next "-param" */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001641 }
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001642 /* p => some option char in the middle of a "-param" */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001643 c = *p++;
Denis Vlasenko2f5d0cd2008-06-23 13:24:19 +00001644 for (q = optstring; *q != c;) {
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001645 if (*q == '\0')
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +00001646 ash_msg_and_raise_error("illegal option -%c", c);
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001647 if (*++q == ':')
1648 q++;
1649 }
1650 if (*++q == ':') {
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00001651 if (*p == '\0') {
1652 p = *argptr++;
1653 if (p == NULL)
1654 ash_msg_and_raise_error("no arg for -%c option", c);
1655 }
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001656 optionarg = p;
1657 p = NULL;
1658 }
1659 optptr = p;
1660 return c;
1661}
1662
1663
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00001664/* ============ Shell variables */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001665
Denis Vlasenko01631112007-12-16 17:20:38 +00001666/*
1667 * The parsefile structure pointed to by the global variable parsefile
1668 * contains information about the current file being read.
1669 */
Denis Vlasenko01631112007-12-16 17:20:38 +00001670struct shparam {
1671 int nparam; /* # of positional parameters (without $0) */
1672#if ENABLE_ASH_GETOPTS
1673 int optind; /* next parameter to be processed by getopts */
1674 int optoff; /* used by getopts */
1675#endif
1676 unsigned char malloced; /* if parameter list dynamically allocated */
1677 char **p; /* parameter list */
1678};
1679
1680/*
1681 * Free the list of positional parameters.
1682 */
1683static void
1684freeparam(volatile struct shparam *param)
1685{
Denis Vlasenko01631112007-12-16 17:20:38 +00001686 if (param->malloced) {
Denis Vlasenko3177ba02008-07-13 20:39:23 +00001687 char **ap, **ap1;
1688 ap = ap1 = param->p;
1689 while (*ap)
1690 free(*ap++);
1691 free(ap1);
Denis Vlasenko01631112007-12-16 17:20:38 +00001692 }
1693}
1694
1695#if ENABLE_ASH_GETOPTS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001696static void FAST_FUNC getoptsreset(const char *value);
Denis Vlasenko01631112007-12-16 17:20:38 +00001697#endif
1698
1699struct var {
1700 struct var *next; /* next entry in hash list */
1701 int flags; /* flags are defined above */
1702 const char *text; /* name=value */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001703 void (*func)(const char *) FAST_FUNC; /* function to be called when */
Denis Vlasenko01631112007-12-16 17:20:38 +00001704 /* the variable gets set/unset */
1705};
1706
1707struct localvar {
1708 struct localvar *next; /* next local variable in list */
1709 struct var *vp; /* the variable that was made local */
1710 int flags; /* saved flags */
1711 const char *text; /* saved text */
1712};
1713
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001714/* flags */
1715#define VEXPORT 0x01 /* variable is exported */
1716#define VREADONLY 0x02 /* variable cannot be modified */
1717#define VSTRFIXED 0x04 /* variable struct is statically allocated */
1718#define VTEXTFIXED 0x08 /* text is statically allocated */
1719#define VSTACK 0x10 /* text is allocated on the stack */
1720#define VUNSET 0x20 /* the variable is not set */
1721#define VNOFUNC 0x40 /* don't call the callback function */
1722#define VNOSET 0x80 /* do not set variable - just readonly test */
1723#define VNOSAVE 0x100 /* when text is on the heap before setvareq */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00001724#if ENABLE_ASH_RANDOM_SUPPORT
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00001725# define VDYNAMIC 0x200 /* dynamic variable */
1726#else
1727# define VDYNAMIC 0
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001728#endif
1729
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001730#ifdef IFS_BROKEN
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00001731static const char defifsvar[] ALIGN1 = "IFS= \t\n";
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001732#define defifs (defifsvar + 4)
1733#else
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00001734static const char defifs[] ALIGN1 = " \t\n";
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001735#endif
1736
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00001737
Denis Vlasenko01631112007-12-16 17:20:38 +00001738/* Need to be before varinit_data[] */
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00001739#if ENABLE_LOCALE_SUPPORT
Denys Vlasenko2634bf32009-06-09 18:40:07 +02001740static void FAST_FUNC
Denis Vlasenkoa8915072007-02-23 21:10:06 +00001741change_lc_all(const char *value)
1742{
1743 if (value && *value != '\0')
1744 setlocale(LC_ALL, value);
1745}
Denys Vlasenko2634bf32009-06-09 18:40:07 +02001746static void FAST_FUNC
Denis Vlasenkoa8915072007-02-23 21:10:06 +00001747change_lc_ctype(const char *value)
1748{
1749 if (value && *value != '\0')
1750 setlocale(LC_CTYPE, value);
1751}
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00001752#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001753#if ENABLE_ASH_MAIL
1754static void chkmail(void);
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001755static void changemail(const char *) FAST_FUNC;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001756#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001757static void changepath(const char *) FAST_FUNC;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001758#if ENABLE_ASH_RANDOM_SUPPORT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001759static void change_random(const char *) FAST_FUNC;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001760#endif
1761
Denis Vlasenko01631112007-12-16 17:20:38 +00001762static const struct {
1763 int flags;
1764 const char *text;
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001765 void (*func)(const char *) FAST_FUNC;
Denis Vlasenko01631112007-12-16 17:20:38 +00001766} varinit_data[] = {
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001767#ifdef IFS_BROKEN
Denis Vlasenko01631112007-12-16 17:20:38 +00001768 { VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001769#else
Denis Vlasenko01631112007-12-16 17:20:38 +00001770 { VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0" , NULL },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001771#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001772#if ENABLE_ASH_MAIL
Denis Vlasenko01631112007-12-16 17:20:38 +00001773 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0" , changemail },
1774 { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001775#endif
Denis Vlasenko01631112007-12-16 17:20:38 +00001776 { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath },
1777 { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL },
1778 { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL },
1779 { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001780#if ENABLE_ASH_GETOPTS
Denis Vlasenko01631112007-12-16 17:20:38 +00001781 { VSTRFIXED|VTEXTFIXED , "OPTIND=1" , getoptsreset },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001782#endif
1783#if ENABLE_ASH_RANDOM_SUPPORT
Denis Vlasenko01631112007-12-16 17:20:38 +00001784 { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001785#endif
1786#if ENABLE_LOCALE_SUPPORT
Denis Vlasenko01631112007-12-16 17:20:38 +00001787 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL\0" , change_lc_all },
1788 { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE\0", change_lc_ctype },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001789#endif
1790#if ENABLE_FEATURE_EDITING_SAVEHISTORY
Denis Vlasenko01631112007-12-16 17:20:38 +00001791 { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE\0", NULL },
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001792#endif
1793};
1794
Denis Vlasenko0b769642008-07-24 07:54:57 +00001795struct redirtab;
Denis Vlasenko01631112007-12-16 17:20:38 +00001796
1797struct globals_var {
1798 struct shparam shellparam; /* $@ current positional parameters */
1799 struct redirtab *redirlist;
1800 int g_nullredirs;
1801 int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1802 struct var *vartab[VTABSIZE];
1803 struct var varinit[ARRAY_SIZE(varinit_data)];
1804};
Denis Vlasenko574f2f42008-02-27 18:41:59 +00001805extern struct globals_var *const ash_ptr_to_globals_var;
1806#define G_var (*ash_ptr_to_globals_var)
Denis Vlasenko01631112007-12-16 17:20:38 +00001807#define shellparam (G_var.shellparam )
Denis Vlasenko0b769642008-07-24 07:54:57 +00001808//#define redirlist (G_var.redirlist )
Denis Vlasenko01631112007-12-16 17:20:38 +00001809#define g_nullredirs (G_var.g_nullredirs )
1810#define preverrout_fd (G_var.preverrout_fd)
1811#define vartab (G_var.vartab )
1812#define varinit (G_var.varinit )
1813#define INIT_G_var() do { \
Denis Vlasenko6b06cb82008-05-15 21:30:45 +00001814 unsigned i; \
Denis Vlasenko574f2f42008-02-27 18:41:59 +00001815 (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \
1816 barrier(); \
Denis Vlasenko01631112007-12-16 17:20:38 +00001817 for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \
1818 varinit[i].flags = varinit_data[i].flags; \
1819 varinit[i].text = varinit_data[i].text; \
1820 varinit[i].func = varinit_data[i].func; \
1821 } \
1822} while (0)
1823
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001824#define vifs varinit[0]
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001825#if ENABLE_ASH_MAIL
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001826# define vmail (&vifs)[1]
1827# define vmpath (&vmail)[1]
1828# define vpath (&vmpath)[1]
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001829#else
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001830# define vpath (&vifs)[1]
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001831#endif
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001832#define vps1 (&vpath)[1]
1833#define vps2 (&vps1)[1]
1834#define vps4 (&vps2)[1]
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001835#if ENABLE_ASH_GETOPTS
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001836# define voptind (&vps4)[1]
1837# if ENABLE_ASH_RANDOM_SUPPORT
1838# define vrandom (&voptind)[1]
1839# endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001840#else
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001841# if ENABLE_ASH_RANDOM_SUPPORT
1842# define vrandom (&vps4)[1]
1843# endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001844#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001845
1846/*
1847 * The following macros access the values of the above variables.
1848 * They have to skip over the name. They return the null string
1849 * for unset variables.
1850 */
1851#define ifsval() (vifs.text + 4)
1852#define ifsset() ((vifs.flags & VUNSET) == 0)
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001853#if ENABLE_ASH_MAIL
1854# define mailval() (vmail.text + 5)
1855# define mpathval() (vmpath.text + 9)
1856# define mpathset() ((vmpath.flags & VUNSET) == 0)
1857#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001858#define pathval() (vpath.text + 5)
1859#define ps1val() (vps1.text + 4)
1860#define ps2val() (vps2.text + 4)
1861#define ps4val() (vps4.text + 4)
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00001862#if ENABLE_ASH_GETOPTS
1863# define optindval() (voptind.text + 7)
1864#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001865
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001866
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001867#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
1868#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
1869
Denis Vlasenko01631112007-12-16 17:20:38 +00001870#if ENABLE_ASH_GETOPTS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02001871static void FAST_FUNC
Denis Vlasenko01631112007-12-16 17:20:38 +00001872getoptsreset(const char *value)
1873{
1874 shellparam.optind = number(value);
1875 shellparam.optoff = -1;
1876}
1877#endif
1878
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001879/*
1880 * Return of a legal variable name (a letter or underscore followed by zero or
1881 * more letters, underscores, and digits).
1882 */
1883static char *
1884endofname(const char *name)
1885{
1886 char *p;
1887
1888 p = (char *) name;
1889 if (!is_name(*p))
1890 return p;
1891 while (*++p) {
1892 if (!is_in_name(*p))
1893 break;
1894 }
1895 return p;
1896}
1897
1898/*
1899 * Compares two strings up to the first = or '\0'. The first
1900 * string must be terminated by '='; the second may be terminated by
1901 * either '=' or '\0'.
1902 */
1903static int
1904varcmp(const char *p, const char *q)
1905{
1906 int c, d;
1907
1908 while ((c = *p) == (d = *q)) {
1909 if (!c || c == '=')
1910 goto out;
1911 p++;
1912 q++;
1913 }
1914 if (c == '=')
Denis Vlasenko9650f362007-02-23 01:04:37 +00001915 c = '\0';
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001916 if (d == '=')
Denis Vlasenko9650f362007-02-23 01:04:37 +00001917 d = '\0';
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001918 out:
1919 return c - d;
1920}
1921
1922static int
1923varequal(const char *a, const char *b)
1924{
1925 return !varcmp(a, b);
1926}
1927
1928/*
1929 * Find the appropriate entry in the hash table from the name.
1930 */
1931static struct var **
1932hashvar(const char *p)
1933{
1934 unsigned hashval;
1935
1936 hashval = ((unsigned char) *p) << 4;
1937 while (*p && *p != '=')
1938 hashval += (unsigned char) *p++;
1939 return &vartab[hashval % VTABSIZE];
1940}
1941
1942static int
1943vpcmp(const void *a, const void *b)
1944{
1945 return varcmp(*(const char **)a, *(const char **)b);
1946}
1947
1948/*
1949 * This routine initializes the builtin variables.
1950 */
1951static void
1952initvar(void)
1953{
1954 struct var *vp;
1955 struct var *end;
1956 struct var **vpp;
1957
1958 /*
1959 * PS1 depends on uid
1960 */
1961#if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT
1962 vps1.text = "PS1=\\w \\$ ";
1963#else
1964 if (!geteuid())
1965 vps1.text = "PS1=# ";
1966#endif
1967 vp = varinit;
Denis Vlasenko80b8b392007-06-25 10:55:35 +00001968 end = vp + ARRAY_SIZE(varinit);
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001969 do {
1970 vpp = hashvar(vp->text);
1971 vp->next = *vpp;
1972 *vpp = vp;
1973 } while (++vp < end);
1974}
1975
1976static struct var **
1977findvar(struct var **vpp, const char *name)
1978{
1979 for (; *vpp; vpp = &(*vpp)->next) {
1980 if (varequal((*vpp)->text, name)) {
1981 break;
1982 }
1983 }
1984 return vpp;
1985}
1986
1987/*
1988 * Find the value of a variable. Returns NULL if not set.
1989 */
Mike Frysinger98c52642009-04-02 10:02:37 +00001990static const char *
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001991lookupvar(const char *name)
1992{
1993 struct var *v;
1994
1995 v = *findvar(hashvar(name), name);
1996 if (v) {
Denis Vlasenko448d30e2008-06-27 00:24:11 +00001997#if ENABLE_ASH_RANDOM_SUPPORT
Denis Vlasenkoaa744452007-02-23 01:04:22 +00001998 /*
1999 * Dynamic variables are implemented roughly the same way they are
2000 * in bash. Namely, they're "special" so long as they aren't unset.
2001 * As soon as they're unset, they're no longer dynamic, and dynamic
2002 * lookup will no longer happen at that point. -- PFM.
2003 */
2004 if ((v->flags & VDYNAMIC))
2005 (*v->func)(NULL);
2006#endif
2007 if (!(v->flags & VUNSET))
2008 return strchrnul(v->text, '=') + 1;
2009 }
2010 return NULL;
2011}
2012
2013/*
2014 * Search the environment of a builtin command.
2015 */
Mike Frysinger98c52642009-04-02 10:02:37 +00002016static const char *
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002017bltinlookup(const char *name)
2018{
2019 struct strlist *sp;
2020
2021 for (sp = cmdenviron; sp; sp = sp->next) {
2022 if (varequal(sp->text, name))
2023 return strchrnul(sp->text, '=') + 1;
2024 }
2025 return lookupvar(name);
2026}
2027
2028/*
2029 * Same as setvar except that the variable and value are passed in
2030 * the first argument as name=value. Since the first argument will
2031 * be actually stored in the table, it should not be a string that
2032 * will go away.
2033 * Called with interrupts off.
2034 */
2035static void
2036setvareq(char *s, int flags)
2037{
2038 struct var *vp, **vpp;
2039
2040 vpp = hashvar(s);
2041 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
2042 vp = *findvar(vpp, s);
2043 if (vp) {
2044 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
2045 const char *n;
2046
2047 if (flags & VNOSAVE)
2048 free(s);
2049 n = vp->text;
2050 ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n);
2051 }
2052
2053 if (flags & VNOSET)
2054 return;
2055
2056 if (vp->func && (flags & VNOFUNC) == 0)
2057 (*vp->func)(strchrnul(s, '=') + 1);
2058
2059 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
2060 free((char*)vp->text);
2061
2062 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
2063 } else {
2064 if (flags & VNOSET)
2065 return;
2066 /* not found */
Denis Vlasenko597906c2008-02-20 16:38:54 +00002067 vp = ckzalloc(sizeof(*vp));
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002068 vp->next = *vpp;
Denis Vlasenko597906c2008-02-20 16:38:54 +00002069 /*vp->func = NULL; - ckzalloc did it */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002070 *vpp = vp;
2071 }
2072 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
2073 s = ckstrdup(s);
2074 vp->text = s;
2075 vp->flags = flags;
2076}
2077
2078/*
2079 * Set the value of a variable. The flags argument is ored with the
2080 * flags of the variable. If val is NULL, the variable is unset.
2081 */
2082static void
2083setvar(const char *name, const char *val, int flags)
2084{
2085 char *p, *q;
2086 size_t namelen;
2087 char *nameeq;
2088 size_t vallen;
2089
2090 q = endofname(name);
2091 p = strchrnul(q, '=');
2092 namelen = p - name;
2093 if (!namelen || p != q)
2094 ash_msg_and_raise_error("%.*s: bad variable name", namelen, name);
2095 vallen = 0;
2096 if (val == NULL) {
2097 flags |= VUNSET;
2098 } else {
2099 vallen = strlen(val);
2100 }
2101 INT_OFF;
2102 nameeq = ckmalloc(namelen + vallen + 2);
Denis Vlasenko29eb3592008-05-18 14:06:08 +00002103 p = (char *)memcpy(nameeq, name, namelen) + namelen;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002104 if (val) {
2105 *p++ = '=';
Denis Vlasenko29eb3592008-05-18 14:06:08 +00002106 p = (char *)memcpy(p, val, vallen) + vallen;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002107 }
2108 *p = '\0';
2109 setvareq(nameeq, flags | VNOSAVE);
2110 INT_ON;
2111}
2112
2113#if ENABLE_ASH_GETOPTS
2114/*
2115 * Safe version of setvar, returns 1 on success 0 on failure.
2116 */
2117static int
2118setvarsafe(const char *name, const char *val, int flags)
2119{
2120 int err;
2121 volatile int saveint;
2122 struct jmploc *volatile savehandler = exception_handler;
2123 struct jmploc jmploc;
2124
2125 SAVE_INT(saveint);
2126 if (setjmp(jmploc.loc))
2127 err = 1;
2128 else {
2129 exception_handler = &jmploc;
2130 setvar(name, val, flags);
2131 err = 0;
2132 }
2133 exception_handler = savehandler;
2134 RESTORE_INT(saveint);
2135 return err;
2136}
2137#endif
2138
2139/*
2140 * Unset the specified variable.
2141 */
2142static int
2143unsetvar(const char *s)
2144{
2145 struct var **vpp;
2146 struct var *vp;
2147 int retval;
2148
2149 vpp = findvar(hashvar(s), s);
2150 vp = *vpp;
2151 retval = 2;
2152 if (vp) {
2153 int flags = vp->flags;
2154
2155 retval = 1;
2156 if (flags & VREADONLY)
2157 goto out;
Denis Vlasenko448d30e2008-06-27 00:24:11 +00002158#if ENABLE_ASH_RANDOM_SUPPORT
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002159 vp->flags &= ~VDYNAMIC;
2160#endif
2161 if (flags & VUNSET)
2162 goto ok;
2163 if ((flags & VSTRFIXED) == 0) {
2164 INT_OFF;
2165 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
2166 free((char*)vp->text);
2167 *vpp = vp->next;
2168 free(vp);
2169 INT_ON;
2170 } else {
2171 setvar(s, 0, 0);
2172 vp->flags &= ~VEXPORT;
2173 }
2174 ok:
2175 retval = 0;
2176 }
2177 out:
2178 return retval;
2179}
2180
2181/*
2182 * Process a linked list of variable assignments.
2183 */
2184static void
2185listsetvar(struct strlist *list_set_var, int flags)
2186{
2187 struct strlist *lp = list_set_var;
2188
2189 if (!lp)
2190 return;
2191 INT_OFF;
2192 do {
2193 setvareq(lp->text, flags);
Denis Vlasenko9650f362007-02-23 01:04:37 +00002194 lp = lp->next;
2195 } while (lp);
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002196 INT_ON;
2197}
2198
2199/*
2200 * Generate a list of variables satisfying the given conditions.
2201 */
2202static char **
2203listvars(int on, int off, char ***end)
2204{
2205 struct var **vpp;
2206 struct var *vp;
2207 char **ep;
2208 int mask;
2209
2210 STARTSTACKSTR(ep);
2211 vpp = vartab;
2212 mask = on | off;
2213 do {
2214 for (vp = *vpp; vp; vp = vp->next) {
2215 if ((vp->flags & mask) == on) {
2216 if (ep == stackstrend())
2217 ep = growstackstr();
2218 *ep++ = (char *) vp->text;
2219 }
2220 }
2221 } while (++vpp < vartab + VTABSIZE);
2222 if (ep == stackstrend())
2223 ep = growstackstr();
2224 if (end)
2225 *end = ep;
2226 *ep++ = NULL;
2227 return grabstackstr(ep);
2228}
2229
2230
2231/* ============ Path search helper
2232 *
2233 * The variable path (passed by reference) should be set to the start
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02002234 * of the path before the first call; path_advance will update
2235 * this value as it proceeds. Successive calls to path_advance will return
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002236 * the possible path expansions in sequence. If an option (indicated by
2237 * a percent sign) appears in the path entry then the global variable
2238 * pathopt will be set to point to it; otherwise pathopt will be set to
2239 * NULL.
2240 */
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02002241static const char *pathopt; /* set by path_advance */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002242
2243static char *
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02002244path_advance(const char **path, const char *name)
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002245{
2246 const char *p;
2247 char *q;
2248 const char *start;
2249 size_t len;
2250
2251 if (*path == NULL)
2252 return NULL;
2253 start = *path;
Denis Vlasenkof7d56652008-03-25 05:51:41 +00002254 for (p = start; *p && *p != ':' && *p != '%'; p++)
2255 continue;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002256 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
2257 while (stackblocksize() < len)
2258 growstackblock();
2259 q = stackblock();
2260 if (p != start) {
2261 memcpy(q, start, p - start);
2262 q += p - start;
2263 *q++ = '/';
2264 }
2265 strcpy(q, name);
2266 pathopt = NULL;
2267 if (*p == '%') {
2268 pathopt = ++p;
Denis Vlasenkof7d56652008-03-25 05:51:41 +00002269 while (*p && *p != ':')
2270 p++;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002271 }
2272 if (*p == ':')
2273 *path = p + 1;
2274 else
2275 *path = NULL;
2276 return stalloc(len);
2277}
2278
2279
2280/* ============ Prompt */
2281
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +00002282static smallint doprompt; /* if set, prompt the user */
2283static smallint needprompt; /* true if interactive and at start of line */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002284
2285#if ENABLE_FEATURE_EDITING
2286static line_input_t *line_input_state;
2287static const char *cmdedit_prompt;
2288static void
2289putprompt(const char *s)
2290{
2291 if (ENABLE_ASH_EXPAND_PRMT) {
2292 free((char*)cmdedit_prompt);
Denis Vlasenko4222ae42007-02-25 02:37:49 +00002293 cmdedit_prompt = ckstrdup(s);
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002294 return;
2295 }
2296 cmdedit_prompt = s;
2297}
2298#else
2299static void
2300putprompt(const char *s)
2301{
2302 out2str(s);
2303}
2304#endif
2305
2306#if ENABLE_ASH_EXPAND_PRMT
2307/* expandstr() needs parsing machinery, so it is far away ahead... */
2308static const char *expandstr(const char *ps);
2309#else
2310#define expandstr(s) s
2311#endif
2312
2313static void
2314setprompt(int whichprompt)
2315{
2316 const char *prompt;
2317#if ENABLE_ASH_EXPAND_PRMT
2318 struct stackmark smark;
2319#endif
2320
2321 needprompt = 0;
2322
2323 switch (whichprompt) {
2324 case 1:
2325 prompt = ps1val();
2326 break;
2327 case 2:
2328 prompt = ps2val();
2329 break;
2330 default: /* 0 */
2331 prompt = nullstr;
2332 }
2333#if ENABLE_ASH_EXPAND_PRMT
2334 setstackmark(&smark);
2335 stalloc(stackblocksize());
2336#endif
2337 putprompt(expandstr(prompt));
2338#if ENABLE_ASH_EXPAND_PRMT
2339 popstackmark(&smark);
2340#endif
2341}
2342
2343
2344/* ============ The cd and pwd commands */
2345
2346#define CD_PHYSICAL 1
2347#define CD_PRINT 2
2348
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002349static int
2350cdopt(void)
2351{
2352 int flags = 0;
2353 int i, j;
2354
2355 j = 'L';
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02002356 while ((i = nextopt("LP")) != '\0') {
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002357 if (i != j) {
2358 flags ^= CD_PHYSICAL;
2359 j = i;
2360 }
2361 }
2362
2363 return flags;
2364}
2365
2366/*
2367 * Update curdir (the name of the current directory) in response to a
2368 * cd command.
2369 */
2370static const char *
2371updatepwd(const char *dir)
2372{
2373 char *new;
2374 char *p;
2375 char *cdcomppath;
2376 const char *lim;
2377
2378 cdcomppath = ststrdup(dir);
2379 STARTSTACKSTR(new);
2380 if (*dir != '/') {
2381 if (curdir == nullstr)
2382 return 0;
2383 new = stack_putstr(curdir, new);
2384 }
2385 new = makestrspace(strlen(dir) + 2, new);
Denis Vlasenko29eb3592008-05-18 14:06:08 +00002386 lim = (char *)stackblock() + 1;
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002387 if (*dir != '/') {
2388 if (new[-1] != '/')
2389 USTPUTC('/', new);
2390 if (new > lim && *lim == '/')
2391 lim++;
2392 } else {
2393 USTPUTC('/', new);
2394 cdcomppath++;
2395 if (dir[1] == '/' && dir[2] != '/') {
2396 USTPUTC('/', new);
2397 cdcomppath++;
2398 lim++;
2399 }
2400 }
2401 p = strtok(cdcomppath, "/");
2402 while (p) {
2403 switch (*p) {
2404 case '.':
2405 if (p[1] == '.' && p[2] == '\0') {
2406 while (new > lim) {
2407 STUNPUTC(new);
2408 if (new[-1] == '/')
2409 break;
2410 }
2411 break;
Denis Vlasenko16abcd92007-04-13 23:59:52 +00002412 }
2413 if (p[1] == '\0')
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002414 break;
2415 /* fall through */
2416 default:
2417 new = stack_putstr(p, new);
2418 USTPUTC('/', new);
2419 }
2420 p = strtok(0, "/");
2421 }
2422 if (new > lim)
2423 STUNPUTC(new);
2424 *new = 0;
2425 return stackblock();
2426}
2427
2428/*
2429 * Find out what the current directory is. If we already know the current
2430 * directory, this routine returns immediately.
2431 */
2432static char *
2433getpwd(void)
2434{
Denis Vlasenko01631112007-12-16 17:20:38 +00002435 char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002436 return dir ? dir : nullstr;
2437}
2438
2439static void
2440setpwd(const char *val, int setold)
2441{
2442 char *oldcur, *dir;
2443
2444 oldcur = dir = curdir;
2445
2446 if (setold) {
2447 setvar("OLDPWD", oldcur, VEXPORT);
2448 }
2449 INT_OFF;
2450 if (physdir != nullstr) {
2451 if (physdir != oldcur)
2452 free(physdir);
2453 physdir = nullstr;
2454 }
2455 if (oldcur == val || !val) {
2456 char *s = getpwd();
2457 physdir = s;
2458 if (!val)
2459 dir = s;
2460 } else
2461 dir = ckstrdup(val);
2462 if (oldcur != dir && oldcur != nullstr) {
2463 free(oldcur);
2464 }
2465 curdir = dir;
2466 INT_ON;
2467 setvar("PWD", dir, VEXPORT);
2468}
2469
2470static void hashcd(void);
2471
2472/*
2473 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2474 * know that the current directory has changed.
2475 */
2476static int
2477docd(const char *dest, int flags)
2478{
2479 const char *dir = 0;
2480 int err;
2481
2482 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2483
2484 INT_OFF;
2485 if (!(flags & CD_PHYSICAL)) {
2486 dir = updatepwd(dest);
2487 if (dir)
2488 dest = dir;
2489 }
2490 err = chdir(dest);
2491 if (err)
2492 goto out;
2493 setpwd(dir, 1);
2494 hashcd();
2495 out:
2496 INT_ON;
2497 return err;
2498}
2499
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02002500static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00002501cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002502{
2503 const char *dest;
2504 const char *path;
2505 const char *p;
2506 char c;
2507 struct stat statb;
2508 int flags;
2509
2510 flags = cdopt();
2511 dest = *argptr;
2512 if (!dest)
2513 dest = bltinlookup(homestr);
2514 else if (LONE_DASH(dest)) {
2515 dest = bltinlookup("OLDPWD");
2516 flags |= CD_PRINT;
2517 }
2518 if (!dest)
2519 dest = nullstr;
2520 if (*dest == '/')
2521 goto step7;
2522 if (*dest == '.') {
2523 c = dest[1];
2524 dotdot:
2525 switch (c) {
2526 case '\0':
2527 case '/':
2528 goto step6;
2529 case '.':
2530 c = dest[2];
2531 if (c != '.')
2532 goto dotdot;
2533 }
2534 }
2535 if (!*dest)
2536 dest = ".";
2537 path = bltinlookup("CDPATH");
2538 if (!path) {
2539 step6:
2540 step7:
2541 p = dest;
2542 goto docd;
2543 }
2544 do {
2545 c = *path;
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02002546 p = path_advance(&path, dest);
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002547 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2548 if (c && c != ':')
2549 flags |= CD_PRINT;
2550 docd:
2551 if (!docd(p, flags))
2552 goto out;
2553 break;
2554 }
2555 } while (path);
2556 ash_msg_and_raise_error("can't cd to %s", dest);
2557 /* NOTREACHED */
2558 out:
2559 if (flags & CD_PRINT)
2560 out1fmt(snlfmt, curdir);
2561 return 0;
2562}
2563
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02002564static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00002565pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Denis Vlasenkoaa744452007-02-23 01:04:22 +00002566{
2567 int flags;
2568 const char *dir = curdir;
2569
2570 flags = cdopt();
2571 if (flags) {
2572 if (physdir == nullstr)
2573 setpwd(dir, 0);
2574 dir = physdir;
2575 }
2576 out1fmt(snlfmt, dir);
2577 return 0;
2578}
2579
Denis Vlasenko0c032a42007-02-23 01:03:40 +00002580
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00002581/* ============ ... */
Eric Andersenc470f442003-07-28 09:56:35 +00002582
Denis Vlasenko834dee72008-10-07 09:18:30 +00002583
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +00002584#define IBUFSIZ COMMON_BUFSIZE
Denis Vlasenko834dee72008-10-07 09:18:30 +00002585/* buffer for top level input file */
2586#define basebuf bb_common_bufsiz1
Eric Andersenc470f442003-07-28 09:56:35 +00002587
Eric Andersenc470f442003-07-28 09:56:35 +00002588/* Syntax classes */
Denis Vlasenko834dee72008-10-07 09:18:30 +00002589#define CWORD 0 /* character is nothing special */
2590#define CNL 1 /* newline character */
2591#define CBACK 2 /* a backslash character */
2592#define CSQUOTE 3 /* single quote */
2593#define CDQUOTE 4 /* double quote */
Eric Andersenc470f442003-07-28 09:56:35 +00002594#define CENDQUOTE 5 /* a terminating quote */
Denis Vlasenko834dee72008-10-07 09:18:30 +00002595#define CBQUOTE 6 /* backwards single quote */
2596#define CVAR 7 /* a dollar sign */
2597#define CENDVAR 8 /* a '}' character */
2598#define CLP 9 /* a left paren in arithmetic */
2599#define CRP 10 /* a right paren in arithmetic */
Eric Andersenc470f442003-07-28 09:56:35 +00002600#define CENDFILE 11 /* end of file */
Denis Vlasenko834dee72008-10-07 09:18:30 +00002601#define CCTL 12 /* like CWORD, except it must be escaped */
2602#define CSPCL 13 /* these terminate a word */
2603#define CIGN 14 /* character should be ignored */
Eric Andersenc470f442003-07-28 09:56:35 +00002604
Denis Vlasenko131ae172007-02-18 13:00:19 +00002605#if ENABLE_ASH_ALIAS
Denis Vlasenko834dee72008-10-07 09:18:30 +00002606#define SYNBASE 130
2607#define PEOF -130
2608#define PEOA -129
Eric Andersenc470f442003-07-28 09:56:35 +00002609#define PEOA_OR_PEOF PEOA
2610#else
Denis Vlasenko834dee72008-10-07 09:18:30 +00002611#define SYNBASE 129
2612#define PEOF -129
Eric Andersenc470f442003-07-28 09:56:35 +00002613#define PEOA_OR_PEOF PEOF
2614#endif
2615
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002616/* number syntax index */
2617#define BASESYNTAX 0 /* not in quotes */
2618#define DQSYNTAX 1 /* in double quotes */
2619#define SQSYNTAX 2 /* in single quotes */
2620#define ARISYNTAX 3 /* in arithmetic */
Denis Vlasenko46a53062007-09-24 18:30:02 +00002621#define PSSYNTAX 4 /* prompt */
Eric Andersenc470f442003-07-28 09:56:35 +00002622
Denis Vlasenko131ae172007-02-18 13:00:19 +00002623#if ENABLE_ASH_OPTIMIZE_FOR_SIZE
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002624#define USE_SIT_FUNCTION
2625#endif
2626
Mike Frysinger98c52642009-04-02 10:02:37 +00002627#if ENABLE_SH_MATH_SUPPORT
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002628static const char S_I_T[][4] = {
Denis Vlasenko131ae172007-02-18 13:00:19 +00002629#if ENABLE_ASH_ALIAS
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002630 { CSPCL, CIGN, CIGN, CIGN }, /* 0, PEOA */
Eric Andersenc470f442003-07-28 09:56:35 +00002631#endif
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002632 { CSPCL, CWORD, CWORD, CWORD }, /* 1, ' ' */
2633 { CNL, CNL, CNL, CNL }, /* 2, \n */
2634 { CWORD, CCTL, CCTL, CWORD }, /* 3, !*-/:=?[]~ */
2635 { CDQUOTE, CENDQUOTE, CWORD, CWORD }, /* 4, '"' */
2636 { CVAR, CVAR, CWORD, CVAR }, /* 5, $ */
2637 { CSQUOTE, CWORD, CENDQUOTE, CWORD }, /* 6, "'" */
2638 { CSPCL, CWORD, CWORD, CLP }, /* 7, ( */
2639 { CSPCL, CWORD, CWORD, CRP }, /* 8, ) */
2640 { CBACK, CBACK, CCTL, CBACK }, /* 9, \ */
2641 { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* 10, ` */
2642 { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* 11, } */
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002643#ifndef USE_SIT_FUNCTION
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002644 { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2645 { CWORD, CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2646 { CCTL, CCTL, CCTL, CCTL } /* 14, CTLESC ... */
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002647#endif
Eric Andersen2870d962001-07-02 17:27:21 +00002648};
Eric Andersenc470f442003-07-28 09:56:35 +00002649#else
2650static const char S_I_T[][3] = {
Denis Vlasenko131ae172007-02-18 13:00:19 +00002651#if ENABLE_ASH_ALIAS
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002652 { CSPCL, CIGN, CIGN }, /* 0, PEOA */
Eric Andersenc470f442003-07-28 09:56:35 +00002653#endif
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002654 { CSPCL, CWORD, CWORD }, /* 1, ' ' */
2655 { CNL, CNL, CNL }, /* 2, \n */
2656 { CWORD, CCTL, CCTL }, /* 3, !*-/:=?[]~ */
2657 { CDQUOTE, CENDQUOTE, CWORD }, /* 4, '"' */
2658 { CVAR, CVAR, CWORD }, /* 5, $ */
2659 { CSQUOTE, CWORD, CENDQUOTE }, /* 6, "'" */
2660 { CSPCL, CWORD, CWORD }, /* 7, ( */
2661 { CSPCL, CWORD, CWORD }, /* 8, ) */
2662 { CBACK, CBACK, CCTL }, /* 9, \ */
2663 { CBQUOTE, CBQUOTE, CWORD }, /* 10, ` */
2664 { CENDVAR, CENDVAR, CWORD }, /* 11, } */
Eric Andersenc470f442003-07-28 09:56:35 +00002665#ifndef USE_SIT_FUNCTION
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002666 { CENDFILE, CENDFILE, CENDFILE }, /* 12, PEOF */
2667 { CWORD, CWORD, CWORD }, /* 13, 0-9A-Za-z */
2668 { CCTL, CCTL, CCTL } /* 14, CTLESC ... */
Eric Andersenc470f442003-07-28 09:56:35 +00002669#endif
2670};
Mike Frysinger98c52642009-04-02 10:02:37 +00002671#endif /* SH_MATH_SUPPORT */
Eric Andersen2870d962001-07-02 17:27:21 +00002672
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002673#ifdef USE_SIT_FUNCTION
2674
Denis Vlasenko0c032a42007-02-23 01:03:40 +00002675static int
2676SIT(int c, int syntax)
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002677{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00002678 static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
Denis Vlasenko131ae172007-02-18 13:00:19 +00002679#if ENABLE_ASH_ALIAS
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00002680 static const char syntax_index_table[] ALIGN1 = {
Eric Andersenc470f442003-07-28 09:56:35 +00002681 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
2682 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
2683 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
2684 11, 3 /* "}~" */
2685 };
2686#else
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00002687 static const char syntax_index_table[] ALIGN1 = {
Eric Andersenc470f442003-07-28 09:56:35 +00002688 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
2689 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
2690 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
2691 10, 2 /* "}~" */
2692 };
2693#endif
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002694 const char *s;
2695 int indx;
2696
Denis Vlasenko0dfe1d22009-04-02 12:57:38 +00002697 if (c == PEOF) { /* 2^8+2 */
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002698 return CENDFILE;
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002699 }
Denis Vlasenko0dfe1d22009-04-02 12:57:38 +00002700#if ENABLE_ASH_ALIAS
2701 if (c == PEOA) { /* 2^8+1 */
2702 indx = 0;
2703 } else
2704#endif
2705 {
Denys Vlasenkob0d63382009-09-16 16:18:32 +02002706 if ((unsigned char)c >= CTLESC
2707 && (unsigned char)c <= CTLQUOTEMARK
Denis Vlasenko0dfe1d22009-04-02 12:57:38 +00002708 ) {
2709 return CCTL;
2710 }
2711 s = strchrnul(spec_symbls, c);
2712 if (*s == '\0') {
2713 return CWORD;
2714 }
2715 indx = syntax_index_table[s - spec_symbls];
2716 }
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002717 return S_I_T[indx][syntax];
2718}
2719
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002720#else /* !USE_SIT_FUNCTION */
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002721
Denis Vlasenko131ae172007-02-18 13:00:19 +00002722#if ENABLE_ASH_ALIAS
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002723#define CSPCL_CIGN_CIGN_CIGN 0
2724#define CSPCL_CWORD_CWORD_CWORD 1
2725#define CNL_CNL_CNL_CNL 2
2726#define CWORD_CCTL_CCTL_CWORD 3
2727#define CDQUOTE_CENDQUOTE_CWORD_CWORD 4
2728#define CVAR_CVAR_CWORD_CVAR 5
2729#define CSQUOTE_CWORD_CENDQUOTE_CWORD 6
2730#define CSPCL_CWORD_CWORD_CLP 7
2731#define CSPCL_CWORD_CWORD_CRP 8
2732#define CBACK_CBACK_CCTL_CBACK 9
2733#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
2734#define CENDVAR_CENDVAR_CWORD_CENDVAR 11
2735#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
2736#define CWORD_CWORD_CWORD_CWORD 13
2737#define CCTL_CCTL_CCTL_CCTL 14
Eric Andersenc470f442003-07-28 09:56:35 +00002738#else
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00002739#define CSPCL_CWORD_CWORD_CWORD 0
2740#define CNL_CNL_CNL_CNL 1
2741#define CWORD_CCTL_CCTL_CWORD 2
2742#define CDQUOTE_CENDQUOTE_CWORD_CWORD 3
2743#define CVAR_CVAR_CWORD_CVAR 4
2744#define CSQUOTE_CWORD_CENDQUOTE_CWORD 5
2745#define CSPCL_CWORD_CWORD_CLP 6
2746#define CSPCL_CWORD_CWORD_CRP 7
2747#define CBACK_CBACK_CCTL_CBACK 8
2748#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9
2749#define CENDVAR_CENDVAR_CWORD_CENDVAR 10
2750#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11
2751#define CWORD_CWORD_CWORD_CWORD 12
2752#define CCTL_CCTL_CCTL_CCTL 13
Eric Andersenc470f442003-07-28 09:56:35 +00002753#endif
Manuel Novoa III 16815d42001-08-10 19:36:07 +00002754
2755static const char syntax_index_table[258] = {
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00002756 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
Eric Andersenc470f442003-07-28 09:56:35 +00002757 /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
Denis Vlasenko131ae172007-02-18 13:00:19 +00002758#if ENABLE_ASH_ALIAS
Eric Andersenc470f442003-07-28 09:56:35 +00002759 /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN,
2760#endif
2761 /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD,
2762 /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL,
2763 /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
2764 /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
2765 /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
2766 /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
2767 /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL,
2768 /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
2769 /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00002770 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
2771 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
2772 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
2773 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
2774 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
2775 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
2776 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
2777 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
2778 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
2779 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
2780 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
2781 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
2782 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
2783 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
2784 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
2785 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
2786 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
2787 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
2788 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
2789 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
2790 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
2791 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
2792 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
2793 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
2794 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
2795 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
2796 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
2797 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
2798 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
2799 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
2800 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
2801 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
2802 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
2803 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
2804 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
2805 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
2806 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
2807 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
2808 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
2809 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
2810 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
2811 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
2812 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
2813 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
2814 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
2815 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
2816 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
2817 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
2818 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
2819 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
2820 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
2821 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
2822 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
2823 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
2824 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
2825 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
2826 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
2827 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
2828 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
2829 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
2830 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
2831 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
2832 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
2833 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
2834 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
2835 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
2836 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
2837 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
2838 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
2839 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
2840 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
2841 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
2842 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
2843 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
2844 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
2845 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
2846 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
2847 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
2848 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
2849 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
2850 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
2851 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
2852 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
2853 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
2854 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
2855 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
2856 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
2857 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
2858 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
2859 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
2860 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
2861 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
2862 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
2863 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
2864 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
2865 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
2866 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
2867 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
2868 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
2869 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
2870 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
2871 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
2872 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
2873 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
2874 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
2875 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
2876 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
2877 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
2878 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
2879 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
2880 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
2881 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
2882 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
2883 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
2884 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
2885 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
2886 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
2887 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
2888 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
2889 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
2890 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
2891 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
2892 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
2893 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
2894 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
2895 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
2896 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
2897 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
2898 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
2899 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
2900 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
2901 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
2902 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
2903 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
2904 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
2905 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
2906 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
2907 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
2908 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
2909 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
2910 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
2911 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
2912 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
2913 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
2914 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
2915 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
2916 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
2917 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
2918 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
2919 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
2920 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
2921 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
2922 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
Eric Andersenc470f442003-07-28 09:56:35 +00002923 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00002924 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
2925 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
2926 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
2927 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
Eric Andersenc470f442003-07-28 09:56:35 +00002928 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00002929 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
2930 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
2931 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
2932 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
2933 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
2934 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
2935 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
2936 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
2937 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
2938 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
2939 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
2940 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
2941 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
2942 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
2943 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
2944 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
2945 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
2946 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
2947 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
2948 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
2949 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
2950 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
2951 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
2952 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
2953 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
2954 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
2955 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
2956 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
2957 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
2958 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
2959 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
2960 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
2961 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
2962 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
2963 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
2964 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
2965 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
2966 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
2967 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
2968 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
2969 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
2970 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
2971 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
2972 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
2973 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
2974 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
2975 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
2976 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
2977 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
2978 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
2979 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
2980 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
2981 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
2982 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
2983 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
2984 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
2985 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
2986 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
2987 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
2988 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
2989 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
2990 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
2991 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
2992 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
2993 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
2994 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
2995 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
2996 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
2997 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
2998 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
2999 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
3000 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
3001 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
3002 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
3003 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
3004 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
3005 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
3006 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
3007 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
3008 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
3009 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
3010 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
3011 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
3012 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
3013 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
3014 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
3015 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
3016 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
Eric Andersen2870d962001-07-02 17:27:21 +00003017};
3018
Denis Vlasenko0dfe1d22009-04-02 12:57:38 +00003019#define SIT(c, syntax) (S_I_T[(int)syntax_index_table[(int)(c) + SYNBASE]][syntax])
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00003020
"Vladimir N. Oleynik"fdb871c2006-01-25 11:53:47 +00003021#endif /* USE_SIT_FUNCTION */
Eric Andersenc470f442003-07-28 09:56:35 +00003022
Eric Andersen2870d962001-07-02 17:27:21 +00003023
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00003024/* ============ Alias handling */
Denis Vlasenkofc06f292007-02-23 21:09:35 +00003025
Denis Vlasenko131ae172007-02-18 13:00:19 +00003026#if ENABLE_ASH_ALIAS
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00003027
3028#define ALIASINUSE 1
3029#define ALIASDEAD 2
3030
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00003031struct alias {
3032 struct alias *next;
3033 char *name;
3034 char *val;
3035 int flag;
3036};
3037
Denis Vlasenko01631112007-12-16 17:20:38 +00003038
3039static struct alias **atab; // [ATABSIZE];
3040#define INIT_G_alias() do { \
3041 atab = xzalloc(ATABSIZE * sizeof(atab[0])); \
3042} while (0)
3043
Eric Andersen2870d962001-07-02 17:27:21 +00003044
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00003045static struct alias **
3046__lookupalias(const char *name) {
3047 unsigned int hashval;
3048 struct alias **app;
3049 const char *p;
3050 unsigned int ch;
3051
3052 p = name;
3053
3054 ch = (unsigned char)*p;
3055 hashval = ch << 4;
3056 while (ch) {
3057 hashval += ch;
3058 ch = (unsigned char)*++p;
3059 }
3060 app = &atab[hashval % ATABSIZE];
3061
3062 for (; *app; app = &(*app)->next) {
3063 if (strcmp(name, (*app)->name) == 0) {
3064 break;
3065 }
3066 }
3067
3068 return app;
3069}
3070
3071static struct alias *
3072lookupalias(const char *name, int check)
3073{
3074 struct alias *ap = *__lookupalias(name);
3075
3076 if (check && ap && (ap->flag & ALIASINUSE))
3077 return NULL;
3078 return ap;
3079}
3080
3081static struct alias *
3082freealias(struct alias *ap)
3083{
3084 struct alias *next;
3085
3086 if (ap->flag & ALIASINUSE) {
3087 ap->flag |= ALIASDEAD;
3088 return ap;
3089 }
3090
3091 next = ap->next;
3092 free(ap->name);
3093 free(ap->val);
3094 free(ap);
3095 return next;
3096}
Eric Andersencb57d552001-06-28 07:25:16 +00003097
Eric Andersenc470f442003-07-28 09:56:35 +00003098static void
3099setalias(const char *name, const char *val)
Eric Andersencb57d552001-06-28 07:25:16 +00003100{
3101 struct alias *ap, **app;
3102
3103 app = __lookupalias(name);
3104 ap = *app;
Denis Vlasenkob012b102007-02-19 22:43:01 +00003105 INT_OFF;
Eric Andersencb57d552001-06-28 07:25:16 +00003106 if (ap) {
3107 if (!(ap->flag & ALIASINUSE)) {
Denis Vlasenkob012b102007-02-19 22:43:01 +00003108 free(ap->val);
Eric Andersencb57d552001-06-28 07:25:16 +00003109 }
Denis Vlasenko0c032a42007-02-23 01:03:40 +00003110 ap->val = ckstrdup(val);
Eric Andersencb57d552001-06-28 07:25:16 +00003111 ap->flag &= ~ALIASDEAD;
3112 } else {
3113 /* not found */
Denis Vlasenko597906c2008-02-20 16:38:54 +00003114 ap = ckzalloc(sizeof(struct alias));
Denis Vlasenko0c032a42007-02-23 01:03:40 +00003115 ap->name = ckstrdup(name);
3116 ap->val = ckstrdup(val);
Denis Vlasenko597906c2008-02-20 16:38:54 +00003117 /*ap->flag = 0; - ckzalloc did it */
3118 /*ap->next = NULL;*/
Eric Andersencb57d552001-06-28 07:25:16 +00003119 *app = ap;
3120 }
Denis Vlasenkob012b102007-02-19 22:43:01 +00003121 INT_ON;
Eric Andersencb57d552001-06-28 07:25:16 +00003122}
3123
Eric Andersenc470f442003-07-28 09:56:35 +00003124static int
3125unalias(const char *name)
Eric Andersen2870d962001-07-02 17:27:21 +00003126{
Eric Andersencb57d552001-06-28 07:25:16 +00003127 struct alias **app;
3128
3129 app = __lookupalias(name);
3130
3131 if (*app) {
Denis Vlasenkob012b102007-02-19 22:43:01 +00003132 INT_OFF;
Eric Andersencb57d552001-06-28 07:25:16 +00003133 *app = freealias(*app);
Denis Vlasenkob012b102007-02-19 22:43:01 +00003134 INT_ON;
Denis Vlasenko079f8af2006-11-27 16:49:31 +00003135 return 0;
Eric Andersencb57d552001-06-28 07:25:16 +00003136 }
3137
Denis Vlasenko079f8af2006-11-27 16:49:31 +00003138 return 1;
Eric Andersencb57d552001-06-28 07:25:16 +00003139}
3140
Eric Andersenc470f442003-07-28 09:56:35 +00003141static void
3142rmaliases(void)
Eric Andersen2870d962001-07-02 17:27:21 +00003143{
Eric Andersencb57d552001-06-28 07:25:16 +00003144 struct alias *ap, **app;
3145 int i;
3146
Denis Vlasenkob012b102007-02-19 22:43:01 +00003147 INT_OFF;
Eric Andersencb57d552001-06-28 07:25:16 +00003148 for (i = 0; i < ATABSIZE; i++) {
3149 app = &atab[i];
3150 for (ap = *app; ap; ap = *app) {
3151 *app = freealias(*app);
3152 if (ap == *app) {
3153 app = &ap->next;
3154 }
3155 }
3156 }
Denis Vlasenkob012b102007-02-19 22:43:01 +00003157 INT_ON;
Eric Andersencb57d552001-06-28 07:25:16 +00003158}
3159
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00003160static void
3161printalias(const struct alias *ap)
3162{
3163 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
3164}
3165
Eric Andersencb57d552001-06-28 07:25:16 +00003166/*
3167 * TODO - sort output
3168 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02003169static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00003170aliascmd(int argc UNUSED_PARAM, char **argv)
Eric Andersencb57d552001-06-28 07:25:16 +00003171{
3172 char *n, *v;
3173 int ret = 0;
3174 struct alias *ap;
3175
Denis Vlasenko68404f12008-03-17 09:00:54 +00003176 if (!argv[1]) {
Eric Andersencb57d552001-06-28 07:25:16 +00003177 int i;
3178
Denis Vlasenko68404f12008-03-17 09:00:54 +00003179 for (i = 0; i < ATABSIZE; i++) {
Eric Andersencb57d552001-06-28 07:25:16 +00003180 for (ap = atab[i]; ap; ap = ap->next) {
3181 printalias(ap);
3182 }
Denis Vlasenko68404f12008-03-17 09:00:54 +00003183 }
Denis Vlasenko079f8af2006-11-27 16:49:31 +00003184 return 0;
Eric Andersencb57d552001-06-28 07:25:16 +00003185 }
3186 while ((n = *++argv) != NULL) {
Denis Vlasenko5cedb752007-02-18 19:56:41 +00003187 v = strchr(n+1, '=');
3188 if (v == NULL) { /* n+1: funny ksh stuff */
3189 ap = *__lookupalias(n);
3190 if (ap == NULL) {
Eric Andersenc470f442003-07-28 09:56:35 +00003191 fprintf(stderr, "%s: %s not found\n", "alias", n);
Eric Andersencb57d552001-06-28 07:25:16 +00003192 ret = 1;
3193 } else
3194 printalias(ap);
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00003195 } else {
Eric Andersencb57d552001-06-28 07:25:16 +00003196 *v++ = '\0';
3197 setalias(n, v);
3198 }
3199 }
3200
Denis Vlasenkod9e15f22006-11-27 16:49:55 +00003201 return ret;
Eric Andersencb57d552001-06-28 07:25:16 +00003202}
3203
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02003204static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00003205unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Eric Andersencb57d552001-06-28 07:25:16 +00003206{
3207 int i;
3208
3209 while ((i = nextopt("a")) != '\0') {
3210 if (i == 'a') {
3211 rmaliases();
Denis Vlasenko079f8af2006-11-27 16:49:31 +00003212 return 0;
Eric Andersencb57d552001-06-28 07:25:16 +00003213 }
3214 }
3215 for (i = 0; *argptr; argptr++) {
3216 if (unalias(*argptr)) {
Eric Andersenc470f442003-07-28 09:56:35 +00003217 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
Eric Andersencb57d552001-06-28 07:25:16 +00003218 i = 1;
3219 }
3220 }
3221
Denis Vlasenkod9e15f22006-11-27 16:49:55 +00003222 return i;
Eric Andersencb57d552001-06-28 07:25:16 +00003223}
Denis Vlasenkofc06f292007-02-23 21:09:35 +00003224
Denis Vlasenko131ae172007-02-18 13:00:19 +00003225#endif /* ASH_ALIAS */
Eric Andersencb57d552001-06-28 07:25:16 +00003226
Eric Andersenc470f442003-07-28 09:56:35 +00003227
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003228/* ============ jobs.c */
3229
3230/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
3231#define FORK_FG 0
3232#define FORK_BG 1
3233#define FORK_NOJOB 2
3234
3235/* mode flags for showjob(s) */
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003236#define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */
3237#define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */
3238#define SHOW_CHANGED 0x04 /* only jobs whose state has changed */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003239
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003240/*
3241 * A job structure contains information about a job. A job is either a
3242 * single process or a set of processes contained in a pipeline. In the
3243 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
3244 * array of pids.
3245 */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003246struct procstat {
3247 pid_t pid; /* process id */
3248 int status; /* last process status from wait() */
3249 char *cmd; /* text of command being run */
3250};
3251
3252struct job {
3253 struct procstat ps0; /* status of process */
3254 struct procstat *ps; /* status or processes when more than one */
3255#if JOBS
3256 int stopstatus; /* status of a stopped job */
3257#endif
3258 uint32_t
3259 nprocs: 16, /* number of processes */
3260 state: 8,
3261#define JOBRUNNING 0 /* at least one proc running */
3262#define JOBSTOPPED 1 /* all procs are stopped */
3263#define JOBDONE 2 /* all procs are completed */
3264#if JOBS
3265 sigint: 1, /* job was killed by SIGINT */
3266 jobctl: 1, /* job running under job control */
3267#endif
3268 waited: 1, /* true if this entry has been waited for */
3269 used: 1, /* true if this entry is in used */
3270 changed: 1; /* true if status has changed */
3271 struct job *prev_job; /* previous job */
3272};
3273
Denis Vlasenko68404f12008-03-17 09:00:54 +00003274static struct job *makejob(/*union node *,*/ int);
Denis Vlasenko85c24712008-03-17 09:04:04 +00003275#if !JOBS
3276#define forkshell(job, node, mode) forkshell(job, mode)
3277#endif
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003278static int forkshell(struct job *, union node *, int);
3279static int waitforjob(struct job *);
3280
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00003281#if !JOBS
Denis Vlasenkob07a4962008-06-22 13:16:23 +00003282enum { doing_jobctl = 0 };
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00003283#define setjobctl(on) do {} while (0)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003284#else
Denis Vlasenko448d30e2008-06-27 00:24:11 +00003285static smallint doing_jobctl; //references:8
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003286static void setjobctl(int);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003287#endif
3288
3289/*
Denis Vlasenko4b875702009-03-19 13:30:04 +00003290 * Ignore a signal.
3291 */
3292static void
3293ignoresig(int signo)
3294{
3295 /* Avoid unnecessary system calls. Is it already SIG_IGNed? */
3296 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
3297 /* No, need to do it */
3298 signal(signo, SIG_IGN);
3299 }
3300 sigmode[signo - 1] = S_HARD_IGN;
3301}
3302
3303/*
3304 * Signal handler. Only one usage site - in setsignal()
3305 */
3306static void
3307onsig(int signo)
3308{
3309 gotsig[signo - 1] = 1;
3310
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02003311 if (signo == SIGINT && !trap[SIGINT]) {
3312 if (!suppress_int) {
3313 pending_sig = 0;
Denis Vlasenko4b875702009-03-19 13:30:04 +00003314 raise_interrupt(); /* does not return */
3315 }
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02003316 pending_int = 1;
Denis Vlasenko4b875702009-03-19 13:30:04 +00003317 } else {
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02003318 pending_sig = signo;
Denis Vlasenko4b875702009-03-19 13:30:04 +00003319 }
3320}
3321
3322/*
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003323 * Set the signal handler for the specified signal. The routine figures
3324 * out what it should be set to.
3325 */
3326static void
3327setsignal(int signo)
3328{
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003329 char *t;
3330 char cur_act, new_act;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003331 struct sigaction act;
3332
3333 t = trap[signo];
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003334 new_act = S_DFL;
3335 if (t != NULL) { /* trap for this sig is set */
3336 new_act = S_CATCH;
3337 if (t[0] == '\0') /* trap is "": ignore this sig */
3338 new_act = S_IGN;
3339 }
3340
3341 if (rootshell && new_act == S_DFL) {
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003342 switch (signo) {
3343 case SIGINT:
3344 if (iflag || minusc || sflag == 0)
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003345 new_act = S_CATCH;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003346 break;
3347 case SIGQUIT:
3348#if DEBUG
3349 if (debug)
3350 break;
3351#endif
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003352 /* man bash:
3353 * "In all cases, bash ignores SIGQUIT. Non-builtin
3354 * commands run by bash have signal handlers
3355 * set to the values inherited by the shell
3356 * from its parent". */
3357 new_act = S_IGN;
3358 break;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003359 case SIGTERM:
3360 if (iflag)
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003361 new_act = S_IGN;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003362 break;
3363#if JOBS
3364 case SIGTSTP:
3365 case SIGTTOU:
3366 if (mflag)
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003367 new_act = S_IGN;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003368 break;
3369#endif
3370 }
3371 }
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003372//TODO: if !rootshell, we reset SIGQUIT to DFL,
3373//whereas we have to restore it to what shell got on entry
3374//from the parent. See comment above
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003375
3376 t = &sigmode[signo - 1];
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003377 cur_act = *t;
3378 if (cur_act == 0) {
3379 /* current setting is not yet known */
3380 if (sigaction(signo, NULL, &act)) {
3381 /* pretend it worked; maybe we should give a warning,
3382 * but other shells don't. We don't alter sigmode,
3383 * so we retry every time.
3384 * btw, in Linux it never fails. --vda */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003385 return;
3386 }
3387 if (act.sa_handler == SIG_IGN) {
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003388 cur_act = S_HARD_IGN;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003389 if (mflag
3390 && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU)
3391 ) {
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003392 cur_act = S_IGN; /* don't hard ignore these */
Denis Vlasenko991a1da2008-02-10 19:02:53 +00003393 }
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003394 }
3395 }
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003396 if (cur_act == S_HARD_IGN || cur_act == new_act)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003397 return;
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003398
Denis Vlasenko991a1da2008-02-10 19:02:53 +00003399 act.sa_handler = SIG_DFL;
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003400 switch (new_act) {
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003401 case S_CATCH:
3402 act.sa_handler = onsig;
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003403 act.sa_flags = 0; /* matters only if !DFL and !IGN */
3404 sigfillset(&act.sa_mask); /* ditto */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003405 break;
3406 case S_IGN:
3407 act.sa_handler = SIG_IGN;
3408 break;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003409 }
Denis Vlasenko8e2cfec2008-03-12 23:19:35 +00003410 sigaction_set(signo, &act);
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003411
3412 *t = new_act;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003413}
3414
3415/* mode flags for set_curjob */
3416#define CUR_DELETE 2
3417#define CUR_RUNNING 1
3418#define CUR_STOPPED 0
3419
3420/* mode flags for dowait */
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00003421#define DOWAIT_NONBLOCK WNOHANG
3422#define DOWAIT_BLOCK 0
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003423
3424#if JOBS
3425/* pgrp of shell on invocation */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00003426static int initialpgrp; //references:2
3427static int ttyfd = -1; //5
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003428#endif
3429/* array of jobs */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00003430static struct job *jobtab; //5
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003431/* size of array */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00003432static unsigned njobs; //4
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003433/* current job */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00003434static struct job *curjob; //lots
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003435/* number of presumed living untracked jobs */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00003436static int jobless; //4
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003437
3438static void
3439set_curjob(struct job *jp, unsigned mode)
3440{
3441 struct job *jp1;
3442 struct job **jpp, **curp;
3443
3444 /* first remove from list */
3445 jpp = curp = &curjob;
3446 do {
3447 jp1 = *jpp;
3448 if (jp1 == jp)
3449 break;
3450 jpp = &jp1->prev_job;
3451 } while (1);
3452 *jpp = jp1->prev_job;
3453
3454 /* Then re-insert in correct position */
3455 jpp = curp;
3456 switch (mode) {
3457 default:
3458#if DEBUG
3459 abort();
3460#endif
3461 case CUR_DELETE:
3462 /* job being deleted */
3463 break;
3464 case CUR_RUNNING:
3465 /* newly created job or backgrounded job,
3466 put after all stopped jobs. */
3467 do {
3468 jp1 = *jpp;
3469#if JOBS
3470 if (!jp1 || jp1->state != JOBSTOPPED)
3471#endif
3472 break;
3473 jpp = &jp1->prev_job;
3474 } while (1);
3475 /* FALLTHROUGH */
3476#if JOBS
3477 case CUR_STOPPED:
3478#endif
3479 /* newly stopped job - becomes curjob */
3480 jp->prev_job = *jpp;
3481 *jpp = jp;
3482 break;
3483 }
3484}
3485
3486#if JOBS || DEBUG
3487static int
3488jobno(const struct job *jp)
3489{
3490 return jp - jobtab + 1;
3491}
3492#endif
3493
3494/*
3495 * Convert a job name to a job structure.
3496 */
Denis Vlasenko85c24712008-03-17 09:04:04 +00003497#if !JOBS
3498#define getjob(name, getctl) getjob(name)
3499#endif
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003500static struct job *
3501getjob(const char *name, int getctl)
3502{
3503 struct job *jp;
3504 struct job *found;
Denys Vlasenkoffc39202009-08-17 02:12:20 +02003505 const char *err_msg = "%s: no such job";
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003506 unsigned num;
3507 int c;
3508 const char *p;
3509 char *(*match)(const char *, const char *);
3510
3511 jp = curjob;
3512 p = name;
3513 if (!p)
3514 goto currentjob;
3515
3516 if (*p != '%')
3517 goto err;
3518
3519 c = *++p;
3520 if (!c)
3521 goto currentjob;
3522
3523 if (!p[1]) {
3524 if (c == '+' || c == '%') {
3525 currentjob:
3526 err_msg = "No current job";
3527 goto check;
3528 }
3529 if (c == '-') {
3530 if (jp)
3531 jp = jp->prev_job;
3532 err_msg = "No previous job";
3533 check:
3534 if (!jp)
3535 goto err;
3536 goto gotit;
3537 }
3538 }
3539
3540 if (is_number(p)) {
3541 num = atoi(p);
3542 if (num < njobs) {
3543 jp = jobtab + num - 1;
3544 if (jp->used)
3545 goto gotit;
3546 goto err;
3547 }
3548 }
3549
3550 match = prefix;
3551 if (*p == '?') {
3552 match = strstr;
3553 p++;
3554 }
3555
Denys Vlasenkoffc39202009-08-17 02:12:20 +02003556 found = NULL;
3557 while (jp) {
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003558 if (match(jp->ps[0].cmd, p)) {
3559 if (found)
3560 goto err;
3561 found = jp;
3562 err_msg = "%s: ambiguous";
3563 }
3564 jp = jp->prev_job;
3565 }
Denys Vlasenkoffc39202009-08-17 02:12:20 +02003566 if (!found)
3567 goto err;
3568 jp = found;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003569
3570 gotit:
3571#if JOBS
3572 err_msg = "job %s not created under job control";
3573 if (getctl && jp->jobctl == 0)
3574 goto err;
3575#endif
3576 return jp;
3577 err:
3578 ash_msg_and_raise_error(err_msg, name);
3579}
3580
3581/*
3582 * Mark a job structure as unused.
3583 */
3584static void
3585freejob(struct job *jp)
3586{
3587 struct procstat *ps;
3588 int i;
3589
3590 INT_OFF;
3591 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
3592 if (ps->cmd != nullstr)
3593 free(ps->cmd);
3594 }
3595 if (jp->ps != &jp->ps0)
3596 free(jp->ps);
3597 jp->used = 0;
3598 set_curjob(jp, CUR_DELETE);
3599 INT_ON;
3600}
3601
3602#if JOBS
3603static void
3604xtcsetpgrp(int fd, pid_t pgrp)
3605{
3606 if (tcsetpgrp(fd, pgrp))
Bernhard Reutner-Fischera53de7f2008-07-21 13:46:54 +00003607 ash_msg_and_raise_error("can't set tty process group (%m)");
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003608}
3609
3610/*
3611 * Turn job control on and off.
3612 *
3613 * Note: This code assumes that the third arg to ioctl is a character
3614 * pointer, which is true on Berkeley systems but not System V. Since
3615 * System V doesn't have job control yet, this isn't a problem now.
3616 *
3617 * Called with interrupts off.
3618 */
3619static void
3620setjobctl(int on)
3621{
3622 int fd;
3623 int pgrp;
3624
Denis Vlasenkob07a4962008-06-22 13:16:23 +00003625 if (on == doing_jobctl || rootshell == 0)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003626 return;
3627 if (on) {
3628 int ofd;
3629 ofd = fd = open(_PATH_TTY, O_RDWR);
3630 if (fd < 0) {
3631 /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
3632 * That sometimes helps to acquire controlling tty.
3633 * Obviously, a workaround for bugs when someone
3634 * failed to provide a controlling tty to bash! :) */
Denis Vlasenkoed270a52007-11-26 05:37:07 +00003635 fd = 2;
3636 while (!isatty(fd))
3637 if (--fd < 0)
3638 goto out;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003639 }
3640 fd = fcntl(fd, F_DUPFD, 10);
Denis Vlasenkoed270a52007-11-26 05:37:07 +00003641 if (ofd >= 0)
3642 close(ofd);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003643 if (fd < 0)
3644 goto out;
Denis Vlasenkoed270a52007-11-26 05:37:07 +00003645 /* fd is a tty at this point */
Denis Vlasenko96e1b382007-09-30 23:50:48 +00003646 close_on_exec_on(fd);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003647 do { /* while we are in the background */
3648 pgrp = tcgetpgrp(fd);
3649 if (pgrp < 0) {
3650 out:
3651 ash_msg("can't access tty; job control turned off");
3652 mflag = on = 0;
3653 goto close;
3654 }
3655 if (pgrp == getpgrp())
3656 break;
3657 killpg(0, SIGTTIN);
3658 } while (1);
3659 initialpgrp = pgrp;
3660
3661 setsignal(SIGTSTP);
3662 setsignal(SIGTTOU);
3663 setsignal(SIGTTIN);
3664 pgrp = rootpid;
3665 setpgid(0, pgrp);
3666 xtcsetpgrp(fd, pgrp);
3667 } else {
3668 /* turning job control off */
3669 fd = ttyfd;
3670 pgrp = initialpgrp;
Denis Vlasenko08c8c1d2007-04-28 22:39:02 +00003671 /* was xtcsetpgrp, but this can make exiting ash
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00003672 * loop forever if pty is already deleted */
Denis Vlasenko08c8c1d2007-04-28 22:39:02 +00003673 tcsetpgrp(fd, pgrp);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003674 setpgid(0, pgrp);
3675 setsignal(SIGTSTP);
3676 setsignal(SIGTTOU);
3677 setsignal(SIGTTIN);
3678 close:
Denis Vlasenkoed270a52007-11-26 05:37:07 +00003679 if (fd >= 0)
3680 close(fd);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003681 fd = -1;
3682 }
3683 ttyfd = fd;
Denis Vlasenkob07a4962008-06-22 13:16:23 +00003684 doing_jobctl = on;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003685}
3686
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02003687static int FAST_FUNC
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003688killcmd(int argc, char **argv)
3689{
Denis Vlasenko68404f12008-03-17 09:00:54 +00003690 int i = 1;
Denis Vlasenkof20de5b2007-04-29 23:42:54 +00003691 if (argv[1] && strcmp(argv[1], "-l") != 0) {
Denis Vlasenkof20de5b2007-04-29 23:42:54 +00003692 do {
3693 if (argv[i][0] == '%') {
3694 struct job *jp = getjob(argv[i], 0);
3695 unsigned pid = jp->ps[0].pid;
3696 /* Enough space for ' -NNN<nul>' */
3697 argv[i] = alloca(sizeof(int)*3 + 3);
3698 /* kill_main has matching code to expect
3699 * leading space. Needed to not confuse
3700 * negative pids with "kill -SIGNAL_NO" syntax */
3701 sprintf(argv[i], " -%u", pid);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003702 }
Denis Vlasenkof20de5b2007-04-29 23:42:54 +00003703 } while (argv[++i]);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003704 }
Denis Vlasenkof20de5b2007-04-29 23:42:54 +00003705 return kill_main(argc, argv);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003706}
3707
3708static void
3709showpipe(struct job *jp, FILE *out)
3710{
3711 struct procstat *sp;
3712 struct procstat *spend;
3713
3714 spend = jp->ps + jp->nprocs;
3715 for (sp = jp->ps + 1; sp < spend; sp++)
3716 fprintf(out, " | %s", sp->cmd);
3717 outcslow('\n', out);
3718 flush_stdout_stderr();
3719}
3720
3721
3722static int
3723restartjob(struct job *jp, int mode)
3724{
3725 struct procstat *ps;
3726 int i;
3727 int status;
3728 pid_t pgid;
3729
3730 INT_OFF;
3731 if (jp->state == JOBDONE)
3732 goto out;
3733 jp->state = JOBRUNNING;
3734 pgid = jp->ps->pid;
3735 if (mode == FORK_FG)
3736 xtcsetpgrp(ttyfd, pgid);
3737 killpg(pgid, SIGCONT);
3738 ps = jp->ps;
3739 i = jp->nprocs;
3740 do {
3741 if (WIFSTOPPED(ps->status)) {
3742 ps->status = -1;
3743 }
Denis Vlasenkof20de5b2007-04-29 23:42:54 +00003744 ps++;
3745 } while (--i);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003746 out:
3747 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
3748 INT_ON;
3749 return status;
3750}
3751
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02003752static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00003753fg_bgcmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003754{
3755 struct job *jp;
3756 FILE *out;
3757 int mode;
3758 int retval;
3759
3760 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
3761 nextopt(nullstr);
3762 argv = argptr;
3763 out = stdout;
3764 do {
3765 jp = getjob(*argv, 1);
3766 if (mode == FORK_BG) {
3767 set_curjob(jp, CUR_RUNNING);
3768 fprintf(out, "[%d] ", jobno(jp));
3769 }
3770 outstr(jp->ps->cmd, out);
3771 showpipe(jp, out);
3772 retval = restartjob(jp, mode);
3773 } while (*argv && *++argv);
3774 return retval;
3775}
3776#endif
3777
3778static int
3779sprint_status(char *s, int status, int sigonly)
3780{
3781 int col;
3782 int st;
3783
3784 col = 0;
3785 if (!WIFEXITED(status)) {
3786#if JOBS
3787 if (WIFSTOPPED(status))
3788 st = WSTOPSIG(status);
3789 else
3790#endif
3791 st = WTERMSIG(status);
3792 if (sigonly) {
3793 if (st == SIGINT || st == SIGPIPE)
3794 goto out;
3795#if JOBS
3796 if (WIFSTOPPED(status))
3797 goto out;
3798#endif
3799 }
3800 st &= 0x7f;
3801 col = fmtstr(s, 32, strsignal(st));
3802 if (WCOREDUMP(status)) {
3803 col += fmtstr(s + col, 16, " (core dumped)");
3804 }
3805 } else if (!sigonly) {
3806 st = WEXITSTATUS(status);
3807 if (st)
3808 col = fmtstr(s, 16, "Done(%d)", st);
3809 else
3810 col = fmtstr(s, 16, "Done");
3811 }
3812 out:
3813 return col;
3814}
3815
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003816static int
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00003817dowait(int wait_flags, struct job *job)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003818{
3819 int pid;
3820 int status;
3821 struct job *jp;
3822 struct job *thisjob;
3823 int state;
3824
Denis Vlasenkobe54d6b2008-10-27 14:25:52 +00003825 TRACE(("dowait(0x%x) called\n", wait_flags));
3826
3827 /* Do a wait system call. If job control is compiled in, we accept
3828 * stopped processes. wait_flags may have WNOHANG, preventing blocking.
3829 * NB: _not_ safe_waitpid, we need to detect EINTR */
3830 pid = waitpid(-1, &status,
3831 (doing_jobctl ? (wait_flags | WUNTRACED) : wait_flags));
Denis Vlasenkob21f3792009-03-19 23:09:58 +00003832 TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n",
3833 pid, status, errno, strerror(errno)));
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003834 if (pid <= 0)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003835 return pid;
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003836
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003837 INT_OFF;
3838 thisjob = NULL;
3839 for (jp = curjob; jp; jp = jp->prev_job) {
3840 struct procstat *sp;
3841 struct procstat *spend;
3842 if (jp->state == JOBDONE)
3843 continue;
3844 state = JOBDONE;
3845 spend = jp->ps + jp->nprocs;
3846 sp = jp->ps;
3847 do {
3848 if (sp->pid == pid) {
3849 TRACE(("Job %d: changing status of proc %d "
3850 "from 0x%x to 0x%x\n",
3851 jobno(jp), pid, sp->status, status));
3852 sp->status = status;
3853 thisjob = jp;
3854 }
3855 if (sp->status == -1)
3856 state = JOBRUNNING;
3857#if JOBS
3858 if (state == JOBRUNNING)
3859 continue;
3860 if (WIFSTOPPED(sp->status)) {
3861 jp->stopstatus = sp->status;
3862 state = JOBSTOPPED;
3863 }
3864#endif
3865 } while (++sp < spend);
3866 if (thisjob)
3867 goto gotjob;
3868 }
3869#if JOBS
3870 if (!WIFSTOPPED(status))
3871#endif
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003872 jobless--;
3873 goto out;
3874
3875 gotjob:
3876 if (state != JOBRUNNING) {
3877 thisjob->changed = 1;
3878
3879 if (thisjob->state != state) {
3880 TRACE(("Job %d: changing state from %d to %d\n",
3881 jobno(thisjob), thisjob->state, state));
3882 thisjob->state = state;
3883#if JOBS
3884 if (state == JOBSTOPPED) {
3885 set_curjob(thisjob, CUR_STOPPED);
3886 }
3887#endif
3888 }
3889 }
3890
3891 out:
3892 INT_ON;
3893
3894 if (thisjob && thisjob == job) {
3895 char s[48 + 1];
3896 int len;
3897
3898 len = sprint_status(s, status, 1);
3899 if (len) {
3900 s[len] = '\n';
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00003901 s[len + 1] = '\0';
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003902 out2str(s);
3903 }
3904 }
3905 return pid;
3906}
3907
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003908static int
3909blocking_wait_with_raise_on_sig(struct job *job)
3910{
3911 pid_t pid = dowait(DOWAIT_BLOCK, job);
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02003912 if (pid <= 0 && pending_sig)
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00003913 raise_exception(EXSIG);
3914 return pid;
3915}
3916
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003917#if JOBS
3918static void
3919showjob(FILE *out, struct job *jp, int mode)
3920{
3921 struct procstat *ps;
3922 struct procstat *psend;
3923 int col;
Denis Vlasenko40ba9982007-07-14 00:48:29 +00003924 int indent_col;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003925 char s[80];
3926
3927 ps = jp->ps;
3928
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003929 if (mode & SHOW_ONLY_PGID) { /* jobs -p */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003930 /* just output process (group) id of pipeline */
3931 fprintf(out, "%d\n", ps->pid);
3932 return;
3933 }
3934
3935 col = fmtstr(s, 16, "[%d] ", jobno(jp));
Denis Vlasenko40ba9982007-07-14 00:48:29 +00003936 indent_col = col;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003937
3938 if (jp == curjob)
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003939 s[col - 3] = '+';
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003940 else if (curjob && jp == curjob->prev_job)
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003941 s[col - 3] = '-';
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003942
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003943 if (mode & SHOW_PIDS)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003944 col += fmtstr(s + col, 16, "%d ", ps->pid);
3945
3946 psend = ps + jp->nprocs;
3947
3948 if (jp->state == JOBRUNNING) {
3949 strcpy(s + col, "Running");
3950 col += sizeof("Running") - 1;
3951 } else {
3952 int status = psend[-1].status;
3953 if (jp->state == JOBSTOPPED)
3954 status = jp->stopstatus;
3955 col += sprint_status(s + col, status, 0);
3956 }
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003957 /* By now, "[JOBID]* [maybe PID] STATUS" is printed */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003958
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003959 /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line
3960 * or prints several "PID | <cmdN>" lines,
3961 * depending on SHOW_PIDS bit.
3962 * We do not print status of individual processes
3963 * between PID and <cmdN>. bash does it, but not very well:
3964 * first line shows overall job status, not process status,
3965 * making it impossible to know 1st process status.
3966 */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003967 goto start;
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003968 while (1) {
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003969 /* for each process */
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003970 s[0] = '\0';
3971 col = 33;
3972 if (mode & SHOW_PIDS)
3973 col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->pid) - 1;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003974 start:
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003975 fprintf(out, "%s%*c", s, 33 - col >= 0 ? 33 - col : 0, ' ');
3976 if (ps != jp->ps)
3977 fprintf(out, "| ");
3978 fprintf(out, "%s", ps->cmd);
3979 if (++ps == psend)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003980 break;
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02003981 }
3982 outcslow('\n', out);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003983
3984 jp->changed = 0;
3985
3986 if (jp->state == JOBDONE) {
3987 TRACE(("showjob: freeing job %d\n", jobno(jp)));
3988 freejob(jp);
3989 }
3990}
3991
Denis Vlasenkoa8915072007-02-23 21:10:06 +00003992/*
3993 * Print a list of jobs. If "change" is nonzero, only print jobs whose
3994 * statuses have changed since the last call to showjobs.
3995 */
3996static void
3997showjobs(FILE *out, int mode)
3998{
3999 struct job *jp;
4000
Denys Vlasenko883cea42009-07-11 15:31:59 +02004001 TRACE(("showjobs(0x%x) called\n", mode));
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004002
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004003 /* Handle all finished jobs */
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00004004 while (dowait(DOWAIT_NONBLOCK, NULL) > 0)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004005 continue;
4006
4007 for (jp = curjob; jp; jp = jp->prev_job) {
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004008 if (!(mode & SHOW_CHANGED) || jp->changed) {
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004009 showjob(out, jp, mode);
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004010 }
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004011 }
4012}
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004013
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02004014static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00004015jobscmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004016{
4017 int mode, m;
4018
4019 mode = 0;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02004020 while ((m = nextopt("lp")) != '\0') {
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004021 if (m == 'l')
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02004022 mode |= SHOW_PIDS;
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004023 else
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02004024 mode |= SHOW_ONLY_PGID;
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004025 }
4026
4027 argv = argptr;
4028 if (*argv) {
4029 do
Denys Vlasenkoa12af2d2009-08-23 22:10:04 +02004030 showjob(stdout, getjob(*argv, 0), mode);
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004031 while (*++argv);
4032 } else
4033 showjobs(stdout, mode);
4034
4035 return 0;
4036}
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004037#endif /* JOBS */
4038
4039static int
4040getstatus(struct job *job)
4041{
4042 int status;
4043 int retval;
4044
4045 status = job->ps[job->nprocs - 1].status;
4046 retval = WEXITSTATUS(status);
4047 if (!WIFEXITED(status)) {
4048#if JOBS
4049 retval = WSTOPSIG(status);
4050 if (!WIFSTOPPED(status))
4051#endif
4052 {
4053 /* XXX: limits number of signals */
4054 retval = WTERMSIG(status);
4055#if JOBS
4056 if (retval == SIGINT)
4057 job->sigint = 1;
4058#endif
4059 }
4060 retval += 128;
4061 }
Denys Vlasenko883cea42009-07-11 15:31:59 +02004062 TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n",
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004063 jobno(job), job->nprocs, status, retval));
4064 return retval;
4065}
4066
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02004067static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00004068waitcmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004069{
4070 struct job *job;
4071 int retval;
4072 struct job *jp;
4073
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02004074 if (pending_sig)
Denis Vlasenko991a1da2008-02-10 19:02:53 +00004075 raise_exception(EXSIG);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004076
4077 nextopt(nullstr);
4078 retval = 0;
4079
4080 argv = argptr;
4081 if (!*argv) {
4082 /* wait for all jobs */
4083 for (;;) {
4084 jp = curjob;
4085 while (1) {
Denis Vlasenko991a1da2008-02-10 19:02:53 +00004086 if (!jp) /* no running procs */
4087 goto ret;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004088 if (jp->state == JOBRUNNING)
4089 break;
4090 jp->waited = 1;
4091 jp = jp->prev_job;
4092 }
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004093 /* man bash:
4094 * "When bash is waiting for an asynchronous command via
4095 * the wait builtin, the reception of a signal for which a trap
4096 * has been set will cause the wait builtin to return immediately
4097 * with an exit status greater than 128, immediately after which
4098 * the trap is executed."
4099 * Do we do it that way? */
4100 blocking_wait_with_raise_on_sig(NULL);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004101 }
4102 }
4103
4104 retval = 127;
4105 do {
4106 if (**argv != '%') {
4107 pid_t pid = number(*argv);
4108 job = curjob;
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00004109 while (1) {
4110 if (!job)
4111 goto repeat;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004112 if (job->ps[job->nprocs - 1].pid == pid)
4113 break;
4114 job = job->prev_job;
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00004115 }
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004116 } else
4117 job = getjob(*argv, 0);
4118 /* loop until process terminated or stopped */
4119 while (job->state == JOBRUNNING)
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004120 blocking_wait_with_raise_on_sig(NULL);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004121 job->waited = 1;
4122 retval = getstatus(job);
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004123 repeat: ;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004124 } while (*++argv);
4125
Denis Vlasenko991a1da2008-02-10 19:02:53 +00004126 ret:
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004127 return retval;
4128}
4129
4130static struct job *
4131growjobtab(void)
4132{
4133 size_t len;
4134 ptrdiff_t offset;
4135 struct job *jp, *jq;
4136
4137 len = njobs * sizeof(*jp);
4138 jq = jobtab;
4139 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
4140
4141 offset = (char *)jp - (char *)jq;
4142 if (offset) {
4143 /* Relocate pointers */
4144 size_t l = len;
4145
4146 jq = (struct job *)((char *)jq + l);
4147 while (l) {
4148 l -= sizeof(*jp);
4149 jq--;
4150#define joff(p) ((struct job *)((char *)(p) + l))
4151#define jmove(p) (p) = (void *)((char *)(p) + offset)
4152 if (joff(jp)->ps == &jq->ps0)
4153 jmove(joff(jp)->ps);
4154 if (joff(jp)->prev_job)
4155 jmove(joff(jp)->prev_job);
4156 }
4157 if (curjob)
4158 jmove(curjob);
4159#undef joff
4160#undef jmove
4161 }
4162
4163 njobs += 4;
4164 jobtab = jp;
4165 jp = (struct job *)((char *)jp + len);
4166 jq = jp + 3;
4167 do {
4168 jq->used = 0;
4169 } while (--jq >= jp);
4170 return jp;
4171}
4172
4173/*
4174 * Return a new job structure.
4175 * Called with interrupts off.
4176 */
4177static struct job *
Denis Vlasenko68404f12008-03-17 09:00:54 +00004178makejob(/*union node *node,*/ int nprocs)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004179{
4180 int i;
4181 struct job *jp;
4182
4183 for (i = njobs, jp = jobtab; ; jp++) {
4184 if (--i < 0) {
4185 jp = growjobtab();
4186 break;
4187 }
4188 if (jp->used == 0)
4189 break;
4190 if (jp->state != JOBDONE || !jp->waited)
4191 continue;
4192#if JOBS
Denis Vlasenkob07a4962008-06-22 13:16:23 +00004193 if (doing_jobctl)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004194 continue;
4195#endif
4196 freejob(jp);
4197 break;
4198 }
4199 memset(jp, 0, sizeof(*jp));
4200#if JOBS
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +00004201 /* jp->jobctl is a bitfield.
4202 * "jp->jobctl |= jobctl" likely to give awful code */
Denis Vlasenkob07a4962008-06-22 13:16:23 +00004203 if (doing_jobctl)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004204 jp->jobctl = 1;
4205#endif
4206 jp->prev_job = curjob;
4207 curjob = jp;
4208 jp->used = 1;
4209 jp->ps = &jp->ps0;
4210 if (nprocs > 1) {
4211 jp->ps = ckmalloc(nprocs * sizeof(struct procstat));
4212 }
Denis Vlasenko68404f12008-03-17 09:00:54 +00004213 TRACE(("makejob(%d) returns %%%d\n", nprocs,
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004214 jobno(jp)));
4215 return jp;
4216}
4217
4218#if JOBS
4219/*
4220 * Return a string identifying a command (to be printed by the
4221 * jobs command).
4222 */
4223static char *cmdnextc;
4224
4225static void
4226cmdputs(const char *s)
4227{
Denis Vlasenko92e13c22008-03-25 01:17:40 +00004228 static const char vstype[VSTYPE + 1][3] = {
4229 "", "}", "-", "+", "?", "=",
4230 "%", "%%", "#", "##"
Denis Vlasenko5e34ff22009-04-21 11:09:40 +00004231 IF_ASH_BASH_COMPAT(, ":", "/", "//")
Denis Vlasenko92e13c22008-03-25 01:17:40 +00004232 };
4233
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004234 const char *p, *str;
4235 char c, cc[2] = " ";
4236 char *nextc;
4237 int subtype = 0;
4238 int quoted = 0;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004239
4240 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
4241 p = s;
4242 while ((c = *p++) != 0) {
Denis Vlasenkoef527f52008-06-23 01:52:30 +00004243 str = NULL;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004244 switch (c) {
4245 case CTLESC:
4246 c = *p++;
4247 break;
4248 case CTLVAR:
4249 subtype = *p++;
4250 if ((subtype & VSTYPE) == VSLENGTH)
4251 str = "${#";
4252 else
4253 str = "${";
4254 if (!(subtype & VSQUOTE) == !(quoted & 1))
4255 goto dostr;
4256 quoted ^= 1;
4257 c = '"';
4258 break;
4259 case CTLENDVAR:
4260 str = "\"}" + !(quoted & 1);
4261 quoted >>= 1;
4262 subtype = 0;
4263 goto dostr;
4264 case CTLBACKQ:
4265 str = "$(...)";
4266 goto dostr;
4267 case CTLBACKQ+CTLQUOTE:
4268 str = "\"$(...)\"";
4269 goto dostr;
Mike Frysinger98c52642009-04-02 10:02:37 +00004270#if ENABLE_SH_MATH_SUPPORT
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004271 case CTLARI:
4272 str = "$((";
4273 goto dostr;
4274 case CTLENDARI:
4275 str = "))";
4276 goto dostr;
4277#endif
4278 case CTLQUOTEMARK:
4279 quoted ^= 1;
4280 c = '"';
4281 break;
4282 case '=':
4283 if (subtype == 0)
4284 break;
4285 if ((subtype & VSTYPE) != VSNORMAL)
4286 quoted <<= 1;
4287 str = vstype[subtype & VSTYPE];
4288 if (subtype & VSNUL)
4289 c = ':';
4290 else
4291 goto checkstr;
4292 break;
4293 case '\'':
4294 case '\\':
4295 case '"':
4296 case '$':
4297 /* These can only happen inside quotes */
4298 cc[0] = c;
4299 str = cc;
4300 c = '\\';
4301 break;
4302 default:
4303 break;
4304 }
4305 USTPUTC(c, nextc);
4306 checkstr:
4307 if (!str)
4308 continue;
4309 dostr:
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02004310 while ((c = *str++) != '\0') {
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004311 USTPUTC(c, nextc);
4312 }
4313 }
4314 if (quoted & 1) {
4315 USTPUTC('"', nextc);
4316 }
4317 *nextc = 0;
4318 cmdnextc = nextc;
4319}
4320
4321/* cmdtxt() and cmdlist() call each other */
4322static void cmdtxt(union node *n);
4323
4324static void
4325cmdlist(union node *np, int sep)
4326{
4327 for (; np; np = np->narg.next) {
4328 if (!sep)
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00004329 cmdputs(" ");
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004330 cmdtxt(np);
4331 if (sep && np->narg.next)
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00004332 cmdputs(" ");
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004333 }
4334}
4335
4336static void
4337cmdtxt(union node *n)
4338{
4339 union node *np;
4340 struct nodelist *lp;
4341 const char *p;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004342
4343 if (!n)
4344 return;
4345 switch (n->type) {
4346 default:
4347#if DEBUG
4348 abort();
4349#endif
4350 case NPIPE:
4351 lp = n->npipe.cmdlist;
4352 for (;;) {
4353 cmdtxt(lp->n);
4354 lp = lp->next;
4355 if (!lp)
4356 break;
4357 cmdputs(" | ");
4358 }
4359 break;
4360 case NSEMI:
4361 p = "; ";
4362 goto binop;
4363 case NAND:
4364 p = " && ";
4365 goto binop;
4366 case NOR:
4367 p = " || ";
4368 binop:
4369 cmdtxt(n->nbinary.ch1);
4370 cmdputs(p);
4371 n = n->nbinary.ch2;
4372 goto donode;
4373 case NREDIR:
4374 case NBACKGND:
4375 n = n->nredir.n;
4376 goto donode;
4377 case NNOT:
4378 cmdputs("!");
4379 n = n->nnot.com;
4380 donode:
4381 cmdtxt(n);
4382 break;
4383 case NIF:
4384 cmdputs("if ");
4385 cmdtxt(n->nif.test);
4386 cmdputs("; then ");
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004387 if (n->nif.elsepart) {
Denys Vlasenko7cee00e2009-07-24 01:08:03 +02004388 cmdtxt(n->nif.ifpart);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004389 cmdputs("; else ");
4390 n = n->nif.elsepart;
Denys Vlasenko7cee00e2009-07-24 01:08:03 +02004391 } else {
4392 n = n->nif.ifpart;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004393 }
4394 p = "; fi";
4395 goto dotail;
4396 case NSUBSHELL:
4397 cmdputs("(");
4398 n = n->nredir.n;
4399 p = ")";
4400 goto dotail;
4401 case NWHILE:
4402 p = "while ";
4403 goto until;
4404 case NUNTIL:
4405 p = "until ";
4406 until:
4407 cmdputs(p);
4408 cmdtxt(n->nbinary.ch1);
4409 n = n->nbinary.ch2;
4410 p = "; done";
4411 dodo:
4412 cmdputs("; do ");
4413 dotail:
4414 cmdtxt(n);
4415 goto dotail2;
4416 case NFOR:
4417 cmdputs("for ");
4418 cmdputs(n->nfor.var);
4419 cmdputs(" in ");
4420 cmdlist(n->nfor.args, 1);
4421 n = n->nfor.body;
4422 p = "; done";
4423 goto dodo;
4424 case NDEFUN:
4425 cmdputs(n->narg.text);
4426 p = "() { ... }";
4427 goto dotail2;
4428 case NCMD:
4429 cmdlist(n->ncmd.args, 1);
4430 cmdlist(n->ncmd.redirect, 0);
4431 break;
4432 case NARG:
4433 p = n->narg.text;
4434 dotail2:
4435 cmdputs(p);
4436 break;
4437 case NHERE:
4438 case NXHERE:
4439 p = "<<...";
4440 goto dotail2;
4441 case NCASE:
4442 cmdputs("case ");
4443 cmdputs(n->ncase.expr->narg.text);
4444 cmdputs(" in ");
4445 for (np = n->ncase.cases; np; np = np->nclist.next) {
4446 cmdtxt(np->nclist.pattern);
4447 cmdputs(") ");
4448 cmdtxt(np->nclist.body);
4449 cmdputs(";; ");
4450 }
4451 p = "esac";
4452 goto dotail2;
4453 case NTO:
4454 p = ">";
4455 goto redir;
4456 case NCLOBBER:
4457 p = ">|";
4458 goto redir;
4459 case NAPPEND:
4460 p = ">>";
4461 goto redir;
Denis Vlasenko559691a2008-10-05 18:39:31 +00004462#if ENABLE_ASH_BASH_COMPAT
4463 case NTO2:
4464#endif
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004465 case NTOFD:
4466 p = ">&";
4467 goto redir;
4468 case NFROM:
4469 p = "<";
4470 goto redir;
4471 case NFROMFD:
4472 p = "<&";
4473 goto redir;
4474 case NFROMTO:
4475 p = "<>";
4476 redir:
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00004477 cmdputs(utoa(n->nfile.fd));
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004478 cmdputs(p);
4479 if (n->type == NTOFD || n->type == NFROMFD) {
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00004480 cmdputs(utoa(n->ndup.dupfd));
4481 break;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004482 }
4483 n = n->nfile.fname;
4484 goto donode;
4485 }
4486}
4487
4488static char *
4489commandtext(union node *n)
4490{
4491 char *name;
4492
4493 STARTSTACKSTR(cmdnextc);
4494 cmdtxt(n);
4495 name = stackblock();
4496 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
4497 name, cmdnextc, cmdnextc));
4498 return ckstrdup(name);
4499}
4500#endif /* JOBS */
4501
4502/*
4503 * Fork off a subshell. If we are doing job control, give the subshell its
4504 * own process group. Jp is a job structure that the job is to be added to.
4505 * N is the command that will be evaluated by the child. Both jp and n may
4506 * be NULL. The mode parameter can be one of the following:
4507 * FORK_FG - Fork off a foreground process.
4508 * FORK_BG - Fork off a background process.
4509 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
4510 * process group even if job control is on.
4511 *
4512 * When job control is turned off, background processes have their standard
4513 * input redirected to /dev/null (except for the second and later processes
4514 * in a pipeline).
4515 *
4516 * Called with interrupts off.
4517 */
4518/*
4519 * Clear traps on a fork.
4520 */
4521static void
4522clear_traps(void)
4523{
4524 char **tp;
4525
4526 for (tp = trap; tp < &trap[NSIG]; tp++) {
Denis Vlasenko991a1da2008-02-10 19:02:53 +00004527 if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004528 INT_OFF;
Denys Vlasenkoe305c282009-09-25 02:12:27 +02004529 if (trap_ptr == trap)
4530 free(*tp);
4531 /* else: it "belongs" to trap_ptr vector, don't free */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004532 *tp = NULL;
Denys Vlasenko0800e3a2009-09-24 03:09:26 +02004533 if ((tp - trap) != 0)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004534 setsignal(tp - trap);
4535 INT_ON;
4536 }
4537 }
4538}
Denis Vlasenkobdc406d2007-07-15 01:13:25 +00004539
4540/* Lives far away from here, needed for forkchild */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004541static void closescript(void);
Denis Vlasenko41770222007-10-07 18:02:52 +00004542
Denis Vlasenkobdc406d2007-07-15 01:13:25 +00004543/* Called after fork(), in child */
Denys Vlasenkoe56f22a2009-07-24 00:16:59 +02004544#if !JOBS
4545# define forkchild(jp, n, mode) forkchild(jp, mode)
4546#endif
Denys Vlasenko21d87d42009-09-25 00:06:51 +02004547static NOINLINE void
Denys Vlasenkoe56f22a2009-07-24 00:16:59 +02004548forkchild(struct job *jp, union node *n, int mode)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004549{
4550 int oldlvl;
4551
4552 TRACE(("Child shell %d\n", getpid()));
4553 oldlvl = shlvl;
4554 shlvl++;
4555
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004556 /* man bash: "Non-builtin commands run by bash have signal handlers
4557 * set to the values inherited by the shell from its parent".
4558 * Do we do it correctly? */
4559
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004560 closescript();
Denys Vlasenko844f9902009-09-23 03:25:52 +02004561
4562 if (mode == FORK_NOJOB /* is it `xxx` ? */
4563 && n && n->type == NCMD /* is it single cmd? */
4564 /* && n->ncmd.args->type == NARG - always true? */
4565 && strcmp(n->ncmd.args->narg.text, "trap") == 0
4566 && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */
4567 /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */
4568 ) {
4569 TRACE(("Trap hack\n"));
4570 /* Awful hack for `trap` or $(trap).
4571 *
4572 * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html
4573 * contains an example where "trap" is executed in a subshell:
4574 *
4575 * save_traps=$(trap)
4576 * ...
4577 * eval "$save_traps"
4578 *
4579 * Standard does not say that "trap" in subshell shall print
4580 * parent shell's traps. It only says that its output
4581 * must have suitable form, but then, in the above example
4582 * (which is not supposed to be normative), it implies that.
4583 *
4584 * bash (and probably other shell) does implement it
4585 * (traps are reset to defaults, but "trap" still shows them),
4586 * but as a result, "trap" logic is hopelessly messed up:
4587 *
4588 * # trap
4589 * trap -- 'echo Ho' SIGWINCH <--- we have a handler
4590 * # (trap) <--- trap is in subshell - no output (correct, traps are reset)
4591 * # true | trap <--- trap is in subshell - no output (ditto)
4592 * # echo `true | trap` <--- in subshell - output (but traps are reset!)
4593 * trap -- 'echo Ho' SIGWINCH
4594 * # echo `(trap)` <--- in subshell in subshell - output
4595 * trap -- 'echo Ho' SIGWINCH
4596 * # echo `true | (trap)` <--- in subshell in subshell in subshell - output!
4597 * trap -- 'echo Ho' SIGWINCH
4598 *
4599 * The rules when to forget and when to not forget traps
4600 * get really complex and nonsensical.
4601 *
4602 * Our solution: ONLY bare $(trap) or `trap` is special.
4603 */
Denys Vlasenko8f88d852009-09-25 12:12:53 +02004604 /* Save trap handler strings for trap builtin to print */
Denys Vlasenko21d87d42009-09-25 00:06:51 +02004605 trap_ptr = memcpy(xmalloc(sizeof(trap)), trap, sizeof(trap));
Denys Vlasenko8f88d852009-09-25 12:12:53 +02004606 /* Fall through into clearing traps */
Denys Vlasenko844f9902009-09-23 03:25:52 +02004607 }
Denys Vlasenkoe305c282009-09-25 02:12:27 +02004608 clear_traps();
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004609#if JOBS
4610 /* do job control only in root shell */
Denis Vlasenkob07a4962008-06-22 13:16:23 +00004611 doing_jobctl = 0;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004612 if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
4613 pid_t pgrp;
4614
4615 if (jp->nprocs == 0)
4616 pgrp = getpid();
4617 else
4618 pgrp = jp->ps[0].pid;
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004619 /* this can fail because we are doing it in the parent also */
4620 setpgid(0, pgrp);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004621 if (mode == FORK_FG)
4622 xtcsetpgrp(ttyfd, pgrp);
4623 setsignal(SIGTSTP);
4624 setsignal(SIGTTOU);
4625 } else
4626#endif
4627 if (mode == FORK_BG) {
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004628 /* man bash: "When job control is not in effect,
4629 * asynchronous commands ignore SIGINT and SIGQUIT" */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004630 ignoresig(SIGINT);
4631 ignoresig(SIGQUIT);
4632 if (jp->nprocs == 0) {
4633 close(0);
4634 if (open(bb_dev_null, O_RDONLY) != 0)
Denis Vlasenko9604e1b2009-03-03 18:47:56 +00004635 ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004636 }
4637 }
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004638 if (!oldlvl) {
4639 if (iflag) { /* why if iflag only? */
4640 setsignal(SIGINT);
4641 setsignal(SIGTERM);
4642 }
4643 /* man bash:
4644 * "In all cases, bash ignores SIGQUIT. Non-builtin
4645 * commands run by bash have signal handlers
4646 * set to the values inherited by the shell
4647 * from its parent".
4648 * Take care of the second rule: */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004649 setsignal(SIGQUIT);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004650 }
Denys Vlasenkoe56f22a2009-07-24 00:16:59 +02004651#if JOBS
Denys Vlasenko844f9902009-09-23 03:25:52 +02004652 if (n && n->type == NCMD
4653 && strcmp(n->ncmd.args->narg.text, "jobs") == 0
4654 ) {
Denys Vlasenkoe56f22a2009-07-24 00:16:59 +02004655 TRACE(("Job hack\n"));
Denys Vlasenko844f9902009-09-23 03:25:52 +02004656 /* "jobs": we do not want to clear job list for it,
4657 * instead we remove only _its_ own_ job from job list.
4658 * This makes "jobs .... | cat" more useful.
4659 */
Denys Vlasenkoe56f22a2009-07-24 00:16:59 +02004660 freejob(curjob);
4661 return;
4662 }
4663#endif
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004664 for (jp = curjob; jp; jp = jp->prev_job)
4665 freejob(jp);
4666 jobless = 0;
4667}
4668
Denis Vlasenkobdc406d2007-07-15 01:13:25 +00004669/* Called after fork(), in parent */
Denis Vlasenko85c24712008-03-17 09:04:04 +00004670#if !JOBS
4671#define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid)
4672#endif
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004673static void
4674forkparent(struct job *jp, union node *n, int mode, pid_t pid)
4675{
4676 TRACE(("In parent shell: child = %d\n", pid));
4677 if (!jp) {
Denis Vlasenko36fc3cd2008-01-29 09:23:49 +00004678 while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0)
4679 continue;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004680 jobless++;
4681 return;
4682 }
4683#if JOBS
4684 if (mode != FORK_NOJOB && jp->jobctl) {
4685 int pgrp;
4686
4687 if (jp->nprocs == 0)
4688 pgrp = pid;
4689 else
4690 pgrp = jp->ps[0].pid;
4691 /* This can fail because we are doing it in the child also */
4692 setpgid(pid, pgrp);
4693 }
4694#endif
4695 if (mode == FORK_BG) {
4696 backgndpid = pid; /* set $! */
4697 set_curjob(jp, CUR_RUNNING);
4698 }
4699 if (jp) {
4700 struct procstat *ps = &jp->ps[jp->nprocs++];
4701 ps->pid = pid;
4702 ps->status = -1;
4703 ps->cmd = nullstr;
4704#if JOBS
Denis Vlasenkob07a4962008-06-22 13:16:23 +00004705 if (doing_jobctl && n)
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004706 ps->cmd = commandtext(n);
4707#endif
4708 }
4709}
4710
4711static int
4712forkshell(struct job *jp, union node *n, int mode)
4713{
4714 int pid;
4715
4716 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
4717 pid = fork();
4718 if (pid < 0) {
4719 TRACE(("Fork failed, errno=%d", errno));
4720 if (jp)
4721 freejob(jp);
Denis Vlasenkofa0b56d2008-07-01 16:09:07 +00004722 ash_msg_and_raise_error("can't fork");
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004723 }
4724 if (pid == 0)
Denys Vlasenkoe56f22a2009-07-24 00:16:59 +02004725 forkchild(jp, n, mode);
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004726 else
4727 forkparent(jp, n, mode, pid);
4728 return pid;
4729}
4730
4731/*
4732 * Wait for job to finish.
4733 *
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004734 * Under job control we have the problem that while a child process
4735 * is running interrupts generated by the user are sent to the child
4736 * but not to the shell. This means that an infinite loop started by
4737 * an interactive user may be hard to kill. With job control turned off,
4738 * an interactive user may place an interactive program inside a loop.
4739 * If the interactive program catches interrupts, the user doesn't want
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004740 * these interrupts to also abort the loop. The approach we take here
4741 * is to have the shell ignore interrupt signals while waiting for a
4742 * foreground process to terminate, and then send itself an interrupt
4743 * signal if the child process was terminated by an interrupt signal.
4744 * Unfortunately, some programs want to do a bit of cleanup and then
4745 * exit on interrupt; unless these processes terminate themselves by
4746 * sending a signal to themselves (instead of calling exit) they will
4747 * confuse this approach.
4748 *
4749 * Called with interrupts off.
4750 */
4751static int
4752waitforjob(struct job *jp)
4753{
4754 int st;
4755
4756 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004757
4758 INT_OFF;
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004759 while (jp->state == JOBRUNNING) {
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004760 /* In non-interactive shells, we _can_ get
4761 * a keyboard signal here and be EINTRed,
4762 * but we just loop back, waiting for command to complete.
4763 *
4764 * man bash:
4765 * "If bash is waiting for a command to complete and receives
4766 * a signal for which a trap has been set, the trap
4767 * will not be executed until the command completes."
4768 *
4769 * Reality is that even if trap is not set, bash
4770 * will not act on the signal until command completes.
4771 * Try this. sleep5intoff.c:
4772 * #include <signal.h>
4773 * #include <unistd.h>
4774 * int main() {
4775 * sigset_t set;
4776 * sigemptyset(&set);
4777 * sigaddset(&set, SIGINT);
4778 * sigaddset(&set, SIGQUIT);
4779 * sigprocmask(SIG_BLOCK, &set, NULL);
4780 * sleep(5);
4781 * return 0;
4782 * }
4783 * $ bash -c './sleep5intoff; echo hi'
4784 * ^C^C^C^C <--- pressing ^C once a second
4785 * $ _
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004786 * $ bash -c './sleep5intoff; echo hi'
4787 * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT)
4788 * $ _
4789 */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004790 dowait(DOWAIT_BLOCK, jp);
4791 }
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004792 INT_ON;
4793
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004794 st = getstatus(jp);
4795#if JOBS
4796 if (jp->jobctl) {
4797 xtcsetpgrp(ttyfd, rootpid);
4798 /*
4799 * This is truly gross.
4800 * If we're doing job control, then we did a TIOCSPGRP which
4801 * caused us (the shell) to no longer be in the controlling
4802 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
4803 * intuit from the subprocess exit status whether a SIGINT
4804 * occurred, and if so interrupt ourselves. Yuck. - mycroft
4805 */
Denis Vlasenko991a1da2008-02-10 19:02:53 +00004806 if (jp->sigint) /* TODO: do the same with all signals */
4807 raise(SIGINT); /* ... by raise(jp->sig) instead? */
Denis Vlasenkoa8915072007-02-23 21:10:06 +00004808 }
4809 if (jp->state == JOBDONE)
4810#endif
4811 freejob(jp);
4812 return st;
4813}
4814
4815/*
4816 * return 1 if there are stopped jobs, otherwise 0
4817 */
4818static int
4819stoppedjobs(void)
4820{
4821 struct job *jp;
4822 int retval;
4823
4824 retval = 0;
4825 if (job_warning)
4826 goto out;
4827 jp = curjob;
4828 if (jp && jp->state == JOBSTOPPED) {
4829 out2str("You have stopped jobs.\n");
4830 job_warning = 2;
4831 retval++;
4832 }
4833 out:
4834 return retval;
4835}
4836
4837
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004838/* ============ redir.c
4839 *
4840 * Code for dealing with input/output redirection.
4841 */
4842
4843#define EMPTY -2 /* marks an unused slot in redirtab */
Denis Vlasenko7d75a962007-11-22 08:16:57 +00004844#define CLOSED -3 /* marks a slot of previously-closed fd */
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004845
4846/*
4847 * Open a file in noclobber mode.
4848 * The code was copied from bash.
4849 */
4850static int
4851noclobberopen(const char *fname)
4852{
4853 int r, fd;
4854 struct stat finfo, finfo2;
4855
4856 /*
4857 * If the file exists and is a regular file, return an error
4858 * immediately.
4859 */
4860 r = stat(fname, &finfo);
4861 if (r == 0 && S_ISREG(finfo.st_mode)) {
4862 errno = EEXIST;
4863 return -1;
4864 }
4865
4866 /*
4867 * If the file was not present (r != 0), make sure we open it
4868 * exclusively so that if it is created before we open it, our open
4869 * will fail. Make sure that we do not truncate an existing file.
4870 * Note that we don't turn on O_EXCL unless the stat failed -- if the
4871 * file was not a regular file, we leave O_EXCL off.
4872 */
4873 if (r != 0)
4874 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
4875 fd = open(fname, O_WRONLY|O_CREAT, 0666);
4876
4877 /* If the open failed, return the file descriptor right away. */
4878 if (fd < 0)
4879 return fd;
4880
4881 /*
4882 * OK, the open succeeded, but the file may have been changed from a
4883 * non-regular file to a regular file between the stat and the open.
4884 * We are assuming that the O_EXCL open handles the case where FILENAME
4885 * did not exist and is symlinked to an existing file between the stat
4886 * and open.
4887 */
4888
4889 /*
4890 * If we can open it and fstat the file descriptor, and neither check
4891 * revealed that it was a regular file, and the file has not been
4892 * replaced, return the file descriptor.
4893 */
4894 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode)
4895 && finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
4896 return fd;
4897
4898 /* The file has been replaced. badness. */
4899 close(fd);
4900 errno = EEXIST;
4901 return -1;
4902}
4903
4904/*
4905 * Handle here documents. Normally we fork off a process to write the
4906 * data to a pipe. If the document is short, we can stuff the data in
4907 * the pipe without forking.
4908 */
4909/* openhere needs this forward reference */
4910static void expandhere(union node *arg, int fd);
4911static int
4912openhere(union node *redir)
4913{
4914 int pip[2];
4915 size_t len = 0;
4916
4917 if (pipe(pip) < 0)
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +00004918 ash_msg_and_raise_error("pipe call failed");
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004919 if (redir->type == NHERE) {
4920 len = strlen(redir->nhere.doc->narg.text);
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00004921 if (len <= PIPE_BUF) {
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004922 full_write(pip[1], redir->nhere.doc->narg.text, len);
4923 goto out;
4924 }
4925 }
4926 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
Denis Vlasenko0b769642008-07-24 07:54:57 +00004927 /* child */
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004928 close(pip[0]);
Denis Vlasenkof8535cc2008-12-03 10:36:26 +00004929 ignoresig(SIGINT); //signal(SIGINT, SIG_IGN);
4930 ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN);
4931 ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN);
4932 ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004933 signal(SIGPIPE, SIG_DFL);
4934 if (redir->type == NHERE)
4935 full_write(pip[1], redir->nhere.doc->narg.text, len);
Denis Vlasenko0b769642008-07-24 07:54:57 +00004936 else /* NXHERE */
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004937 expandhere(redir->nhere.doc, pip[1]);
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +00004938 _exit(EXIT_SUCCESS);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004939 }
4940 out:
4941 close(pip[1]);
4942 return pip[0];
4943}
4944
4945static int
4946openredirect(union node *redir)
4947{
4948 char *fname;
4949 int f;
4950
4951 switch (redir->nfile.type) {
4952 case NFROM:
4953 fname = redir->nfile.expfname;
4954 f = open(fname, O_RDONLY);
4955 if (f < 0)
4956 goto eopen;
4957 break;
4958 case NFROMTO:
4959 fname = redir->nfile.expfname;
4960 f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666);
4961 if (f < 0)
4962 goto ecreate;
4963 break;
4964 case NTO:
Denis Vlasenko559691a2008-10-05 18:39:31 +00004965#if ENABLE_ASH_BASH_COMPAT
4966 case NTO2:
4967#endif
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004968 /* Take care of noclobber mode. */
4969 if (Cflag) {
4970 fname = redir->nfile.expfname;
4971 f = noclobberopen(fname);
4972 if (f < 0)
4973 goto ecreate;
4974 break;
4975 }
4976 /* FALLTHROUGH */
4977 case NCLOBBER:
4978 fname = redir->nfile.expfname;
4979 f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
4980 if (f < 0)
4981 goto ecreate;
4982 break;
4983 case NAPPEND:
4984 fname = redir->nfile.expfname;
4985 f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
4986 if (f < 0)
4987 goto ecreate;
4988 break;
4989 default:
4990#if DEBUG
4991 abort();
4992#endif
4993 /* Fall through to eliminate warning. */
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00004994/* Our single caller does this itself */
Denis Vlasenko0b769642008-07-24 07:54:57 +00004995// case NTOFD:
4996// case NFROMFD:
4997// f = -1;
4998// break;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00004999 case NHERE:
5000 case NXHERE:
5001 f = openhere(redir);
5002 break;
5003 }
5004
5005 return f;
5006 ecreate:
Bernhard Reutner-Fischera53de7f2008-07-21 13:46:54 +00005007 ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory"));
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005008 eopen:
Bernhard Reutner-Fischera53de7f2008-07-21 13:46:54 +00005009 ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file"));
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005010}
5011
5012/*
5013 * Copy a file descriptor to be >= to. Returns -1
5014 * if the source file descriptor is closed, EMPTY if there are no unused
5015 * file descriptors left.
5016 */
Denis Vlasenko5a867312008-07-24 19:46:38 +00005017/* 0x800..00: bit to set in "to" to request dup2 instead of fcntl(F_DUPFD).
5018 * old code was doing close(to) prior to copyfd() to achieve the same */
Denis Vlasenko22f74142008-07-24 22:34:43 +00005019enum {
5020 COPYFD_EXACT = (int)~(INT_MAX),
5021 COPYFD_RESTORE = (int)((unsigned)COPYFD_EXACT >> 1),
5022};
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005023static int
5024copyfd(int from, int to)
5025{
5026 int newfd;
5027
Denis Vlasenko5a867312008-07-24 19:46:38 +00005028 if (to & COPYFD_EXACT) {
5029 to &= ~COPYFD_EXACT;
5030 /*if (from != to)*/
5031 newfd = dup2(from, to);
5032 } else {
5033 newfd = fcntl(from, F_DUPFD, to);
5034 }
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005035 if (newfd < 0) {
5036 if (errno == EMFILE)
5037 return EMPTY;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005038 /* Happens when source fd is not open: try "echo >&99" */
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005039 ash_msg_and_raise_error("%d: %m", from);
5040 }
5041 return newfd;
5042}
5043
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005044/* Struct def and variable are moved down to the first usage site */
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005045struct two_fd_t {
5046 int orig, copy;
5047};
Denis Vlasenko0b769642008-07-24 07:54:57 +00005048struct redirtab {
5049 struct redirtab *next;
Denis Vlasenko0b769642008-07-24 07:54:57 +00005050 int nullredirs;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005051 int pair_count;
Denys Vlasenko606291b2009-09-23 23:15:43 +02005052 struct two_fd_t two_fd[];
Denis Vlasenko0b769642008-07-24 07:54:57 +00005053};
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005054#define redirlist (G_var.redirlist)
Denis Vlasenko0b769642008-07-24 07:54:57 +00005055
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005056static int need_to_remember(struct redirtab *rp, int fd)
5057{
5058 int i;
5059
Denis Vlasenko6a0ad252008-07-25 13:34:05 +00005060 if (!rp) /* remembering was not requested */
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005061 return 0;
5062
5063 for (i = 0; i < rp->pair_count; i++) {
5064 if (rp->two_fd[i].orig == fd) {
5065 /* already remembered */
5066 return 0;
5067 }
5068 }
5069 return 1;
5070}
5071
Denis Vlasenko6a0ad252008-07-25 13:34:05 +00005072/* "hidden" fd is a fd used to read scripts, or a copy of such */
5073static int is_hidden_fd(struct redirtab *rp, int fd)
5074{
5075 int i;
Denis Vlasenko34c73c42008-08-16 11:48:02 +00005076 struct parsefile *pf;
5077
5078 if (fd == -1)
5079 return 0;
5080 pf = g_parsefile;
Denis Vlasenko6a0ad252008-07-25 13:34:05 +00005081 while (pf) {
5082 if (fd == pf->fd) {
5083 return 1;
5084 }
5085 pf = pf->prev;
5086 }
5087 if (!rp)
5088 return 0;
5089 fd |= COPYFD_RESTORE;
5090 for (i = 0; i < rp->pair_count; i++) {
5091 if (rp->two_fd[i].copy == fd) {
5092 return 1;
5093 }
5094 }
5095 return 0;
5096}
5097
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005098/*
5099 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
5100 * old file descriptors are stashed away so that the redirection can be
5101 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
5102 * standard output, and the standard error if it becomes a duplicate of
5103 * stdout, is saved in memory.
5104 */
5105/* flags passed to redirect */
5106#define REDIR_PUSH 01 /* save previous values of file descriptors */
5107#define REDIR_SAVEFD2 03 /* set preverrout */
5108static void
5109redirect(union node *redir, int flags)
5110{
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005111 struct redirtab *sv;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005112 int sv_pos;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005113 int i;
5114 int fd;
5115 int newfd;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005116 int copied_fd2 = -1;
Denis Vlasenko7d75a962007-11-22 08:16:57 +00005117
Denis Vlasenko01631112007-12-16 17:20:38 +00005118 g_nullredirs++;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005119 if (!redir) {
5120 return;
5121 }
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005122
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005123 sv = NULL;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005124 sv_pos = 0;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005125 INT_OFF;
5126 if (flags & REDIR_PUSH) {
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005127 union node *tmp = redir;
5128 do {
5129 sv_pos++;
Denis Vlasenko559691a2008-10-05 18:39:31 +00005130#if ENABLE_ASH_BASH_COMPAT
5131 if (redir->nfile.type == NTO2)
5132 sv_pos++;
5133#endif
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005134 tmp = tmp->nfile.next;
5135 } while (tmp);
5136 sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0]));
Denis Vlasenko7d75a962007-11-22 08:16:57 +00005137 sv->next = redirlist;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005138 sv->pair_count = sv_pos;
Denis Vlasenko7d75a962007-11-22 08:16:57 +00005139 redirlist = sv;
Denis Vlasenko01631112007-12-16 17:20:38 +00005140 sv->nullredirs = g_nullredirs - 1;
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005141 g_nullredirs = 0;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005142 while (sv_pos > 0) {
5143 sv_pos--;
5144 sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY;
5145 }
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005146 }
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005147
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005148 do {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00005149 fd = redir->nfile.fd;
Denis Vlasenko0b769642008-07-24 07:54:57 +00005150 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
Denis Vlasenko6a0ad252008-07-25 13:34:05 +00005151 int right_fd = redir->ndup.dupfd;
5152 /* redirect from/to same file descriptor? */
5153 if (right_fd == fd)
5154 continue;
5155 /* echo >&10 and 10 is a fd opened to the sh script? */
5156 if (is_hidden_fd(sv, right_fd)) {
5157 errno = EBADF; /* as if it is closed */
5158 ash_msg_and_raise_error("%d: %m", right_fd);
5159 }
Denis Vlasenko0b769642008-07-24 07:54:57 +00005160 newfd = -1;
5161 } else {
5162 newfd = openredirect(redir); /* always >= 0 */
5163 if (fd == newfd) {
5164 /* Descriptor wasn't open before redirect.
5165 * Mark it for close in the future */
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005166 if (need_to_remember(sv, fd)) {
Denis Vlasenko5a867312008-07-24 19:46:38 +00005167 goto remember_to_close;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005168 }
Denis Vlasenko0b769642008-07-24 07:54:57 +00005169 continue;
5170 }
Denis Vlasenko7d75a962007-11-22 08:16:57 +00005171 }
Denis Vlasenko559691a2008-10-05 18:39:31 +00005172#if ENABLE_ASH_BASH_COMPAT
5173 redirect_more:
5174#endif
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005175 if (need_to_remember(sv, fd)) {
Denis Vlasenko0b769642008-07-24 07:54:57 +00005176 /* Copy old descriptor */
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005177 i = fcntl(fd, F_DUPFD, 10);
Denis Vlasenko5a867312008-07-24 19:46:38 +00005178/* You'd expect copy to be CLOEXECed. Currently these extra "saved" fds
5179 * are closed in popredir() in the child, preventing them from leaking
5180 * into child. (popredir() also cleans up the mess in case of failures)
5181 */
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005182 if (i == -1) {
5183 i = errno;
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005184 if (i != EBADF) {
5185 /* Strange error (e.g. "too many files" EMFILE?) */
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005186 if (newfd >= 0)
5187 close(newfd);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005188 errno = i;
5189 ash_msg_and_raise_error("%d: %m", fd);
5190 /* NOTREACHED */
5191 }
Denis Vlasenko5a867312008-07-24 19:46:38 +00005192 /* EBADF: it is not open - good, remember to close it */
5193 remember_to_close:
5194 i = CLOSED;
Denis Vlasenko22f74142008-07-24 22:34:43 +00005195 } else { /* fd is open, save its copy */
5196 /* "exec fd>&-" should not close fds
5197 * which point to script file(s).
5198 * Force them to be restored afterwards */
Denis Vlasenko6a0ad252008-07-25 13:34:05 +00005199 if (is_hidden_fd(sv, fd))
5200 i |= COPYFD_RESTORE;
Denis Vlasenko22f74142008-07-24 22:34:43 +00005201 }
Denis Vlasenko5a867312008-07-24 19:46:38 +00005202 if (fd == 2)
5203 copied_fd2 = i;
5204 sv->two_fd[sv_pos].orig = fd;
5205 sv->two_fd[sv_pos].copy = i;
5206 sv_pos++;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005207 }
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005208 if (newfd < 0) {
5209 /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */
Denis Vlasenko22f74142008-07-24 22:34:43 +00005210 if (redir->ndup.dupfd < 0) { /* "fd>&-" */
Denis Vlasenkob9e70dd2009-03-20 01:24:08 +00005211 /* Don't want to trigger debugging */
5212 if (fd != -1)
5213 close(fd);
Denis Vlasenko5a867312008-07-24 19:46:38 +00005214 } else {
5215 copyfd(redir->ndup.dupfd, fd | COPYFD_EXACT);
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005216 }
Denis Vlasenko5a867312008-07-24 19:46:38 +00005217 } else if (fd != newfd) { /* move newfd to fd */
5218 copyfd(newfd, fd | COPYFD_EXACT);
Denis Vlasenko559691a2008-10-05 18:39:31 +00005219#if ENABLE_ASH_BASH_COMPAT
5220 if (!(redir->nfile.type == NTO2 && fd == 2))
5221#endif
5222 close(newfd);
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005223 }
Denis Vlasenko559691a2008-10-05 18:39:31 +00005224#if ENABLE_ASH_BASH_COMPAT
5225 if (redir->nfile.type == NTO2 && fd == 1) {
5226 /* We already redirected it to fd 1, now copy it to 2 */
5227 newfd = 1;
5228 fd = 2;
5229 goto redirect_more;
5230 }
5231#endif
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00005232 } while ((redir = redir->nfile.next) != NULL);
Denis Vlasenko8d924ec2008-07-24 11:34:27 +00005233
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005234 INT_ON;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005235 if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0)
5236 preverrout_fd = copied_fd2;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005237}
5238
5239/*
5240 * Undo the effects of the last redirection.
5241 */
5242static void
Denis Vlasenko34c73c42008-08-16 11:48:02 +00005243popredir(int drop, int restore)
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005244{
5245 struct redirtab *rp;
5246 int i;
5247
Denis Vlasenko01631112007-12-16 17:20:38 +00005248 if (--g_nullredirs >= 0)
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005249 return;
5250 INT_OFF;
5251 rp = redirlist;
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005252 for (i = 0; i < rp->pair_count; i++) {
5253 int fd = rp->two_fd[i].orig;
Denis Vlasenko22f74142008-07-24 22:34:43 +00005254 int copy = rp->two_fd[i].copy;
5255 if (copy == CLOSED) {
Denis Vlasenko7d75a962007-11-22 08:16:57 +00005256 if (!drop)
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +00005257 close(fd);
Denis Vlasenko7d75a962007-11-22 08:16:57 +00005258 continue;
5259 }
Denis Vlasenko22f74142008-07-24 22:34:43 +00005260 if (copy != EMPTY) {
Denis Vlasenko34c73c42008-08-16 11:48:02 +00005261 if (!drop || (restore && (copy & COPYFD_RESTORE))) {
Denis Vlasenko22f74142008-07-24 22:34:43 +00005262 copy &= ~COPYFD_RESTORE;
Denis Vlasenko5a867312008-07-24 19:46:38 +00005263 /*close(fd);*/
Denis Vlasenko22f74142008-07-24 22:34:43 +00005264 copyfd(copy, fd | COPYFD_EXACT);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005265 }
Denis Vlasenkob9e70dd2009-03-20 01:24:08 +00005266 close(copy & ~COPYFD_RESTORE);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005267 }
5268 }
5269 redirlist = rp->next;
Denis Vlasenko01631112007-12-16 17:20:38 +00005270 g_nullredirs = rp->nullredirs;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005271 free(rp);
5272 INT_ON;
5273}
5274
5275/*
5276 * Undo all redirections. Called on error or interrupt.
5277 */
5278
5279/*
5280 * Discard all saved file descriptors.
5281 */
5282static void
5283clearredir(int drop)
5284{
5285 for (;;) {
Denis Vlasenko01631112007-12-16 17:20:38 +00005286 g_nullredirs = 0;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005287 if (!redirlist)
5288 break;
Denis Vlasenko34c73c42008-08-16 11:48:02 +00005289 popredir(drop, /*restore:*/ 0);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005290 }
5291}
5292
5293static int
5294redirectsafe(union node *redir, int flags)
5295{
5296 int err;
5297 volatile int saveint;
5298 struct jmploc *volatile savehandler = exception_handler;
5299 struct jmploc jmploc;
5300
5301 SAVE_INT(saveint);
Denis Vlasenko5a867312008-07-24 19:46:38 +00005302 /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */
5303 err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005304 if (!err) {
5305 exception_handler = &jmploc;
5306 redirect(redir, flags);
5307 }
5308 exception_handler = savehandler;
Denis Vlasenko7f88e342009-03-19 03:36:18 +00005309 if (err && exception_type != EXERROR)
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00005310 longjmp(exception_handler->loc, 1);
5311 RESTORE_INT(saveint);
5312 return err;
5313}
5314
5315
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005316/* ============ Routines to expand arguments to commands
5317 *
5318 * We have to deal with backquotes, shell variables, and file metacharacters.
5319 */
5320
Mike Frysinger98c52642009-04-02 10:02:37 +00005321#if ENABLE_SH_MATH_SUPPORT
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00005322static arith_t
5323ash_arith(const char *s)
5324{
5325 arith_eval_hooks_t math_hooks;
5326 arith_t result;
5327 int errcode = 0;
5328
5329 math_hooks.lookupvar = lookupvar;
5330 math_hooks.setvar = setvar;
5331 math_hooks.endofname = endofname;
5332
5333 INT_OFF;
5334 result = arith(s, &errcode, &math_hooks);
5335 if (errcode < 0) {
5336 if (errcode == -3)
5337 ash_msg_and_raise_error("exponent less than 0");
5338 if (errcode == -2)
5339 ash_msg_and_raise_error("divide by zero");
5340 if (errcode == -5)
5341 ash_msg_and_raise_error("expression recursion loop detected");
5342 raise_error_syntax(s);
5343 }
5344 INT_ON;
5345
5346 return result;
5347}
Denis Vlasenko448d30e2008-06-27 00:24:11 +00005348#endif
5349
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005350/*
5351 * expandarg flags
5352 */
5353#define EXP_FULL 0x1 /* perform word splitting & file globbing */
5354#define EXP_TILDE 0x2 /* do normal tilde expansion */
5355#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
5356#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
5357#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
5358#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
5359#define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
5360#define EXP_WORD 0x80 /* expand word in parameter expansion */
5361#define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
5362/*
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005363 * rmescape() flags
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005364 */
5365#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
5366#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
5367#define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
5368#define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
5369#define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
5370
5371/*
5372 * Structure specifying which parts of the string should be searched
5373 * for IFS characters.
5374 */
5375struct ifsregion {
5376 struct ifsregion *next; /* next region in list */
5377 int begoff; /* offset of start of region */
5378 int endoff; /* offset of end of region */
5379 int nulonly; /* search for nul bytes only */
5380};
5381
5382struct arglist {
5383 struct strlist *list;
5384 struct strlist **lastp;
5385};
5386
5387/* output of current string */
5388static char *expdest;
5389/* list of back quote expressions */
5390static struct nodelist *argbackq;
5391/* first struct in list of ifs regions */
5392static struct ifsregion ifsfirst;
5393/* last struct in list */
5394static struct ifsregion *ifslastp;
5395/* holds expanded arg list */
5396static struct arglist exparg;
5397
5398/*
5399 * Our own itoa().
5400 */
5401static int
5402cvtnum(arith_t num)
5403{
5404 int len;
5405
5406 expdest = makestrspace(32, expdest);
Mike Frysinger98c52642009-04-02 10:02:37 +00005407 len = fmtstr(expdest, 32, arith_t_fmt, num);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005408 STADJUST(len, expdest);
5409 return len;
5410}
5411
5412static size_t
5413esclen(const char *start, const char *p)
5414{
5415 size_t esc = 0;
5416
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005417 while (p > start && (unsigned char)*--p == CTLESC) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005418 esc++;
5419 }
5420 return esc;
5421}
5422
5423/*
5424 * Remove any CTLESC characters from a string.
5425 */
5426static char *
Denys Vlasenkob6c84342009-08-29 20:23:20 +02005427rmescapes(char *str, int flag)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005428{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00005429 static const char qchars[] ALIGN1 = { CTLESC, CTLQUOTEMARK, '\0' };
Denis Vlasenkof20de5b2007-04-29 23:42:54 +00005430
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005431 char *p, *q, *r;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005432 unsigned inquotes;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005433 unsigned protect_against_glob;
5434 unsigned globbing;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005435
5436 p = strpbrk(str, qchars);
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005437 if (!p)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005438 return str;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005439
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005440 q = p;
5441 r = str;
5442 if (flag & RMESCAPE_ALLOC) {
5443 size_t len = p - str;
5444 size_t fulllen = len + strlen(p) + 1;
5445
5446 if (flag & RMESCAPE_GROW) {
5447 r = makestrspace(fulllen, expdest);
5448 } else if (flag & RMESCAPE_HEAP) {
5449 r = ckmalloc(fulllen);
5450 } else {
5451 r = stalloc(fulllen);
5452 }
5453 q = r;
5454 if (len > 0) {
Denis Vlasenko29eb3592008-05-18 14:06:08 +00005455 q = (char *)memcpy(q, str, len) + len;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005456 }
5457 }
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005458
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005459 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5460 globbing = flag & RMESCAPE_GLOB;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005461 protect_against_glob = globbing;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005462 while (*p) {
5463 if (*p == CTLQUOTEMARK) {
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005464// TODO: if no RMESCAPE_QUOTED in flags, inquotes never becomes 0
5465// (alternates between RMESCAPE_QUOTED and ~RMESCAPE_QUOTED). Is it ok?
5466// Note: both inquotes and protect_against_glob only affect whether
5467// CTLESC,<ch> gets converted to <ch> or to \<ch>
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005468 inquotes = ~inquotes;
5469 p++;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005470 protect_against_glob = globbing;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005471 continue;
5472 }
5473 if (*p == '\\') {
5474 /* naked back slash */
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005475 protect_against_glob = 0;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005476 goto copy;
5477 }
5478 if (*p == CTLESC) {
5479 p++;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005480 if (protect_against_glob && inquotes && *p != '/') {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005481 *q++ = '\\';
5482 }
5483 }
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005484 protect_against_glob = globbing;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005485 copy:
5486 *q++ = *p++;
5487 }
5488 *q = '\0';
5489 if (flag & RMESCAPE_GROW) {
5490 expdest = r;
5491 STADJUST(q - r + 1, expdest);
5492 }
5493 return r;
5494}
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005495#define pmatch(a, b) !fnmatch((a), (b), 0)
5496
5497/*
5498 * Prepare a pattern for a expmeta (internal glob(3)) call.
5499 *
5500 * Returns an stalloced string.
5501 */
5502static char *
5503preglob(const char *pattern, int quoted, int flag)
5504{
5505 flag |= RMESCAPE_GLOB;
5506 if (quoted) {
5507 flag |= RMESCAPE_QUOTED;
5508 }
Denys Vlasenkob6c84342009-08-29 20:23:20 +02005509 return rmescapes((char *)pattern, flag);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005510}
5511
5512/*
5513 * Put a string on the stack.
5514 */
5515static void
5516memtodest(const char *p, size_t len, int syntax, int quotes)
5517{
5518 char *q = expdest;
5519
Denys Vlasenkob6c84342009-08-29 20:23:20 +02005520 q = makestrspace(quotes ? len * 2 : len, q);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005521
5522 while (len--) {
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00005523 int c = signed_char2int(*p++);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005524 if (!c)
5525 continue;
Denys Vlasenkob6c84342009-08-29 20:23:20 +02005526 if (quotes) {
5527 int n = SIT(c, syntax);
5528 if (n == CCTL || n == CBACK)
5529 USTPUTC(CTLESC, q);
5530 }
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005531 USTPUTC(c, q);
5532 }
5533
5534 expdest = q;
5535}
5536
5537static void
5538strtodest(const char *p, int syntax, int quotes)
5539{
5540 memtodest(p, strlen(p), syntax, quotes);
5541}
5542
5543/*
5544 * Record the fact that we have to scan this region of the
5545 * string for IFS characters.
5546 */
5547static void
5548recordregion(int start, int end, int nulonly)
5549{
5550 struct ifsregion *ifsp;
5551
5552 if (ifslastp == NULL) {
5553 ifsp = &ifsfirst;
5554 } else {
5555 INT_OFF;
Denis Vlasenko597906c2008-02-20 16:38:54 +00005556 ifsp = ckzalloc(sizeof(*ifsp));
5557 /*ifsp->next = NULL; - ckzalloc did it */
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005558 ifslastp->next = ifsp;
5559 INT_ON;
5560 }
5561 ifslastp = ifsp;
5562 ifslastp->begoff = start;
5563 ifslastp->endoff = end;
5564 ifslastp->nulonly = nulonly;
5565}
5566
5567static void
5568removerecordregions(int endoff)
5569{
5570 if (ifslastp == NULL)
5571 return;
5572
5573 if (ifsfirst.endoff > endoff) {
5574 while (ifsfirst.next != NULL) {
5575 struct ifsregion *ifsp;
5576 INT_OFF;
5577 ifsp = ifsfirst.next->next;
5578 free(ifsfirst.next);
5579 ifsfirst.next = ifsp;
5580 INT_ON;
5581 }
5582 if (ifsfirst.begoff > endoff)
5583 ifslastp = NULL;
5584 else {
5585 ifslastp = &ifsfirst;
5586 ifsfirst.endoff = endoff;
5587 }
5588 return;
5589 }
5590
5591 ifslastp = &ifsfirst;
5592 while (ifslastp->next && ifslastp->next->begoff < endoff)
5593 ifslastp=ifslastp->next;
5594 while (ifslastp->next != NULL) {
5595 struct ifsregion *ifsp;
5596 INT_OFF;
5597 ifsp = ifslastp->next->next;
5598 free(ifslastp->next);
5599 ifslastp->next = ifsp;
5600 INT_ON;
5601 }
5602 if (ifslastp->endoff > endoff)
5603 ifslastp->endoff = endoff;
5604}
5605
5606static char *
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005607exptilde(char *startp, char *p, int flags)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005608{
5609 char c;
5610 char *name;
5611 struct passwd *pw;
5612 const char *home;
Denys Vlasenko1166d7b2009-09-16 16:20:31 +02005613 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005614 int startloc;
5615
5616 name = p + 1;
5617
5618 while ((c = *++p) != '\0') {
5619 switch (c) {
5620 case CTLESC:
5621 return startp;
5622 case CTLQUOTEMARK:
5623 return startp;
5624 case ':':
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005625 if (flags & EXP_VARTILDE)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005626 goto done;
5627 break;
5628 case '/':
5629 case CTLENDVAR:
5630 goto done;
5631 }
5632 }
5633 done:
5634 *p = '\0';
5635 if (*name == '\0') {
5636 home = lookupvar(homestr);
5637 } else {
5638 pw = getpwnam(name);
5639 if (pw == NULL)
5640 goto lose;
5641 home = pw->pw_dir;
5642 }
5643 if (!home || !*home)
5644 goto lose;
5645 *p = c;
5646 startloc = expdest - (char *)stackblock();
5647 strtodest(home, SQSYNTAX, quotes);
5648 recordregion(startloc, expdest - (char *)stackblock(), 0);
5649 return p;
5650 lose:
5651 *p = c;
5652 return startp;
5653}
5654
5655/*
5656 * Execute a command inside back quotes. If it's a builtin command, we
5657 * want to save its output in a block obtained from malloc. Otherwise
5658 * we fork off a subprocess and get the output of the command via a pipe.
5659 * Should be called with interrupts off.
5660 */
5661struct backcmd { /* result of evalbackcmd */
5662 int fd; /* file descriptor to read from */
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005663 int nleft; /* number of chars in buffer */
Denis Vlasenkob07a4962008-06-22 13:16:23 +00005664 char *buf; /* buffer */
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005665 struct job *jp; /* job structure for command */
5666};
5667
5668/* These forward decls are needed to use "eval" code for backticks handling: */
Denis Vlasenko448d30e2008-06-27 00:24:11 +00005669static uint8_t back_exitstatus; /* exit status of backquoted command */
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005670#define EV_EXIT 01 /* exit after evaluating tree */
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02005671static void evaltree(union node *, int);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005672
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02005673static void FAST_FUNC
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005674evalbackcmd(union node *n, struct backcmd *result)
5675{
5676 int saveherefd;
5677
5678 result->fd = -1;
5679 result->buf = NULL;
5680 result->nleft = 0;
5681 result->jp = NULL;
Denis Vlasenko81c3a1d2008-12-03 11:59:12 +00005682 if (n == NULL)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005683 goto out;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005684
5685 saveherefd = herefd;
5686 herefd = -1;
5687
5688 {
5689 int pip[2];
5690 struct job *jp;
5691
5692 if (pipe(pip) < 0)
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +00005693 ash_msg_and_raise_error("pipe call failed");
Denis Vlasenko68404f12008-03-17 09:00:54 +00005694 jp = makejob(/*n,*/ 1);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005695 if (forkshell(jp, n, FORK_NOJOB) == 0) {
5696 FORCE_INT_ON;
5697 close(pip[0]);
5698 if (pip[1] != 1) {
Denis Vlasenko5a867312008-07-24 19:46:38 +00005699 /*close(1);*/
5700 copyfd(pip[1], 1 | COPYFD_EXACT);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005701 close(pip[1]);
5702 }
5703 eflag = 0;
5704 evaltree(n, EV_EXIT); /* actually evaltreenr... */
5705 /* NOTREACHED */
5706 }
5707 close(pip[1]);
5708 result->fd = pip[0];
5709 result->jp = jp;
5710 }
5711 herefd = saveherefd;
5712 out:
5713 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
5714 result->fd, result->buf, result->nleft, result->jp));
5715}
5716
5717/*
5718 * Expand stuff in backwards quotes.
5719 */
5720static void
5721expbackq(union node *cmd, int quoted, int quotes)
5722{
5723 struct backcmd in;
5724 int i;
5725 char buf[128];
5726 char *p;
5727 char *dest;
5728 int startloc;
Denis Vlasenko29eb3592008-05-18 14:06:08 +00005729 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005730 struct stackmark smark;
5731
5732 INT_OFF;
5733 setstackmark(&smark);
5734 dest = expdest;
5735 startloc = dest - (char *)stackblock();
5736 grabstackstr(dest);
5737 evalbackcmd(cmd, &in);
5738 popstackmark(&smark);
5739
5740 p = in.buf;
5741 i = in.nleft;
5742 if (i == 0)
5743 goto read;
5744 for (;;) {
5745 memtodest(p, i, syntax, quotes);
5746 read:
5747 if (in.fd < 0)
5748 break;
Denis Vlasenkoe376d452008-02-20 22:23:24 +00005749 i = nonblock_safe_read(in.fd, buf, sizeof(buf));
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005750 TRACE(("expbackq: read returns %d\n", i));
5751 if (i <= 0)
5752 break;
5753 p = buf;
5754 }
5755
Denis Vlasenko60818682007-09-28 22:07:23 +00005756 free(in.buf);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005757 if (in.fd >= 0) {
5758 close(in.fd);
5759 back_exitstatus = waitforjob(in.jp);
5760 }
5761 INT_ON;
5762
5763 /* Eat all trailing newlines */
5764 dest = expdest;
5765 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
5766 STUNPUTC(dest);
5767 expdest = dest;
5768
5769 if (quoted == 0)
5770 recordregion(startloc, dest - (char *)stackblock(), 0);
5771 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
5772 (dest - (char *)stackblock()) - startloc,
5773 (dest - (char *)stackblock()) - startloc,
5774 stackblock() + startloc));
5775}
5776
Mike Frysinger98c52642009-04-02 10:02:37 +00005777#if ENABLE_SH_MATH_SUPPORT
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005778/*
5779 * Expand arithmetic expression. Backup to start of expression,
5780 * evaluate, place result in (backed up) result, adjust string position.
5781 */
5782static void
5783expari(int quotes)
5784{
5785 char *p, *start;
5786 int begoff;
5787 int flag;
5788 int len;
5789
Denis Vlasenko81c3a1d2008-12-03 11:59:12 +00005790 /* ifsfree(); */
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005791
5792 /*
5793 * This routine is slightly over-complicated for
5794 * efficiency. Next we scan backwards looking for the
5795 * start of arithmetic.
5796 */
5797 start = stackblock();
5798 p = expdest - 1;
5799 *p = '\0';
5800 p--;
5801 do {
5802 int esc;
5803
5804 while (*p != CTLARI) {
5805 p--;
5806#if DEBUG
5807 if (p < start) {
5808 ash_msg_and_raise_error("missing CTLARI (shouldn't happen)");
5809 }
5810#endif
5811 }
5812
5813 esc = esclen(start, p);
5814 if (!(esc % 2)) {
5815 break;
5816 }
5817
5818 p -= esc + 1;
5819 } while (1);
5820
5821 begoff = p - start;
5822
5823 removerecordregions(begoff);
5824
5825 flag = p[1];
5826
5827 expdest = p;
5828
5829 if (quotes)
Denys Vlasenkob6c84342009-08-29 20:23:20 +02005830 rmescapes(p + 2, 0);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005831
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00005832 len = cvtnum(ash_arith(p + 2));
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005833
5834 if (flag != '"')
5835 recordregion(begoff, begoff + len, 0);
5836}
5837#endif
5838
5839/* argstr needs it */
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005840static char *evalvar(char *p, int flags, struct strlist *var_str_list);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005841
5842/*
5843 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
5844 * characters to allow for further processing. Otherwise treat
5845 * $@ like $* since no splitting will be performed.
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00005846 *
5847 * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence
5848 * over shell varables. Needed for "A=a B=$A; echo $B" case - we use it
5849 * for correct expansion of "B=$A" word.
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005850 */
5851static void
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005852argstr(char *p, int flags, struct strlist *var_str_list)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005853{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00005854 static const char spclchars[] ALIGN1 = {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005855 '=',
5856 ':',
5857 CTLQUOTEMARK,
5858 CTLENDVAR,
5859 CTLESC,
5860 CTLVAR,
5861 CTLBACKQ,
5862 CTLBACKQ | CTLQUOTE,
Mike Frysinger98c52642009-04-02 10:02:37 +00005863#if ENABLE_SH_MATH_SUPPORT
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005864 CTLENDARI,
5865#endif
5866 0
5867 };
5868 const char *reject = spclchars;
5869 int c;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005870 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
5871 int breakall = flags & EXP_WORD;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005872 int inquotes;
5873 size_t length;
5874 int startloc;
5875
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005876 if (!(flags & EXP_VARTILDE)) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005877 reject += 2;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005878 } else if (flags & EXP_VARTILDE2) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005879 reject++;
5880 }
5881 inquotes = 0;
5882 length = 0;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005883 if (flags & EXP_TILDE) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005884 char *q;
5885
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005886 flags &= ~EXP_TILDE;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005887 tilde:
5888 q = p;
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005889 if (*q == CTLESC && (flags & EXP_QWORD))
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005890 q++;
5891 if (*q == '~')
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005892 p = exptilde(p, q, flags);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005893 }
5894 start:
5895 startloc = expdest - (char *)stackblock();
5896 for (;;) {
5897 length += strcspn(p + length, reject);
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005898 c = (unsigned char) p[length];
5899 if (c) {
5900 if (!(c & 0x80)
Mike Frysinger98c52642009-04-02 10:02:37 +00005901#if ENABLE_SH_MATH_SUPPORT
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005902 || c == CTLENDARI
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005903#endif
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005904 ) {
5905 /* c == '=' || c == ':' || c == CTLENDARI */
5906 length++;
5907 }
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005908 }
5909 if (length > 0) {
5910 int newloc;
5911 expdest = stack_nputstr(p, length, expdest);
5912 newloc = expdest - (char *)stackblock();
5913 if (breakall && !inquotes && newloc > startloc) {
5914 recordregion(startloc, newloc, 0);
5915 }
5916 startloc = newloc;
5917 }
5918 p += length + 1;
5919 length = 0;
5920
5921 switch (c) {
5922 case '\0':
5923 goto breakloop;
5924 case '=':
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005925 if (flags & EXP_VARTILDE2) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005926 p--;
5927 continue;
5928 }
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005929 flags |= EXP_VARTILDE2;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005930 reject++;
5931 /* fall through */
5932 case ':':
5933 /*
5934 * sort of a hack - expand tildes in variable
5935 * assignments (after the first '=' and after ':'s).
5936 */
5937 if (*--p == '~') {
5938 goto tilde;
5939 }
5940 continue;
5941 }
5942
5943 switch (c) {
5944 case CTLENDVAR: /* ??? */
5945 goto breakloop;
5946 case CTLQUOTEMARK:
5947 /* "$@" syntax adherence hack */
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005948 if (!inquotes
5949 && memcmp(p, dolatstr, 4) == 0
5950 && ( p[4] == CTLQUOTEMARK
5951 || (p[4] == CTLENDVAR && p[5] == CTLQUOTEMARK)
5952 )
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005953 ) {
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005954 p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005955 goto start;
5956 }
5957 inquotes = !inquotes;
5958 addquote:
5959 if (quotes) {
5960 p--;
5961 length++;
5962 startloc++;
5963 }
5964 break;
5965 case CTLESC:
5966 startloc++;
5967 length++;
5968 goto addquote;
5969 case CTLVAR:
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005970 p = evalvar(p, flags, var_str_list);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005971 goto start;
5972 case CTLBACKQ:
Denys Vlasenkob0d63382009-09-16 16:18:32 +02005973 c = '\0';
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005974 case CTLBACKQ|CTLQUOTE:
5975 expbackq(argbackq->n, c, quotes);
5976 argbackq = argbackq->next;
5977 goto start;
Mike Frysinger98c52642009-04-02 10:02:37 +00005978#if ENABLE_SH_MATH_SUPPORT
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005979 case CTLENDARI:
5980 p--;
5981 expari(quotes);
5982 goto start;
5983#endif
5984 }
5985 }
5986 breakloop:
5987 ;
5988}
5989
5990static char *
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00005991scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes,
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00005992 int zero)
5993{
Denis Vlasenkoc7131c32008-04-14 01:59:53 +00005994// This commented out code was added by James Simmons <jsimmons@infradead.org>
5995// as part of a larger change when he added support for ${var/a/b}.
5996// However, it broke # and % operators:
5997//
5998//var=ababcdcd
5999// ok bad
6000//echo ${var#ab} abcdcd abcdcd
6001//echo ${var##ab} abcdcd abcdcd
6002//echo ${var#a*b} abcdcd ababcdcd (!)
6003//echo ${var##a*b} cdcd cdcd
6004//echo ${var#?} babcdcd ababcdcd (!)
6005//echo ${var##?} babcdcd babcdcd
6006//echo ${var#*} ababcdcd babcdcd (!)
6007//echo ${var##*}
6008//echo ${var%cd} ababcd ababcd
6009//echo ${var%%cd} ababcd abab (!)
6010//echo ${var%c*d} ababcd ababcd
6011//echo ${var%%c*d} abab ababcdcd (!)
6012//echo ${var%?} ababcdc ababcdc
6013//echo ${var%%?} ababcdc ababcdcd (!)
6014//echo ${var%*} ababcdcd ababcdcd
6015//echo ${var%%*}
6016//
6017// Commenting it back out helped. Remove it completely if it really
6018// is not needed.
6019
6020 char *loc, *loc2; //, *full;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006021 char c;
6022
6023 loc = startp;
6024 loc2 = rmesc;
6025 do {
Denis Vlasenkoc7131c32008-04-14 01:59:53 +00006026 int match; // = strlen(str);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006027 const char *s = loc2;
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006028
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006029 c = *loc2;
6030 if (zero) {
6031 *loc2 = '\0';
6032 s = rmesc;
6033 }
Denis Vlasenkoc7131c32008-04-14 01:59:53 +00006034 match = pmatch(str, s); // this line was deleted
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006035
Denis Vlasenkoc7131c32008-04-14 01:59:53 +00006036// // chop off end if its '*'
6037// full = strrchr(str, '*');
6038// if (full && full != str)
6039// match--;
6040//
6041// // If str starts with '*' replace with s.
6042// if ((*str == '*') && strlen(s) >= match) {
6043// full = xstrdup(s);
6044// strncpy(full+strlen(s)-match+1, str+1, match-1);
6045// } else
6046// full = xstrndup(str, match);
6047// match = strncmp(s, full, strlen(full));
6048// free(full);
6049//
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006050 *loc2 = c;
Denis Vlasenkoc7131c32008-04-14 01:59:53 +00006051 if (match) // if (!match)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006052 return loc;
6053 if (quotes && *loc == CTLESC)
6054 loc++;
6055 loc++;
6056 loc2++;
6057 } while (c);
6058 return 0;
6059}
6060
6061static char *
6062scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
6063 int zero)
6064{
6065 int esc = 0;
6066 char *loc;
6067 char *loc2;
6068
6069 for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
6070 int match;
6071 char c = *loc2;
6072 const char *s = loc2;
6073 if (zero) {
6074 *loc2 = '\0';
6075 s = rmesc;
6076 }
6077 match = pmatch(str, s);
6078 *loc2 = c;
6079 if (match)
6080 return loc;
6081 loc--;
6082 if (quotes) {
6083 if (--esc < 0) {
6084 esc = esclen(startp, loc);
6085 }
6086 if (esc % 2) {
6087 esc--;
6088 loc--;
6089 }
6090 }
6091 }
6092 return 0;
6093}
6094
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00006095static void varunset(const char *, const char *, const char *, int) NORETURN;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006096static void
6097varunset(const char *end, const char *var, const char *umsg, int varflags)
6098{
6099 const char *msg;
6100 const char *tail;
6101
6102 tail = nullstr;
6103 msg = "parameter not set";
6104 if (umsg) {
6105 if (*end == CTLENDVAR) {
6106 if (varflags & VSNUL)
6107 tail = " or null";
Denis Vlasenko81c3a1d2008-12-03 11:59:12 +00006108 } else {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006109 msg = umsg;
Denis Vlasenko81c3a1d2008-12-03 11:59:12 +00006110 }
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006111 }
6112 ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail);
6113}
6114
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006115#if ENABLE_ASH_BASH_COMPAT
6116static char *
6117parse_sub_pattern(char *arg, int inquotes)
6118{
6119 char *idx, *repl = NULL;
6120 unsigned char c;
6121
Denis Vlasenko2659c632008-06-14 06:04:59 +00006122 idx = arg;
6123 while (1) {
6124 c = *arg;
6125 if (!c)
6126 break;
6127 if (c == '/') {
6128 /* Only the first '/' seen is our separator */
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006129 if (!repl) {
Denis Vlasenko2659c632008-06-14 06:04:59 +00006130 repl = idx + 1;
6131 c = '\0';
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006132 }
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006133 }
Denis Vlasenko2659c632008-06-14 06:04:59 +00006134 *idx++ = c;
6135 if (!inquotes && c == '\\' && arg[1] == '\\')
6136 arg++; /* skip both \\, not just first one */
6137 arg++;
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006138 }
Denis Vlasenko29038c02008-06-14 06:14:02 +00006139 *idx = c; /* NUL */
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006140
6141 return repl;
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006142}
6143#endif /* ENABLE_ASH_BASH_COMPAT */
6144
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006145static const char *
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006146subevalvar(char *p, char *str, int strloc, int subtype,
6147 int startloc, int varflags, int quotes, struct strlist *var_str_list)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006148{
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006149 struct nodelist *saveargbackq = argbackq;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006150 char *startp;
6151 char *loc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006152 char *rmesc, *rmescend;
Denis Vlasenko5e34ff22009-04-21 11:09:40 +00006153 IF_ASH_BASH_COMPAT(char *repl = NULL;)
6154 IF_ASH_BASH_COMPAT(char null = '\0';)
6155 IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006156 int saveherefd = herefd;
6157 int amount, workloc, resetloc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006158 int zero;
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006159 char *(*scan)(char*, char*, char*, char*, int, int);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006160
6161 herefd = -1;
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006162 argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
6163 var_str_list);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006164 STPUTC('\0', expdest);
6165 herefd = saveherefd;
6166 argbackq = saveargbackq;
Denis Vlasenko29eb3592008-05-18 14:06:08 +00006167 startp = (char *)stackblock() + startloc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006168
6169 switch (subtype) {
6170 case VSASSIGN:
6171 setvar(str, startp, 0);
6172 amount = startp - expdest;
6173 STADJUST(amount, expdest);
6174 return startp;
6175
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006176#if ENABLE_ASH_BASH_COMPAT
6177 case VSSUBSTR:
6178 loc = str = stackblock() + strloc;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006179 /* Read POS in ${var:POS:LEN} */
6180 pos = atoi(loc); /* number(loc) errors out on "1:4" */
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006181 len = str - startp - 1;
6182
6183 /* *loc != '\0', guaranteed by parser */
6184 if (quotes) {
6185 char *ptr;
6186
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006187 /* Adjust the length by the number of escapes */
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006188 for (ptr = startp; ptr < (str - 1); ptr++) {
Denis Vlasenkod6855d12008-09-27 14:03:25 +00006189 if (*ptr == CTLESC) {
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006190 len--;
6191 ptr++;
6192 }
6193 }
6194 }
6195 orig_len = len;
6196
6197 if (*loc++ == ':') {
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006198 /* ${var::LEN} */
6199 len = number(loc);
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006200 } else {
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006201 /* Skip POS in ${var:POS:LEN} */
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006202 len = orig_len;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006203 while (*loc && *loc != ':') {
6204 /* TODO?
6205 * bash complains on: var=qwe; echo ${var:1a:123}
6206 if (!isdigit(*loc))
6207 ash_msg_and_raise_error(msg_illnum, str);
6208 */
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006209 loc++;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006210 }
6211 if (*loc++ == ':') {
6212 len = number(loc);
6213 }
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006214 }
6215 if (pos >= orig_len) {
6216 pos = 0;
6217 len = 0;
6218 }
6219 if (len > (orig_len - pos))
6220 len = orig_len - pos;
6221
6222 for (str = startp; pos; str++, pos--) {
6223 if (quotes && *str == CTLESC)
6224 str++;
6225 }
6226 for (loc = startp; len; len--) {
6227 if (quotes && *str == CTLESC)
6228 *loc++ = *str++;
6229 *loc++ = *str++;
6230 }
6231 *loc = '\0';
6232 amount = loc - expdest;
6233 STADJUST(amount, expdest);
6234 return loc;
6235#endif
6236
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006237 case VSQUESTION:
6238 varunset(p, str, startp, varflags);
6239 /* NOTREACHED */
6240 }
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006241 resetloc = expdest - (char *)stackblock();
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006242
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006243 /* We'll comeback here if we grow the stack while handling
6244 * a VSREPLACE or VSREPLACEALL, since our pointers into the
6245 * stack will need rebasing, and we'll need to remove our work
6246 * areas each time
6247 */
Denis Vlasenko5e34ff22009-04-21 11:09:40 +00006248 IF_ASH_BASH_COMPAT(restart:)
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006249
6250 amount = expdest - ((char *)stackblock() + resetloc);
6251 STADJUST(-amount, expdest);
Denis Vlasenko29eb3592008-05-18 14:06:08 +00006252 startp = (char *)stackblock() + startloc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006253
6254 rmesc = startp;
Denis Vlasenko29eb3592008-05-18 14:06:08 +00006255 rmescend = (char *)stackblock() + strloc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006256 if (quotes) {
Denys Vlasenkob6c84342009-08-29 20:23:20 +02006257 rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006258 if (rmesc != startp) {
6259 rmescend = expdest;
Denis Vlasenko29eb3592008-05-18 14:06:08 +00006260 startp = (char *)stackblock() + startloc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006261 }
6262 }
6263 rmescend--;
Denis Vlasenko29eb3592008-05-18 14:06:08 +00006264 str = (char *)stackblock() + strloc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006265 preglob(str, varflags & VSQUOTE, 0);
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006266 workloc = expdest - (char *)stackblock();
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006267
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006268#if ENABLE_ASH_BASH_COMPAT
6269 if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
6270 char *idx, *end, *restart_detect;
6271
Denis Vlasenkod6855d12008-09-27 14:03:25 +00006272 if (!repl) {
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006273 repl = parse_sub_pattern(str, varflags & VSQUOTE);
6274 if (!repl)
6275 repl = &null;
6276 }
6277
6278 /* If there's no pattern to match, return the expansion unmolested */
6279 if (*str == '\0')
6280 return 0;
6281
6282 len = 0;
6283 idx = startp;
6284 end = str - 1;
6285 while (idx < end) {
6286 loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
6287 if (!loc) {
6288 /* No match, advance */
6289 restart_detect = stackblock();
6290 STPUTC(*idx, expdest);
6291 if (quotes && *idx == CTLESC) {
6292 idx++;
6293 len++;
6294 STPUTC(*idx, expdest);
6295 }
6296 if (stackblock() != restart_detect)
6297 goto restart;
6298 idx++;
6299 len++;
6300 rmesc++;
6301 continue;
6302 }
6303
6304 if (subtype == VSREPLACEALL) {
6305 while (idx < loc) {
6306 if (quotes && *idx == CTLESC)
6307 idx++;
6308 idx++;
6309 rmesc++;
6310 }
Denis Vlasenko81c3a1d2008-12-03 11:59:12 +00006311 } else {
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006312 idx = loc;
Denis Vlasenko81c3a1d2008-12-03 11:59:12 +00006313 }
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006314
6315 for (loc = repl; *loc; loc++) {
6316 restart_detect = stackblock();
6317 STPUTC(*loc, expdest);
6318 if (stackblock() != restart_detect)
6319 goto restart;
6320 len++;
6321 }
6322
6323 if (subtype == VSREPLACE) {
6324 while (*idx) {
6325 restart_detect = stackblock();
6326 STPUTC(*idx, expdest);
6327 if (stackblock() != restart_detect)
6328 goto restart;
6329 len++;
6330 idx++;
6331 }
6332 break;
6333 }
6334 }
6335
6336 /* We've put the replaced text into a buffer at workloc, now
6337 * move it to the right place and adjust the stack.
6338 */
6339 startp = stackblock() + startloc;
6340 STPUTC('\0', expdest);
6341 memmove(startp, stackblock() + workloc, len);
6342 startp[len++] = '\0';
6343 amount = expdest - ((char *)stackblock() + startloc + len - 1);
6344 STADJUST(-amount, expdest);
6345 return startp;
6346 }
6347#endif /* ENABLE_ASH_BASH_COMPAT */
6348
6349 subtype -= VSTRIMRIGHT;
6350#if DEBUG
6351 if (subtype < 0 || subtype > 7)
6352 abort();
6353#endif
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006354 /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
6355 zero = subtype >> 1;
6356 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
6357 scan = (subtype & 1) ^ zero ? scanleft : scanright;
6358
6359 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
6360 if (loc) {
6361 if (zero) {
6362 memmove(startp, loc, str - loc);
6363 loc = startp + (str - loc) - 1;
6364 }
6365 *loc = '\0';
6366 amount = loc - expdest;
6367 STADJUST(amount, expdest);
6368 }
6369 return loc;
6370}
6371
6372/*
6373 * Add the value of a specialized variable to the stack string.
6374 */
6375static ssize_t
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006376varvalue(char *name, int varflags, int flags, struct strlist *var_str_list)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006377{
6378 int num;
Mike Frysinger98c52642009-04-02 10:02:37 +00006379 const char *p;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006380 int i;
6381 int sep = 0;
6382 int sepq = 0;
6383 ssize_t len = 0;
6384 char **ap;
6385 int syntax;
6386 int quoted = varflags & VSQUOTE;
6387 int subtype = varflags & VSTYPE;
Denys Vlasenko1166d7b2009-09-16 16:20:31 +02006388 int quotes = flags & (EXP_FULL | EXP_CASE | EXP_REDIR);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006389
6390 if (quoted && (flags & EXP_FULL))
6391 sep = 1 << CHAR_BIT;
6392
6393 syntax = quoted ? DQSYNTAX : BASESYNTAX;
6394 switch (*name) {
6395 case '$':
6396 num = rootpid;
6397 goto numvar;
6398 case '?':
6399 num = exitstatus;
6400 goto numvar;
6401 case '#':
6402 num = shellparam.nparam;
6403 goto numvar;
6404 case '!':
6405 num = backgndpid;
6406 if (num == 0)
6407 return -1;
6408 numvar:
6409 len = cvtnum(num);
6410 break;
6411 case '-':
Mike Frysinger98c52642009-04-02 10:02:37 +00006412 expdest = makestrspace(NOPTS, expdest);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006413 for (i = NOPTS - 1; i >= 0; i--) {
6414 if (optlist[i]) {
Mike Frysinger98c52642009-04-02 10:02:37 +00006415 USTPUTC(optletters(i), expdest);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006416 len++;
6417 }
6418 }
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006419 break;
6420 case '@':
6421 if (sep)
6422 goto param;
6423 /* fall through */
6424 case '*':
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00006425 sep = ifsset() ? signed_char2int(ifsval()[0]) : ' ';
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006426 if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK))
6427 sepq = 1;
6428 param:
6429 ap = shellparam.p;
6430 if (!ap)
6431 return -1;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006432 while ((p = *ap++) != NULL) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006433 size_t partlen;
6434
6435 partlen = strlen(p);
6436 len += partlen;
6437
6438 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6439 memtodest(p, partlen, syntax, quotes);
6440
6441 if (*ap && sep) {
6442 char *q;
6443
6444 len++;
6445 if (subtype == VSPLUS || subtype == VSLENGTH) {
6446 continue;
6447 }
6448 q = expdest;
6449 if (sepq)
6450 STPUTC(CTLESC, q);
6451 STPUTC(sep, q);
6452 expdest = q;
6453 }
6454 }
6455 return len;
6456 case '0':
6457 case '1':
6458 case '2':
6459 case '3':
6460 case '4':
6461 case '5':
6462 case '6':
6463 case '7':
6464 case '8':
6465 case '9':
Denys Vlasenkoa00329c2009-08-30 20:05:10 +02006466 num = atoi(name); /* number(name) fails on ${N#str} etc */
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006467 if (num < 0 || num > shellparam.nparam)
6468 return -1;
6469 p = num ? shellparam.p[num - 1] : arg0;
6470 goto value;
6471 default:
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006472 /* NB: name has form "VAR=..." */
6473
6474 /* "A=a B=$A" case: var_str_list is a list of "A=a" strings
6475 * which should be considered before we check variables. */
6476 if (var_str_list) {
6477 unsigned name_len = (strchrnul(name, '=') - name) + 1;
6478 p = NULL;
6479 do {
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00006480 char *str, *eq;
6481 str = var_str_list->text;
6482 eq = strchr(str, '=');
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006483 if (!eq) /* stop at first non-assignment */
6484 break;
6485 eq++;
Denis Vlasenko6b06cb82008-05-15 21:30:45 +00006486 if (name_len == (unsigned)(eq - str)
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006487 && strncmp(str, name, name_len) == 0) {
6488 p = eq;
6489 /* goto value; - WRONG! */
6490 /* think "A=1 A=2 B=$A" */
6491 }
6492 var_str_list = var_str_list->next;
6493 } while (var_str_list);
6494 if (p)
6495 goto value;
6496 }
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006497 p = lookupvar(name);
6498 value:
6499 if (!p)
6500 return -1;
6501
6502 len = strlen(p);
6503 if (!(subtype == VSPLUS || subtype == VSLENGTH))
6504 memtodest(p, len, syntax, quotes);
6505 return len;
6506 }
6507
6508 if (subtype == VSPLUS || subtype == VSLENGTH)
6509 STADJUST(-len, expdest);
6510 return len;
6511}
6512
6513/*
6514 * Expand a variable, and return a pointer to the next character in the
6515 * input string.
6516 */
6517static char *
Denys Vlasenkob0d63382009-09-16 16:18:32 +02006518evalvar(char *p, int flags, struct strlist *var_str_list)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006519{
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006520 char varflags;
6521 char subtype;
6522 char quoted;
6523 char easy;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006524 char *var;
6525 int patloc;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006526 int startloc;
6527 ssize_t varlen;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006528
Denys Vlasenkob0d63382009-09-16 16:18:32 +02006529 varflags = (unsigned char) *p++;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006530 subtype = varflags & VSTYPE;
6531 quoted = varflags & VSQUOTE;
6532 var = p;
6533 easy = (!quoted || (*var == '@' && shellparam.nparam));
6534 startloc = expdest - (char *)stackblock();
6535 p = strchr(p, '=') + 1;
6536
6537 again:
Denys Vlasenkob0d63382009-09-16 16:18:32 +02006538 varlen = varvalue(var, varflags, flags, var_str_list);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006539 if (varflags & VSNUL)
6540 varlen--;
6541
6542 if (subtype == VSPLUS) {
6543 varlen = -1 - varlen;
6544 goto vsplus;
6545 }
6546
6547 if (subtype == VSMINUS) {
6548 vsplus:
6549 if (varlen < 0) {
6550 argstr(
Denys Vlasenkob0d63382009-09-16 16:18:32 +02006551 p, flags | EXP_TILDE |
6552 (quoted ? EXP_QWORD : EXP_WORD),
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006553 var_str_list
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006554 );
6555 goto end;
6556 }
6557 if (easy)
6558 goto record;
6559 goto end;
6560 }
6561
6562 if (subtype == VSASSIGN || subtype == VSQUESTION) {
6563 if (varlen < 0) {
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006564 if (subevalvar(p, var, /* strloc: */ 0,
6565 subtype, startloc, varflags,
6566 /* quotes: */ 0,
6567 var_str_list)
6568 ) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006569 varflags &= ~VSNUL;
6570 /*
6571 * Remove any recorded regions beyond
6572 * start of variable
6573 */
6574 removerecordregions(startloc);
6575 goto again;
6576 }
6577 goto end;
6578 }
6579 if (easy)
6580 goto record;
6581 goto end;
6582 }
6583
6584 if (varlen < 0 && uflag)
6585 varunset(p, var, 0, 0);
6586
6587 if (subtype == VSLENGTH) {
6588 cvtnum(varlen > 0 ? varlen : 0);
6589 goto record;
6590 }
6591
6592 if (subtype == VSNORMAL) {
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006593 if (easy)
6594 goto record;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006595 goto end;
6596 }
6597
6598#if DEBUG
6599 switch (subtype) {
6600 case VSTRIMLEFT:
6601 case VSTRIMLEFTMAX:
6602 case VSTRIMRIGHT:
6603 case VSTRIMRIGHTMAX:
Denis Vlasenko92e13c22008-03-25 01:17:40 +00006604#if ENABLE_ASH_BASH_COMPAT
6605 case VSSUBSTR:
6606 case VSREPLACE:
6607 case VSREPLACEALL:
6608#endif
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006609 break;
6610 default:
6611 abort();
6612 }
6613#endif
6614
6615 if (varlen >= 0) {
6616 /*
6617 * Terminate the string and start recording the pattern
6618 * right after it
6619 */
6620 STPUTC('\0', expdest);
6621 patloc = expdest - (char *)stackblock();
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006622 if (0 == subevalvar(p, /* str: */ NULL, patloc, subtype,
6623 startloc, varflags,
Denys Vlasenko1166d7b2009-09-16 16:20:31 +02006624//TODO: | EXP_REDIR too? All other such places do it too
Denys Vlasenkob0d63382009-09-16 16:18:32 +02006625 /* quotes: */ flags & (EXP_FULL | EXP_CASE),
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006626 var_str_list)
6627 ) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006628 int amount = expdest - (
6629 (char *)stackblock() + patloc - 1
6630 );
6631 STADJUST(-amount, expdest);
6632 }
6633 /* Remove any recorded regions beyond start of variable */
6634 removerecordregions(startloc);
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006635 record:
6636 recordregion(startloc, expdest - (char *)stackblock(), quoted);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006637 }
6638
6639 end:
6640 if (subtype != VSNORMAL) { /* skip to end of alternative */
6641 int nesting = 1;
6642 for (;;) {
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00006643 char c = *p++;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006644 if (c == CTLESC)
6645 p++;
6646 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
6647 if (varlen >= 0)
6648 argbackq = argbackq->next;
6649 } else if (c == CTLVAR) {
6650 if ((*p++ & VSTYPE) != VSNORMAL)
6651 nesting++;
6652 } else if (c == CTLENDVAR) {
6653 if (--nesting == 0)
6654 break;
6655 }
6656 }
6657 }
6658 return p;
6659}
6660
6661/*
6662 * Break the argument string into pieces based upon IFS and add the
6663 * strings to the argument list. The regions of the string to be
6664 * searched for IFS characters have been stored by recordregion.
6665 */
6666static void
6667ifsbreakup(char *string, struct arglist *arglist)
6668{
6669 struct ifsregion *ifsp;
6670 struct strlist *sp;
6671 char *start;
6672 char *p;
6673 char *q;
6674 const char *ifs, *realifs;
6675 int ifsspc;
6676 int nulonly;
6677
6678 start = string;
6679 if (ifslastp != NULL) {
6680 ifsspc = 0;
6681 nulonly = 0;
6682 realifs = ifsset() ? ifsval() : defifs;
6683 ifsp = &ifsfirst;
6684 do {
6685 p = string + ifsp->begoff;
6686 nulonly = ifsp->nulonly;
6687 ifs = nulonly ? nullstr : realifs;
6688 ifsspc = 0;
6689 while (p < string + ifsp->endoff) {
6690 q = p;
6691 if (*p == CTLESC)
6692 p++;
6693 if (!strchr(ifs, *p)) {
6694 p++;
6695 continue;
6696 }
6697 if (!nulonly)
6698 ifsspc = (strchr(defifs, *p) != NULL);
6699 /* Ignore IFS whitespace at start */
6700 if (q == start && ifsspc) {
6701 p++;
6702 start = p;
6703 continue;
6704 }
6705 *q = '\0';
Denis Vlasenko597906c2008-02-20 16:38:54 +00006706 sp = stzalloc(sizeof(*sp));
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006707 sp->text = start;
6708 *arglist->lastp = sp;
6709 arglist->lastp = &sp->next;
6710 p++;
6711 if (!nulonly) {
6712 for (;;) {
6713 if (p >= string + ifsp->endoff) {
6714 break;
6715 }
6716 q = p;
6717 if (*p == CTLESC)
6718 p++;
Denis Vlasenko2f5d0cd2008-06-23 13:24:19 +00006719 if (strchr(ifs, *p) == NULL) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006720 p = q;
6721 break;
Denis Vlasenko597906c2008-02-20 16:38:54 +00006722 }
6723 if (strchr(defifs, *p) == NULL) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006724 if (ifsspc) {
6725 p++;
6726 ifsspc = 0;
6727 } else {
6728 p = q;
6729 break;
6730 }
6731 } else
6732 p++;
6733 }
6734 }
6735 start = p;
6736 } /* while */
6737 ifsp = ifsp->next;
6738 } while (ifsp != NULL);
6739 if (nulonly)
6740 goto add;
6741 }
6742
6743 if (!*start)
6744 return;
6745
6746 add:
Denis Vlasenko597906c2008-02-20 16:38:54 +00006747 sp = stzalloc(sizeof(*sp));
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006748 sp->text = start;
6749 *arglist->lastp = sp;
6750 arglist->lastp = &sp->next;
6751}
6752
6753static void
6754ifsfree(void)
6755{
6756 struct ifsregion *p;
6757
6758 INT_OFF;
6759 p = ifsfirst.next;
6760 do {
6761 struct ifsregion *ifsp;
6762 ifsp = p->next;
6763 free(p);
6764 p = ifsp;
6765 } while (p);
6766 ifslastp = NULL;
6767 ifsfirst.next = NULL;
6768 INT_ON;
6769}
6770
6771/*
6772 * Add a file name to the list.
6773 */
6774static void
6775addfname(const char *name)
6776{
6777 struct strlist *sp;
6778
Denis Vlasenko597906c2008-02-20 16:38:54 +00006779 sp = stzalloc(sizeof(*sp));
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006780 sp->text = ststrdup(name);
6781 *exparg.lastp = sp;
6782 exparg.lastp = &sp->next;
6783}
6784
6785static char *expdir;
6786
6787/*
6788 * Do metacharacter (i.e. *, ?, [...]) expansion.
6789 */
6790static void
6791expmeta(char *enddir, char *name)
6792{
6793 char *p;
6794 const char *cp;
6795 char *start;
6796 char *endname;
6797 int metaflag;
6798 struct stat statb;
6799 DIR *dirp;
6800 struct dirent *dp;
6801 int atend;
6802 int matchdot;
6803
6804 metaflag = 0;
6805 start = name;
6806 for (p = name; *p; p++) {
6807 if (*p == '*' || *p == '?')
6808 metaflag = 1;
6809 else if (*p == '[') {
6810 char *q = p + 1;
6811 if (*q == '!')
6812 q++;
6813 for (;;) {
6814 if (*q == '\\')
6815 q++;
6816 if (*q == '/' || *q == '\0')
6817 break;
6818 if (*++q == ']') {
6819 metaflag = 1;
6820 break;
6821 }
6822 }
6823 } else if (*p == '\\')
6824 p++;
6825 else if (*p == '/') {
6826 if (metaflag)
6827 goto out;
6828 start = p + 1;
6829 }
6830 }
6831 out:
6832 if (metaflag == 0) { /* we've reached the end of the file name */
6833 if (enddir != expdir)
6834 metaflag++;
6835 p = name;
6836 do {
6837 if (*p == '\\')
6838 p++;
6839 *enddir++ = *p;
6840 } while (*p++);
6841 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
6842 addfname(expdir);
6843 return;
6844 }
6845 endname = p;
6846 if (name < start) {
6847 p = name;
6848 do {
6849 if (*p == '\\')
6850 p++;
6851 *enddir++ = *p++;
6852 } while (p < start);
6853 }
6854 if (enddir == expdir) {
6855 cp = ".";
6856 } else if (enddir == expdir + 1 && *expdir == '/') {
6857 cp = "/";
6858 } else {
6859 cp = expdir;
6860 enddir[-1] = '\0';
6861 }
6862 dirp = opendir(cp);
6863 if (dirp == NULL)
6864 return;
6865 if (enddir != expdir)
6866 enddir[-1] = '/';
6867 if (*endname == 0) {
6868 atend = 1;
6869 } else {
6870 atend = 0;
6871 *endname++ = '\0';
6872 }
6873 matchdot = 0;
6874 p = start;
6875 if (*p == '\\')
6876 p++;
6877 if (*p == '.')
6878 matchdot++;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02006879 while (!pending_int && (dp = readdir(dirp)) != NULL) {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00006880 if (dp->d_name[0] == '.' && !matchdot)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006881 continue;
6882 if (pmatch(start, dp->d_name)) {
6883 if (atend) {
6884 strcpy(enddir, dp->d_name);
6885 addfname(expdir);
6886 } else {
6887 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
6888 continue;
6889 p[-1] = '/';
6890 expmeta(p, endname);
6891 }
6892 }
6893 }
6894 closedir(dirp);
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00006895 if (!atend)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006896 endname[-1] = '/';
6897}
6898
6899static struct strlist *
6900msort(struct strlist *list, int len)
6901{
6902 struct strlist *p, *q = NULL;
6903 struct strlist **lpp;
6904 int half;
6905 int n;
6906
6907 if (len <= 1)
6908 return list;
6909 half = len >> 1;
6910 p = list;
Denis Vlasenko2f5d0cd2008-06-23 13:24:19 +00006911 for (n = half; --n >= 0;) {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006912 q = p;
6913 p = p->next;
6914 }
6915 q->next = NULL; /* terminate first half of list */
6916 q = msort(list, half); /* sort first half of list */
6917 p = msort(p, len - half); /* sort second half */
6918 lpp = &list;
6919 for (;;) {
6920#if ENABLE_LOCALE_SUPPORT
6921 if (strcoll(p->text, q->text) < 0)
6922#else
6923 if (strcmp(p->text, q->text) < 0)
6924#endif
6925 {
6926 *lpp = p;
6927 lpp = &p->next;
6928 p = *lpp;
6929 if (p == NULL) {
6930 *lpp = q;
6931 break;
6932 }
6933 } else {
6934 *lpp = q;
6935 lpp = &q->next;
6936 q = *lpp;
6937 if (q == NULL) {
6938 *lpp = p;
6939 break;
6940 }
6941 }
6942 }
6943 return list;
6944}
6945
6946/*
6947 * Sort the results of file name expansion. It calculates the number of
6948 * strings to sort and then calls msort (short for merge sort) to do the
6949 * work.
6950 */
6951static struct strlist *
6952expsort(struct strlist *str)
6953{
6954 int len;
6955 struct strlist *sp;
6956
6957 len = 0;
6958 for (sp = str; sp; sp = sp->next)
6959 len++;
6960 return msort(str, len);
6961}
6962
6963static void
Denis Vlasenko68404f12008-03-17 09:00:54 +00006964expandmeta(struct strlist *str /*, int flag*/)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006965{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +00006966 static const char metachars[] ALIGN1 = {
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00006967 '*', '?', '[', 0
6968 };
6969 /* TODO - EXP_REDIR */
6970
6971 while (str) {
6972 struct strlist **savelastp;
6973 struct strlist *sp;
6974 char *p;
6975
6976 if (fflag)
6977 goto nometa;
6978 if (!strpbrk(str->text, metachars))
6979 goto nometa;
6980 savelastp = exparg.lastp;
6981
6982 INT_OFF;
6983 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
6984 {
6985 int i = strlen(str->text);
6986 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
6987 }
6988
6989 expmeta(expdir, p);
6990 free(expdir);
6991 if (p != str->text)
6992 free(p);
6993 INT_ON;
6994 if (exparg.lastp == savelastp) {
6995 /*
6996 * no matches
6997 */
6998 nometa:
6999 *exparg.lastp = str;
Denys Vlasenkob6c84342009-08-29 20:23:20 +02007000 rmescapes(str->text, 0);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00007001 exparg.lastp = &str->next;
7002 } else {
7003 *exparg.lastp = NULL;
7004 *savelastp = sp = expsort(*savelastp);
7005 while (sp->next != NULL)
7006 sp = sp->next;
7007 exparg.lastp = &sp->next;
7008 }
7009 str = str->next;
7010 }
7011}
7012
7013/*
7014 * Perform variable substitution and command substitution on an argument,
7015 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
7016 * perform splitting and file name expansion. When arglist is NULL, perform
7017 * here document expansion.
7018 */
7019static void
7020expandarg(union node *arg, struct arglist *arglist, int flag)
7021{
7022 struct strlist *sp;
7023 char *p;
7024
7025 argbackq = arg->narg.backquote;
7026 STARTSTACKSTR(expdest);
7027 ifsfirst.next = NULL;
7028 ifslastp = NULL;
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00007029 argstr(arg->narg.text, flag,
7030 /* var_str_list: */ arglist ? arglist->list : NULL);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00007031 p = _STPUTC('\0', expdest);
7032 expdest = p - 1;
7033 if (arglist == NULL) {
7034 return; /* here document expanded */
7035 }
7036 p = grabstackstr(p);
7037 exparg.lastp = &exparg.list;
7038 /*
7039 * TODO - EXP_REDIR
7040 */
7041 if (flag & EXP_FULL) {
7042 ifsbreakup(p, &exparg);
7043 *exparg.lastp = NULL;
7044 exparg.lastp = &exparg.list;
Denis Vlasenko68404f12008-03-17 09:00:54 +00007045 expandmeta(exparg.list /*, flag*/);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00007046 } else {
7047 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
Denys Vlasenkob6c84342009-08-29 20:23:20 +02007048 rmescapes(p, 0);
Denis Vlasenko597906c2008-02-20 16:38:54 +00007049 sp = stzalloc(sizeof(*sp));
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00007050 sp->text = p;
7051 *exparg.lastp = sp;
7052 exparg.lastp = &sp->next;
7053 }
7054 if (ifsfirst.next)
7055 ifsfree();
7056 *exparg.lastp = NULL;
7057 if (exparg.list) {
7058 *arglist->lastp = exparg.list;
7059 arglist->lastp = exparg.lastp;
7060 }
7061}
7062
7063/*
7064 * Expand shell variables and backquotes inside a here document.
7065 */
7066static void
7067expandhere(union node *arg, int fd)
7068{
7069 herefd = fd;
7070 expandarg(arg, (struct arglist *)NULL, 0);
7071 full_write(fd, stackblock(), expdest - (char *)stackblock());
7072}
7073
7074/*
7075 * Returns true if the pattern matches the string.
7076 */
7077static int
7078patmatch(char *pattern, const char *string)
7079{
7080 return pmatch(preglob(pattern, 0, 0), string);
7081}
7082
7083/*
7084 * See if a pattern matches in a case statement.
7085 */
7086static int
7087casematch(union node *pattern, char *val)
7088{
7089 struct stackmark smark;
7090 int result;
7091
7092 setstackmark(&smark);
7093 argbackq = pattern->narg.backquote;
7094 STARTSTACKSTR(expdest);
7095 ifslastp = NULL;
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00007096 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE,
7097 /* var_str_list: */ NULL);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00007098 STACKSTRNUL(expdest);
7099 result = patmatch(stackblock(), val);
7100 popstackmark(&smark);
7101 return result;
7102}
7103
7104
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007105/* ============ find_command */
7106
7107struct builtincmd {
7108 const char *name;
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02007109 int (*builtin)(int, char **) FAST_FUNC;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007110 /* unsigned flags; */
7111};
7112#define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1)
Denis Vlasenkoe26b2782008-02-12 07:40:29 +00007113/* "regular" builtins always take precedence over commands,
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007114 * regardless of PATH=....%builtin... position */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007115#define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2)
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007116#define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007117
7118struct cmdentry {
Denis Vlasenko7465dbc2008-04-13 02:25:53 +00007119 smallint cmdtype; /* CMDxxx */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007120 union param {
7121 int index;
Denis Vlasenko7465dbc2008-04-13 02:25:53 +00007122 /* index >= 0 for commands without path (slashes) */
7123 /* (TODO: what exactly does the value mean? PATH position?) */
7124 /* index == -1 for commands with slashes */
7125 /* index == (-2 - applet_no) for NOFORK applets */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007126 const struct builtincmd *cmd;
7127 struct funcnode *func;
7128 } u;
7129};
7130/* values of cmdtype */
7131#define CMDUNKNOWN -1 /* no entry in table for command */
7132#define CMDNORMAL 0 /* command is an executable program */
7133#define CMDFUNCTION 1 /* command is a shell function */
7134#define CMDBUILTIN 2 /* command is a shell builtin */
7135
7136/* action to find_command() */
7137#define DO_ERR 0x01 /* prints errors */
7138#define DO_ABS 0x02 /* checks absolute paths */
7139#define DO_NOFUNC 0x04 /* don't return shell functions, for command */
7140#define DO_ALTPATH 0x08 /* using alternate path */
7141#define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
7142
7143static void find_command(char *, struct cmdentry *, int, const char *);
7144
7145
7146/* ============ Hashing commands */
7147
7148/*
7149 * When commands are first encountered, they are entered in a hash table.
7150 * This ensures that a full path search will not have to be done for them
7151 * on each invocation.
7152 *
7153 * We should investigate converting to a linear search, even though that
7154 * would make the command name "hash" a misnomer.
7155 */
7156
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007157struct tblentry {
7158 struct tblentry *next; /* next entry in hash chain */
7159 union param param; /* definition of builtin function */
Denis Vlasenko7465dbc2008-04-13 02:25:53 +00007160 smallint cmdtype; /* CMDxxx */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007161 char rehash; /* if set, cd done since entry created */
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007162 char cmdname[1]; /* name of command */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007163};
7164
Denis Vlasenko01631112007-12-16 17:20:38 +00007165static struct tblentry **cmdtable;
7166#define INIT_G_cmdtable() do { \
7167 cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \
7168} while (0)
7169
7170static int builtinloc = -1; /* index in path of %builtin, or -1 */
7171
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007172
7173static void
Denis Vlasenko5e34ff22009-04-21 11:09:40 +00007174tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007175{
7176 int repeated = 0;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007177
Denis Vlasenko80d14be2007-04-10 23:03:30 +00007178#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko4a9ca132008-04-12 20:07:08 +00007179 if (applet_no >= 0) {
Denis Vlasenkob7304742008-10-20 08:15:51 +00007180 if (APPLET_IS_NOEXEC(applet_no)) {
7181 while (*envp)
7182 putenv(*envp++);
Denis Vlasenko4a9ca132008-04-12 20:07:08 +00007183 run_applet_no_and_exit(applet_no, argv);
Denis Vlasenkob7304742008-10-20 08:15:51 +00007184 }
Denis Vlasenko4a9ca132008-04-12 20:07:08 +00007185 /* re-exec ourselves with the new arguments */
7186 execve(bb_busybox_exec_path, argv, envp);
7187 /* If they called chroot or otherwise made the binary no longer
7188 * executable, fall through */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007189 }
7190#endif
7191
7192 repeat:
7193#ifdef SYSV
7194 do {
7195 execve(cmd, argv, envp);
7196 } while (errno == EINTR);
7197#else
7198 execve(cmd, argv, envp);
7199#endif
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007200 if (repeated) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007201 free(argv);
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007202 return;
7203 }
7204 if (errno == ENOEXEC) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007205 char **ap;
7206 char **new;
7207
7208 for (ap = argv; *ap; ap++)
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007209 continue;
7210 ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007211 ap[1] = cmd;
Denis Vlasenkoc44ab012007-04-09 03:11:58 +00007212 ap[0] = cmd = (char *)DEFAULT_SHELL;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007213 ap += 2;
7214 argv++;
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007215 while ((*ap++ = *argv++) != NULL)
Denis Vlasenko597906c2008-02-20 16:38:54 +00007216 continue;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007217 argv = new;
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007218 repeated++;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007219 goto repeat;
7220 }
7221}
7222
7223/*
7224 * Exec a program. Never returns. If you change this routine, you may
7225 * have to change the find_command routine as well.
7226 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00007227static void shellexec(char **, const char *, int) NORETURN;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007228static void
7229shellexec(char **argv, const char *path, int idx)
7230{
7231 char *cmdname;
7232 int e;
7233 char **envp;
7234 int exerrno;
Denis Vlasenko4a9ca132008-04-12 20:07:08 +00007235#if ENABLE_FEATURE_SH_STANDALONE
7236 int applet_no = -1;
7237#endif
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007238
Denis Vlasenko34c73c42008-08-16 11:48:02 +00007239 clearredir(/*drop:*/ 1);
Denis Vlasenko4a9ca132008-04-12 20:07:08 +00007240 envp = listvars(VEXPORT, VUNSET, 0);
7241 if (strchr(argv[0], '/') != NULL
Denis Vlasenko80d14be2007-04-10 23:03:30 +00007242#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko4a9ca132008-04-12 20:07:08 +00007243 || (applet_no = find_applet_by_name(argv[0])) >= 0
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007244#endif
7245 ) {
Denis Vlasenko5e34ff22009-04-21 11:09:40 +00007246 tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007247 e = errno;
7248 } else {
7249 e = ENOENT;
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02007250 while ((cmdname = path_advance(&path, argv[0])) != NULL) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007251 if (--idx < 0 && pathopt == NULL) {
Denis Vlasenko5e34ff22009-04-21 11:09:40 +00007252 tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007253 if (errno != ENOENT && errno != ENOTDIR)
7254 e = errno;
7255 }
7256 stunalloc(cmdname);
7257 }
7258 }
7259
7260 /* Map to POSIX errors */
7261 switch (e) {
7262 case EACCES:
7263 exerrno = 126;
7264 break;
7265 case ENOENT:
7266 exerrno = 127;
7267 break;
7268 default:
7269 exerrno = 2;
7270 break;
7271 }
7272 exitstatus = exerrno;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02007273 TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n",
7274 argv[0], e, suppress_int));
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007275 ash_msg_and_raise(EXEXEC, "%s: %s", argv[0], errmsg(e, "not found"));
7276 /* NOTREACHED */
7277}
7278
7279static void
7280printentry(struct tblentry *cmdp)
7281{
7282 int idx;
7283 const char *path;
7284 char *name;
7285
7286 idx = cmdp->param.index;
7287 path = pathval();
7288 do {
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02007289 name = path_advance(&path, cmdp->cmdname);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007290 stunalloc(name);
7291 } while (--idx >= 0);
7292 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
7293}
7294
7295/*
7296 * Clear out command entries. The argument specifies the first entry in
7297 * PATH which has changed.
7298 */
7299static void
7300clearcmdentry(int firstchange)
7301{
7302 struct tblentry **tblp;
7303 struct tblentry **pp;
7304 struct tblentry *cmdp;
7305
7306 INT_OFF;
7307 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
7308 pp = tblp;
7309 while ((cmdp = *pp) != NULL) {
7310 if ((cmdp->cmdtype == CMDNORMAL &&
7311 cmdp->param.index >= firstchange)
7312 || (cmdp->cmdtype == CMDBUILTIN &&
7313 builtinloc >= firstchange)
7314 ) {
7315 *pp = cmdp->next;
7316 free(cmdp);
7317 } else {
7318 pp = &cmdp->next;
7319 }
7320 }
7321 }
7322 INT_ON;
7323}
7324
7325/*
7326 * Locate a command in the command hash table. If "add" is nonzero,
7327 * add the command to the table if it is not already present. The
7328 * variable "lastcmdentry" is set to point to the address of the link
7329 * pointing to the entry, so that delete_cmd_entry can delete the
7330 * entry.
7331 *
7332 * Interrupts must be off if called with add != 0.
7333 */
7334static struct tblentry **lastcmdentry;
7335
7336static struct tblentry *
7337cmdlookup(const char *name, int add)
7338{
7339 unsigned int hashval;
7340 const char *p;
7341 struct tblentry *cmdp;
7342 struct tblentry **pp;
7343
7344 p = name;
7345 hashval = (unsigned char)*p << 4;
7346 while (*p)
7347 hashval += (unsigned char)*p++;
7348 hashval &= 0x7FFF;
7349 pp = &cmdtable[hashval % CMDTABLESIZE];
7350 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7351 if (strcmp(cmdp->cmdname, name) == 0)
7352 break;
7353 pp = &cmdp->next;
7354 }
7355 if (add && cmdp == NULL) {
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007356 cmdp = *pp = ckzalloc(sizeof(struct tblentry)
7357 + strlen(name)
7358 /* + 1 - already done because
7359 * tblentry::cmdname is char[1] */);
Denis Vlasenko597906c2008-02-20 16:38:54 +00007360 /*cmdp->next = NULL; - ckzalloc did it */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007361 cmdp->cmdtype = CMDUNKNOWN;
7362 strcpy(cmdp->cmdname, name);
7363 }
7364 lastcmdentry = pp;
7365 return cmdp;
7366}
7367
7368/*
7369 * Delete the command entry returned on the last lookup.
7370 */
7371static void
7372delete_cmd_entry(void)
7373{
7374 struct tblentry *cmdp;
7375
7376 INT_OFF;
7377 cmdp = *lastcmdentry;
7378 *lastcmdentry = cmdp->next;
7379 if (cmdp->cmdtype == CMDFUNCTION)
7380 freefunc(cmdp->param.func);
7381 free(cmdp);
7382 INT_ON;
7383}
7384
7385/*
7386 * Add a new command entry, replacing any existing command entry for
7387 * the same name - except special builtins.
7388 */
7389static void
7390addcmdentry(char *name, struct cmdentry *entry)
7391{
7392 struct tblentry *cmdp;
7393
7394 cmdp = cmdlookup(name, 1);
7395 if (cmdp->cmdtype == CMDFUNCTION) {
7396 freefunc(cmdp->param.func);
7397 }
7398 cmdp->cmdtype = entry->cmdtype;
7399 cmdp->param = entry->u;
7400 cmdp->rehash = 0;
7401}
7402
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02007403static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00007404hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007405{
7406 struct tblentry **pp;
7407 struct tblentry *cmdp;
7408 int c;
7409 struct cmdentry entry;
7410 char *name;
7411
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007412 if (nextopt("r") != '\0') {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007413 clearcmdentry(0);
7414 return 0;
7415 }
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007416
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007417 if (*argptr == NULL) {
7418 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7419 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
7420 if (cmdp->cmdtype == CMDNORMAL)
7421 printentry(cmdp);
7422 }
7423 }
7424 return 0;
7425 }
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007426
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007427 c = 0;
7428 while ((name = *argptr) != NULL) {
7429 cmdp = cmdlookup(name, 0);
7430 if (cmdp != NULL
7431 && (cmdp->cmdtype == CMDNORMAL
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007432 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
7433 ) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007434 delete_cmd_entry();
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007435 }
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007436 find_command(name, &entry, DO_ERR, pathval());
7437 if (entry.cmdtype == CMDUNKNOWN)
7438 c = 1;
7439 argptr++;
7440 }
7441 return c;
7442}
7443
7444/*
7445 * Called when a cd is done. Marks all commands so the next time they
7446 * are executed they will be rehashed.
7447 */
7448static void
7449hashcd(void)
7450{
7451 struct tblentry **pp;
7452 struct tblentry *cmdp;
7453
7454 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
7455 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007456 if (cmdp->cmdtype == CMDNORMAL
7457 || (cmdp->cmdtype == CMDBUILTIN
7458 && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
7459 && builtinloc > 0)
7460 ) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007461 cmdp->rehash = 1;
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007462 }
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007463 }
7464 }
7465}
7466
7467/*
7468 * Fix command hash table when PATH changed.
7469 * Called before PATH is changed. The argument is the new value of PATH;
7470 * pathval() still returns the old value at this point.
7471 * Called with interrupts off.
7472 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02007473static void FAST_FUNC
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007474changepath(const char *new)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007475{
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007476 const char *old;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007477 int firstchange;
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007478 int idx;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007479 int idx_bltin;
7480
7481 old = pathval();
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007482 firstchange = 9999; /* assume no change */
7483 idx = 0;
7484 idx_bltin = -1;
7485 for (;;) {
7486 if (*old != *new) {
7487 firstchange = idx;
7488 if ((*old == '\0' && *new == ':')
7489 || (*old == ':' && *new == '\0'))
7490 firstchange++;
7491 old = new; /* ignore subsequent differences */
7492 }
7493 if (*new == '\0')
7494 break;
7495 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
7496 idx_bltin = idx;
Denis Vlasenko5c3d2b32008-02-03 22:01:08 +00007497 if (*new == ':')
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007498 idx++;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007499 new++, old++;
7500 }
7501 if (builtinloc < 0 && idx_bltin >= 0)
7502 builtinloc = idx_bltin; /* zap builtins */
7503 if (builtinloc >= 0 && idx_bltin < 0)
7504 firstchange = 0;
7505 clearcmdentry(firstchange);
7506 builtinloc = idx_bltin;
7507}
7508
7509#define TEOF 0
7510#define TNL 1
7511#define TREDIR 2
7512#define TWORD 3
7513#define TSEMI 4
7514#define TBACKGND 5
7515#define TAND 6
7516#define TOR 7
7517#define TPIPE 8
7518#define TLP 9
7519#define TRP 10
7520#define TENDCASE 11
7521#define TENDBQUOTE 12
7522#define TNOT 13
7523#define TCASE 14
7524#define TDO 15
7525#define TDONE 16
7526#define TELIF 17
7527#define TELSE 18
7528#define TESAC 19
7529#define TFI 20
7530#define TFOR 21
7531#define TIF 22
7532#define TIN 23
7533#define TTHEN 24
7534#define TUNTIL 25
7535#define TWHILE 26
7536#define TBEGIN 27
7537#define TEND 28
Denis Vlasenkob07a4962008-06-22 13:16:23 +00007538typedef smallint token_id_t;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007539
7540/* first char is indicating which tokens mark the end of a list */
7541static const char *const tokname_array[] = {
7542 "\1end of file",
7543 "\0newline",
7544 "\0redirection",
7545 "\0word",
7546 "\0;",
7547 "\0&",
7548 "\0&&",
7549 "\0||",
7550 "\0|",
7551 "\0(",
7552 "\1)",
7553 "\1;;",
7554 "\1`",
7555#define KWDOFFSET 13
7556 /* the following are keywords */
7557 "\0!",
7558 "\0case",
7559 "\1do",
7560 "\1done",
7561 "\1elif",
7562 "\1else",
7563 "\1esac",
7564 "\1fi",
7565 "\0for",
7566 "\0if",
7567 "\0in",
7568 "\1then",
7569 "\0until",
7570 "\0while",
7571 "\0{",
7572 "\1}",
7573};
7574
7575static const char *
7576tokname(int tok)
7577{
7578 static char buf[16];
7579
Denis Vlasenko240a1cf2007-04-08 16:07:02 +00007580//try this:
7581//if (tok < TSEMI) return tokname_array[tok] + 1;
7582//sprintf(buf, "\"%s\"", tokname_array[tok] + 1);
7583//return buf;
7584
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007585 if (tok >= TSEMI)
7586 buf[0] = '"';
7587 sprintf(buf + (tok >= TSEMI), "%s%c",
7588 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
7589 return buf;
7590}
7591
7592/* Wrapper around strcmp for qsort/bsearch/... */
7593static int
7594pstrcmp(const void *a, const void *b)
7595{
Denis Vlasenko240a1cf2007-04-08 16:07:02 +00007596 return strcmp((char*) a, (*(char**) b) + 1);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007597}
7598
7599static const char *const *
7600findkwd(const char *s)
7601{
7602 return bsearch(s, tokname_array + KWDOFFSET,
Denis Vlasenko80b8b392007-06-25 10:55:35 +00007603 ARRAY_SIZE(tokname_array) - KWDOFFSET,
7604 sizeof(tokname_array[0]), pstrcmp);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007605}
7606
7607/*
7608 * Locate and print what a word is...
7609 */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007610static int
7611describe_command(char *command, int describe_command_verbose)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007612{
7613 struct cmdentry entry;
7614 struct tblentry *cmdp;
7615#if ENABLE_ASH_ALIAS
7616 const struct alias *ap;
7617#endif
7618 const char *path = pathval();
7619
7620 if (describe_command_verbose) {
7621 out1str(command);
7622 }
7623
7624 /* First look at the keywords */
7625 if (findkwd(command)) {
7626 out1str(describe_command_verbose ? " is a shell keyword" : command);
7627 goto out;
7628 }
7629
7630#if ENABLE_ASH_ALIAS
7631 /* Then look at the aliases */
7632 ap = lookupalias(command, 0);
7633 if (ap != NULL) {
Denis Vlasenko46846e22007-05-20 13:08:31 +00007634 if (!describe_command_verbose) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007635 out1str("alias ");
7636 printalias(ap);
7637 return 0;
7638 }
Denis Vlasenko46846e22007-05-20 13:08:31 +00007639 out1fmt(" is an alias for %s", ap->val);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007640 goto out;
7641 }
7642#endif
7643 /* Then check if it is a tracked alias */
7644 cmdp = cmdlookup(command, 0);
7645 if (cmdp != NULL) {
7646 entry.cmdtype = cmdp->cmdtype;
7647 entry.u = cmdp->param;
7648 } else {
7649 /* Finally use brute force */
7650 find_command(command, &entry, DO_ABS, path);
7651 }
7652
7653 switch (entry.cmdtype) {
7654 case CMDNORMAL: {
7655 int j = entry.u.index;
7656 char *p;
Denis Vlasenko7465dbc2008-04-13 02:25:53 +00007657 if (j < 0) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007658 p = command;
7659 } else {
7660 do {
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02007661 p = path_advance(&path, command);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007662 stunalloc(p);
7663 } while (--j >= 0);
7664 }
7665 if (describe_command_verbose) {
7666 out1fmt(" is%s %s",
7667 (cmdp ? " a tracked alias for" : nullstr), p
7668 );
7669 } else {
7670 out1str(p);
7671 }
7672 break;
7673 }
7674
7675 case CMDFUNCTION:
7676 if (describe_command_verbose) {
7677 out1str(" is a shell function");
7678 } else {
7679 out1str(command);
7680 }
7681 break;
7682
7683 case CMDBUILTIN:
7684 if (describe_command_verbose) {
7685 out1fmt(" is a %sshell builtin",
7686 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
7687 "special " : nullstr
7688 );
7689 } else {
7690 out1str(command);
7691 }
7692 break;
7693
7694 default:
7695 if (describe_command_verbose) {
7696 out1str(": not found\n");
7697 }
7698 return 127;
7699 }
7700 out:
7701 outstr("\n", stdout);
7702 return 0;
7703}
7704
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02007705static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00007706typecmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007707{
Denis Vlasenko46846e22007-05-20 13:08:31 +00007708 int i = 1;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007709 int err = 0;
Denis Vlasenko46846e22007-05-20 13:08:31 +00007710 int verbose = 1;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007711
Denis Vlasenko46846e22007-05-20 13:08:31 +00007712 /* type -p ... ? (we don't bother checking for 'p') */
Denis Vlasenko1fc62382007-06-25 22:55:34 +00007713 if (argv[1] && argv[1][0] == '-') {
Denis Vlasenko46846e22007-05-20 13:08:31 +00007714 i++;
7715 verbose = 0;
7716 }
Denis Vlasenko68404f12008-03-17 09:00:54 +00007717 while (argv[i]) {
Denis Vlasenko46846e22007-05-20 13:08:31 +00007718 err |= describe_command(argv[i++], verbose);
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007719 }
7720 return err;
7721}
7722
7723#if ENABLE_ASH_CMDCMD
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02007724static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00007725commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007726{
7727 int c;
7728 enum {
7729 VERIFY_BRIEF = 1,
7730 VERIFY_VERBOSE = 2,
7731 } verify = 0;
7732
7733 while ((c = nextopt("pvV")) != '\0')
7734 if (c == 'V')
7735 verify |= VERIFY_VERBOSE;
7736 else if (c == 'v')
7737 verify |= VERIFY_BRIEF;
7738#if DEBUG
7739 else if (c != 'p')
7740 abort();
7741#endif
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00007742 /* Mimic bash: just "command -v" doesn't complain, it's a nop */
7743 if (verify && (*argptr != NULL)) {
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007744 return describe_command(*argptr, verify - VERIFY_BRIEF);
Denis Vlasenkoe7067e32008-07-11 23:09:34 +00007745 }
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007746
7747 return 0;
7748}
7749#endif
7750
7751
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00007752/* ============ eval.c */
Eric Andersencb57d552001-06-28 07:25:16 +00007753
Denis Vlasenko340299a2008-11-21 10:36:36 +00007754static int funcblocksize; /* size of structures in function */
7755static int funcstringsize; /* size of strings in node */
7756static void *funcblock; /* block to allocate function from */
7757static char *funcstring; /* block to allocate strings from */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007758
Eric Andersencb57d552001-06-28 07:25:16 +00007759/* flags in argument to evaltree */
Denis Vlasenko340299a2008-11-21 10:36:36 +00007760#define EV_EXIT 01 /* exit after evaluating tree */
7761#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
Eric Andersenc470f442003-07-28 09:56:35 +00007762#define EV_BACKCMD 04 /* command executing within back quotes */
Eric Andersencb57d552001-06-28 07:25:16 +00007763
Denis Vlasenko340299a2008-11-21 10:36:36 +00007764static const short nodesize[N_NUMBER] = {
7765 [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)),
7766 [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)),
7767 [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)),
7768 [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)),
7769 [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)),
7770 [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)),
7771 [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)),
7772 [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)),
7773 [NIF ] = SHELL_ALIGN(sizeof(struct nif)),
7774 [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)),
7775 [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)),
7776 [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)),
7777 [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)),
7778 [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)),
7779 [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)),
7780 [NARG ] = SHELL_ALIGN(sizeof(struct narg)),
7781 [NTO ] = SHELL_ALIGN(sizeof(struct nfile)),
Denis Vlasenkocc5feab2008-11-22 01:32:40 +00007782#if ENABLE_ASH_BASH_COMPAT
Denis Vlasenko340299a2008-11-21 10:36:36 +00007783 [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)),
Denis Vlasenkocc5feab2008-11-22 01:32:40 +00007784#endif
Denis Vlasenko340299a2008-11-21 10:36:36 +00007785 [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)),
7786 [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)),
7787 [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)),
7788 [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)),
7789 [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7790 [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)),
7791 [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7792 [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)),
7793 [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)),
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007794};
7795
7796static void calcsize(union node *n);
7797
7798static void
7799sizenodelist(struct nodelist *lp)
7800{
7801 while (lp) {
7802 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
7803 calcsize(lp->n);
7804 lp = lp->next;
7805 }
7806}
7807
7808static void
7809calcsize(union node *n)
7810{
7811 if (n == NULL)
7812 return;
7813 funcblocksize += nodesize[n->type];
7814 switch (n->type) {
7815 case NCMD:
7816 calcsize(n->ncmd.redirect);
7817 calcsize(n->ncmd.args);
7818 calcsize(n->ncmd.assign);
7819 break;
7820 case NPIPE:
7821 sizenodelist(n->npipe.cmdlist);
7822 break;
7823 case NREDIR:
7824 case NBACKGND:
7825 case NSUBSHELL:
7826 calcsize(n->nredir.redirect);
7827 calcsize(n->nredir.n);
7828 break;
7829 case NAND:
7830 case NOR:
7831 case NSEMI:
7832 case NWHILE:
7833 case NUNTIL:
7834 calcsize(n->nbinary.ch2);
7835 calcsize(n->nbinary.ch1);
7836 break;
7837 case NIF:
7838 calcsize(n->nif.elsepart);
7839 calcsize(n->nif.ifpart);
7840 calcsize(n->nif.test);
7841 break;
7842 case NFOR:
7843 funcstringsize += strlen(n->nfor.var) + 1;
7844 calcsize(n->nfor.body);
7845 calcsize(n->nfor.args);
7846 break;
7847 case NCASE:
7848 calcsize(n->ncase.cases);
7849 calcsize(n->ncase.expr);
7850 break;
7851 case NCLIST:
7852 calcsize(n->nclist.body);
7853 calcsize(n->nclist.pattern);
7854 calcsize(n->nclist.next);
7855 break;
7856 case NDEFUN:
7857 case NARG:
7858 sizenodelist(n->narg.backquote);
7859 funcstringsize += strlen(n->narg.text) + 1;
7860 calcsize(n->narg.next);
7861 break;
7862 case NTO:
Denis Vlasenko559691a2008-10-05 18:39:31 +00007863#if ENABLE_ASH_BASH_COMPAT
7864 case NTO2:
7865#endif
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007866 case NCLOBBER:
7867 case NFROM:
7868 case NFROMTO:
7869 case NAPPEND:
7870 calcsize(n->nfile.fname);
7871 calcsize(n->nfile.next);
7872 break;
7873 case NTOFD:
7874 case NFROMFD:
7875 calcsize(n->ndup.vname);
7876 calcsize(n->ndup.next);
7877 break;
7878 case NHERE:
7879 case NXHERE:
7880 calcsize(n->nhere.doc);
7881 calcsize(n->nhere.next);
7882 break;
7883 case NNOT:
7884 calcsize(n->nnot.com);
7885 break;
7886 };
7887}
7888
7889static char *
7890nodeckstrdup(char *s)
7891{
7892 char *rtn = funcstring;
7893
7894 strcpy(funcstring, s);
7895 funcstring += strlen(s) + 1;
7896 return rtn;
7897}
7898
7899static union node *copynode(union node *);
7900
7901static struct nodelist *
7902copynodelist(struct nodelist *lp)
7903{
7904 struct nodelist *start;
7905 struct nodelist **lpp;
7906
7907 lpp = &start;
7908 while (lp) {
7909 *lpp = funcblock;
7910 funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist));
7911 (*lpp)->n = copynode(lp->n);
7912 lp = lp->next;
7913 lpp = &(*lpp)->next;
7914 }
7915 *lpp = NULL;
7916 return start;
7917}
7918
7919static union node *
7920copynode(union node *n)
7921{
7922 union node *new;
7923
7924 if (n == NULL)
7925 return NULL;
7926 new = funcblock;
7927 funcblock = (char *) funcblock + nodesize[n->type];
7928
7929 switch (n->type) {
7930 case NCMD:
7931 new->ncmd.redirect = copynode(n->ncmd.redirect);
7932 new->ncmd.args = copynode(n->ncmd.args);
7933 new->ncmd.assign = copynode(n->ncmd.assign);
7934 break;
7935 case NPIPE:
7936 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00007937 new->npipe.pipe_backgnd = n->npipe.pipe_backgnd;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007938 break;
7939 case NREDIR:
7940 case NBACKGND:
7941 case NSUBSHELL:
7942 new->nredir.redirect = copynode(n->nredir.redirect);
7943 new->nredir.n = copynode(n->nredir.n);
7944 break;
7945 case NAND:
7946 case NOR:
7947 case NSEMI:
7948 case NWHILE:
7949 case NUNTIL:
7950 new->nbinary.ch2 = copynode(n->nbinary.ch2);
7951 new->nbinary.ch1 = copynode(n->nbinary.ch1);
7952 break;
7953 case NIF:
7954 new->nif.elsepart = copynode(n->nif.elsepart);
7955 new->nif.ifpart = copynode(n->nif.ifpart);
7956 new->nif.test = copynode(n->nif.test);
7957 break;
7958 case NFOR:
7959 new->nfor.var = nodeckstrdup(n->nfor.var);
7960 new->nfor.body = copynode(n->nfor.body);
7961 new->nfor.args = copynode(n->nfor.args);
7962 break;
7963 case NCASE:
7964 new->ncase.cases = copynode(n->ncase.cases);
7965 new->ncase.expr = copynode(n->ncase.expr);
7966 break;
7967 case NCLIST:
7968 new->nclist.body = copynode(n->nclist.body);
7969 new->nclist.pattern = copynode(n->nclist.pattern);
7970 new->nclist.next = copynode(n->nclist.next);
7971 break;
7972 case NDEFUN:
7973 case NARG:
7974 new->narg.backquote = copynodelist(n->narg.backquote);
7975 new->narg.text = nodeckstrdup(n->narg.text);
7976 new->narg.next = copynode(n->narg.next);
7977 break;
7978 case NTO:
Denis Vlasenko559691a2008-10-05 18:39:31 +00007979#if ENABLE_ASH_BASH_COMPAT
7980 case NTO2:
7981#endif
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00007982 case NCLOBBER:
7983 case NFROM:
7984 case NFROMTO:
7985 case NAPPEND:
7986 new->nfile.fname = copynode(n->nfile.fname);
7987 new->nfile.fd = n->nfile.fd;
7988 new->nfile.next = copynode(n->nfile.next);
7989 break;
7990 case NTOFD:
7991 case NFROMFD:
7992 new->ndup.vname = copynode(n->ndup.vname);
7993 new->ndup.dupfd = n->ndup.dupfd;
7994 new->ndup.fd = n->ndup.fd;
7995 new->ndup.next = copynode(n->ndup.next);
7996 break;
7997 case NHERE:
7998 case NXHERE:
7999 new->nhere.doc = copynode(n->nhere.doc);
8000 new->nhere.fd = n->nhere.fd;
8001 new->nhere.next = copynode(n->nhere.next);
8002 break;
8003 case NNOT:
8004 new->nnot.com = copynode(n->nnot.com);
8005 break;
8006 };
8007 new->type = n->type;
8008 return new;
8009}
8010
8011/*
8012 * Make a copy of a parse tree.
8013 */
8014static struct funcnode *
8015copyfunc(union node *n)
8016{
8017 struct funcnode *f;
8018 size_t blocksize;
8019
8020 funcblocksize = offsetof(struct funcnode, n);
8021 funcstringsize = 0;
8022 calcsize(n);
8023 blocksize = funcblocksize;
8024 f = ckmalloc(blocksize + funcstringsize);
8025 funcblock = (char *) f + offsetof(struct funcnode, n);
8026 funcstring = (char *) f + blocksize;
8027 copynode(n);
8028 f->count = 0;
8029 return f;
8030}
8031
8032/*
8033 * Define a shell function.
8034 */
8035static void
8036defun(char *name, union node *func)
8037{
8038 struct cmdentry entry;
8039
8040 INT_OFF;
8041 entry.cmdtype = CMDFUNCTION;
8042 entry.u.func = copyfunc(func);
8043 addcmdentry(name, &entry);
8044 INT_ON;
8045}
8046
Denis Vlasenko4b875702009-03-19 13:30:04 +00008047/* Reasons for skipping commands (see comment on breakcmd routine) */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008048#define SKIPBREAK (1 << 0)
8049#define SKIPCONT (1 << 1)
8050#define SKIPFUNC (1 << 2)
8051#define SKIPFILE (1 << 3)
8052#define SKIPEVAL (1 << 4)
Denis Vlasenko4b875702009-03-19 13:30:04 +00008053static smallint evalskip; /* set to SKIPxxx if we are skipping commands */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008054static int skipcount; /* number of levels to skip */
8055static int funcnest; /* depth of function calls */
Denis Vlasenko2f5d0cd2008-06-23 13:24:19 +00008056static int loopnest; /* current loop nesting level */
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008057
Denis Vlasenko4b875702009-03-19 13:30:04 +00008058/* Forward decl way out to parsing code - dotrap needs it */
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008059static int evalstring(char *s, int mask);
8060
Denis Vlasenko4b875702009-03-19 13:30:04 +00008061/* Called to execute a trap.
8062 * Single callsite - at the end of evaltree().
8063 * If we return non-zero, exaltree raises EXEXIT exception.
8064 *
8065 * Perhaps we should avoid entering new trap handlers
8066 * while we are executing a trap handler. [is it a TODO?]
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008067 */
8068static int
8069dotrap(void)
8070{
Denis Vlasenko4b875702009-03-19 13:30:04 +00008071 uint8_t *g;
8072 int sig;
8073 uint8_t savestatus;
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008074
8075 savestatus = exitstatus;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02008076 pending_sig = 0;
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008077 xbarrier();
8078
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008079 TRACE(("dotrap entered\n"));
Denis Vlasenko4b875702009-03-19 13:30:04 +00008080 for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) {
8081 int want_exexit;
8082 char *t;
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008083
Denis Vlasenko4b875702009-03-19 13:30:04 +00008084 if (*g == 0)
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008085 continue;
Denis Vlasenko4b875702009-03-19 13:30:04 +00008086 t = trap[sig];
8087 /* non-trapped SIGINT is handled separately by raise_interrupt,
8088 * don't upset it by resetting gotsig[SIGINT-1] */
8089 if (sig == SIGINT && !t)
8090 continue;
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008091
8092 TRACE(("sig %d is active, will run handler '%s'\n", sig, t));
Denis Vlasenko4b875702009-03-19 13:30:04 +00008093 *g = 0;
8094 if (!t)
8095 continue;
8096 want_exexit = evalstring(t, SKIPEVAL);
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008097 exitstatus = savestatus;
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008098 if (want_exexit) {
Denis Vlasenkob21f3792009-03-19 23:09:58 +00008099 TRACE(("dotrap returns %d\n", want_exexit));
Denis Vlasenko4b875702009-03-19 13:30:04 +00008100 return want_exexit;
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008101 }
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008102 }
8103
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008104 TRACE(("dotrap returns 0\n"));
Denis Vlasenko991a1da2008-02-10 19:02:53 +00008105 return 0;
Denis Vlasenkofc06f292007-02-23 21:09:35 +00008106}
8107
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00008108/* forward declarations - evaluation is fairly recursive business... */
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008109static void evalloop(union node *, int);
8110static void evalfor(union node *, int);
8111static void evalcase(union node *, int);
8112static void evalsubshell(union node *, int);
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00008113static void expredir(union node *);
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008114static void evalpipe(union node *, int);
8115static void evalcommand(union node *, int);
Eric Andersenc470f442003-07-28 09:56:35 +00008116static int evalbltin(const struct builtincmd *, int, char **);
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008117static void prehash(union node *);
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00008118
Eric Andersen62483552001-07-10 06:09:16 +00008119/*
Eric Andersenc470f442003-07-28 09:56:35 +00008120 * Evaluate a parse tree. The value is left in the global variable
8121 * exitstatus.
Eric Andersen62483552001-07-10 06:09:16 +00008122 */
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008123static void
Eric Andersenc470f442003-07-28 09:56:35 +00008124evaltree(union node *n, int flags)
Eric Andersen62483552001-07-10 06:09:16 +00008125{
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008126 struct jmploc *volatile savehandler = exception_handler;
8127 struct jmploc jmploc;
Eric Andersenc470f442003-07-28 09:56:35 +00008128 int checkexit = 0;
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008129 void (*evalfn)(union node *, int);
Eric Andersenc470f442003-07-28 09:56:35 +00008130 int status;
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008131 int int_level;
8132
8133 SAVE_INT(int_level);
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008134
Eric Andersenc470f442003-07-28 09:56:35 +00008135 if (n == NULL) {
8136 TRACE(("evaltree(NULL) called\n"));
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008137 goto out1;
Eric Andersen62483552001-07-10 06:09:16 +00008138 }
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008139 TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags));
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008140
8141 exception_handler = &jmploc;
8142 {
8143 int err = setjmp(jmploc.loc);
8144 if (err) {
8145 /* if it was a signal, check for trap handlers */
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008146 if (exception_type == EXSIG) {
Denis Vlasenkob21f3792009-03-19 23:09:58 +00008147 TRACE(("exception %d (EXSIG) in evaltree, err=%d\n",
8148 exception_type, err));
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008149 goto out;
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008150 }
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008151 /* continue on the way out */
Denis Vlasenkob21f3792009-03-19 23:09:58 +00008152 TRACE(("exception %d in evaltree, propagating err=%d\n",
8153 exception_type, err));
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008154 exception_handler = savehandler;
8155 longjmp(exception_handler->loc, err);
8156 }
8157 }
8158
Eric Andersenc470f442003-07-28 09:56:35 +00008159 switch (n->type) {
8160 default:
Denis Vlasenkoa7189f02006-11-17 20:29:00 +00008161#if DEBUG
Eric Andersenc470f442003-07-28 09:56:35 +00008162 out1fmt("Node type = %d\n", n->type);
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00008163 fflush(stdout);
Eric Andersenc470f442003-07-28 09:56:35 +00008164 break;
8165#endif
8166 case NNOT:
8167 evaltree(n->nnot.com, EV_TESTED);
8168 status = !exitstatus;
8169 goto setstatus;
8170 case NREDIR:
8171 expredir(n->nredir.redirect);
8172 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
8173 if (!status) {
8174 evaltree(n->nredir.n, flags & EV_TESTED);
8175 status = exitstatus;
8176 }
Denis Vlasenko34c73c42008-08-16 11:48:02 +00008177 popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */);
Eric Andersenc470f442003-07-28 09:56:35 +00008178 goto setstatus;
8179 case NCMD:
8180 evalfn = evalcommand;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008181 checkexit:
Eric Andersenc470f442003-07-28 09:56:35 +00008182 if (eflag && !(flags & EV_TESTED))
8183 checkexit = ~0;
8184 goto calleval;
8185 case NFOR:
8186 evalfn = evalfor;
8187 goto calleval;
8188 case NWHILE:
8189 case NUNTIL:
8190 evalfn = evalloop;
8191 goto calleval;
8192 case NSUBSHELL:
8193 case NBACKGND:
8194 evalfn = evalsubshell;
8195 goto calleval;
8196 case NPIPE:
8197 evalfn = evalpipe;
8198 goto checkexit;
8199 case NCASE:
8200 evalfn = evalcase;
8201 goto calleval;
8202 case NAND:
8203 case NOR:
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008204 case NSEMI: {
8205
Eric Andersenc470f442003-07-28 09:56:35 +00008206#if NAND + 1 != NOR
8207#error NAND + 1 != NOR
8208#endif
8209#if NOR + 1 != NSEMI
8210#error NOR + 1 != NSEMI
8211#endif
Denis Vlasenko87d5fd92008-07-26 13:48:35 +00008212 unsigned is_or = n->type - NAND;
Eric Andersenc470f442003-07-28 09:56:35 +00008213 evaltree(
8214 n->nbinary.ch1,
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008215 (flags | ((is_or >> 1) - 1)) & EV_TESTED
Eric Andersenc470f442003-07-28 09:56:35 +00008216 );
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008217 if (!exitstatus == is_or)
Eric Andersenc470f442003-07-28 09:56:35 +00008218 break;
8219 if (!evalskip) {
8220 n = n->nbinary.ch2;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008221 evaln:
Eric Andersenc470f442003-07-28 09:56:35 +00008222 evalfn = evaltree;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008223 calleval:
Eric Andersenc470f442003-07-28 09:56:35 +00008224 evalfn(n, flags);
8225 break;
8226 }
8227 break;
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008228 }
Eric Andersenc470f442003-07-28 09:56:35 +00008229 case NIF:
8230 evaltree(n->nif.test, EV_TESTED);
8231 if (evalskip)
8232 break;
8233 if (exitstatus == 0) {
8234 n = n->nif.ifpart;
8235 goto evaln;
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008236 }
8237 if (n->nif.elsepart) {
Eric Andersenc470f442003-07-28 09:56:35 +00008238 n = n->nif.elsepart;
8239 goto evaln;
8240 }
8241 goto success;
8242 case NDEFUN:
8243 defun(n->narg.text, n->narg.next);
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008244 success:
Eric Andersenc470f442003-07-28 09:56:35 +00008245 status = 0;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008246 setstatus:
Eric Andersenc470f442003-07-28 09:56:35 +00008247 exitstatus = status;
8248 break;
8249 }
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008250
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008251 out:
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +00008252 exception_handler = savehandler;
8253 out1:
8254 if (checkexit & exitstatus)
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00008255 evalskip |= SKIPEVAL;
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02008256 else if (pending_sig && dotrap())
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00008257 goto exexit;
8258
8259 if (flags & EV_EXIT) {
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008260 exexit:
Denis Vlasenkob012b102007-02-19 22:43:01 +00008261 raise_exception(EXEXIT);
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00008262 }
Denis Vlasenko653d8e72009-03-19 21:59:35 +00008263
8264 RESTORE_INT(int_level);
8265 TRACE(("leaving evaltree (no interrupts)\n"));
Eric Andersen62483552001-07-10 06:09:16 +00008266}
8267
Eric Andersenc470f442003-07-28 09:56:35 +00008268#if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
8269static
8270#endif
8271void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
8272
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008273static void
Eric Andersenc470f442003-07-28 09:56:35 +00008274evalloop(union node *n, int flags)
Eric Andersencb57d552001-06-28 07:25:16 +00008275{
8276 int status;
8277
8278 loopnest++;
8279 status = 0;
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008280 flags &= EV_TESTED;
Eric Andersencb57d552001-06-28 07:25:16 +00008281 for (;;) {
Eric Andersenc470f442003-07-28 09:56:35 +00008282 int i;
8283
Eric Andersencb57d552001-06-28 07:25:16 +00008284 evaltree(n->nbinary.ch1, EV_TESTED);
8285 if (evalskip) {
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008286 skipping:
8287 if (evalskip == SKIPCONT && --skipcount <= 0) {
Eric Andersencb57d552001-06-28 07:25:16 +00008288 evalskip = 0;
8289 continue;
8290 }
8291 if (evalskip == SKIPBREAK && --skipcount <= 0)
8292 evalskip = 0;
8293 break;
8294 }
Eric Andersenc470f442003-07-28 09:56:35 +00008295 i = exitstatus;
8296 if (n->type != NWHILE)
8297 i = !i;
8298 if (i != 0)
8299 break;
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008300 evaltree(n->nbinary.ch2, flags);
Eric Andersencb57d552001-06-28 07:25:16 +00008301 status = exitstatus;
8302 if (evalskip)
8303 goto skipping;
8304 }
8305 loopnest--;
8306 exitstatus = status;
8307}
8308
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008309static void
Eric Andersenc470f442003-07-28 09:56:35 +00008310evalfor(union node *n, int flags)
Eric Andersencb57d552001-06-28 07:25:16 +00008311{
8312 struct arglist arglist;
8313 union node *argp;
8314 struct strlist *sp;
8315 struct stackmark smark;
8316
8317 setstackmark(&smark);
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00008318 arglist.list = NULL;
Eric Andersencb57d552001-06-28 07:25:16 +00008319 arglist.lastp = &arglist.list;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008320 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
Eric Andersencb57d552001-06-28 07:25:16 +00008321 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
Eric Andersenc470f442003-07-28 09:56:35 +00008322 /* XXX */
Eric Andersencb57d552001-06-28 07:25:16 +00008323 if (evalskip)
8324 goto out;
8325 }
8326 *arglist.lastp = NULL;
8327
8328 exitstatus = 0;
8329 loopnest++;
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008330 flags &= EV_TESTED;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008331 for (sp = arglist.list; sp; sp = sp->next) {
Eric Andersencb57d552001-06-28 07:25:16 +00008332 setvar(n->nfor.var, sp->text, 0);
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008333 evaltree(n->nfor.body, flags);
Eric Andersencb57d552001-06-28 07:25:16 +00008334 if (evalskip) {
8335 if (evalskip == SKIPCONT && --skipcount <= 0) {
8336 evalskip = 0;
8337 continue;
8338 }
8339 if (evalskip == SKIPBREAK && --skipcount <= 0)
8340 evalskip = 0;
8341 break;
8342 }
8343 }
8344 loopnest--;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008345 out:
Eric Andersencb57d552001-06-28 07:25:16 +00008346 popstackmark(&smark);
8347}
8348
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008349static void
Eric Andersenc470f442003-07-28 09:56:35 +00008350evalcase(union node *n, int flags)
Eric Andersencb57d552001-06-28 07:25:16 +00008351{
8352 union node *cp;
8353 union node *patp;
8354 struct arglist arglist;
8355 struct stackmark smark;
8356
8357 setstackmark(&smark);
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00008358 arglist.list = NULL;
Eric Andersencb57d552001-06-28 07:25:16 +00008359 arglist.lastp = &arglist.list;
Eric Andersencb57d552001-06-28 07:25:16 +00008360 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
Eric Andersenc470f442003-07-28 09:56:35 +00008361 exitstatus = 0;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008362 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
8363 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
Eric Andersencb57d552001-06-28 07:25:16 +00008364 if (casematch(patp, arglist.list->text)) {
8365 if (evalskip == 0) {
8366 evaltree(cp->nclist.body, flags);
8367 }
8368 goto out;
8369 }
8370 }
8371 }
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008372 out:
Eric Andersencb57d552001-06-28 07:25:16 +00008373 popstackmark(&smark);
8374}
8375
Eric Andersenc470f442003-07-28 09:56:35 +00008376/*
8377 * Kick off a subshell to evaluate a tree.
8378 */
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008379static void
Eric Andersenc470f442003-07-28 09:56:35 +00008380evalsubshell(union node *n, int flags)
8381{
8382 struct job *jp;
8383 int backgnd = (n->type == NBACKGND);
8384 int status;
8385
8386 expredir(n->nredir.redirect);
8387 if (!backgnd && flags & EV_EXIT && !trap[0])
8388 goto nofork;
Denis Vlasenkob012b102007-02-19 22:43:01 +00008389 INT_OFF;
Denis Vlasenko68404f12008-03-17 09:00:54 +00008390 jp = makejob(/*n,*/ 1);
Eric Andersenc470f442003-07-28 09:56:35 +00008391 if (forkshell(jp, n, backgnd) == 0) {
Denis Vlasenkob012b102007-02-19 22:43:01 +00008392 INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +00008393 flags |= EV_EXIT;
8394 if (backgnd)
8395 flags &=~ EV_TESTED;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00008396 nofork:
Eric Andersenc470f442003-07-28 09:56:35 +00008397 redirect(n->nredir.redirect, 0);
8398 evaltreenr(n->nredir.n, flags);
8399 /* never returns */
8400 }
8401 status = 0;
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00008402 if (!backgnd)
Eric Andersenc470f442003-07-28 09:56:35 +00008403 status = waitforjob(jp);
8404 exitstatus = status;
Denis Vlasenkob012b102007-02-19 22:43:01 +00008405 INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +00008406}
8407
Eric Andersenc470f442003-07-28 09:56:35 +00008408/*
8409 * Compute the names of the files in a redirection list.
8410 */
Denis Vlasenko99eb8502007-02-23 21:09:49 +00008411static void fixredir(union node *, const char *, int);
Eric Andersenc470f442003-07-28 09:56:35 +00008412static void
8413expredir(union node *n)
8414{
8415 union node *redir;
8416
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008417 for (redir = n; redir; redir = redir->nfile.next) {
Eric Andersenc470f442003-07-28 09:56:35 +00008418 struct arglist fn;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008419
Denis Vlasenkoc12d51e2008-02-19 23:31:05 +00008420 fn.list = NULL;
Eric Andersenc470f442003-07-28 09:56:35 +00008421 fn.lastp = &fn.list;
8422 switch (redir->type) {
8423 case NFROMTO:
8424 case NFROM:
8425 case NTO:
Denis Vlasenko559691a2008-10-05 18:39:31 +00008426#if ENABLE_ASH_BASH_COMPAT
8427 case NTO2:
8428#endif
Eric Andersenc470f442003-07-28 09:56:35 +00008429 case NCLOBBER:
8430 case NAPPEND:
8431 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
Denis Vlasenko559691a2008-10-05 18:39:31 +00008432#if ENABLE_ASH_BASH_COMPAT
8433 store_expfname:
8434#endif
Eric Andersenc470f442003-07-28 09:56:35 +00008435 redir->nfile.expfname = fn.list->text;
8436 break;
8437 case NFROMFD:
Denis Vlasenko559691a2008-10-05 18:39:31 +00008438 case NTOFD: /* >& */
Eric Andersenc470f442003-07-28 09:56:35 +00008439 if (redir->ndup.vname) {
8440 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008441 if (fn.list == NULL)
Denis Vlasenkob012b102007-02-19 22:43:01 +00008442 ash_msg_and_raise_error("redir error");
Denis Vlasenko559691a2008-10-05 18:39:31 +00008443#if ENABLE_ASH_BASH_COMPAT
8444//FIXME: we used expandarg with different args!
8445 if (!isdigit_str9(fn.list->text)) {
8446 /* >&file, not >&fd */
8447 if (redir->nfile.fd != 1) /* 123>&file - BAD */
8448 ash_msg_and_raise_error("redir error");
8449 redir->type = NTO2;
8450 goto store_expfname;
8451 }
8452#endif
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008453 fixredir(redir, fn.list->text, 1);
Eric Andersenc470f442003-07-28 09:56:35 +00008454 }
8455 break;
8456 }
8457 }
8458}
8459
Eric Andersencb57d552001-06-28 07:25:16 +00008460/*
Eric Andersencb57d552001-06-28 07:25:16 +00008461 * Evaluate a pipeline. All the processes in the pipeline are children
8462 * of the process creating the pipeline. (This differs from some versions
8463 * of the shell, which make the last process in a pipeline the parent
8464 * of all the rest.)
8465 */
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008466static void
Eric Andersenc470f442003-07-28 09:56:35 +00008467evalpipe(union node *n, int flags)
Eric Andersencb57d552001-06-28 07:25:16 +00008468{
8469 struct job *jp;
8470 struct nodelist *lp;
8471 int pipelen;
8472 int prevfd;
8473 int pip[2];
8474
Eric Andersenc470f442003-07-28 09:56:35 +00008475 TRACE(("evalpipe(0x%lx) called\n", (long)n));
Eric Andersencb57d552001-06-28 07:25:16 +00008476 pipelen = 0;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008477 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
Eric Andersencb57d552001-06-28 07:25:16 +00008478 pipelen++;
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008479 flags |= EV_EXIT;
Denis Vlasenkob012b102007-02-19 22:43:01 +00008480 INT_OFF;
Denis Vlasenko68404f12008-03-17 09:00:54 +00008481 jp = makejob(/*n,*/ pipelen);
Eric Andersencb57d552001-06-28 07:25:16 +00008482 prevfd = -1;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00008483 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008484 prehash(lp->n);
Eric Andersencb57d552001-06-28 07:25:16 +00008485 pip[1] = -1;
8486 if (lp->next) {
8487 if (pipe(pip) < 0) {
8488 close(prevfd);
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +00008489 ash_msg_and_raise_error("pipe call failed");
Eric Andersencb57d552001-06-28 07:25:16 +00008490 }
8491 }
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00008492 if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) {
Denis Vlasenkob012b102007-02-19 22:43:01 +00008493 INT_ON;
Eric Andersencb57d552001-06-28 07:25:16 +00008494 if (pip[1] >= 0) {
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008495 close(pip[0]);
Eric Andersencb57d552001-06-28 07:25:16 +00008496 }
Glenn L McGrath50812ff2002-08-23 13:14:48 +00008497 if (prevfd > 0) {
8498 dup2(prevfd, 0);
8499 close(prevfd);
8500 }
8501 if (pip[1] > 1) {
8502 dup2(pip[1], 1);
8503 close(pip[1]);
8504 }
Eric Andersenc470f442003-07-28 09:56:35 +00008505 evaltreenr(lp->n, flags);
8506 /* never returns */
Eric Andersencb57d552001-06-28 07:25:16 +00008507 }
8508 if (prevfd >= 0)
8509 close(prevfd);
8510 prevfd = pip[0];
Denis Vlasenkob9e70dd2009-03-20 01:24:08 +00008511 /* Don't want to trigger debugging */
8512 if (pip[1] != -1)
8513 close(pip[1]);
Eric Andersencb57d552001-06-28 07:25:16 +00008514 }
Denis Vlasenko2dc240c2008-07-24 06:07:50 +00008515 if (n->npipe.pipe_backgnd == 0) {
Eric Andersencb57d552001-06-28 07:25:16 +00008516 exitstatus = waitforjob(jp);
8517 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
Eric Andersencb57d552001-06-28 07:25:16 +00008518 }
Denis Vlasenkob012b102007-02-19 22:43:01 +00008519 INT_ON;
Eric Andersencb57d552001-06-28 07:25:16 +00008520}
8521
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008522/*
8523 * Controls whether the shell is interactive or not.
8524 */
8525static void
8526setinteractive(int on)
8527{
Denis Vlasenkob07a4962008-06-22 13:16:23 +00008528 static smallint is_interactive;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008529
8530 if (++on == is_interactive)
8531 return;
8532 is_interactive = on;
8533 setsignal(SIGINT);
8534 setsignal(SIGQUIT);
8535 setsignal(SIGTERM);
8536#if !ENABLE_FEATURE_SH_EXTRA_QUIET
8537 if (is_interactive > 1) {
8538 /* Looks like they want an interactive shell */
Denis Vlasenkoca525b42007-06-13 12:27:17 +00008539 static smallint did_banner;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008540
Denis Vlasenkoca525b42007-06-13 12:27:17 +00008541 if (!did_banner) {
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008542 out1fmt(
8543 "\n\n"
Denis Vlasenkoca525b42007-06-13 12:27:17 +00008544 "%s built-in shell (ash)\n"
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008545 "Enter 'help' for a list of built-in commands."
8546 "\n\n",
Denis Vlasenkoca525b42007-06-13 12:27:17 +00008547 bb_banner);
8548 did_banner = 1;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008549 }
8550 }
8551#endif
8552}
8553
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008554static void
8555optschanged(void)
8556{
8557#if DEBUG
8558 opentrace();
8559#endif
8560 setinteractive(iflag);
8561 setjobctl(mflag);
Denis Vlasenkob07a4962008-06-22 13:16:23 +00008562#if ENABLE_FEATURE_EDITING_VI
8563 if (viflag)
8564 line_input_state->flags |= VI_MODE;
8565 else
8566 line_input_state->flags &= ~VI_MODE;
8567#else
8568 viflag = 0; /* forcibly keep the option off */
8569#endif
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00008570}
8571
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008572static struct localvar *localvars;
8573
8574/*
8575 * Called after a function returns.
8576 * Interrupts must be off.
8577 */
8578static void
8579poplocalvars(void)
8580{
8581 struct localvar *lvp;
8582 struct var *vp;
8583
8584 while ((lvp = localvars) != NULL) {
8585 localvars = lvp->next;
8586 vp = lvp->vp;
Denys Vlasenko883cea42009-07-11 15:31:59 +02008587 TRACE(("poplocalvar %s\n", vp ? vp->text : "-"));
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008588 if (vp == NULL) { /* $- saved */
8589 memcpy(optlist, lvp->text, sizeof(optlist));
8590 free((char*)lvp->text);
8591 optschanged();
8592 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
8593 unsetvar(vp->text);
8594 } else {
8595 if (vp->func)
8596 (*vp->func)(strchrnul(lvp->text, '=') + 1);
8597 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
8598 free((char*)vp->text);
8599 vp->flags = lvp->flags;
8600 vp->text = lvp->text;
8601 }
8602 free(lvp);
8603 }
8604}
8605
8606static int
8607evalfun(struct funcnode *func, int argc, char **argv, int flags)
8608{
8609 volatile struct shparam saveparam;
8610 struct localvar *volatile savelocalvars;
8611 struct jmploc *volatile savehandler;
8612 struct jmploc jmploc;
8613 int e;
8614
8615 saveparam = shellparam;
8616 savelocalvars = localvars;
8617 e = setjmp(jmploc.loc);
8618 if (e) {
8619 goto funcdone;
8620 }
8621 INT_OFF;
8622 savehandler = exception_handler;
8623 exception_handler = &jmploc;
8624 localvars = NULL;
Denis Vlasenko01631112007-12-16 17:20:38 +00008625 shellparam.malloced = 0;
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008626 func->count++;
8627 funcnest++;
8628 INT_ON;
8629 shellparam.nparam = argc - 1;
8630 shellparam.p = argv + 1;
8631#if ENABLE_ASH_GETOPTS
8632 shellparam.optind = 1;
8633 shellparam.optoff = -1;
8634#endif
8635 evaltree(&func->n, flags & EV_TESTED);
Denis Vlasenko01631112007-12-16 17:20:38 +00008636 funcdone:
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008637 INT_OFF;
8638 funcnest--;
8639 freefunc(func);
8640 poplocalvars();
8641 localvars = savelocalvars;
8642 freeparam(&shellparam);
8643 shellparam = saveparam;
8644 exception_handler = savehandler;
8645 INT_ON;
8646 evalskip &= ~SKIPFUNC;
8647 return e;
8648}
8649
Denis Vlasenko131ae172007-02-18 13:00:19 +00008650#if ENABLE_ASH_CMDCMD
Denis Vlasenkoaa744452007-02-23 01:04:22 +00008651static char **
8652parse_command_args(char **argv, const char **path)
Eric Andersenc470f442003-07-28 09:56:35 +00008653{
8654 char *cp, c;
8655
8656 for (;;) {
8657 cp = *++argv;
8658 if (!cp)
8659 return 0;
8660 if (*cp++ != '-')
8661 break;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00008662 c = *cp++;
8663 if (!c)
Eric Andersenc470f442003-07-28 09:56:35 +00008664 break;
8665 if (c == '-' && !*cp) {
8666 argv++;
8667 break;
8668 }
8669 do {
8670 switch (c) {
8671 case 'p':
Denis Vlasenkof5f75c52007-06-12 22:35:19 +00008672 *path = bb_default_path;
Eric Andersenc470f442003-07-28 09:56:35 +00008673 break;
8674 default:
8675 /* run 'typecmd' for other options */
8676 return 0;
8677 }
Denis Vlasenko9650f362007-02-23 01:04:37 +00008678 c = *cp++;
8679 } while (c);
Eric Andersenc470f442003-07-28 09:56:35 +00008680 }
8681 return argv;
8682}
8683#endif
8684
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008685/*
8686 * Make a variable a local variable. When a variable is made local, it's
8687 * value and flags are saved in a localvar structure. The saved values
8688 * will be restored when the shell function returns. We handle the name
8689 * "-" as a special case.
8690 */
8691static void
8692mklocal(char *name)
8693{
8694 struct localvar *lvp;
8695 struct var **vpp;
8696 struct var *vp;
8697
8698 INT_OFF;
Denis Vlasenko838ffd52008-02-21 04:32:08 +00008699 lvp = ckzalloc(sizeof(struct localvar));
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008700 if (LONE_DASH(name)) {
8701 char *p;
8702 p = ckmalloc(sizeof(optlist));
8703 lvp->text = memcpy(p, optlist, sizeof(optlist));
8704 vp = NULL;
8705 } else {
8706 char *eq;
8707
8708 vpp = hashvar(name);
8709 vp = *findvar(vpp, name);
8710 eq = strchr(name, '=');
8711 if (vp == NULL) {
8712 if (eq)
8713 setvareq(name, VSTRFIXED);
8714 else
8715 setvar(name, NULL, VSTRFIXED);
8716 vp = *vpp; /* the new variable */
8717 lvp->flags = VUNSET;
8718 } else {
8719 lvp->text = vp->text;
8720 lvp->flags = vp->flags;
8721 vp->flags |= VSTRFIXED|VTEXTFIXED;
8722 if (eq)
8723 setvareq(name, 0);
8724 }
8725 }
8726 lvp->vp = vp;
8727 lvp->next = localvars;
8728 localvars = lvp;
8729 INT_ON;
8730}
8731
8732/*
8733 * The "local" command.
8734 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008735static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00008736localcmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008737{
8738 char *name;
8739
8740 argv = argptr;
8741 while ((name = *argv++) != NULL) {
8742 mklocal(name);
8743 }
8744 return 0;
8745}
8746
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008747static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00008748falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +00008749{
8750 return 1;
8751}
8752
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008753static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00008754truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +00008755{
8756 return 0;
8757}
8758
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008759static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00008760execcmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +00008761{
Denis Vlasenko68404f12008-03-17 09:00:54 +00008762 if (argv[1]) {
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +00008763 iflag = 0; /* exit on error */
8764 mflag = 0;
8765 optschanged();
8766 shellexec(argv + 1, pathval(), 0);
8767 }
8768 return 0;
8769}
8770
8771/*
8772 * The return command.
8773 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008774static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00008775returncmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +00008776{
8777 /*
8778 * If called outside a function, do what ksh does;
8779 * skip the rest of the file.
8780 */
8781 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
8782 return argv[1] ? number(argv[1]) : exitstatus;
8783}
8784
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00008785/* Forward declarations for builtintab[] */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008786static int breakcmd(int, char **) FAST_FUNC;
8787static int dotcmd(int, char **) FAST_FUNC;
8788static int evalcmd(int, char **) FAST_FUNC;
8789static int exitcmd(int, char **) FAST_FUNC;
8790static int exportcmd(int, char **) FAST_FUNC;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00008791#if ENABLE_ASH_GETOPTS
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008792static int getoptscmd(int, char **) FAST_FUNC;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00008793#endif
Denis Vlasenko52764022007-02-24 13:42:56 +00008794#if !ENABLE_FEATURE_SH_EXTRA_QUIET
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008795static int helpcmd(int, char **) FAST_FUNC;
Denis Vlasenko52764022007-02-24 13:42:56 +00008796#endif
Mike Frysinger98c52642009-04-02 10:02:37 +00008797#if ENABLE_SH_MATH_SUPPORT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008798static int letcmd(int, char **) FAST_FUNC;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00008799#endif
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008800static int readcmd(int, char **) FAST_FUNC;
8801static int setcmd(int, char **) FAST_FUNC;
8802static int shiftcmd(int, char **) FAST_FUNC;
8803static int timescmd(int, char **) FAST_FUNC;
8804static int trapcmd(int, char **) FAST_FUNC;
8805static int umaskcmd(int, char **) FAST_FUNC;
8806static int unsetcmd(int, char **) FAST_FUNC;
8807static int ulimitcmd(int, char **) FAST_FUNC;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00008808
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008809#define BUILTIN_NOSPEC "0"
8810#define BUILTIN_SPECIAL "1"
8811#define BUILTIN_REGULAR "2"
8812#define BUILTIN_SPEC_REG "3"
8813#define BUILTIN_ASSIGN "4"
8814#define BUILTIN_SPEC_ASSG "5"
8815#define BUILTIN_REG_ASSG "6"
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008816#define BUILTIN_SPEC_REG_ASSG "7"
8817
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008818/* Stubs for calling non-FAST_FUNC's */
Denys Vlasenko2634bf32009-06-09 18:40:07 +02008819#if ENABLE_ASH_BUILTIN_ECHO
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008820static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); }
Denys Vlasenko2634bf32009-06-09 18:40:07 +02008821#endif
8822#if ENABLE_ASH_BUILTIN_PRINTF
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008823static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); }
Denys Vlasenko2634bf32009-06-09 18:40:07 +02008824#endif
8825#if ENABLE_ASH_BUILTIN_TEST
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008826static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); }
Denys Vlasenko2634bf32009-06-09 18:40:07 +02008827#endif
Denis Vlasenko468aea22008-04-01 14:47:57 +00008828
Denis Vlasenkof7d56652008-03-25 05:51:41 +00008829/* Keep these in proper order since it is searched via bsearch() */
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008830static const struct builtincmd builtintab[] = {
8831 { BUILTIN_SPEC_REG ".", dotcmd },
8832 { BUILTIN_SPEC_REG ":", truecmd },
8833#if ENABLE_ASH_BUILTIN_TEST
Denis Vlasenkocd2663f2008-06-01 22:36:39 +00008834 { BUILTIN_REGULAR "[", testcmd },
Denis Vlasenko80591b02008-03-25 07:49:43 +00008835#if ENABLE_ASH_BASH_COMPAT
Denis Vlasenkocd2663f2008-06-01 22:36:39 +00008836 { BUILTIN_REGULAR "[[", testcmd },
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008837#endif
Denis Vlasenko80591b02008-03-25 07:49:43 +00008838#endif
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008839#if ENABLE_ASH_ALIAS
8840 { BUILTIN_REG_ASSG "alias", aliascmd },
8841#endif
8842#if JOBS
8843 { BUILTIN_REGULAR "bg", fg_bgcmd },
8844#endif
8845 { BUILTIN_SPEC_REG "break", breakcmd },
8846 { BUILTIN_REGULAR "cd", cdcmd },
8847 { BUILTIN_NOSPEC "chdir", cdcmd },
8848#if ENABLE_ASH_CMDCMD
8849 { BUILTIN_REGULAR "command", commandcmd },
8850#endif
8851 { BUILTIN_SPEC_REG "continue", breakcmd },
8852#if ENABLE_ASH_BUILTIN_ECHO
8853 { BUILTIN_REGULAR "echo", echocmd },
8854#endif
8855 { BUILTIN_SPEC_REG "eval", evalcmd },
8856 { BUILTIN_SPEC_REG "exec", execcmd },
8857 { BUILTIN_SPEC_REG "exit", exitcmd },
8858 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
8859 { BUILTIN_REGULAR "false", falsecmd },
8860#if JOBS
8861 { BUILTIN_REGULAR "fg", fg_bgcmd },
8862#endif
8863#if ENABLE_ASH_GETOPTS
8864 { BUILTIN_REGULAR "getopts", getoptscmd },
8865#endif
8866 { BUILTIN_NOSPEC "hash", hashcmd },
8867#if !ENABLE_FEATURE_SH_EXTRA_QUIET
8868 { BUILTIN_NOSPEC "help", helpcmd },
8869#endif
8870#if JOBS
8871 { BUILTIN_REGULAR "jobs", jobscmd },
8872 { BUILTIN_REGULAR "kill", killcmd },
8873#endif
Mike Frysinger98c52642009-04-02 10:02:37 +00008874#if ENABLE_SH_MATH_SUPPORT
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008875 { BUILTIN_NOSPEC "let", letcmd },
8876#endif
8877 { BUILTIN_ASSIGN "local", localcmd },
Denis Vlasenkocd2663f2008-06-01 22:36:39 +00008878#if ENABLE_ASH_BUILTIN_PRINTF
8879 { BUILTIN_REGULAR "printf", printfcmd },
8880#endif
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008881 { BUILTIN_NOSPEC "pwd", pwdcmd },
8882 { BUILTIN_REGULAR "read", readcmd },
8883 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
8884 { BUILTIN_SPEC_REG "return", returncmd },
8885 { BUILTIN_SPEC_REG "set", setcmd },
8886 { BUILTIN_SPEC_REG "shift", shiftcmd },
8887 { BUILTIN_SPEC_REG "source", dotcmd },
8888#if ENABLE_ASH_BUILTIN_TEST
Denis Vlasenkocd2663f2008-06-01 22:36:39 +00008889 { BUILTIN_REGULAR "test", testcmd },
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008890#endif
8891 { BUILTIN_SPEC_REG "times", timescmd },
8892 { BUILTIN_SPEC_REG "trap", trapcmd },
8893 { BUILTIN_REGULAR "true", truecmd },
8894 { BUILTIN_NOSPEC "type", typecmd },
8895 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
8896 { BUILTIN_REGULAR "umask", umaskcmd },
8897#if ENABLE_ASH_ALIAS
8898 { BUILTIN_REGULAR "unalias", unaliascmd },
8899#endif
8900 { BUILTIN_SPEC_REG "unset", unsetcmd },
8901 { BUILTIN_REGULAR "wait", waitcmd },
8902};
8903
Denis Vlasenko80591b02008-03-25 07:49:43 +00008904/* Should match the above table! */
8905#define COMMANDCMD (builtintab + \
8906 2 + \
8907 1 * ENABLE_ASH_BUILTIN_TEST + \
8908 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8909 1 * ENABLE_ASH_ALIAS + \
8910 1 * ENABLE_ASH_JOB_CONTROL + \
8911 3)
8912#define EXECCMD (builtintab + \
8913 2 + \
8914 1 * ENABLE_ASH_BUILTIN_TEST + \
8915 1 * ENABLE_ASH_BUILTIN_TEST * ENABLE_ASH_BASH_COMPAT + \
8916 1 * ENABLE_ASH_ALIAS + \
8917 1 * ENABLE_ASH_JOB_CONTROL + \
8918 3 + \
8919 1 * ENABLE_ASH_CMDCMD + \
8920 1 + \
8921 ENABLE_ASH_BUILTIN_ECHO + \
8922 1)
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008923
8924/*
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008925 * Search the table of builtin commands.
8926 */
8927static struct builtincmd *
8928find_builtin(const char *name)
8929{
8930 struct builtincmd *bp;
8931
8932 bp = bsearch(
Denis Vlasenko80b8b392007-06-25 10:55:35 +00008933 name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]),
Denis Vlasenko5651bfc2007-02-23 21:08:58 +00008934 pstrcmp
8935 );
8936 return bp;
8937}
8938
8939/*
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008940 * Execute a simple command.
8941 */
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008942static int
8943isassignment(const char *p)
Paul Foxc3850c82005-07-20 18:23:39 +00008944{
8945 const char *q = endofname(p);
8946 if (p == q)
8947 return 0;
8948 return *q == '=';
8949}
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02008950static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00008951bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008952{
8953 /* Preserve exitstatus of a previous possible redirection
8954 * as POSIX mandates */
8955 return back_exitstatus;
8956}
Denys Vlasenko641dd7b2009-06-11 19:30:19 +02008957static void
Eric Andersenc470f442003-07-28 09:56:35 +00008958evalcommand(union node *cmd, int flags)
8959{
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00008960 static const struct builtincmd null_bltin = {
8961 "\0\0", bltincmd /* why three NULs? */
Denis Vlasenko4fe15f32007-02-23 01:05:26 +00008962 };
Eric Andersenc470f442003-07-28 09:56:35 +00008963 struct stackmark smark;
8964 union node *argp;
8965 struct arglist arglist;
8966 struct arglist varlist;
8967 char **argv;
8968 int argc;
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00008969 const struct strlist *sp;
Eric Andersenc470f442003-07-28 09:56:35 +00008970 struct cmdentry cmdentry;
8971 struct job *jp;
8972 char *lastarg;
8973 const char *path;
8974 int spclbltin;
Eric Andersenc470f442003-07-28 09:56:35 +00008975 int status;
8976 char **nargv;
Paul Foxc3850c82005-07-20 18:23:39 +00008977 struct builtincmd *bcmd;
Denis Vlasenko34c73c42008-08-16 11:48:02 +00008978 smallint cmd_is_exec;
8979 smallint pseudovarflag = 0;
Eric Andersenc470f442003-07-28 09:56:35 +00008980
8981 /* First expand the arguments. */
8982 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
8983 setstackmark(&smark);
8984 back_exitstatus = 0;
8985
8986 cmdentry.cmdtype = CMDBUILTIN;
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00008987 cmdentry.u.cmd = &null_bltin;
Eric Andersenc470f442003-07-28 09:56:35 +00008988 varlist.lastp = &varlist.list;
8989 *varlist.lastp = NULL;
8990 arglist.lastp = &arglist.list;
8991 *arglist.lastp = NULL;
8992
8993 argc = 0;
Denis Vlasenkob012b102007-02-19 22:43:01 +00008994 if (cmd->ncmd.args) {
Paul Foxc3850c82005-07-20 18:23:39 +00008995 bcmd = find_builtin(cmd->ncmd.args->narg.text);
8996 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
8997 }
8998
Eric Andersenc470f442003-07-28 09:56:35 +00008999 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
9000 struct strlist **spp;
9001
9002 spp = arglist.lastp;
"Vladimir N. Oleynik"bef14d72005-09-05 13:25:11 +00009003 if (pseudovarflag && isassignment(argp->narg.text))
Paul Foxc3850c82005-07-20 18:23:39 +00009004 expandarg(argp, &arglist, EXP_VARTILDE);
9005 else
9006 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
9007
Eric Andersenc470f442003-07-28 09:56:35 +00009008 for (sp = *spp; sp; sp = sp->next)
9009 argc++;
9010 }
9011
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +00009012 argv = nargv = stalloc(sizeof(char *) * (argc + 1));
Denis Vlasenko2da584f2007-02-19 22:44:05 +00009013 for (sp = arglist.list; sp; sp = sp->next) {
Eric Andersenc470f442003-07-28 09:56:35 +00009014 TRACE(("evalcommand arg: %s\n", sp->text));
9015 *nargv++ = sp->text;
9016 }
9017 *nargv = NULL;
9018
9019 lastarg = NULL;
9020 if (iflag && funcnest == 0 && argc > 0)
9021 lastarg = nargv[-1];
9022
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009023 preverrout_fd = 2;
Eric Andersenc470f442003-07-28 09:56:35 +00009024 expredir(cmd->ncmd.redirect);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009025 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2);
Eric Andersenc470f442003-07-28 09:56:35 +00009026
9027 path = vpath.text;
9028 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
9029 struct strlist **spp;
9030 char *p;
9031
9032 spp = varlist.lastp;
9033 expandarg(argp, &varlist, EXP_VARTILDE);
9034
9035 /*
9036 * Modify the command lookup path, if a PATH= assignment
9037 * is present
9038 */
9039 p = (*spp)->text;
9040 if (varequal(p, path))
9041 path = p;
9042 }
9043
9044 /* Print the command if xflag is set. */
9045 if (xflag) {
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009046 int n;
9047 const char *p = " %s";
Eric Andersenc470f442003-07-28 09:56:35 +00009048
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009049 p++;
Denis Vlasenko0de37e12007-10-17 11:08:53 +00009050 fdprintf(preverrout_fd, p, expandstr(ps4val()));
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009051
9052 sp = varlist.list;
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +00009053 for (n = 0; n < 2; n++) {
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009054 while (sp) {
Denis Vlasenko0de37e12007-10-17 11:08:53 +00009055 fdprintf(preverrout_fd, p, sp->text);
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009056 sp = sp->next;
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +00009057 if (*p == '%') {
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009058 p--;
9059 }
9060 }
9061 sp = arglist.list;
9062 }
Denis Vlasenko0e6f6612008-02-15 15:02:15 +00009063 safe_write(preverrout_fd, "\n", 1);
Eric Andersenc470f442003-07-28 09:56:35 +00009064 }
9065
9066 cmd_is_exec = 0;
9067 spclbltin = -1;
9068
9069 /* Now locate the command. */
9070 if (argc) {
9071 const char *oldpath;
9072 int cmd_flag = DO_ERR;
9073
9074 path += 5;
9075 oldpath = path;
9076 for (;;) {
9077 find_command(argv[0], &cmdentry, cmd_flag, path);
9078 if (cmdentry.cmdtype == CMDUNKNOWN) {
Denis Vlasenkob012b102007-02-19 22:43:01 +00009079 flush_stderr();
Denis Vlasenko6514c5e2008-07-24 13:41:37 +00009080 status = 127;
Eric Andersenc470f442003-07-28 09:56:35 +00009081 goto bail;
9082 }
9083
9084 /* implement bltin and command here */
9085 if (cmdentry.cmdtype != CMDBUILTIN)
9086 break;
9087 if (spclbltin < 0)
9088 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
9089 if (cmdentry.u.cmd == EXECCMD)
Denis Vlasenko34c73c42008-08-16 11:48:02 +00009090 cmd_is_exec = 1;
Denis Vlasenko131ae172007-02-18 13:00:19 +00009091#if ENABLE_ASH_CMDCMD
Eric Andersenc470f442003-07-28 09:56:35 +00009092 if (cmdentry.u.cmd == COMMANDCMD) {
Eric Andersenc470f442003-07-28 09:56:35 +00009093 path = oldpath;
9094 nargv = parse_command_args(argv, &path);
9095 if (!nargv)
9096 break;
9097 argc -= nargv - argv;
9098 argv = nargv;
9099 cmd_flag |= DO_NOFUNC;
9100 } else
9101#endif
9102 break;
9103 }
9104 }
9105
9106 if (status) {
9107 /* We have a redirection error. */
9108 if (spclbltin > 0)
Denis Vlasenkob012b102007-02-19 22:43:01 +00009109 raise_exception(EXERROR);
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009110 bail:
Eric Andersenc470f442003-07-28 09:56:35 +00009111 exitstatus = status;
9112 goto out;
9113 }
9114
9115 /* Execute the command. */
9116 switch (cmdentry.cmdtype) {
9117 default:
Denis Vlasenkobe54d6b2008-10-27 14:25:52 +00009118
Denis Vlasenko9bc80d72008-04-12 20:07:53 +00009119#if ENABLE_FEATURE_SH_NOFORK
Denis Vlasenkobe54d6b2008-10-27 14:25:52 +00009120/* Hmmm... shouldn't it happen somewhere in forkshell() instead?
9121 * Why "fork off a child process if necessary" doesn't apply to NOFORK? */
Denis Vlasenko7465dbc2008-04-13 02:25:53 +00009122 {
9123 /* find_command() encodes applet_no as (-2 - applet_no) */
9124 int applet_no = (- cmdentry.u.index - 2);
Denis Vlasenko9bc80d72008-04-12 20:07:53 +00009125 if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) {
Denis Vlasenko9bc80d72008-04-12 20:07:53 +00009126 listsetvar(varlist.list, VEXPORT|VSTACK);
Denis Vlasenko7465dbc2008-04-13 02:25:53 +00009127 /* run <applet>_main() */
9128 exitstatus = run_nofork_applet(applet_no, argv);
Denis Vlasenko9bc80d72008-04-12 20:07:53 +00009129 break;
9130 }
Denis Vlasenko7465dbc2008-04-13 02:25:53 +00009131 }
Denis Vlasenko9bc80d72008-04-12 20:07:53 +00009132#endif
Eric Andersenc470f442003-07-28 09:56:35 +00009133 /* Fork off a child process if necessary. */
9134 if (!(flags & EV_EXIT) || trap[0]) {
Denis Vlasenkob012b102007-02-19 22:43:01 +00009135 INT_OFF;
Denis Vlasenko68404f12008-03-17 09:00:54 +00009136 jp = makejob(/*cmd,*/ 1);
Eric Andersenc470f442003-07-28 09:56:35 +00009137 if (forkshell(jp, cmd, FORK_FG) != 0) {
9138 exitstatus = waitforjob(jp);
Denis Vlasenkob012b102007-02-19 22:43:01 +00009139 INT_ON;
Denis Vlasenko653d8e72009-03-19 21:59:35 +00009140 TRACE(("forked child exited with %d\n", exitstatus));
Eric Andersenc470f442003-07-28 09:56:35 +00009141 break;
9142 }
Denis Vlasenkob012b102007-02-19 22:43:01 +00009143 FORCE_INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +00009144 }
9145 listsetvar(varlist.list, VEXPORT|VSTACK);
9146 shellexec(argv, path, cmdentry.u.index);
9147 /* NOTREACHED */
9148
9149 case CMDBUILTIN:
9150 cmdenviron = varlist.list;
9151 if (cmdenviron) {
9152 struct strlist *list = cmdenviron;
9153 int i = VNOSET;
9154 if (spclbltin > 0 || argc == 0) {
9155 i = 0;
9156 if (cmd_is_exec && argc > 1)
9157 i = VEXPORT;
9158 }
9159 listsetvar(list, i);
9160 }
Denis Vlasenkobe54d6b2008-10-27 14:25:52 +00009161 /* Tight loop with builtins only:
9162 * "while kill -0 $child; do true; done"
9163 * will never exit even if $child died, unless we do this
9164 * to reap the zombie and make kill detect that it's gone: */
9165 dowait(DOWAIT_NONBLOCK, NULL);
9166
Eric Andersenc470f442003-07-28 09:56:35 +00009167 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
9168 int exit_status;
Denis Vlasenko7f88e342009-03-19 03:36:18 +00009169 int i = exception_type;
Eric Andersenc470f442003-07-28 09:56:35 +00009170 if (i == EXEXIT)
9171 goto raise;
Eric Andersenc470f442003-07-28 09:56:35 +00009172 exit_status = 2;
Eric Andersenc470f442003-07-28 09:56:35 +00009173 if (i == EXINT)
Denis Vlasenko991a1da2008-02-10 19:02:53 +00009174 exit_status = 128 + SIGINT;
Eric Andersenc470f442003-07-28 09:56:35 +00009175 if (i == EXSIG)
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02009176 exit_status = 128 + pending_sig;
Eric Andersenc470f442003-07-28 09:56:35 +00009177 exitstatus = exit_status;
Eric Andersenc470f442003-07-28 09:56:35 +00009178 if (i == EXINT || spclbltin > 0) {
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009179 raise:
Denis Vlasenko2da584f2007-02-19 22:44:05 +00009180 longjmp(exception_handler->loc, 1);
Eric Andersenc470f442003-07-28 09:56:35 +00009181 }
Denis Vlasenkob012b102007-02-19 22:43:01 +00009182 FORCE_INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +00009183 }
9184 break;
9185
9186 case CMDFUNCTION:
9187 listsetvar(varlist.list, 0);
Denis Vlasenkobe54d6b2008-10-27 14:25:52 +00009188 /* See above for the rationale */
9189 dowait(DOWAIT_NONBLOCK, NULL);
Eric Andersenc470f442003-07-28 09:56:35 +00009190 if (evalfun(cmdentry.u.func, argc, argv, flags))
9191 goto raise;
9192 break;
9193 }
9194
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009195 out:
Denis Vlasenko34c73c42008-08-16 11:48:02 +00009196 popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec);
Denis Vlasenko6514c5e2008-07-24 13:41:37 +00009197 if (lastarg) {
Eric Andersenc470f442003-07-28 09:56:35 +00009198 /* dsl: I think this is intended to be used to support
9199 * '_' in 'vi' command mode during line editing...
9200 * However I implemented that within libedit itself.
9201 */
9202 setvar("_", lastarg, 0);
Denis Vlasenko6514c5e2008-07-24 13:41:37 +00009203 }
Eric Andersenc470f442003-07-28 09:56:35 +00009204 popstackmark(&smark);
9205}
9206
9207static int
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009208evalbltin(const struct builtincmd *cmd, int argc, char **argv)
9209{
Eric Andersenc470f442003-07-28 09:56:35 +00009210 char *volatile savecmdname;
9211 struct jmploc *volatile savehandler;
9212 struct jmploc jmploc;
9213 int i;
9214
9215 savecmdname = commandname;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009216 i = setjmp(jmploc.loc);
9217 if (i)
Eric Andersenc470f442003-07-28 09:56:35 +00009218 goto cmddone;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00009219 savehandler = exception_handler;
9220 exception_handler = &jmploc;
Eric Andersenc470f442003-07-28 09:56:35 +00009221 commandname = argv[0];
9222 argptr = argv + 1;
9223 optptr = NULL; /* initialize nextopt */
9224 exitstatus = (*cmd->builtin)(argc, argv);
Denis Vlasenkob012b102007-02-19 22:43:01 +00009225 flush_stdout_stderr();
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009226 cmddone:
Glenn L McGrath7b8765c2003-08-29 07:29:30 +00009227 exitstatus |= ferror(stdout);
Rob Landleyf296f0b2006-07-06 01:09:21 +00009228 clearerr(stdout);
Eric Andersenc470f442003-07-28 09:56:35 +00009229 commandname = savecmdname;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00009230 exception_handler = savehandler;
Eric Andersenc470f442003-07-28 09:56:35 +00009231
9232 return i;
9233}
9234
Denis Vlasenkoaa744452007-02-23 01:04:22 +00009235static int
9236goodname(const char *p)
Glenn L McGrath16e45d72004-02-04 08:24:39 +00009237{
9238 return !*endofname(p);
9239}
9240
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009241
Glenn L McGrath50812ff2002-08-23 13:14:48 +00009242/*
9243 * Search for a command. This is called before we fork so that the
9244 * location of the command will be available in the parent as well as
Glenn L McGrath16e45d72004-02-04 08:24:39 +00009245 * the child. The check for "goodname" is an overly conservative
9246 * check that the name will not be subject to expansion.
Glenn L McGrath50812ff2002-08-23 13:14:48 +00009247 */
Eric Andersenc470f442003-07-28 09:56:35 +00009248static void
9249prehash(union node *n)
Glenn L McGrath50812ff2002-08-23 13:14:48 +00009250{
9251 struct cmdentry entry;
9252
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +00009253 if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text))
9254 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
Glenn L McGrath50812ff2002-08-23 13:14:48 +00009255}
9256
Eric Andersencb57d552001-06-28 07:25:16 +00009257
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +00009258/* ============ Builtin commands
9259 *
9260 * Builtin commands whose functions are closely tied to evaluation
9261 * are implemented here.
Eric Andersencb57d552001-06-28 07:25:16 +00009262 */
9263
9264/*
Eric Andersencb57d552001-06-28 07:25:16 +00009265 * Handle break and continue commands. Break, continue, and return are
9266 * all handled by setting the evalskip flag. The evaluation routines
9267 * above all check this flag, and if it is set they start skipping
9268 * commands rather than executing them. The variable skipcount is
9269 * the number of loops to break/continue, or the number of function
9270 * levels to return. (The latter is always 1.) It should probably
9271 * be an error to break out of more loops than exist, but it isn't
9272 * in the standard shell so we don't make it one here.
9273 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009274static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00009275breakcmd(int argc UNUSED_PARAM, char **argv)
Eric Andersencb57d552001-06-28 07:25:16 +00009276{
Denis Vlasenko68404f12008-03-17 09:00:54 +00009277 int n = argv[1] ? number(argv[1]) : 1;
Eric Andersencb57d552001-06-28 07:25:16 +00009278
Aaron Lehmann2aef3a62001-12-31 06:03:12 +00009279 if (n <= 0)
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +02009280 ash_msg_and_raise_error(msg_illnum, argv[1]);
Eric Andersencb57d552001-06-28 07:25:16 +00009281 if (n > loopnest)
9282 n = loopnest;
9283 if (n > 0) {
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +00009284 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
Eric Andersencb57d552001-06-28 07:25:16 +00009285 skipcount = n;
9286 }
9287 return 0;
9288}
9289
Eric Andersenc470f442003-07-28 09:56:35 +00009290
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009291/* ============ input.c
9292 *
Eric Andersen90898442003-08-06 11:20:52 +00009293 * This implements the input routines used by the parser.
Eric Andersencb57d552001-06-28 07:25:16 +00009294 */
Denis Vlasenko99eb8502007-02-23 21:09:49 +00009295
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009296enum {
9297 INPUT_PUSH_FILE = 1,
9298 INPUT_NOFILE_OK = 2,
9299};
Eric Andersencb57d552001-06-28 07:25:16 +00009300
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009301static smallint checkkwd;
Denis Vlasenko99eb8502007-02-23 21:09:49 +00009302/* values of checkkwd variable */
9303#define CHKALIAS 0x1
9304#define CHKKWD 0x2
9305#define CHKNL 0x4
9306
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009307/*
9308 * Push a string back onto the input at this current parsefile level.
9309 * We handle aliases this way.
9310 */
9311#if !ENABLE_ASH_ALIAS
9312#define pushstring(s, ap) pushstring(s)
9313#endif
9314static void
9315pushstring(char *s, struct alias *ap)
9316{
9317 struct strpush *sp;
9318 int len;
9319
9320 len = strlen(s);
9321 INT_OFF;
9322 if (g_parsefile->strpush) {
9323 sp = ckzalloc(sizeof(*sp));
9324 sp->prev = g_parsefile->strpush;
9325 } else {
9326 sp = &(g_parsefile->basestrpush);
9327 }
9328 g_parsefile->strpush = sp;
9329 sp->prev_string = g_parsefile->next_to_pgetc;
9330 sp->prev_left_in_line = g_parsefile->left_in_line;
9331#if ENABLE_ASH_ALIAS
9332 sp->ap = ap;
9333 if (ap) {
9334 ap->flag |= ALIASINUSE;
9335 sp->string = s;
9336 }
9337#endif
9338 g_parsefile->next_to_pgetc = s;
9339 g_parsefile->left_in_line = len;
9340 INT_ON;
9341}
9342
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009343static void
9344popstring(void)
Eric Andersenc470f442003-07-28 09:56:35 +00009345{
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009346 struct strpush *sp = g_parsefile->strpush;
Eric Andersenc470f442003-07-28 09:56:35 +00009347
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009348 INT_OFF;
Denis Vlasenko131ae172007-02-18 13:00:19 +00009349#if ENABLE_ASH_ALIAS
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009350 if (sp->ap) {
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009351 if (g_parsefile->next_to_pgetc[-1] == ' '
9352 || g_parsefile->next_to_pgetc[-1] == '\t'
9353 ) {
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009354 checkkwd |= CHKALIAS;
Glenn L McGrath28939ad2004-07-21 10:20:19 +00009355 }
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009356 if (sp->string != sp->ap->val) {
9357 free(sp->string);
9358 }
9359 sp->ap->flag &= ~ALIASINUSE;
9360 if (sp->ap->flag & ALIASDEAD) {
9361 unalias(sp->ap->name);
9362 }
Glenn L McGrath28939ad2004-07-21 10:20:19 +00009363 }
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00009364#endif
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009365 g_parsefile->next_to_pgetc = sp->prev_string;
9366 g_parsefile->left_in_line = sp->prev_left_in_line;
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009367 g_parsefile->strpush = sp->prev;
9368 if (sp != &(g_parsefile->basestrpush))
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009369 free(sp);
9370 INT_ON;
9371}
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00009372
Denis Vlasenkoe27dafd2008-11-28 04:01:03 +00009373//FIXME: BASH_COMPAT with "...&" does TWO pungetc():
9374//it peeks whether it is &>, and then pushes back both chars.
9375//This function needs to save last *next_to_pgetc to buf[0]
9376//to make two pungetc() reliable. Currently,
9377// pgetc (out of buf: does preadfd), pgetc, pungetc, pungetc won't work...
Denis Vlasenkoaa744452007-02-23 01:04:22 +00009378static int
9379preadfd(void)
Eric Andersencb57d552001-06-28 07:25:16 +00009380{
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00009381 int nr;
Denis Vlasenko6a0ad252008-07-25 13:34:05 +00009382 char *buf = g_parsefile->buf;
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00009383
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009384 g_parsefile->next_to_pgetc = buf;
Denis Vlasenko38f63192007-01-22 09:03:07 +00009385#if ENABLE_FEATURE_EDITING
Denis Vlasenko85c24712008-03-17 09:04:04 +00009386 retry:
Denis Vlasenko727752d2008-11-28 03:41:47 +00009387 if (!iflag || g_parsefile->fd != STDIN_FILENO)
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009388 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
Eric Andersenc470f442003-07-28 09:56:35 +00009389 else {
Denis Vlasenko38f63192007-01-22 09:03:07 +00009390#if ENABLE_FEATURE_TAB_COMPLETION
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00009391 line_input_state->path_lookup = pathval();
Eric Andersen4a79c0e2004-09-08 10:01:07 +00009392#endif
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00009393 nr = read_line_input(cmdedit_prompt, buf, BUFSIZ, line_input_state);
9394 if (nr == 0) {
9395 /* Ctrl+C pressed */
9396 if (trap[SIGINT]) {
Glenn L McGrath16e45d72004-02-04 08:24:39 +00009397 buf[0] = '\n';
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00009398 buf[1] = '\0';
Glenn L McGrath16e45d72004-02-04 08:24:39 +00009399 raise(SIGINT);
9400 return 1;
9401 }
Eric Andersenc470f442003-07-28 09:56:35 +00009402 goto retry;
9403 }
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00009404 if (nr < 0 && errno == 0) {
Denis Vlasenko9cb220b2007-12-09 10:03:28 +00009405 /* Ctrl+D pressed */
Eric Andersenc470f442003-07-28 09:56:35 +00009406 nr = 0;
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00009407 }
Eric Andersencb57d552001-06-28 07:25:16 +00009408 }
9409#else
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +00009410 nr = nonblock_safe_read(g_parsefile->fd, buf, BUFSIZ - 1);
Eric Andersencb57d552001-06-28 07:25:16 +00009411#endif
9412
Denis Vlasenkoe376d452008-02-20 22:23:24 +00009413#if 0
9414/* nonblock_safe_read() handles this problem */
Eric Andersencb57d552001-06-28 07:25:16 +00009415 if (nr < 0) {
Eric Andersencb57d552001-06-28 07:25:16 +00009416 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
Denis Vlasenkod37f2222007-08-19 13:42:08 +00009417 int flags = fcntl(0, F_GETFL);
Denis Vlasenko9cb220b2007-12-09 10:03:28 +00009418 if (flags >= 0 && (flags & O_NONBLOCK)) {
9419 flags &= ~O_NONBLOCK;
Eric Andersencb57d552001-06-28 07:25:16 +00009420 if (fcntl(0, F_SETFL, flags) >= 0) {
9421 out2str("sh: turning off NDELAY mode\n");
9422 goto retry;
9423 }
9424 }
9425 }
9426 }
Denis Vlasenkoe376d452008-02-20 22:23:24 +00009427#endif
Eric Andersencb57d552001-06-28 07:25:16 +00009428 return nr;
9429}
9430
9431/*
9432 * Refill the input buffer and return the next input character:
9433 *
9434 * 1) If a string was pushed back on the input, pop it;
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009435 * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM)
9436 * or we are reading from a string so we can't refill the buffer,
9437 * return EOF.
Denys Vlasenko883cea42009-07-11 15:31:59 +02009438 * 3) If there is more stuff in this buffer, use it else call read to fill it.
Eric Andersencb57d552001-06-28 07:25:16 +00009439 * 4) Process input up to the next newline, deleting nul characters.
9440 */
Denis Vlasenko727752d2008-11-28 03:41:47 +00009441//#define pgetc_debug(...) bb_error_msg(__VA_ARGS__)
9442#define pgetc_debug(...) ((void)0)
Denis Vlasenko68819d12008-12-15 11:26:36 +00009443/*
9444 * NB: due to SIT(c) internals (syntax_index_table[] vector),
9445 * pgetc() and related functions must return chars SIGN-EXTENDED into ints,
9446 * not zero-extended. Seems fragile to me. Affects only !USE_SIT_FUNCTION case,
9447 * so we can fix it by ditching !USE_SIT_FUNCTION if Unicode requires that.
9448 */
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009449static int
Eric Andersenc470f442003-07-28 09:56:35 +00009450preadbuffer(void)
Eric Andersencb57d552001-06-28 07:25:16 +00009451{
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009452 char *q;
Eric Andersencb57d552001-06-28 07:25:16 +00009453 int more;
Eric Andersencb57d552001-06-28 07:25:16 +00009454
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009455 while (g_parsefile->strpush) {
Denis Vlasenko131ae172007-02-18 13:00:19 +00009456#if ENABLE_ASH_ALIAS
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009457 if (g_parsefile->left_in_line == -1
9458 && g_parsefile->strpush->ap
9459 && g_parsefile->next_to_pgetc[-1] != ' '
9460 && g_parsefile->next_to_pgetc[-1] != '\t'
Denis Vlasenko16898402008-11-25 01:34:52 +00009461 ) {
Denis Vlasenko727752d2008-11-28 03:41:47 +00009462 pgetc_debug("preadbuffer PEOA");
Eric Andersencb57d552001-06-28 07:25:16 +00009463 return PEOA;
9464 }
Eric Andersen2870d962001-07-02 17:27:21 +00009465#endif
Eric Andersencb57d552001-06-28 07:25:16 +00009466 popstring();
Denis Vlasenko727752d2008-11-28 03:41:47 +00009467 /* try "pgetc" now: */
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009468 pgetc_debug("preadbuffer internal pgetc at %d:%p'%s'",
9469 g_parsefile->left_in_line,
9470 g_parsefile->next_to_pgetc,
9471 g_parsefile->next_to_pgetc);
9472 if (--g_parsefile->left_in_line >= 0)
9473 return (unsigned char)(*g_parsefile->next_to_pgetc++);
Eric Andersencb57d552001-06-28 07:25:16 +00009474 }
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009475 /* on both branches above g_parsefile->left_in_line < 0.
Denis Vlasenko727752d2008-11-28 03:41:47 +00009476 * "pgetc" needs refilling.
9477 */
9478
Denis Vlasenkoe27dafd2008-11-28 04:01:03 +00009479 /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read",
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009480 * pungetc() may increment it a few times.
Denis Vlasenkoe27dafd2008-11-28 04:01:03 +00009481 * Assuming it won't increment it to less than -90.
Denis Vlasenko727752d2008-11-28 03:41:47 +00009482 */
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009483 if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) {
Denis Vlasenko727752d2008-11-28 03:41:47 +00009484 pgetc_debug("preadbuffer PEOF1");
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009485 /* even in failure keep left_in_line and next_to_pgetc
9486 * in lock step, for correct multi-layer pungetc.
9487 * left_in_line was decremented before preadbuffer(),
9488 * must inc next_to_pgetc: */
9489 g_parsefile->next_to_pgetc++;
Eric Andersencb57d552001-06-28 07:25:16 +00009490 return PEOF;
Denis Vlasenko727752d2008-11-28 03:41:47 +00009491 }
Eric Andersencb57d552001-06-28 07:25:16 +00009492
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009493 more = g_parsefile->left_in_buffer;
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009494 if (more <= 0) {
Denis Vlasenko727752d2008-11-28 03:41:47 +00009495 flush_stdout_stderr();
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009496 again:
9497 more = preadfd();
9498 if (more <= 0) {
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009499 /* don't try reading again */
9500 g_parsefile->left_in_line = -99;
Denis Vlasenko727752d2008-11-28 03:41:47 +00009501 pgetc_debug("preadbuffer PEOF2");
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009502 g_parsefile->next_to_pgetc++;
Eric Andersencb57d552001-06-28 07:25:16 +00009503 return PEOF;
9504 }
9505 }
9506
Denis Vlasenko727752d2008-11-28 03:41:47 +00009507 /* Find out where's the end of line.
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009508 * Set g_parsefile->left_in_line
9509 * and g_parsefile->left_in_buffer acordingly.
Denis Vlasenko727752d2008-11-28 03:41:47 +00009510 * NUL chars are deleted.
9511 */
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009512 q = g_parsefile->next_to_pgetc;
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009513 for (;;) {
Denis Vlasenko727752d2008-11-28 03:41:47 +00009514 char c;
Eric Andersencb57d552001-06-28 07:25:16 +00009515
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009516 more--;
Eric Andersenc470f442003-07-28 09:56:35 +00009517
Denis Vlasenko727752d2008-11-28 03:41:47 +00009518 c = *q;
9519 if (c == '\0') {
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009520 memmove(q, q + 1, more);
Denis Vlasenko727752d2008-11-28 03:41:47 +00009521 } else {
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009522 q++;
9523 if (c == '\n') {
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009524 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009525 break;
9526 }
Eric Andersencb57d552001-06-28 07:25:16 +00009527 }
9528
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009529 if (more <= 0) {
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009530 g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1;
9531 if (g_parsefile->left_in_line < 0)
Eric Andersencb57d552001-06-28 07:25:16 +00009532 goto again;
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009533 break;
Eric Andersencb57d552001-06-28 07:25:16 +00009534 }
9535 }
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009536 g_parsefile->left_in_buffer = more;
Eric Andersencb57d552001-06-28 07:25:16 +00009537
Eric Andersencb57d552001-06-28 07:25:16 +00009538 if (vflag) {
Denis Vlasenko727752d2008-11-28 03:41:47 +00009539 char save = *q;
9540 *q = '\0';
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009541 out2str(g_parsefile->next_to_pgetc);
Denis Vlasenko727752d2008-11-28 03:41:47 +00009542 *q = save;
Eric Andersencb57d552001-06-28 07:25:16 +00009543 }
9544
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009545 pgetc_debug("preadbuffer at %d:%p'%s'",
9546 g_parsefile->left_in_line,
9547 g_parsefile->next_to_pgetc,
9548 g_parsefile->next_to_pgetc);
Denis Vlasenko68819d12008-12-15 11:26:36 +00009549 return signed_char2int(*g_parsefile->next_to_pgetc++);
Eric Andersencb57d552001-06-28 07:25:16 +00009550}
9551
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009552#define pgetc_as_macro() \
9553 (--g_parsefile->left_in_line >= 0 \
Denis Vlasenko68819d12008-12-15 11:26:36 +00009554 ? signed_char2int(*g_parsefile->next_to_pgetc++) \
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009555 : preadbuffer() \
9556 )
Denis Vlasenko727752d2008-11-28 03:41:47 +00009557
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009558static int
9559pgetc(void)
9560{
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009561 pgetc_debug("pgetc_fast at %d:%p'%s'",
9562 g_parsefile->left_in_line,
9563 g_parsefile->next_to_pgetc,
9564 g_parsefile->next_to_pgetc);
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009565 return pgetc_as_macro();
9566}
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00009567
9568#if ENABLE_ASH_OPTIMIZE_FOR_SIZE
Denis Vlasenko834dee72008-10-07 09:18:30 +00009569#define pgetc_fast() pgetc()
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009570#else
Denis Vlasenko834dee72008-10-07 09:18:30 +00009571#define pgetc_fast() pgetc_as_macro()
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009572#endif
9573
9574/*
9575 * Same as pgetc(), but ignores PEOA.
9576 */
9577#if ENABLE_ASH_ALIAS
9578static int
9579pgetc2(void)
9580{
9581 int c;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009582 do {
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009583 pgetc_debug("pgetc_fast at %d:%p'%s'",
9584 g_parsefile->left_in_line,
9585 g_parsefile->next_to_pgetc,
9586 g_parsefile->next_to_pgetc);
Denis Vlasenko834dee72008-10-07 09:18:30 +00009587 c = pgetc_fast();
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009588 } while (c == PEOA);
9589 return c;
9590}
9591#else
Denis Vlasenko834dee72008-10-07 09:18:30 +00009592#define pgetc2() pgetc()
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009593#endif
9594
9595/*
9596 * Read a line from the script.
9597 */
9598static char *
9599pfgets(char *line, int len)
9600{
9601 char *p = line;
9602 int nleft = len;
9603 int c;
9604
9605 while (--nleft > 0) {
9606 c = pgetc2();
9607 if (c == PEOF) {
9608 if (p == line)
9609 return NULL;
9610 break;
9611 }
9612 *p++ = c;
9613 if (c == '\n')
9614 break;
9615 }
9616 *p = '\0';
9617 return line;
9618}
9619
Eric Andersenc470f442003-07-28 09:56:35 +00009620/*
9621 * Undo the last call to pgetc. Only one character may be pushed back.
9622 * PEOF may be pushed back.
9623 */
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009624static void
Eric Andersenc470f442003-07-28 09:56:35 +00009625pungetc(void)
9626{
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009627 g_parsefile->left_in_line++;
9628 g_parsefile->next_to_pgetc--;
9629 pgetc_debug("pushed back to %d:%p'%s'",
9630 g_parsefile->left_in_line,
9631 g_parsefile->next_to_pgetc,
9632 g_parsefile->next_to_pgetc);
Eric Andersencb57d552001-06-28 07:25:16 +00009633}
9634
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009635/*
9636 * To handle the "." command, a stack of input files is used. Pushfile
9637 * adds a new entry to the stack and popfile restores the previous level.
9638 */
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009639static void
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009640pushfile(void)
Eric Andersenc470f442003-07-28 09:56:35 +00009641{
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009642 struct parsefile *pf;
9643
Denis Vlasenko597906c2008-02-20 16:38:54 +00009644 pf = ckzalloc(sizeof(*pf));
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009645 pf->prev = g_parsefile;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009646 pf->fd = -1;
Denis Vlasenko597906c2008-02-20 16:38:54 +00009647 /*pf->strpush = NULL; - ckzalloc did it */
9648 /*pf->basestrpush.prev = NULL;*/
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009649 g_parsefile = pf;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009650}
9651
9652static void
9653popfile(void)
9654{
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009655 struct parsefile *pf = g_parsefile;
Eric Andersenc470f442003-07-28 09:56:35 +00009656
Denis Vlasenkob012b102007-02-19 22:43:01 +00009657 INT_OFF;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009658 if (pf->fd >= 0)
9659 close(pf->fd);
Denis Vlasenko60818682007-09-28 22:07:23 +00009660 free(pf->buf);
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009661 while (pf->strpush)
9662 popstring();
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009663 g_parsefile = pf->prev;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009664 free(pf);
Denis Vlasenkob012b102007-02-19 22:43:01 +00009665 INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +00009666}
9667
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009668/*
9669 * Return to top level.
9670 */
9671static void
9672popallfiles(void)
9673{
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009674 while (g_parsefile != &basepf)
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009675 popfile();
9676}
9677
9678/*
9679 * Close the file(s) that the shell is reading commands from. Called
9680 * after a fork is done.
9681 */
9682static void
9683closescript(void)
9684{
9685 popallfiles();
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009686 if (g_parsefile->fd > 0) {
9687 close(g_parsefile->fd);
9688 g_parsefile->fd = 0;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009689 }
9690}
9691
9692/*
9693 * Like setinputfile, but takes an open file descriptor. Call this with
9694 * interrupts off.
9695 */
9696static void
9697setinputfd(int fd, int push)
9698{
Denis Vlasenko96e1b382007-09-30 23:50:48 +00009699 close_on_exec_on(fd);
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009700 if (push) {
9701 pushfile();
Denis Vlasenko727752d2008-11-28 03:41:47 +00009702 g_parsefile->buf = NULL;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009703 }
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009704 g_parsefile->fd = fd;
9705 if (g_parsefile->buf == NULL)
9706 g_parsefile->buf = ckmalloc(IBUFSIZ);
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009707 g_parsefile->left_in_buffer = 0;
9708 g_parsefile->left_in_line = 0;
9709 g_parsefile->linno = 1;
Denis Vlasenko4d2183b2007-02-23 01:05:38 +00009710}
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009711
Eric Andersenc470f442003-07-28 09:56:35 +00009712/*
9713 * Set the input to take input from a file. If push is set, push the
9714 * old input onto the stack first.
9715 */
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009716static int
9717setinputfile(const char *fname, int flags)
Eric Andersenc470f442003-07-28 09:56:35 +00009718{
9719 int fd;
9720 int fd2;
9721
Denis Vlasenkob012b102007-02-19 22:43:01 +00009722 INT_OFF;
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009723 fd = open(fname, O_RDONLY);
9724 if (fd < 0) {
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009725 if (flags & INPUT_NOFILE_OK)
9726 goto out;
Denis Vlasenko9604e1b2009-03-03 18:47:56 +00009727 ash_msg_and_raise_error("can't open '%s'", fname);
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009728 }
Eric Andersenc470f442003-07-28 09:56:35 +00009729 if (fd < 10) {
9730 fd2 = copyfd(fd, 10);
9731 close(fd);
9732 if (fd2 < 0)
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +00009733 ash_msg_and_raise_error("out of file descriptors");
Eric Andersenc470f442003-07-28 09:56:35 +00009734 fd = fd2;
9735 }
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009736 setinputfd(fd, flags & INPUT_PUSH_FILE);
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009737 out:
Denis Vlasenkob012b102007-02-19 22:43:01 +00009738 INT_ON;
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +00009739 return fd;
Eric Andersenc470f442003-07-28 09:56:35 +00009740}
9741
Eric Andersencb57d552001-06-28 07:25:16 +00009742/*
9743 * Like setinputfile, but takes input from a string.
9744 */
Eric Andersenc470f442003-07-28 09:56:35 +00009745static void
9746setinputstring(char *string)
Eric Andersen62483552001-07-10 06:09:16 +00009747{
Denis Vlasenkob012b102007-02-19 22:43:01 +00009748 INT_OFF;
Eric Andersencb57d552001-06-28 07:25:16 +00009749 pushfile();
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009750 g_parsefile->next_to_pgetc = string;
9751 g_parsefile->left_in_line = strlen(string);
Denis Vlasenkob07a4962008-06-22 13:16:23 +00009752 g_parsefile->buf = NULL;
Denis Vlasenko41eb3002008-11-28 03:42:31 +00009753 g_parsefile->linno = 1;
Denis Vlasenkob012b102007-02-19 22:43:01 +00009754 INT_ON;
Eric Andersencb57d552001-06-28 07:25:16 +00009755}
9756
9757
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00009758/* ============ mail.c
9759 *
9760 * Routines to check for mail.
Eric Andersencb57d552001-06-28 07:25:16 +00009761 */
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00009762
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00009763#if ENABLE_ASH_MAIL
Eric Andersencb57d552001-06-28 07:25:16 +00009764
Eric Andersencb57d552001-06-28 07:25:16 +00009765#define MAXMBOXES 10
9766
Eric Andersenc470f442003-07-28 09:56:35 +00009767/* times of mailboxes */
9768static time_t mailtime[MAXMBOXES];
9769/* Set if MAIL or MAILPATH is changed. */
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +00009770static smallint mail_var_path_changed;
Eric Andersencb57d552001-06-28 07:25:16 +00009771
Eric Andersencb57d552001-06-28 07:25:16 +00009772/*
Eric Andersenc470f442003-07-28 09:56:35 +00009773 * Print appropriate message(s) if mail has arrived.
9774 * If mail_var_path_changed is set,
9775 * then the value of MAIL has mail_var_path_changed,
9776 * so we just update the values.
Eric Andersencb57d552001-06-28 07:25:16 +00009777 */
Eric Andersenc470f442003-07-28 09:56:35 +00009778static void
9779chkmail(void)
Eric Andersencb57d552001-06-28 07:25:16 +00009780{
Eric Andersencb57d552001-06-28 07:25:16 +00009781 const char *mpath;
9782 char *p;
9783 char *q;
Eric Andersenc470f442003-07-28 09:56:35 +00009784 time_t *mtp;
Eric Andersencb57d552001-06-28 07:25:16 +00009785 struct stackmark smark;
9786 struct stat statb;
9787
Eric Andersencb57d552001-06-28 07:25:16 +00009788 setstackmark(&smark);
Eric Andersenc470f442003-07-28 09:56:35 +00009789 mpath = mpathset() ? mpathval() : mailval();
9790 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
Denys Vlasenko82a6fb32009-06-14 19:42:12 +02009791 p = path_advance(&mpath, nullstr);
Eric Andersencb57d552001-06-28 07:25:16 +00009792 if (p == NULL)
9793 break;
9794 if (*p == '\0')
9795 continue;
Denis Vlasenkof7d56652008-03-25 05:51:41 +00009796 for (q = p; *q; q++)
9797 continue;
Denis Vlasenkoa7189f02006-11-17 20:29:00 +00009798#if DEBUG
Eric Andersencb57d552001-06-28 07:25:16 +00009799 if (q[-1] != '/')
9800 abort();
9801#endif
Eric Andersenc470f442003-07-28 09:56:35 +00009802 q[-1] = '\0'; /* delete trailing '/' */
9803 if (stat(p, &statb) < 0) {
9804 *mtp = 0;
9805 continue;
Eric Andersencb57d552001-06-28 07:25:16 +00009806 }
Eric Andersenc470f442003-07-28 09:56:35 +00009807 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
9808 fprintf(
9809 stderr, snlfmt,
9810 pathopt ? pathopt : "you have mail"
9811 );
9812 }
9813 *mtp = statb.st_mtime;
Eric Andersencb57d552001-06-28 07:25:16 +00009814 }
Eric Andersenc470f442003-07-28 09:56:35 +00009815 mail_var_path_changed = 0;
Eric Andersencb57d552001-06-28 07:25:16 +00009816 popstackmark(&smark);
9817}
Eric Andersencb57d552001-06-28 07:25:16 +00009818
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009819static void FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00009820changemail(const char *val UNUSED_PARAM)
Eric Andersenc470f442003-07-28 09:56:35 +00009821{
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +00009822 mail_var_path_changed = 1;
Eric Andersenc470f442003-07-28 09:56:35 +00009823}
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +00009824
Denis Vlasenko131ae172007-02-18 13:00:19 +00009825#endif /* ASH_MAIL */
Eric Andersenc470f442003-07-28 09:56:35 +00009826
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00009827
9828/* ============ ??? */
9829
Eric Andersencb57d552001-06-28 07:25:16 +00009830/*
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009831 * Set the shell parameters.
Eric Andersencb57d552001-06-28 07:25:16 +00009832 */
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009833static void
9834setparam(char **argv)
Eric Andersencb57d552001-06-28 07:25:16 +00009835{
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009836 char **newparam;
9837 char **ap;
9838 int nparam;
Eric Andersencb57d552001-06-28 07:25:16 +00009839
Denis Vlasenkof7d56652008-03-25 05:51:41 +00009840 for (nparam = 0; argv[nparam]; nparam++)
9841 continue;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009842 ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap));
9843 while (*argv) {
9844 *ap++ = ckstrdup(*argv++);
Eric Andersencb57d552001-06-28 07:25:16 +00009845 }
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009846 *ap = NULL;
9847 freeparam(&shellparam);
Denis Vlasenko01631112007-12-16 17:20:38 +00009848 shellparam.malloced = 1;
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009849 shellparam.nparam = nparam;
9850 shellparam.p = newparam;
9851#if ENABLE_ASH_GETOPTS
9852 shellparam.optind = 1;
9853 shellparam.optoff = -1;
9854#endif
Eric Andersencb57d552001-06-28 07:25:16 +00009855}
9856
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00009857/*
Denis Vlasenko0dec6de2007-02-23 21:10:47 +00009858 * Process shell options. The global variable argptr contains a pointer
9859 * to the argument list; we advance it past the options.
Denis Vlasenko94e87bc2008-02-14 16:51:58 +00009860 *
9861 * SUSv3 section 2.8.1 "Consequences of Shell Errors" says:
9862 * For a non-interactive shell, an error condition encountered
9863 * by a special built-in ... shall cause the shell to write a diagnostic message
9864 * to standard error and exit as shown in the following table:
Denis Vlasenko56244732008-02-17 15:14:04 +00009865 * Error Special Built-In
Denis Vlasenko94e87bc2008-02-14 16:51:58 +00009866 * ...
9867 * Utility syntax error (option or operand error) Shall exit
9868 * ...
9869 * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142)
9870 * we see that bash does not do that (set "finishes" with error code 1 instead,
9871 * and shell continues), and people rely on this behavior!
9872 * Testcase:
9873 * set -o barfoo 2>/dev/null
9874 * echo $?
9875 *
9876 * Oh well. Let's mimic that.
Denis Vlasenkobc54cff2007-02-23 01:05:52 +00009877 */
Denis Vlasenko28bf6712008-02-14 15:01:47 +00009878static int
Denis Vlasenkodddfaff2008-05-06 15:30:27 +00009879plus_minus_o(char *name, int val)
Eric Andersen62483552001-07-10 06:09:16 +00009880{
9881 int i;
9882
Denis Vlasenkoa624c112007-02-19 22:45:43 +00009883 if (name) {
9884 for (i = 0; i < NOPTS; i++) {
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +00009885 if (strcmp(name, optnames(i)) == 0) {
Eric Andersenc470f442003-07-28 09:56:35 +00009886 optlist[i] = val;
Denis Vlasenko28bf6712008-02-14 15:01:47 +00009887 return 0;
Eric Andersen62483552001-07-10 06:09:16 +00009888 }
Denis Vlasenkoa624c112007-02-19 22:45:43 +00009889 }
Denis Vlasenkodddfaff2008-05-06 15:30:27 +00009890 ash_msg("illegal option %co %s", val ? '-' : '+', name);
Denis Vlasenko28bf6712008-02-14 15:01:47 +00009891 return 1;
Eric Andersen62483552001-07-10 06:09:16 +00009892 }
Denis Vlasenko6b06cb82008-05-15 21:30:45 +00009893 for (i = 0; i < NOPTS; i++) {
Denis Vlasenkodddfaff2008-05-06 15:30:27 +00009894 if (val) {
9895 out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off");
9896 } else {
9897 out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i));
9898 }
Denis Vlasenko6b06cb82008-05-15 21:30:45 +00009899 }
Denis Vlasenko28bf6712008-02-14 15:01:47 +00009900 return 0;
Eric Andersen62483552001-07-10 06:09:16 +00009901}
Denis Vlasenkoaa744452007-02-23 01:04:22 +00009902static void
9903setoption(int flag, int val)
9904{
9905 int i;
9906
9907 for (i = 0; i < NOPTS; i++) {
9908 if (optletters(i) == flag) {
9909 optlist[i] = val;
9910 return;
9911 }
9912 }
Denis Vlasenkodddfaff2008-05-06 15:30:27 +00009913 ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag);
Denis Vlasenkoaa744452007-02-23 01:04:22 +00009914 /* NOTREACHED */
9915}
Denis Vlasenko28bf6712008-02-14 15:01:47 +00009916static int
Eric Andersenc470f442003-07-28 09:56:35 +00009917options(int cmdline)
Eric Andersencb57d552001-06-28 07:25:16 +00009918{
9919 char *p;
9920 int val;
9921 int c;
9922
9923 if (cmdline)
9924 minusc = NULL;
9925 while ((p = *argptr) != NULL) {
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009926 c = *p++;
Denis Vlasenko8fdc4b72007-07-14 11:33:10 +00009927 if (c != '-' && c != '+')
9928 break;
9929 argptr++;
9930 val = 0; /* val = 0 if c == '+' */
Denis Vlasenko5cedb752007-02-18 19:56:41 +00009931 if (c == '-') {
Eric Andersencb57d552001-06-28 07:25:16 +00009932 val = 1;
Denis Vlasenko9f739442006-12-16 23:49:13 +00009933 if (p[0] == '\0' || LONE_DASH(p)) {
Eric Andersen2870d962001-07-02 17:27:21 +00009934 if (!cmdline) {
9935 /* "-" means turn off -x and -v */
9936 if (p[0] == '\0')
9937 xflag = vflag = 0;
9938 /* "--" means reset params */
9939 else if (*argptr == NULL)
Eric Andersencb57d552001-06-28 07:25:16 +00009940 setparam(argptr);
Eric Andersen2870d962001-07-02 17:27:21 +00009941 }
Eric Andersenc470f442003-07-28 09:56:35 +00009942 break; /* "-" or "--" terminates options */
Eric Andersencb57d552001-06-28 07:25:16 +00009943 }
Eric Andersencb57d552001-06-28 07:25:16 +00009944 }
Denis Vlasenko8fdc4b72007-07-14 11:33:10 +00009945 /* first char was + or - */
Eric Andersencb57d552001-06-28 07:25:16 +00009946 while ((c = *p++) != '\0') {
Denis Vlasenko8fdc4b72007-07-14 11:33:10 +00009947 /* bash 3.2 indeed handles -c CMD and +c CMD the same */
Eric Andersencb57d552001-06-28 07:25:16 +00009948 if (c == 'c' && cmdline) {
Denis Vlasenko8fdc4b72007-07-14 11:33:10 +00009949 minusc = p; /* command is after shell args */
Eric Andersencb57d552001-06-28 07:25:16 +00009950 } else if (c == 'o') {
Denis Vlasenkodddfaff2008-05-06 15:30:27 +00009951 if (plus_minus_o(*argptr, val)) {
Denis Vlasenko28bf6712008-02-14 15:01:47 +00009952 /* it already printed err message */
9953 return 1; /* error */
9954 }
Eric Andersencb57d552001-06-28 07:25:16 +00009955 if (*argptr)
9956 argptr++;
Denis Vlasenko8fdc4b72007-07-14 11:33:10 +00009957 } else if (cmdline && (c == 'l')) { /* -l or +l == --login */
9958 isloginsh = 1;
9959 /* bash does not accept +-login, we also won't */
9960 } else if (cmdline && val && (c == '-')) { /* long options */
Glenn L McGrath9fef17d2002-08-22 18:41:20 +00009961 if (strcmp(p, "login") == 0)
Robert Griebl64f70cc2002-05-14 23:22:06 +00009962 isloginsh = 1;
9963 break;
Eric Andersencb57d552001-06-28 07:25:16 +00009964 } else {
9965 setoption(c, val);
9966 }
9967 }
9968 }
Denis Vlasenko28bf6712008-02-14 15:01:47 +00009969 return 0;
Eric Andersencb57d552001-06-28 07:25:16 +00009970}
9971
Eric Andersencb57d552001-06-28 07:25:16 +00009972/*
Eric Andersencb57d552001-06-28 07:25:16 +00009973 * The shift builtin command.
9974 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +02009975static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00009976shiftcmd(int argc UNUSED_PARAM, char **argv)
Eric Andersencb57d552001-06-28 07:25:16 +00009977{
9978 int n;
9979 char **ap1, **ap2;
9980
9981 n = 1;
Denis Vlasenko68404f12008-03-17 09:00:54 +00009982 if (argv[1])
Eric Andersencb57d552001-06-28 07:25:16 +00009983 n = number(argv[1]);
9984 if (n > shellparam.nparam)
Denis Vlasenkoc90e1be2008-07-30 15:35:05 +00009985 n = 0; /* bash compat, was = shellparam.nparam; */
Denis Vlasenkob012b102007-02-19 22:43:01 +00009986 INT_OFF;
Eric Andersencb57d552001-06-28 07:25:16 +00009987 shellparam.nparam -= n;
Denis Vlasenko2da584f2007-02-19 22:44:05 +00009988 for (ap1 = shellparam.p; --n >= 0; ap1++) {
Denis Vlasenko01631112007-12-16 17:20:38 +00009989 if (shellparam.malloced)
Denis Vlasenkob012b102007-02-19 22:43:01 +00009990 free(*ap1);
Eric Andersencb57d552001-06-28 07:25:16 +00009991 }
9992 ap2 = shellparam.p;
Denis Vlasenkof7d56652008-03-25 05:51:41 +00009993 while ((*ap2++ = *ap1++) != NULL)
9994 continue;
Denis Vlasenko131ae172007-02-18 13:00:19 +00009995#if ENABLE_ASH_GETOPTS
Eric Andersencb57d552001-06-28 07:25:16 +00009996 shellparam.optind = 1;
9997 shellparam.optoff = -1;
Eric Andersenc470f442003-07-28 09:56:35 +00009998#endif
Denis Vlasenkob012b102007-02-19 22:43:01 +00009999 INT_ON;
Eric Andersencb57d552001-06-28 07:25:16 +000010000 return 0;
10001}
10002
Eric Andersencb57d552001-06-28 07:25:16 +000010003/*
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010004 * POSIX requires that 'set' (but not export or readonly) output the
10005 * variables in lexicographic order - by the locale's collating order (sigh).
10006 * Maybe we could keep them in an ordered balanced binary tree
10007 * instead of hashed lists.
10008 * For now just roll 'em through qsort for printing...
10009 */
10010static int
10011showvars(const char *sep_prefix, int on, int off)
10012{
10013 const char *sep;
10014 char **ep, **epend;
10015
10016 ep = listvars(on, off, &epend);
10017 qsort(ep, epend - ep, sizeof(char *), vpcmp);
10018
Denis Vlasenko2de3d9f2007-02-23 21:10:23 +000010019 sep = *sep_prefix ? " " : sep_prefix;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010020
10021 for (; ep < epend; ep++) {
10022 const char *p;
10023 const char *q;
10024
10025 p = strchrnul(*ep, '=');
10026 q = nullstr;
10027 if (*p)
10028 q = single_quote(++p);
10029 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
10030 }
10031 return 0;
10032}
10033
10034/*
Eric Andersencb57d552001-06-28 07:25:16 +000010035 * The set command builtin.
10036 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010037static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000010038setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Eric Andersencb57d552001-06-28 07:25:16 +000010039{
Denis Vlasenko28bf6712008-02-14 15:01:47 +000010040 int retval;
10041
Denis Vlasenko68404f12008-03-17 09:00:54 +000010042 if (!argv[1])
Eric Andersenc470f442003-07-28 09:56:35 +000010043 return showvars(nullstr, 0, VUNSET);
Denis Vlasenkob012b102007-02-19 22:43:01 +000010044 INT_OFF;
Denis Vlasenko28bf6712008-02-14 15:01:47 +000010045 retval = 1;
10046 if (!options(0)) { /* if no parse error... */
10047 retval = 0;
10048 optschanged();
10049 if (*argptr != NULL) {
10050 setparam(argptr);
10051 }
Eric Andersencb57d552001-06-28 07:25:16 +000010052 }
Denis Vlasenkob012b102007-02-19 22:43:01 +000010053 INT_ON;
Denis Vlasenko28bf6712008-02-14 15:01:47 +000010054 return retval;
Eric Andersencb57d552001-06-28 07:25:16 +000010055}
10056
Denis Vlasenko131ae172007-02-18 13:00:19 +000010057#if ENABLE_ASH_RANDOM_SUPPORT
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010058static void FAST_FUNC
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +000010059change_random(const char *value)
Eric Andersenef02f822004-03-11 13:34:24 +000010060{
Denis Vlasenko448d30e2008-06-27 00:24:11 +000010061 /* Galois LFSR parameter */
10062 /* Taps at 32 31 29 1: */
10063 enum { MASK = 0x8000000b };
10064 /* Another example - taps at 32 31 30 10: */
10065 /* MASK = 0x00400007 */
10066
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000010067 if (value == NULL) {
Eric Andersen16767e22004-03-16 05:14:10 +000010068 /* "get", generate */
Denis Vlasenko448d30e2008-06-27 00:24:11 +000010069 uint32_t t;
Eric Andersen16767e22004-03-16 05:14:10 +000010070
Denis Vlasenko448d30e2008-06-27 00:24:11 +000010071 /* LCG has period of 2^32 and alternating lowest bit */
10072 random_LCG = 1664525 * random_LCG + 1013904223;
10073 /* Galois LFSR has period of 2^32-1 = 3 * 5 * 17 * 257 * 65537 */
10074 t = (random_galois_LFSR << 1);
10075 if (random_galois_LFSR < 0) /* if we just shifted 1 out of msb... */
10076 t ^= MASK;
10077 random_galois_LFSR = t;
Denis Vlasenkoce13b762008-06-29 02:25:53 +000010078 /* Both are weak, combining them gives better randomness
Denis Vlasenko448d30e2008-06-27 00:24:11 +000010079 * and ~2^64 period. & 0x7fff is probably bash compat
Denis Vlasenkoce13b762008-06-29 02:25:53 +000010080 * for $RANDOM range. Combining with subtraction is
10081 * just for fun. + and ^ would work equally well. */
10082 t = (t - random_LCG) & 0x7fff;
Eric Andersen16767e22004-03-16 05:14:10 +000010083 /* set without recursion */
Denis Vlasenko448d30e2008-06-27 00:24:11 +000010084 setvar(vrandom.text, utoa(t), VNOFUNC);
Eric Andersen16767e22004-03-16 05:14:10 +000010085 vrandom.flags &= ~VNOFUNC;
10086 } else {
10087 /* set/reset */
Denys Vlasenko1f27ab02009-09-23 17:17:53 +020010088 random_galois_LFSR = random_LCG = strtoul(value, NULL, 10);
Eric Andersen16767e22004-03-16 05:14:10 +000010089 }
Eric Andersenef02f822004-03-11 13:34:24 +000010090}
Eric Andersen16767e22004-03-16 05:14:10 +000010091#endif
10092
Denis Vlasenko131ae172007-02-18 13:00:19 +000010093#if ENABLE_ASH_GETOPTS
Eric Andersencb57d552001-06-28 07:25:16 +000010094static int
Eric Andersenc470f442003-07-28 09:56:35 +000010095getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
Eric Andersencb57d552001-06-28 07:25:16 +000010096{
10097 char *p, *q;
10098 char c = '?';
10099 int done = 0;
10100 int err = 0;
Eric Andersena48b0a32003-10-22 10:56:47 +000010101 char s[12];
10102 char **optnext;
Eric Andersencb57d552001-06-28 07:25:16 +000010103
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000010104 if (*param_optind < 1)
Eric Andersena48b0a32003-10-22 10:56:47 +000010105 return 1;
10106 optnext = optfirst + *param_optind - 1;
10107
Denis Vlasenko6b06cb82008-05-15 21:30:45 +000010108 if (*param_optind <= 1 || *optoff < 0 || (int)strlen(optnext[-1]) < *optoff)
Eric Andersencb57d552001-06-28 07:25:16 +000010109 p = NULL;
10110 else
Eric Andersena48b0a32003-10-22 10:56:47 +000010111 p = optnext[-1] + *optoff;
Eric Andersencb57d552001-06-28 07:25:16 +000010112 if (p == NULL || *p == '\0') {
10113 /* Current word is done, advance */
Eric Andersencb57d552001-06-28 07:25:16 +000010114 p = *optnext;
10115 if (p == NULL || *p != '-' || *++p == '\0') {
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010116 atend:
Eric Andersencb57d552001-06-28 07:25:16 +000010117 p = NULL;
10118 done = 1;
10119 goto out;
10120 }
10121 optnext++;
Denis Vlasenko9f739442006-12-16 23:49:13 +000010122 if (LONE_DASH(p)) /* check for "--" */
Eric Andersencb57d552001-06-28 07:25:16 +000010123 goto atend;
10124 }
10125
10126 c = *p++;
Denis Vlasenko2f5d0cd2008-06-23 13:24:19 +000010127 for (q = optstr; *q != c;) {
Eric Andersencb57d552001-06-28 07:25:16 +000010128 if (*q == '\0') {
10129 if (optstr[0] == ':') {
10130 s[0] = c;
10131 s[1] = '\0';
10132 err |= setvarsafe("OPTARG", s, 0);
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000010133 } else {
Eric Andersenc470f442003-07-28 09:56:35 +000010134 fprintf(stderr, "Illegal option -%c\n", c);
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010135 unsetvar("OPTARG");
Eric Andersencb57d552001-06-28 07:25:16 +000010136 }
10137 c = '?';
Eric Andersenc470f442003-07-28 09:56:35 +000010138 goto out;
Eric Andersencb57d552001-06-28 07:25:16 +000010139 }
10140 if (*++q == ':')
10141 q++;
10142 }
10143
10144 if (*++q == ':') {
10145 if (*p == '\0' && (p = *optnext) == NULL) {
10146 if (optstr[0] == ':') {
10147 s[0] = c;
10148 s[1] = '\0';
10149 err |= setvarsafe("OPTARG", s, 0);
10150 c = ':';
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000010151 } else {
Eric Andersenc470f442003-07-28 09:56:35 +000010152 fprintf(stderr, "No arg for -%c option\n", c);
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010153 unsetvar("OPTARG");
Eric Andersencb57d552001-06-28 07:25:16 +000010154 c = '?';
10155 }
Eric Andersenc470f442003-07-28 09:56:35 +000010156 goto out;
Eric Andersencb57d552001-06-28 07:25:16 +000010157 }
10158
10159 if (p == *optnext)
10160 optnext++;
Eric Andersenc470f442003-07-28 09:56:35 +000010161 err |= setvarsafe("OPTARG", p, 0);
Eric Andersencb57d552001-06-28 07:25:16 +000010162 p = NULL;
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000010163 } else
Eric Andersenc470f442003-07-28 09:56:35 +000010164 err |= setvarsafe("OPTARG", nullstr, 0);
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010165 out:
Eric Andersencb57d552001-06-28 07:25:16 +000010166 *optoff = p ? p - *(optnext - 1) : -1;
Eric Andersenc470f442003-07-28 09:56:35 +000010167 *param_optind = optnext - optfirst + 1;
10168 fmtstr(s, sizeof(s), "%d", *param_optind);
Eric Andersencb57d552001-06-28 07:25:16 +000010169 err |= setvarsafe("OPTIND", s, VNOFUNC);
10170 s[0] = c;
10171 s[1] = '\0';
10172 err |= setvarsafe(optvar, s, 0);
10173 if (err) {
Eric Andersenc470f442003-07-28 09:56:35 +000010174 *param_optind = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010175 *optoff = -1;
Denis Vlasenkob012b102007-02-19 22:43:01 +000010176 flush_stdout_stderr();
10177 raise_exception(EXERROR);
Eric Andersencb57d552001-06-28 07:25:16 +000010178 }
10179 return done;
10180}
Eric Andersenc470f442003-07-28 09:56:35 +000010181
10182/*
10183 * The getopts builtin. Shellparam.optnext points to the next argument
10184 * to be processed. Shellparam.optptr points to the next character to
10185 * be processed in the current argument. If shellparam.optnext is NULL,
10186 * then it's the first time getopts has been called.
10187 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020010188static int FAST_FUNC
Eric Andersenc470f442003-07-28 09:56:35 +000010189getoptscmd(int argc, char **argv)
10190{
10191 char **optbase;
10192
10193 if (argc < 3)
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +000010194 ash_msg_and_raise_error("usage: getopts optstring var [arg]");
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010195 if (argc == 3) {
Eric Andersenc470f442003-07-28 09:56:35 +000010196 optbase = shellparam.p;
10197 if (shellparam.optind > shellparam.nparam + 1) {
10198 shellparam.optind = 1;
10199 shellparam.optoff = -1;
10200 }
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010201 } else {
Eric Andersenc470f442003-07-28 09:56:35 +000010202 optbase = &argv[3];
10203 if (shellparam.optind > argc - 2) {
10204 shellparam.optind = 1;
10205 shellparam.optoff = -1;
10206 }
10207 }
10208
10209 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000010210 &shellparam.optoff);
Eric Andersenc470f442003-07-28 09:56:35 +000010211}
Denis Vlasenko131ae172007-02-18 13:00:19 +000010212#endif /* ASH_GETOPTS */
Eric Andersencb57d552001-06-28 07:25:16 +000010213
Eric Andersencb57d552001-06-28 07:25:16 +000010214
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010215/* ============ Shell parser */
Eric Andersencb57d552001-06-28 07:25:16 +000010216
Denis Vlasenkob07a4962008-06-22 13:16:23 +000010217struct heredoc {
10218 struct heredoc *next; /* next here document in list */
10219 union node *here; /* redirection node */
10220 char *eofmark; /* string indicating end of input */
10221 smallint striptabs; /* if set, strip leading tabs */
10222};
10223
10224static smallint tokpushback; /* last token pushed back */
10225static smallint parsebackquote; /* nonzero if we are inside backquotes */
10226static smallint quoteflag; /* set if (part of) last token was quoted */
10227static token_id_t lasttoken; /* last token read (integer id Txxx) */
10228static struct heredoc *heredoclist; /* list of here documents to read */
10229static char *wordtext; /* text of last word returned by readtoken */
10230static struct nodelist *backquotelist;
10231static union node *redirnode;
10232static struct heredoc *heredoc;
Denis Vlasenko99eb8502007-02-23 21:09:49 +000010233
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010234/*
10235 * Called when an unexpected token is read during the parse. The argument
10236 * is the token that is expected, or -1 if more than one type of token can
10237 * occur at this point.
10238 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000010239static void raise_error_unexpected_syntax(int) NORETURN;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010240static void
10241raise_error_unexpected_syntax(int token)
10242{
10243 char msg[64];
10244 int l;
10245
Denis Vlasenko7b2294e2008-11-28 03:50:46 +000010246 l = sprintf(msg, "unexpected %s", tokname(lasttoken));
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010247 if (token >= 0)
10248 sprintf(msg + l, " (expecting %s)", tokname(token));
10249 raise_error_syntax(msg);
10250 /* NOTREACHED */
10251}
Eric Andersencb57d552001-06-28 07:25:16 +000010252
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010253#define EOFMARKLEN 79
Eric Andersencb57d552001-06-28 07:25:16 +000010254
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010255/* parsing is heavily cross-recursive, need these forward decls */
10256static union node *andor(void);
10257static union node *pipeline(void);
10258static union node *parse_command(void);
10259static void parseheredoc(void);
10260static char peektoken(void);
10261static int readtoken(void);
Eric Andersencb57d552001-06-28 07:25:16 +000010262
Eric Andersenc470f442003-07-28 09:56:35 +000010263static union node *
10264list(int nlflag)
Eric Andersencb57d552001-06-28 07:25:16 +000010265{
10266 union node *n1, *n2, *n3;
10267 int tok;
10268
Eric Andersenc470f442003-07-28 09:56:35 +000010269 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10270 if (nlflag == 2 && peektoken())
Eric Andersencb57d552001-06-28 07:25:16 +000010271 return NULL;
10272 n1 = NULL;
10273 for (;;) {
10274 n2 = andor();
10275 tok = readtoken();
10276 if (tok == TBACKGND) {
Eric Andersenc470f442003-07-28 09:56:35 +000010277 if (n2->type == NPIPE) {
Denis Vlasenko2dc240c2008-07-24 06:07:50 +000010278 n2->npipe.pipe_backgnd = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010279 } else {
Eric Andersenc470f442003-07-28 09:56:35 +000010280 if (n2->type != NREDIR) {
Denis Vlasenko597906c2008-02-20 16:38:54 +000010281 n3 = stzalloc(sizeof(struct nredir));
Eric Andersenc470f442003-07-28 09:56:35 +000010282 n3->nredir.n = n2;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010283 /*n3->nredir.redirect = NULL; - stzalloc did it */
Eric Andersenc470f442003-07-28 09:56:35 +000010284 n2 = n3;
10285 }
10286 n2->type = NBACKGND;
Eric Andersencb57d552001-06-28 07:25:16 +000010287 }
10288 }
10289 if (n1 == NULL) {
10290 n1 = n2;
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010291 } else {
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010292 n3 = stzalloc(sizeof(struct nbinary));
Eric Andersencb57d552001-06-28 07:25:16 +000010293 n3->type = NSEMI;
10294 n3->nbinary.ch1 = n1;
10295 n3->nbinary.ch2 = n2;
10296 n1 = n3;
10297 }
10298 switch (tok) {
10299 case TBACKGND:
10300 case TSEMI:
10301 tok = readtoken();
10302 /* fall through */
10303 case TNL:
10304 if (tok == TNL) {
10305 parseheredoc();
Eric Andersenc470f442003-07-28 09:56:35 +000010306 if (nlflag == 1)
Eric Andersencb57d552001-06-28 07:25:16 +000010307 return n1;
10308 } else {
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010309 tokpushback = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010310 }
Eric Andersenc470f442003-07-28 09:56:35 +000010311 checkkwd = CHKNL | CHKKWD | CHKALIAS;
Manuel Novoa III 16815d42001-08-10 19:36:07 +000010312 if (peektoken())
Eric Andersencb57d552001-06-28 07:25:16 +000010313 return n1;
10314 break;
10315 case TEOF:
10316 if (heredoclist)
10317 parseheredoc();
10318 else
Eric Andersenc470f442003-07-28 09:56:35 +000010319 pungetc(); /* push back EOF on input */
Eric Andersencb57d552001-06-28 07:25:16 +000010320 return n1;
10321 default:
Eric Andersenc470f442003-07-28 09:56:35 +000010322 if (nlflag == 1)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010323 raise_error_unexpected_syntax(-1);
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010324 tokpushback = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010325 return n1;
10326 }
10327 }
10328}
10329
Eric Andersenc470f442003-07-28 09:56:35 +000010330static union node *
10331andor(void)
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000010332{
Eric Andersencb57d552001-06-28 07:25:16 +000010333 union node *n1, *n2, *n3;
10334 int t;
10335
Eric Andersencb57d552001-06-28 07:25:16 +000010336 n1 = pipeline();
10337 for (;;) {
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010338 t = readtoken();
10339 if (t == TAND) {
Eric Andersencb57d552001-06-28 07:25:16 +000010340 t = NAND;
10341 } else if (t == TOR) {
10342 t = NOR;
10343 } else {
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010344 tokpushback = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010345 return n1;
10346 }
Eric Andersenc470f442003-07-28 09:56:35 +000010347 checkkwd = CHKNL | CHKKWD | CHKALIAS;
Eric Andersencb57d552001-06-28 07:25:16 +000010348 n2 = pipeline();
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010349 n3 = stzalloc(sizeof(struct nbinary));
Eric Andersencb57d552001-06-28 07:25:16 +000010350 n3->type = t;
10351 n3->nbinary.ch1 = n1;
10352 n3->nbinary.ch2 = n2;
10353 n1 = n3;
10354 }
10355}
10356
Eric Andersenc470f442003-07-28 09:56:35 +000010357static union node *
10358pipeline(void)
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000010359{
Eric Andersencb57d552001-06-28 07:25:16 +000010360 union node *n1, *n2, *pipenode;
10361 struct nodelist *lp, *prev;
10362 int negate;
10363
10364 negate = 0;
10365 TRACE(("pipeline: entered\n"));
10366 if (readtoken() == TNOT) {
10367 negate = !negate;
Eric Andersenc470f442003-07-28 09:56:35 +000010368 checkkwd = CHKKWD | CHKALIAS;
Eric Andersencb57d552001-06-28 07:25:16 +000010369 } else
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010370 tokpushback = 1;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010371 n1 = parse_command();
Eric Andersencb57d552001-06-28 07:25:16 +000010372 if (readtoken() == TPIPE) {
Denis Vlasenko597906c2008-02-20 16:38:54 +000010373 pipenode = stzalloc(sizeof(struct npipe));
Eric Andersencb57d552001-06-28 07:25:16 +000010374 pipenode->type = NPIPE;
Denis Vlasenko2dc240c2008-07-24 06:07:50 +000010375 /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010376 lp = stzalloc(sizeof(struct nodelist));
Eric Andersencb57d552001-06-28 07:25:16 +000010377 pipenode->npipe.cmdlist = lp;
10378 lp->n = n1;
10379 do {
10380 prev = lp;
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010381 lp = stzalloc(sizeof(struct nodelist));
Eric Andersenc470f442003-07-28 09:56:35 +000010382 checkkwd = CHKNL | CHKKWD | CHKALIAS;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010383 lp->n = parse_command();
Eric Andersencb57d552001-06-28 07:25:16 +000010384 prev->next = lp;
10385 } while (readtoken() == TPIPE);
10386 lp->next = NULL;
10387 n1 = pipenode;
10388 }
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010389 tokpushback = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010390 if (negate) {
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010391 n2 = stzalloc(sizeof(struct nnot));
Eric Andersencb57d552001-06-28 07:25:16 +000010392 n2->type = NNOT;
10393 n2->nnot.com = n1;
10394 return n2;
Denis Vlasenko2da584f2007-02-19 22:44:05 +000010395 }
10396 return n1;
Eric Andersencb57d552001-06-28 07:25:16 +000010397}
10398
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010399static union node *
10400makename(void)
10401{
10402 union node *n;
10403
Denis Vlasenko597906c2008-02-20 16:38:54 +000010404 n = stzalloc(sizeof(struct narg));
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010405 n->type = NARG;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010406 /*n->narg.next = NULL; - stzalloc did it */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010407 n->narg.text = wordtext;
10408 n->narg.backquote = backquotelist;
10409 return n;
10410}
10411
10412static void
10413fixredir(union node *n, const char *text, int err)
10414{
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000010415 int fd;
10416
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010417 TRACE(("Fix redir %s %d\n", text, err));
10418 if (!err)
10419 n->ndup.vname = NULL;
10420
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000010421 fd = bb_strtou(text, NULL, 10);
10422 if (!errno && fd >= 0)
10423 n->ndup.dupfd = fd;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010424 else if (LONE_DASH(text))
10425 n->ndup.dupfd = -1;
10426 else {
10427 if (err)
Denis Vlasenko559691a2008-10-05 18:39:31 +000010428 raise_error_syntax("bad fd number");
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010429 n->ndup.vname = makename();
10430 }
10431}
10432
10433/*
10434 * Returns true if the text contains nothing to expand (no dollar signs
10435 * or backquotes).
10436 */
10437static int
Denis Vlasenko68819d12008-12-15 11:26:36 +000010438noexpand(const char *text)
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010439{
Denis Vlasenko68819d12008-12-15 11:26:36 +000010440 const char *p;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010441 char c;
10442
10443 p = text;
10444 while ((c = *p++) != '\0') {
10445 if (c == CTLQUOTEMARK)
10446 continue;
10447 if (c == CTLESC)
10448 p++;
Denis Vlasenko68819d12008-12-15 11:26:36 +000010449 else if (SIT((signed char)c, BASESYNTAX) == CCTL)
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010450 return 0;
10451 }
10452 return 1;
10453}
10454
10455static void
10456parsefname(void)
10457{
10458 union node *n = redirnode;
10459
10460 if (readtoken() != TWORD)
10461 raise_error_unexpected_syntax(-1);
10462 if (n->type == NHERE) {
10463 struct heredoc *here = heredoc;
10464 struct heredoc *p;
10465 int i;
10466
10467 if (quoteflag == 0)
10468 n->type = NXHERE;
10469 TRACE(("Here document %d\n", n->type));
10470 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
Denis Vlasenko559691a2008-10-05 18:39:31 +000010471 raise_error_syntax("illegal eof marker for << redirection");
Denys Vlasenkob6c84342009-08-29 20:23:20 +020010472 rmescapes(wordtext, 0);
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010473 here->eofmark = wordtext;
10474 here->next = NULL;
10475 if (heredoclist == NULL)
10476 heredoclist = here;
10477 else {
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010478 for (p = heredoclist; p->next; p = p->next)
10479 continue;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010480 p->next = here;
10481 }
10482 } else if (n->type == NTOFD || n->type == NFROMFD) {
10483 fixredir(n, wordtext, 0);
10484 } else {
10485 n->nfile.fname = makename();
10486 }
10487}
Eric Andersencb57d552001-06-28 07:25:16 +000010488
Eric Andersenc470f442003-07-28 09:56:35 +000010489static union node *
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010490simplecmd(void)
10491{
10492 union node *args, **app;
10493 union node *n = NULL;
10494 union node *vars, **vpp;
10495 union node **rpp, *redir;
10496 int savecheckkwd;
Denis Vlasenko80591b02008-03-25 07:49:43 +000010497#if ENABLE_ASH_BASH_COMPAT
10498 smallint double_brackets_flag = 0;
10499#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010500
10501 args = NULL;
10502 app = &args;
10503 vars = NULL;
10504 vpp = &vars;
10505 redir = NULL;
10506 rpp = &redir;
10507
10508 savecheckkwd = CHKALIAS;
10509 for (;;) {
Denis Vlasenko80591b02008-03-25 07:49:43 +000010510 int t;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010511 checkkwd = savecheckkwd;
Denis Vlasenko80591b02008-03-25 07:49:43 +000010512 t = readtoken();
10513 switch (t) {
10514#if ENABLE_ASH_BASH_COMPAT
10515 case TAND: /* "&&" */
10516 case TOR: /* "||" */
10517 if (!double_brackets_flag) {
10518 tokpushback = 1;
10519 goto out;
10520 }
10521 wordtext = (char *) (t == TAND ? "-a" : "-o");
10522#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010523 case TWORD:
Denis Vlasenko597906c2008-02-20 16:38:54 +000010524 n = stzalloc(sizeof(struct narg));
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010525 n->type = NARG;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010526 /*n->narg.next = NULL; - stzalloc did it */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010527 n->narg.text = wordtext;
Denis Vlasenko80591b02008-03-25 07:49:43 +000010528#if ENABLE_ASH_BASH_COMPAT
10529 if (strcmp("[[", wordtext) == 0)
10530 double_brackets_flag = 1;
10531 else if (strcmp("]]", wordtext) == 0)
10532 double_brackets_flag = 0;
10533#endif
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010534 n->narg.backquote = backquotelist;
10535 if (savecheckkwd && isassignment(wordtext)) {
10536 *vpp = n;
10537 vpp = &n->narg.next;
10538 } else {
10539 *app = n;
10540 app = &n->narg.next;
10541 savecheckkwd = 0;
10542 }
10543 break;
10544 case TREDIR:
10545 *rpp = n = redirnode;
10546 rpp = &n->nfile.next;
10547 parsefname(); /* read name of redirection file */
10548 break;
10549 case TLP:
10550 if (args && app == &args->narg.next
10551 && !vars && !redir
10552 ) {
10553 struct builtincmd *bcmd;
10554 const char *name;
10555
10556 /* We have a function */
10557 if (readtoken() != TRP)
10558 raise_error_unexpected_syntax(TRP);
10559 name = n->narg.text;
10560 if (!goodname(name)
10561 || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd))
10562 ) {
Denis Vlasenko559691a2008-10-05 18:39:31 +000010563 raise_error_syntax("bad function name");
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010564 }
10565 n->type = NDEFUN;
10566 checkkwd = CHKNL | CHKKWD | CHKALIAS;
10567 n->narg.next = parse_command();
10568 return n;
10569 }
10570 /* fall through */
10571 default:
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010572 tokpushback = 1;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010573 goto out;
10574 }
10575 }
10576 out:
10577 *app = NULL;
10578 *vpp = NULL;
10579 *rpp = NULL;
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010580 n = stzalloc(sizeof(struct ncmd));
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010581 n->type = NCMD;
10582 n->ncmd.args = args;
10583 n->ncmd.assign = vars;
10584 n->ncmd.redirect = redir;
10585 return n;
10586}
10587
10588static union node *
10589parse_command(void)
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000010590{
Eric Andersencb57d552001-06-28 07:25:16 +000010591 union node *n1, *n2;
10592 union node *ap, **app;
10593 union node *cp, **cpp;
10594 union node *redir, **rpp;
Eric Andersenc470f442003-07-28 09:56:35 +000010595 union node **rpp2;
Eric Andersencb57d552001-06-28 07:25:16 +000010596 int t;
10597
10598 redir = NULL;
Eric Andersenc470f442003-07-28 09:56:35 +000010599 rpp2 = &redir;
Eric Andersen88cec252001-09-06 17:35:20 +000010600
Eric Andersencb57d552001-06-28 07:25:16 +000010601 switch (readtoken()) {
Eric Andersenc470f442003-07-28 09:56:35 +000010602 default:
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010603 raise_error_unexpected_syntax(-1);
Eric Andersenc470f442003-07-28 09:56:35 +000010604 /* NOTREACHED */
Eric Andersencb57d552001-06-28 07:25:16 +000010605 case TIF:
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010606 n1 = stzalloc(sizeof(struct nif));
Eric Andersencb57d552001-06-28 07:25:16 +000010607 n1->type = NIF;
10608 n1->nif.test = list(0);
10609 if (readtoken() != TTHEN)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010610 raise_error_unexpected_syntax(TTHEN);
Eric Andersencb57d552001-06-28 07:25:16 +000010611 n1->nif.ifpart = list(0);
10612 n2 = n1;
10613 while (readtoken() == TELIF) {
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010614 n2->nif.elsepart = stzalloc(sizeof(struct nif));
Eric Andersencb57d552001-06-28 07:25:16 +000010615 n2 = n2->nif.elsepart;
10616 n2->type = NIF;
10617 n2->nif.test = list(0);
10618 if (readtoken() != TTHEN)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010619 raise_error_unexpected_syntax(TTHEN);
Eric Andersencb57d552001-06-28 07:25:16 +000010620 n2->nif.ifpart = list(0);
10621 }
10622 if (lasttoken == TELSE)
10623 n2->nif.elsepart = list(0);
10624 else {
10625 n2->nif.elsepart = NULL;
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010626 tokpushback = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010627 }
Eric Andersenc470f442003-07-28 09:56:35 +000010628 t = TFI;
Eric Andersencb57d552001-06-28 07:25:16 +000010629 break;
10630 case TWHILE:
Eric Andersenc470f442003-07-28 09:56:35 +000010631 case TUNTIL: {
Eric Andersencb57d552001-06-28 07:25:16 +000010632 int got;
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010633 n1 = stzalloc(sizeof(struct nbinary));
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010634 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
Eric Andersencb57d552001-06-28 07:25:16 +000010635 n1->nbinary.ch1 = list(0);
Denis Vlasenkoaa744452007-02-23 01:04:22 +000010636 got = readtoken();
10637 if (got != TDO) {
Denis Vlasenko131ae172007-02-18 13:00:19 +000010638 TRACE(("expecting DO got %s %s\n", tokname(got),
10639 got == TWORD ? wordtext : ""));
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010640 raise_error_unexpected_syntax(TDO);
Eric Andersencb57d552001-06-28 07:25:16 +000010641 }
10642 n1->nbinary.ch2 = list(0);
Eric Andersenc470f442003-07-28 09:56:35 +000010643 t = TDONE;
Eric Andersencb57d552001-06-28 07:25:16 +000010644 break;
10645 }
10646 case TFOR:
Denis Vlasenko2dc240c2008-07-24 06:07:50 +000010647 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
Denis Vlasenko559691a2008-10-05 18:39:31 +000010648 raise_error_syntax("bad for loop variable");
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010649 n1 = stzalloc(sizeof(struct nfor));
Eric Andersencb57d552001-06-28 07:25:16 +000010650 n1->type = NFOR;
10651 n1->nfor.var = wordtext;
Eric Andersenc470f442003-07-28 09:56:35 +000010652 checkkwd = CHKKWD | CHKALIAS;
Eric Andersencb57d552001-06-28 07:25:16 +000010653 if (readtoken() == TIN) {
10654 app = &ap;
10655 while (readtoken() == TWORD) {
Denis Vlasenko597906c2008-02-20 16:38:54 +000010656 n2 = stzalloc(sizeof(struct narg));
Eric Andersencb57d552001-06-28 07:25:16 +000010657 n2->type = NARG;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010658 /*n2->narg.next = NULL; - stzalloc did it */
Eric Andersencb57d552001-06-28 07:25:16 +000010659 n2->narg.text = wordtext;
10660 n2->narg.backquote = backquotelist;
10661 *app = n2;
10662 app = &n2->narg.next;
10663 }
10664 *app = NULL;
10665 n1->nfor.args = ap;
10666 if (lasttoken != TNL && lasttoken != TSEMI)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010667 raise_error_unexpected_syntax(-1);
Eric Andersencb57d552001-06-28 07:25:16 +000010668 } else {
Denis Vlasenko597906c2008-02-20 16:38:54 +000010669 n2 = stzalloc(sizeof(struct narg));
Eric Andersencb57d552001-06-28 07:25:16 +000010670 n2->type = NARG;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010671 /*n2->narg.next = NULL; - stzalloc did it */
Eric Andersenc470f442003-07-28 09:56:35 +000010672 n2->narg.text = (char *)dolatstr;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010673 /*n2->narg.backquote = NULL;*/
Eric Andersencb57d552001-06-28 07:25:16 +000010674 n1->nfor.args = n2;
10675 /*
10676 * Newline or semicolon here is optional (but note
10677 * that the original Bourne shell only allowed NL).
10678 */
10679 if (lasttoken != TNL && lasttoken != TSEMI)
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010680 tokpushback = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010681 }
Eric Andersenc470f442003-07-28 09:56:35 +000010682 checkkwd = CHKNL | CHKKWD | CHKALIAS;
Eric Andersencb57d552001-06-28 07:25:16 +000010683 if (readtoken() != TDO)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010684 raise_error_unexpected_syntax(TDO);
Eric Andersencb57d552001-06-28 07:25:16 +000010685 n1->nfor.body = list(0);
Eric Andersenc470f442003-07-28 09:56:35 +000010686 t = TDONE;
Eric Andersencb57d552001-06-28 07:25:16 +000010687 break;
10688 case TCASE:
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010689 n1 = stzalloc(sizeof(struct ncase));
Eric Andersencb57d552001-06-28 07:25:16 +000010690 n1->type = NCASE;
10691 if (readtoken() != TWORD)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010692 raise_error_unexpected_syntax(TWORD);
Denis Vlasenko597906c2008-02-20 16:38:54 +000010693 n1->ncase.expr = n2 = stzalloc(sizeof(struct narg));
Eric Andersencb57d552001-06-28 07:25:16 +000010694 n2->type = NARG;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010695 /*n2->narg.next = NULL; - stzalloc did it */
Eric Andersencb57d552001-06-28 07:25:16 +000010696 n2->narg.text = wordtext;
10697 n2->narg.backquote = backquotelist;
Eric Andersencb57d552001-06-28 07:25:16 +000010698 do {
Eric Andersenc470f442003-07-28 09:56:35 +000010699 checkkwd = CHKKWD | CHKALIAS;
Eric Andersencb57d552001-06-28 07:25:16 +000010700 } while (readtoken() == TNL);
10701 if (lasttoken != TIN)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010702 raise_error_unexpected_syntax(TIN);
Eric Andersencb57d552001-06-28 07:25:16 +000010703 cpp = &n1->ncase.cases;
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010704 next_case:
Eric Andersenc470f442003-07-28 09:56:35 +000010705 checkkwd = CHKNL | CHKKWD;
10706 t = readtoken();
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000010707 while (t != TESAC) {
Eric Andersencb57d552001-06-28 07:25:16 +000010708 if (lasttoken == TLP)
10709 readtoken();
Denis Vlasenko838ffd52008-02-21 04:32:08 +000010710 *cpp = cp = stzalloc(sizeof(struct nclist));
Eric Andersencb57d552001-06-28 07:25:16 +000010711 cp->type = NCLIST;
10712 app = &cp->nclist.pattern;
10713 for (;;) {
Denis Vlasenko597906c2008-02-20 16:38:54 +000010714 *app = ap = stzalloc(sizeof(struct narg));
Eric Andersencb57d552001-06-28 07:25:16 +000010715 ap->type = NARG;
Denis Vlasenko597906c2008-02-20 16:38:54 +000010716 /*ap->narg.next = NULL; - stzalloc did it */
Eric Andersencb57d552001-06-28 07:25:16 +000010717 ap->narg.text = wordtext;
10718 ap->narg.backquote = backquotelist;
Eric Andersenc470f442003-07-28 09:56:35 +000010719 if (readtoken() != TPIPE)
Eric Andersencb57d552001-06-28 07:25:16 +000010720 break;
10721 app = &ap->narg.next;
10722 readtoken();
10723 }
Denis Vlasenko597906c2008-02-20 16:38:54 +000010724 //ap->narg.next = NULL;
Eric Andersencb57d552001-06-28 07:25:16 +000010725 if (lasttoken != TRP)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010726 raise_error_unexpected_syntax(TRP);
Eric Andersenc470f442003-07-28 09:56:35 +000010727 cp->nclist.body = list(2);
Eric Andersencb57d552001-06-28 07:25:16 +000010728
Eric Andersenc470f442003-07-28 09:56:35 +000010729 cpp = &cp->nclist.next;
10730
10731 checkkwd = CHKNL | CHKKWD;
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010732 t = readtoken();
10733 if (t != TESAC) {
Eric Andersencb57d552001-06-28 07:25:16 +000010734 if (t != TENDCASE)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010735 raise_error_unexpected_syntax(TENDCASE);
10736 goto next_case;
Eric Andersencb57d552001-06-28 07:25:16 +000010737 }
Eric Andersenc470f442003-07-28 09:56:35 +000010738 }
Eric Andersencb57d552001-06-28 07:25:16 +000010739 *cpp = NULL;
Eric Andersenc470f442003-07-28 09:56:35 +000010740 goto redir;
Eric Andersencb57d552001-06-28 07:25:16 +000010741 case TLP:
Denis Vlasenko597906c2008-02-20 16:38:54 +000010742 n1 = stzalloc(sizeof(struct nredir));
Eric Andersencb57d552001-06-28 07:25:16 +000010743 n1->type = NSUBSHELL;
10744 n1->nredir.n = list(0);
Denis Vlasenko597906c2008-02-20 16:38:54 +000010745 /*n1->nredir.redirect = NULL; - stzalloc did it */
Eric Andersenc470f442003-07-28 09:56:35 +000010746 t = TRP;
Eric Andersencb57d552001-06-28 07:25:16 +000010747 break;
10748 case TBEGIN:
10749 n1 = list(0);
Eric Andersenc470f442003-07-28 09:56:35 +000010750 t = TEND;
Eric Andersencb57d552001-06-28 07:25:16 +000010751 break;
Eric Andersencb57d552001-06-28 07:25:16 +000010752 case TWORD:
Eric Andersenc470f442003-07-28 09:56:35 +000010753 case TREDIR:
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010754 tokpushback = 1;
Eric Andersenc470f442003-07-28 09:56:35 +000010755 return simplecmd();
Eric Andersencb57d552001-06-28 07:25:16 +000010756 }
10757
Eric Andersenc470f442003-07-28 09:56:35 +000010758 if (readtoken() != t)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000010759 raise_error_unexpected_syntax(t);
Eric Andersenc470f442003-07-28 09:56:35 +000010760
Denis Vlasenko5cedb752007-02-18 19:56:41 +000010761 redir:
Eric Andersencb57d552001-06-28 07:25:16 +000010762 /* Now check for redirection which may follow command */
Eric Andersenc470f442003-07-28 09:56:35 +000010763 checkkwd = CHKKWD | CHKALIAS;
10764 rpp = rpp2;
Eric Andersencb57d552001-06-28 07:25:16 +000010765 while (readtoken() == TREDIR) {
10766 *rpp = n2 = redirnode;
10767 rpp = &n2->nfile.next;
10768 parsefname();
10769 }
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010770 tokpushback = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010771 *rpp = NULL;
10772 if (redir) {
10773 if (n1->type != NSUBSHELL) {
Denis Vlasenko597906c2008-02-20 16:38:54 +000010774 n2 = stzalloc(sizeof(struct nredir));
Eric Andersencb57d552001-06-28 07:25:16 +000010775 n2->type = NREDIR;
10776 n2->nredir.n = n1;
10777 n1 = n2;
10778 }
10779 n1->nredir.redirect = redir;
10780 }
Eric Andersencb57d552001-06-28 07:25:16 +000010781 return n1;
10782}
10783
Denis Vlasenkoef527f52008-06-23 01:52:30 +000010784#if ENABLE_ASH_BASH_COMPAT
10785static int decode_dollar_squote(void)
10786{
10787 static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567";
10788 int c, cnt;
10789 char *p;
10790 char buf[4];
10791
10792 c = pgetc();
10793 p = strchr(C_escapes, c);
10794 if (p) {
10795 buf[0] = c;
10796 p = buf;
10797 cnt = 3;
10798 if ((unsigned char)(c - '0') <= 7) { /* \ooo */
10799 do {
10800 c = pgetc();
10801 *++p = c;
10802 } while ((unsigned char)(c - '0') <= 7 && --cnt);
10803 pungetc();
10804 } else if (c == 'x') { /* \xHH */
10805 do {
10806 c = pgetc();
10807 *++p = c;
10808 } while (isxdigit(c) && --cnt);
10809 pungetc();
10810 if (cnt == 3) { /* \x but next char is "bad" */
10811 c = 'x';
10812 goto unrecognized;
10813 }
10814 } else { /* simple seq like \\ or \t */
10815 p++;
10816 }
10817 *p = '\0';
10818 p = buf;
10819 c = bb_process_escape_sequence((void*)&p);
10820 } else { /* unrecognized "\z": print both chars unless ' or " */
10821 if (c != '\'' && c != '"') {
10822 unrecognized:
10823 c |= 0x100; /* "please encode \, then me" */
10824 }
10825 }
10826 return c;
10827}
10828#endif
10829
Eric Andersencb57d552001-06-28 07:25:16 +000010830/*
10831 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10832 * is not NULL, read a here document. In the latter case, eofmark is the
10833 * word which marks the end of the document and striptabs is true if
10834 * leading tabs should be stripped from the document. The argument firstc
10835 * is the first character of the input token or document.
10836 *
10837 * Because C does not have internal subroutines, I have simulated them
10838 * using goto's to implement the subroutine linkage. The following macros
10839 * will run code that appears at the end of readtoken1.
10840 */
Eric Andersen2870d962001-07-02 17:27:21 +000010841#define CHECKEND() {goto checkend; checkend_return:;}
10842#define PARSEREDIR() {goto parseredir; parseredir_return:;}
10843#define PARSESUB() {goto parsesub; parsesub_return:;}
10844#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10845#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10846#define PARSEARITH() {goto parsearith; parsearith_return:;}
Eric Andersencb57d552001-06-28 07:25:16 +000010847static int
Eric Andersenc470f442003-07-28 09:56:35 +000010848readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
Manuel Novoa III 16815d42001-08-10 19:36:07 +000010849{
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010850 /* NB: syntax parameter fits into smallint */
Eric Andersencb57d552001-06-28 07:25:16 +000010851 int c = firstc;
10852 char *out;
10853 int len;
10854 char line[EOFMARKLEN + 1];
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010855 struct nodelist *bqlist;
10856 smallint quotef;
10857 smallint dblquote;
10858 smallint oldstyle;
10859 smallint prevsyntax; /* syntax before arithmetic */
Denis Vlasenko46a53062007-09-24 18:30:02 +000010860#if ENABLE_ASH_EXPAND_PRMT
10861 smallint pssyntax; /* we are expanding a prompt string */
10862#endif
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010863 int varnest; /* levels of variables expansion */
10864 int arinest; /* levels of arithmetic expansion */
10865 int parenlevel; /* levels of parens in arithmetic */
10866 int dqvarnest; /* levels of variables expansion within double quotes */
10867
Denis Vlasenko5e34ff22009-04-21 11:09:40 +000010868 IF_ASH_BASH_COMPAT(smallint bash_dollar_squote = 0;)
Denis Vlasenkoef527f52008-06-23 01:52:30 +000010869
Eric Andersencb57d552001-06-28 07:25:16 +000010870#if __GNUC__
10871 /* Avoid longjmp clobbering */
10872 (void) &out;
10873 (void) &quotef;
10874 (void) &dblquote;
10875 (void) &varnest;
10876 (void) &arinest;
10877 (void) &parenlevel;
10878 (void) &dqvarnest;
10879 (void) &oldstyle;
10880 (void) &prevsyntax;
10881 (void) &syntax;
10882#endif
Denis Vlasenko41eb3002008-11-28 03:42:31 +000010883 startlinno = g_parsefile->linno;
Eric Andersencb57d552001-06-28 07:25:16 +000010884 bqlist = NULL;
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010885 quotef = 0;
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010886 oldstyle = 0;
10887 prevsyntax = 0;
Denis Vlasenko46a53062007-09-24 18:30:02 +000010888#if ENABLE_ASH_EXPAND_PRMT
10889 pssyntax = (syntax == PSSYNTAX);
10890 if (pssyntax)
10891 syntax = DQSYNTAX;
10892#endif
10893 dblquote = (syntax == DQSYNTAX);
Eric Andersencb57d552001-06-28 07:25:16 +000010894 varnest = 0;
10895 arinest = 0;
10896 parenlevel = 0;
10897 dqvarnest = 0;
10898
10899 STARTSTACKSTR(out);
Denis Vlasenko176d49d2008-10-06 09:51:47 +000010900 loop:
10901 /* For each line, until end of word */
10902 {
Eric Andersenc470f442003-07-28 09:56:35 +000010903 CHECKEND(); /* set c to PEOF if at end of here document */
10904 for (;;) { /* until end of line or end of word */
10905 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
Denis Vlasenkobf0a2012006-12-26 10:42:51 +000010906 switch (SIT(c, syntax)) {
Eric Andersenc470f442003-07-28 09:56:35 +000010907 case CNL: /* '\n' */
Eric Andersencb57d552001-06-28 07:25:16 +000010908 if (syntax == BASESYNTAX)
Eric Andersenc470f442003-07-28 09:56:35 +000010909 goto endword; /* exit outer loop */
Eric Andersencb57d552001-06-28 07:25:16 +000010910 USTPUTC(c, out);
Denis Vlasenko41eb3002008-11-28 03:42:31 +000010911 g_parsefile->linno++;
Eric Andersencb57d552001-06-28 07:25:16 +000010912 if (doprompt)
10913 setprompt(2);
Eric Andersencb57d552001-06-28 07:25:16 +000010914 c = pgetc();
Eric Andersenc470f442003-07-28 09:56:35 +000010915 goto loop; /* continue outer loop */
Eric Andersencb57d552001-06-28 07:25:16 +000010916 case CWORD:
10917 USTPUTC(c, out);
10918 break;
10919 case CCTL:
Eric Andersenc470f442003-07-28 09:56:35 +000010920 if (eofmark == NULL || dblquote)
Eric Andersencb57d552001-06-28 07:25:16 +000010921 USTPUTC(CTLESC, out);
Denis Vlasenkoef527f52008-06-23 01:52:30 +000010922#if ENABLE_ASH_BASH_COMPAT
10923 if (c == '\\' && bash_dollar_squote) {
10924 c = decode_dollar_squote();
10925 if (c & 0x100) {
10926 USTPUTC('\\', out);
10927 c = (unsigned char)c;
10928 }
10929 }
10930#endif
Eric Andersencb57d552001-06-28 07:25:16 +000010931 USTPUTC(c, out);
10932 break;
Eric Andersenc470f442003-07-28 09:56:35 +000010933 case CBACK: /* backslash */
Eric Andersencb57d552001-06-28 07:25:16 +000010934 c = pgetc2();
10935 if (c == PEOF) {
Eric Andersenc470f442003-07-28 09:56:35 +000010936 USTPUTC(CTLESC, out);
Eric Andersencb57d552001-06-28 07:25:16 +000010937 USTPUTC('\\', out);
10938 pungetc();
10939 } else if (c == '\n') {
10940 if (doprompt)
10941 setprompt(2);
Eric Andersencb57d552001-06-28 07:25:16 +000010942 } else {
Denis Vlasenko46a53062007-09-24 18:30:02 +000010943#if ENABLE_ASH_EXPAND_PRMT
10944 if (c == '$' && pssyntax) {
10945 USTPUTC(CTLESC, out);
10946 USTPUTC('\\', out);
10947 }
10948#endif
Denis Vlasenkoef527f52008-06-23 01:52:30 +000010949 if (dblquote && c != '\\'
10950 && c != '`' && c != '$'
10951 && (c != '"' || eofmark != NULL)
Eric Andersenc470f442003-07-28 09:56:35 +000010952 ) {
10953 USTPUTC(CTLESC, out);
Eric Andersencb57d552001-06-28 07:25:16 +000010954 USTPUTC('\\', out);
Eric Andersenc470f442003-07-28 09:56:35 +000010955 }
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000010956 if (SIT(c, SQSYNTAX) == CCTL)
Eric Andersencb57d552001-06-28 07:25:16 +000010957 USTPUTC(CTLESC, out);
Eric Andersencb57d552001-06-28 07:25:16 +000010958 USTPUTC(c, out);
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010959 quotef = 1;
Eric Andersencb57d552001-06-28 07:25:16 +000010960 }
10961 break;
10962 case CSQUOTE:
Eric Andersencb57d552001-06-28 07:25:16 +000010963 syntax = SQSYNTAX;
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000010964 quotemark:
Eric Andersenc470f442003-07-28 09:56:35 +000010965 if (eofmark == NULL) {
10966 USTPUTC(CTLQUOTEMARK, out);
10967 }
Eric Andersencb57d552001-06-28 07:25:16 +000010968 break;
10969 case CDQUOTE:
Eric Andersencb57d552001-06-28 07:25:16 +000010970 syntax = DQSYNTAX;
10971 dblquote = 1;
Eric Andersenc470f442003-07-28 09:56:35 +000010972 goto quotemark;
Eric Andersencb57d552001-06-28 07:25:16 +000010973 case CENDQUOTE:
Denis Vlasenko5e34ff22009-04-21 11:09:40 +000010974 IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000010975 if (eofmark != NULL && arinest == 0
10976 && varnest == 0
10977 ) {
Eric Andersencb57d552001-06-28 07:25:16 +000010978 USTPUTC(c, out);
10979 } else {
Eric Andersenc470f442003-07-28 09:56:35 +000010980 if (dqvarnest == 0) {
Eric Andersencb57d552001-06-28 07:25:16 +000010981 syntax = BASESYNTAX;
10982 dblquote = 0;
10983 }
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000010984 quotef = 1;
Eric Andersenc470f442003-07-28 09:56:35 +000010985 goto quotemark;
Eric Andersencb57d552001-06-28 07:25:16 +000010986 }
10987 break;
Eric Andersenc470f442003-07-28 09:56:35 +000010988 case CVAR: /* '$' */
10989 PARSESUB(); /* parse substitution */
Eric Andersencb57d552001-06-28 07:25:16 +000010990 break;
Eric Andersenc470f442003-07-28 09:56:35 +000010991 case CENDVAR: /* '}' */
Eric Andersencb57d552001-06-28 07:25:16 +000010992 if (varnest > 0) {
10993 varnest--;
10994 if (dqvarnest > 0) {
10995 dqvarnest--;
10996 }
10997 USTPUTC(CTLENDVAR, out);
10998 } else {
10999 USTPUTC(c, out);
11000 }
11001 break;
Mike Frysinger98c52642009-04-02 10:02:37 +000011002#if ENABLE_SH_MATH_SUPPORT
Eric Andersenc470f442003-07-28 09:56:35 +000011003 case CLP: /* '(' in arithmetic */
Eric Andersencb57d552001-06-28 07:25:16 +000011004 parenlevel++;
11005 USTPUTC(c, out);
11006 break;
Eric Andersenc470f442003-07-28 09:56:35 +000011007 case CRP: /* ')' in arithmetic */
Eric Andersencb57d552001-06-28 07:25:16 +000011008 if (parenlevel > 0) {
11009 USTPUTC(c, out);
11010 --parenlevel;
11011 } else {
11012 if (pgetc() == ')') {
11013 if (--arinest == 0) {
11014 USTPUTC(CTLENDARI, out);
11015 syntax = prevsyntax;
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000011016 dblquote = (syntax == DQSYNTAX);
Eric Andersencb57d552001-06-28 07:25:16 +000011017 } else
11018 USTPUTC(')', out);
11019 } else {
11020 /*
11021 * unbalanced parens
11022 * (don't 2nd guess - no error)
11023 */
11024 pungetc();
11025 USTPUTC(')', out);
11026 }
11027 }
11028 break;
11029#endif
Eric Andersenc470f442003-07-28 09:56:35 +000011030 case CBQUOTE: /* '`' */
Eric Andersencb57d552001-06-28 07:25:16 +000011031 PARSEBACKQOLD();
11032 break;
Eric Andersen2870d962001-07-02 17:27:21 +000011033 case CENDFILE:
Eric Andersenc470f442003-07-28 09:56:35 +000011034 goto endword; /* exit outer loop */
Eric Andersencb57d552001-06-28 07:25:16 +000011035 case CIGN:
11036 break;
11037 default:
Denis Vlasenko834dee72008-10-07 09:18:30 +000011038 if (varnest == 0) {
11039#if ENABLE_ASH_BASH_COMPAT
11040 if (c == '&') {
11041 if (pgetc() == '>')
11042 c = 0x100 + '>'; /* flag &> */
11043 pungetc();
11044 }
11045#endif
Eric Andersenc470f442003-07-28 09:56:35 +000011046 goto endword; /* exit outer loop */
Denis Vlasenko834dee72008-10-07 09:18:30 +000011047 }
Denis Vlasenko131ae172007-02-18 13:00:19 +000011048#if ENABLE_ASH_ALIAS
Eric Andersen3102ac42001-07-06 04:26:23 +000011049 if (c != PEOA)
11050#endif
Eric Andersencb57d552001-06-28 07:25:16 +000011051 USTPUTC(c, out);
Eric Andersen3102ac42001-07-06 04:26:23 +000011052
Eric Andersencb57d552001-06-28 07:25:16 +000011053 }
Denis Vlasenko834dee72008-10-07 09:18:30 +000011054 c = pgetc_fast();
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000011055 } /* for (;;) */
Eric Andersencb57d552001-06-28 07:25:16 +000011056 }
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000011057 endword:
Mike Frysinger98c52642009-04-02 10:02:37 +000011058#if ENABLE_SH_MATH_SUPPORT
Eric Andersencb57d552001-06-28 07:25:16 +000011059 if (syntax == ARISYNTAX)
Denis Vlasenko559691a2008-10-05 18:39:31 +000011060 raise_error_syntax("missing '))'");
Eric Andersenc470f442003-07-28 09:56:35 +000011061#endif
Denis Vlasenko99eb8502007-02-23 21:09:49 +000011062 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
Denis Vlasenko559691a2008-10-05 18:39:31 +000011063 raise_error_syntax("unterminated quoted string");
Eric Andersencb57d552001-06-28 07:25:16 +000011064 if (varnest != 0) {
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011065 startlinno = g_parsefile->linno;
Eric Andersenc470f442003-07-28 09:56:35 +000011066 /* { */
Denis Vlasenko559691a2008-10-05 18:39:31 +000011067 raise_error_syntax("missing '}'");
Eric Andersencb57d552001-06-28 07:25:16 +000011068 }
11069 USTPUTC('\0', out);
Eric Andersenc470f442003-07-28 09:56:35 +000011070 len = out - (char *)stackblock();
Eric Andersencb57d552001-06-28 07:25:16 +000011071 out = stackblock();
11072 if (eofmark == NULL) {
Denis Vlasenko5e34ff22009-04-21 11:09:40 +000011073 if ((c == '>' || c == '<' IF_ASH_BASH_COMPAT( || c == 0x100 + '>'))
Denis Vlasenko834dee72008-10-07 09:18:30 +000011074 && quotef == 0
11075 ) {
Denis Vlasenko559691a2008-10-05 18:39:31 +000011076 if (isdigit_str9(out)) {
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000011077 PARSEREDIR(); /* passed as params: out, c */
11078 lasttoken = TREDIR;
11079 return lasttoken;
11080 }
11081 /* else: non-number X seen, interpret it
11082 * as "NNNX>file" = "NNNX >file" */
Eric Andersencb57d552001-06-28 07:25:16 +000011083 }
Denis Vlasenkoef527f52008-06-23 01:52:30 +000011084 pungetc();
Eric Andersencb57d552001-06-28 07:25:16 +000011085 }
11086 quoteflag = quotef;
11087 backquotelist = bqlist;
11088 grabstackblock(len);
11089 wordtext = out;
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000011090 lasttoken = TWORD;
11091 return lasttoken;
Eric Andersencb57d552001-06-28 07:25:16 +000011092/* end of readtoken routine */
11093
Eric Andersencb57d552001-06-28 07:25:16 +000011094/*
11095 * Check to see whether we are at the end of the here document. When this
11096 * is called, c is set to the first character of the next input line. If
11097 * we are at the end of the here document, this routine sets the c to PEOF.
11098 */
Eric Andersenc470f442003-07-28 09:56:35 +000011099checkend: {
11100 if (eofmark) {
Denis Vlasenko131ae172007-02-18 13:00:19 +000011101#if ENABLE_ASH_ALIAS
Eric Andersenc470f442003-07-28 09:56:35 +000011102 if (c == PEOA) {
11103 c = pgetc2();
11104 }
11105#endif
11106 if (striptabs) {
11107 while (c == '\t') {
Eric Andersencb57d552001-06-28 07:25:16 +000011108 c = pgetc2();
11109 }
Eric Andersenc470f442003-07-28 09:56:35 +000011110 }
11111 if (c == *eofmark) {
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000011112 if (pfgets(line, sizeof(line)) != NULL) {
Eric Andersenc470f442003-07-28 09:56:35 +000011113 char *p, *q;
Eric Andersencb57d552001-06-28 07:25:16 +000011114
Eric Andersenc470f442003-07-28 09:56:35 +000011115 p = line;
Denis Vlasenkof7d56652008-03-25 05:51:41 +000011116 for (q = eofmark + 1; *q && *p == *q; p++, q++)
11117 continue;
Eric Andersenc470f442003-07-28 09:56:35 +000011118 if (*p == '\n' && *q == '\0') {
11119 c = PEOF;
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011120 g_parsefile->linno++;
Eric Andersenc470f442003-07-28 09:56:35 +000011121 needprompt = doprompt;
11122 } else {
11123 pushstring(line, NULL);
Eric Andersencb57d552001-06-28 07:25:16 +000011124 }
11125 }
11126 }
11127 }
Eric Andersenc470f442003-07-28 09:56:35 +000011128 goto checkend_return;
11129}
Eric Andersencb57d552001-06-28 07:25:16 +000011130
Eric Andersencb57d552001-06-28 07:25:16 +000011131/*
11132 * Parse a redirection operator. The variable "out" points to a string
11133 * specifying the fd to be redirected. The variable "c" contains the
11134 * first character of the redirection operator.
11135 */
Eric Andersenc470f442003-07-28 09:56:35 +000011136parseredir: {
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000011137 /* out is already checked to be a valid number or "" */
11138 int fd = (*out == '\0' ? -1 : atoi(out));
Eric Andersenc470f442003-07-28 09:56:35 +000011139 union node *np;
Eric Andersencb57d552001-06-28 07:25:16 +000011140
Denis Vlasenko597906c2008-02-20 16:38:54 +000011141 np = stzalloc(sizeof(struct nfile));
Eric Andersenc470f442003-07-28 09:56:35 +000011142 if (c == '>') {
11143 np->nfile.fd = 1;
11144 c = pgetc();
11145 if (c == '>')
11146 np->type = NAPPEND;
11147 else if (c == '|')
11148 np->type = NCLOBBER;
11149 else if (c == '&')
11150 np->type = NTOFD;
Denis Vlasenko559691a2008-10-05 18:39:31 +000011151 /* it also can be NTO2 (>&file), but we can't figure it out yet */
Eric Andersenc470f442003-07-28 09:56:35 +000011152 else {
11153 np->type = NTO;
11154 pungetc();
Eric Andersencb57d552001-06-28 07:25:16 +000011155 }
Denis Vlasenko834dee72008-10-07 09:18:30 +000011156 }
11157#if ENABLE_ASH_BASH_COMPAT
11158 else if (c == 0x100 + '>') { /* this flags &> redirection */
11159 np->nfile.fd = 1;
11160 pgetc(); /* this is '>', no need to check */
11161 np->type = NTO2;
11162 }
11163#endif
11164 else { /* c == '<' */
Denis Vlasenko597906c2008-02-20 16:38:54 +000011165 /*np->nfile.fd = 0; - stzalloc did it */
Denis Vlasenko5cedb752007-02-18 19:56:41 +000011166 c = pgetc();
11167 switch (c) {
Eric Andersenc470f442003-07-28 09:56:35 +000011168 case '<':
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000011169 if (sizeof(struct nfile) != sizeof(struct nhere)) {
Denis Vlasenko597906c2008-02-20 16:38:54 +000011170 np = stzalloc(sizeof(struct nhere));
11171 /*np->nfile.fd = 0; - stzalloc did it */
Eric Andersenc470f442003-07-28 09:56:35 +000011172 }
11173 np->type = NHERE;
Denis Vlasenko838ffd52008-02-21 04:32:08 +000011174 heredoc = stzalloc(sizeof(struct heredoc));
Eric Andersenc470f442003-07-28 09:56:35 +000011175 heredoc->here = np;
Denis Vlasenko5cedb752007-02-18 19:56:41 +000011176 c = pgetc();
11177 if (c == '-') {
Eric Andersenc470f442003-07-28 09:56:35 +000011178 heredoc->striptabs = 1;
11179 } else {
Denis Vlasenko838ffd52008-02-21 04:32:08 +000011180 /*heredoc->striptabs = 0; - stzalloc did it */
Eric Andersenc470f442003-07-28 09:56:35 +000011181 pungetc();
11182 }
11183 break;
11184
11185 case '&':
11186 np->type = NFROMFD;
11187 break;
11188
11189 case '>':
11190 np->type = NFROMTO;
11191 break;
11192
11193 default:
11194 np->type = NFROM;
11195 pungetc();
11196 break;
11197 }
Eric Andersencb57d552001-06-28 07:25:16 +000011198 }
Denis Vlasenko6fbb43b2008-07-24 19:44:41 +000011199 if (fd >= 0)
11200 np->nfile.fd = fd;
Eric Andersenc470f442003-07-28 09:56:35 +000011201 redirnode = np;
11202 goto parseredir_return;
11203}
Eric Andersencb57d552001-06-28 07:25:16 +000011204
Eric Andersencb57d552001-06-28 07:25:16 +000011205/*
11206 * Parse a substitution. At this point, we have read the dollar sign
11207 * and nothing else.
11208 */
Denis Vlasenkocc571512007-02-23 21:10:35 +000011209
11210/* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
11211 * (assuming ascii char codes, as the original implementation did) */
11212#define is_special(c) \
Denis Vlasenkoef527f52008-06-23 01:52:30 +000011213 (((unsigned)(c) - 33 < 32) \
11214 && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1))
Eric Andersenc470f442003-07-28 09:56:35 +000011215parsesub: {
11216 int subtype;
11217 int typeloc;
11218 int flags;
11219 char *p;
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000011220 static const char types[] ALIGN1 = "}-+?=";
Eric Andersencb57d552001-06-28 07:25:16 +000011221
Eric Andersenc470f442003-07-28 09:56:35 +000011222 c = pgetc();
Denis Vlasenkoef527f52008-06-23 01:52:30 +000011223 if (c <= PEOA_OR_PEOF
11224 || (c != '(' && c != '{' && !is_name(c) && !is_special(c))
Eric Andersenc470f442003-07-28 09:56:35 +000011225 ) {
Denis Vlasenkoef527f52008-06-23 01:52:30 +000011226#if ENABLE_ASH_BASH_COMPAT
11227 if (c == '\'')
11228 bash_dollar_squote = 1;
11229 else
11230#endif
11231 USTPUTC('$', out);
Eric Andersenc470f442003-07-28 09:56:35 +000011232 pungetc();
11233 } else if (c == '(') { /* $(command) or $((arith)) */
11234 if (pgetc() == '(') {
Mike Frysinger98c52642009-04-02 10:02:37 +000011235#if ENABLE_SH_MATH_SUPPORT
Eric Andersenc470f442003-07-28 09:56:35 +000011236 PARSEARITH();
11237#else
Mike Frysinger98a6f562008-06-09 09:38:45 +000011238 raise_error_syntax("you disabled math support for $((arith)) syntax");
Eric Andersenc470f442003-07-28 09:56:35 +000011239#endif
Glenn L McGrath9fef17d2002-08-22 18:41:20 +000011240 } else {
Eric Andersenc470f442003-07-28 09:56:35 +000011241 pungetc();
11242 PARSEBACKQNEW();
11243 }
11244 } else {
11245 USTPUTC(CTLVAR, out);
11246 typeloc = out - (char *)stackblock();
11247 USTPUTC(VSNORMAL, out);
11248 subtype = VSNORMAL;
11249 if (c == '{') {
11250 c = pgetc();
11251 if (c == '#') {
Denis Vlasenko5cedb752007-02-18 19:56:41 +000011252 c = pgetc();
11253 if (c == '}')
Eric Andersenc470f442003-07-28 09:56:35 +000011254 c = '#';
11255 else
11256 subtype = VSLENGTH;
Denis Vlasenko5cedb752007-02-18 19:56:41 +000011257 } else
Eric Andersenc470f442003-07-28 09:56:35 +000011258 subtype = 0;
11259 }
11260 if (c > PEOA_OR_PEOF && is_name(c)) {
11261 do {
11262 STPUTC(c, out);
Eric Andersencb57d552001-06-28 07:25:16 +000011263 c = pgetc();
Eric Andersenc470f442003-07-28 09:56:35 +000011264 } while (c > PEOA_OR_PEOF && is_in_name(c));
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011265 } else if (isdigit(c)) {
Eric Andersenc470f442003-07-28 09:56:35 +000011266 do {
11267 STPUTC(c, out);
11268 c = pgetc();
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011269 } while (isdigit(c));
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000011270 } else if (is_special(c)) {
Eric Andersenc470f442003-07-28 09:56:35 +000011271 USTPUTC(c, out);
11272 c = pgetc();
Denis Vlasenko559691a2008-10-05 18:39:31 +000011273 } else {
11274 badsub:
11275 raise_error_syntax("bad substitution");
11276 }
Eric Andersencb57d552001-06-28 07:25:16 +000011277
Eric Andersenc470f442003-07-28 09:56:35 +000011278 STPUTC('=', out);
11279 flags = 0;
11280 if (subtype == 0) {
11281 switch (c) {
11282 case ':':
Eric Andersenc470f442003-07-28 09:56:35 +000011283 c = pgetc();
Denis Vlasenko92e13c22008-03-25 01:17:40 +000011284#if ENABLE_ASH_BASH_COMPAT
11285 if (c == ':' || c == '$' || isdigit(c)) {
11286 pungetc();
11287 subtype = VSSUBSTR;
11288 break;
11289 }
11290#endif
11291 flags = VSNUL;
Eric Andersenc470f442003-07-28 09:56:35 +000011292 /*FALLTHROUGH*/
11293 default:
11294 p = strchr(types, c);
11295 if (p == NULL)
11296 goto badsub;
11297 subtype = p - types + VSNORMAL;
11298 break;
11299 case '%':
Denis Vlasenko92e13c22008-03-25 01:17:40 +000011300 case '#': {
11301 int cc = c;
11302 subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
11303 c = pgetc();
11304 if (c == cc)
11305 subtype++;
11306 else
11307 pungetc();
11308 break;
11309 }
11310#if ENABLE_ASH_BASH_COMPAT
11311 case '/':
11312 subtype = VSREPLACE;
11313 c = pgetc();
11314 if (c == '/')
11315 subtype++; /* VSREPLACEALL */
11316 else
11317 pungetc();
11318 break;
11319#endif
Eric Andersencb57d552001-06-28 07:25:16 +000011320 }
Eric Andersenc470f442003-07-28 09:56:35 +000011321 } else {
11322 pungetc();
11323 }
11324 if (dblquote || arinest)
11325 flags |= VSQUOTE;
11326 *((char *)stackblock() + typeloc) = subtype | flags;
11327 if (subtype != VSNORMAL) {
11328 varnest++;
11329 if (dblquote || arinest) {
11330 dqvarnest++;
Eric Andersencb57d552001-06-28 07:25:16 +000011331 }
11332 }
11333 }
Eric Andersenc470f442003-07-28 09:56:35 +000011334 goto parsesub_return;
11335}
Eric Andersencb57d552001-06-28 07:25:16 +000011336
Eric Andersencb57d552001-06-28 07:25:16 +000011337/*
11338 * Called to parse command substitutions. Newstyle is set if the command
11339 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
11340 * list of commands (passed by reference), and savelen is the number of
11341 * characters on the top of the stack which must be preserved.
11342 */
Eric Andersenc470f442003-07-28 09:56:35 +000011343parsebackq: {
11344 struct nodelist **nlpp;
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000011345 smallint savepbq;
Eric Andersenc470f442003-07-28 09:56:35 +000011346 union node *n;
11347 char *volatile str;
11348 struct jmploc jmploc;
11349 struct jmploc *volatile savehandler;
11350 size_t savelen;
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000011351 smallint saveprompt = 0;
11352
Eric Andersencb57d552001-06-28 07:25:16 +000011353#ifdef __GNUC__
Eric Andersenc470f442003-07-28 09:56:35 +000011354 (void) &saveprompt;
Eric Andersencb57d552001-06-28 07:25:16 +000011355#endif
Eric Andersenc470f442003-07-28 09:56:35 +000011356 savepbq = parsebackquote;
11357 if (setjmp(jmploc.loc)) {
Denis Vlasenko60818682007-09-28 22:07:23 +000011358 free(str);
Eric Andersenc470f442003-07-28 09:56:35 +000011359 parsebackquote = 0;
Denis Vlasenko2da584f2007-02-19 22:44:05 +000011360 exception_handler = savehandler;
11361 longjmp(exception_handler->loc, 1);
Eric Andersenc470f442003-07-28 09:56:35 +000011362 }
Denis Vlasenkob012b102007-02-19 22:43:01 +000011363 INT_OFF;
Eric Andersenc470f442003-07-28 09:56:35 +000011364 str = NULL;
11365 savelen = out - (char *)stackblock();
11366 if (savelen > 0) {
11367 str = ckmalloc(savelen);
11368 memcpy(str, stackblock(), savelen);
11369 }
Denis Vlasenko2da584f2007-02-19 22:44:05 +000011370 savehandler = exception_handler;
11371 exception_handler = &jmploc;
Denis Vlasenkob012b102007-02-19 22:43:01 +000011372 INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +000011373 if (oldstyle) {
11374 /* We must read until the closing backquote, giving special
11375 treatment to some slashes, and then push the string and
11376 reread it as input, interpreting it normally. */
11377 char *pout;
11378 int pc;
11379 size_t psavelen;
11380 char *pstr;
11381
11382
11383 STARTSTACKSTR(pout);
11384 for (;;) {
11385 if (needprompt) {
11386 setprompt(2);
Eric Andersenc470f442003-07-28 09:56:35 +000011387 }
Denis Vlasenko5cedb752007-02-18 19:56:41 +000011388 pc = pgetc();
11389 switch (pc) {
Eric Andersenc470f442003-07-28 09:56:35 +000011390 case '`':
11391 goto done;
11392
11393 case '\\':
Denis Vlasenko5cedb752007-02-18 19:56:41 +000011394 pc = pgetc();
11395 if (pc == '\n') {
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011396 g_parsefile->linno++;
Eric Andersenc470f442003-07-28 09:56:35 +000011397 if (doprompt)
11398 setprompt(2);
11399 /*
11400 * If eating a newline, avoid putting
11401 * the newline into the new character
11402 * stream (via the STPUTC after the
11403 * switch).
11404 */
11405 continue;
11406 }
11407 if (pc != '\\' && pc != '`' && pc != '$'
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000011408 && (!dblquote || pc != '"'))
Eric Andersenc470f442003-07-28 09:56:35 +000011409 STPUTC('\\', pout);
11410 if (pc > PEOA_OR_PEOF) {
11411 break;
11412 }
11413 /* fall through */
11414
11415 case PEOF:
Denis Vlasenko131ae172007-02-18 13:00:19 +000011416#if ENABLE_ASH_ALIAS
Eric Andersenc470f442003-07-28 09:56:35 +000011417 case PEOA:
11418#endif
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011419 startlinno = g_parsefile->linno;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000011420 raise_error_syntax("EOF in backquote substitution");
Eric Andersenc470f442003-07-28 09:56:35 +000011421
11422 case '\n':
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011423 g_parsefile->linno++;
Eric Andersenc470f442003-07-28 09:56:35 +000011424 needprompt = doprompt;
11425 break;
11426
11427 default:
11428 break;
11429 }
11430 STPUTC(pc, pout);
11431 }
Denis Vlasenko5cedb752007-02-18 19:56:41 +000011432 done:
Eric Andersenc470f442003-07-28 09:56:35 +000011433 STPUTC('\0', pout);
11434 psavelen = pout - (char *)stackblock();
11435 if (psavelen > 0) {
11436 pstr = grabstackstr(pout);
11437 setinputstring(pstr);
11438 }
11439 }
11440 nlpp = &bqlist;
11441 while (*nlpp)
11442 nlpp = &(*nlpp)->next;
Denis Vlasenko597906c2008-02-20 16:38:54 +000011443 *nlpp = stzalloc(sizeof(**nlpp));
11444 /* (*nlpp)->next = NULL; - stzalloc did it */
Eric Andersenc470f442003-07-28 09:56:35 +000011445 parsebackquote = oldstyle;
11446
11447 if (oldstyle) {
11448 saveprompt = doprompt;
11449 doprompt = 0;
Eric Andersencb57d552001-06-28 07:25:16 +000011450 }
11451
Eric Andersenc470f442003-07-28 09:56:35 +000011452 n = list(2);
11453
11454 if (oldstyle)
11455 doprompt = saveprompt;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011456 else if (readtoken() != TRP)
11457 raise_error_unexpected_syntax(TRP);
Eric Andersenc470f442003-07-28 09:56:35 +000011458
11459 (*nlpp)->n = n;
11460 if (oldstyle) {
11461 /*
11462 * Start reading from old file again, ignoring any pushed back
11463 * tokens left from the backquote parsing
11464 */
11465 popfile();
11466 tokpushback = 0;
11467 }
11468 while (stackblocksize() <= savelen)
11469 growstackblock();
11470 STARTSTACKSTR(out);
11471 if (str) {
11472 memcpy(out, str, savelen);
11473 STADJUST(savelen, out);
Denis Vlasenkob012b102007-02-19 22:43:01 +000011474 INT_OFF;
11475 free(str);
Eric Andersenc470f442003-07-28 09:56:35 +000011476 str = NULL;
Denis Vlasenkob012b102007-02-19 22:43:01 +000011477 INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +000011478 }
11479 parsebackquote = savepbq;
Denis Vlasenko2da584f2007-02-19 22:44:05 +000011480 exception_handler = savehandler;
Eric Andersenc470f442003-07-28 09:56:35 +000011481 if (arinest || dblquote)
11482 USTPUTC(CTLBACKQ | CTLQUOTE, out);
11483 else
11484 USTPUTC(CTLBACKQ, out);
11485 if (oldstyle)
11486 goto parsebackq_oldreturn;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000011487 goto parsebackq_newreturn;
Eric Andersenc470f442003-07-28 09:56:35 +000011488}
11489
Mike Frysinger98c52642009-04-02 10:02:37 +000011490#if ENABLE_SH_MATH_SUPPORT
Eric Andersencb57d552001-06-28 07:25:16 +000011491/*
11492 * Parse an arithmetic expansion (indicate start of one and set state)
11493 */
Eric Andersenc470f442003-07-28 09:56:35 +000011494parsearith: {
Eric Andersenc470f442003-07-28 09:56:35 +000011495 if (++arinest == 1) {
11496 prevsyntax = syntax;
11497 syntax = ARISYNTAX;
11498 USTPUTC(CTLARI, out);
11499 if (dblquote)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000011500 USTPUTC('"', out);
Eric Andersenc470f442003-07-28 09:56:35 +000011501 else
Denis Vlasenkoa624c112007-02-19 22:45:43 +000011502 USTPUTC(' ', out);
Eric Andersenc470f442003-07-28 09:56:35 +000011503 } else {
11504 /*
11505 * we collapse embedded arithmetic expansion to
11506 * parenthesis, which should be equivalent
11507 */
11508 USTPUTC('(', out);
Eric Andersencb57d552001-06-28 07:25:16 +000011509 }
Eric Andersenc470f442003-07-28 09:56:35 +000011510 goto parsearith_return;
11511}
11512#endif
Eric Andersencb57d552001-06-28 07:25:16 +000011513
Eric Andersenc470f442003-07-28 09:56:35 +000011514} /* end of readtoken */
11515
Eric Andersencb57d552001-06-28 07:25:16 +000011516/*
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011517 * Read the next input token.
11518 * If the token is a word, we set backquotelist to the list of cmds in
11519 * backquotes. We set quoteflag to true if any part of the word was
11520 * quoted.
11521 * If the token is TREDIR, then we set redirnode to a structure containing
11522 * the redirection.
11523 * In all cases, the variable startlinno is set to the number of the line
11524 * on which the token starts.
11525 *
11526 * [Change comment: here documents and internal procedures]
11527 * [Readtoken shouldn't have any arguments. Perhaps we should make the
11528 * word parsing code into a separate routine. In this case, readtoken
11529 * doesn't need to have any internal procedures, but parseword does.
11530 * We could also make parseoperator in essence the main routine, and
11531 * have parseword (readtoken1?) handle both words and redirection.]
Eric Andersencb57d552001-06-28 07:25:16 +000011532 */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011533#define NEW_xxreadtoken
11534#ifdef NEW_xxreadtoken
11535/* singles must be first! */
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000011536static const char xxreadtoken_chars[7] ALIGN1 = {
Denis Vlasenko834dee72008-10-07 09:18:30 +000011537 '\n', '(', ')', /* singles */
11538 '&', '|', ';', /* doubles */
11539 0
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000011540};
Eric Andersencb57d552001-06-28 07:25:16 +000011541
Denis Vlasenko834dee72008-10-07 09:18:30 +000011542#define xxreadtoken_singles 3
11543#define xxreadtoken_doubles 3
11544
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000011545static const char xxreadtoken_tokens[] ALIGN1 = {
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011546 TNL, TLP, TRP, /* only single occurrence allowed */
11547 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
11548 TEOF, /* corresponds to trailing nul */
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000011549 TAND, TOR, TENDCASE /* if double occurrence */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011550};
11551
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011552static int
11553xxreadtoken(void)
11554{
11555 int c;
11556
11557 if (tokpushback) {
11558 tokpushback = 0;
11559 return lasttoken;
Eric Andersencb57d552001-06-28 07:25:16 +000011560 }
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011561 if (needprompt) {
11562 setprompt(2);
11563 }
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011564 startlinno = g_parsefile->linno;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011565 for (;;) { /* until token or start of word found */
Denis Vlasenko834dee72008-10-07 09:18:30 +000011566 c = pgetc_fast();
Denis Vlasenko5e34ff22009-04-21 11:09:40 +000011567 if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA))
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011568 continue;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011569
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011570 if (c == '#') {
11571 while ((c = pgetc()) != '\n' && c != PEOF)
11572 continue;
11573 pungetc();
11574 } else if (c == '\\') {
11575 if (pgetc() != '\n') {
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011576 pungetc();
Denis Vlasenko834dee72008-10-07 09:18:30 +000011577 break; /* return readtoken1(...) */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011578 }
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011579 startlinno = ++g_parsefile->linno;
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011580 if (doprompt)
11581 setprompt(2);
11582 } else {
11583 const char *p;
11584
11585 p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
11586 if (c != PEOF) {
11587 if (c == '\n') {
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011588 g_parsefile->linno++;
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011589 needprompt = doprompt;
11590 }
11591
11592 p = strchr(xxreadtoken_chars, c);
Denis Vlasenko834dee72008-10-07 09:18:30 +000011593 if (p == NULL)
11594 break; /* return readtoken1(...) */
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011595
Denis Vlasenko834dee72008-10-07 09:18:30 +000011596 if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) {
11597 int cc = pgetc();
11598 if (cc == c) { /* double occurrence? */
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011599 p += xxreadtoken_doubles + 1;
11600 } else {
11601 pungetc();
Denis Vlasenko834dee72008-10-07 09:18:30 +000011602#if ENABLE_ASH_BASH_COMPAT
11603 if (c == '&' && cc == '>') /* &> */
11604 break; /* return readtoken1(...) */
11605#endif
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011606 }
11607 }
11608 }
11609 lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
11610 return lasttoken;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011611 }
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011612 } /* for (;;) */
Denis Vlasenko834dee72008-10-07 09:18:30 +000011613
11614 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011615}
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011616#else /* old xxreadtoken */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011617#define RETURN(token) return lasttoken = token
11618static int
11619xxreadtoken(void)
11620{
11621 int c;
11622
11623 if (tokpushback) {
11624 tokpushback = 0;
11625 return lasttoken;
11626 }
11627 if (needprompt) {
11628 setprompt(2);
11629 }
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011630 startlinno = g_parsefile->linno;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011631 for (;;) { /* until token or start of word found */
Denis Vlasenko834dee72008-10-07 09:18:30 +000011632 c = pgetc_fast();
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011633 switch (c) {
11634 case ' ': case '\t':
11635#if ENABLE_ASH_ALIAS
11636 case PEOA:
11637#endif
11638 continue;
11639 case '#':
Denis Vlasenkof7d56652008-03-25 05:51:41 +000011640 while ((c = pgetc()) != '\n' && c != PEOF)
11641 continue;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011642 pungetc();
11643 continue;
11644 case '\\':
11645 if (pgetc() == '\n') {
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011646 startlinno = ++g_parsefile->linno;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011647 if (doprompt)
11648 setprompt(2);
11649 continue;
11650 }
11651 pungetc();
11652 goto breakloop;
11653 case '\n':
Denis Vlasenko41eb3002008-11-28 03:42:31 +000011654 g_parsefile->linno++;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011655 needprompt = doprompt;
11656 RETURN(TNL);
11657 case PEOF:
11658 RETURN(TEOF);
11659 case '&':
11660 if (pgetc() == '&')
11661 RETURN(TAND);
11662 pungetc();
11663 RETURN(TBACKGND);
11664 case '|':
11665 if (pgetc() == '|')
11666 RETURN(TOR);
11667 pungetc();
11668 RETURN(TPIPE);
11669 case ';':
11670 if (pgetc() == ';')
11671 RETURN(TENDCASE);
11672 pungetc();
11673 RETURN(TSEMI);
11674 case '(':
11675 RETURN(TLP);
11676 case ')':
11677 RETURN(TRP);
11678 default:
11679 goto breakloop;
11680 }
11681 }
11682 breakloop:
11683 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
11684#undef RETURN
11685}
Denis Vlasenko176d49d2008-10-06 09:51:47 +000011686#endif /* old xxreadtoken */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011687
11688static int
11689readtoken(void)
11690{
11691 int t;
11692#if DEBUG
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000011693 smallint alreadyseen = tokpushback;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011694#endif
11695
11696#if ENABLE_ASH_ALIAS
11697 top:
11698#endif
11699
11700 t = xxreadtoken();
11701
11702 /*
11703 * eat newlines
11704 */
11705 if (checkkwd & CHKNL) {
11706 while (t == TNL) {
11707 parseheredoc();
11708 t = xxreadtoken();
11709 }
11710 }
11711
11712 if (t != TWORD || quoteflag) {
11713 goto out;
11714 }
11715
11716 /*
11717 * check for keywords
11718 */
11719 if (checkkwd & CHKKWD) {
11720 const char *const *pp;
11721
11722 pp = findkwd(wordtext);
11723 if (pp) {
11724 lasttoken = t = pp - tokname_array;
11725 TRACE(("keyword %s recognized\n", tokname(t)));
11726 goto out;
11727 }
11728 }
11729
11730 if (checkkwd & CHKALIAS) {
11731#if ENABLE_ASH_ALIAS
11732 struct alias *ap;
11733 ap = lookupalias(wordtext, 1);
11734 if (ap != NULL) {
11735 if (*ap->val) {
11736 pushstring(ap->val, ap);
11737 }
11738 goto top;
11739 }
11740#endif
11741 }
11742 out:
11743 checkkwd = 0;
11744#if DEBUG
11745 if (!alreadyseen)
11746 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11747 else
11748 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
11749#endif
11750 return t;
Eric Andersencb57d552001-06-28 07:25:16 +000011751}
11752
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011753static char
11754peektoken(void)
11755{
11756 int t;
11757
11758 t = readtoken();
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000011759 tokpushback = 1;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011760 return tokname_array[t][0];
11761}
Eric Andersencb57d552001-06-28 07:25:16 +000011762
11763/*
Denys Vlasenko86e83ec2009-07-23 22:07:07 +020011764 * Read and parse a command. Returns NODE_EOF on end of file.
11765 * (NULL is a valid parse tree indicating a blank line.)
Eric Andersencb57d552001-06-28 07:25:16 +000011766 */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011767static union node *
11768parsecmd(int interact)
Eric Andersen90898442003-08-06 11:20:52 +000011769{
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011770 int t;
Eric Andersencb57d552001-06-28 07:25:16 +000011771
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011772 tokpushback = 0;
11773 doprompt = interact;
11774 if (doprompt)
11775 setprompt(doprompt);
11776 needprompt = 0;
11777 t = readtoken();
11778 if (t == TEOF)
Denys Vlasenko86e83ec2009-07-23 22:07:07 +020011779 return NODE_EOF;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011780 if (t == TNL)
11781 return NULL;
Denis Vlasenkobcceb0c2007-09-21 18:06:20 +000011782 tokpushback = 1;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011783 return list(1);
11784}
11785
11786/*
11787 * Input any here documents.
11788 */
11789static void
11790parseheredoc(void)
11791{
11792 struct heredoc *here;
11793 union node *n;
11794
11795 here = heredoclist;
Denis Vlasenko838ffd52008-02-21 04:32:08 +000011796 heredoclist = NULL;
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011797
11798 while (here) {
11799 if (needprompt) {
11800 setprompt(2);
11801 }
11802 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
11803 here->eofmark, here->striptabs);
Denis Vlasenko597906c2008-02-20 16:38:54 +000011804 n = stzalloc(sizeof(struct narg));
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011805 n->narg.type = NARG;
Denis Vlasenko597906c2008-02-20 16:38:54 +000011806 /*n->narg.next = NULL; - stzalloc did it */
Denis Vlasenkoaa744452007-02-23 01:04:22 +000011807 n->narg.text = wordtext;
11808 n->narg.backquote = backquotelist;
11809 here->here->nhere.doc = n;
11810 here = here->next;
Eric Andersencb57d552001-06-28 07:25:16 +000011811 }
Eric Andersencb57d552001-06-28 07:25:16 +000011812}
11813
11814
11815/*
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +000011816 * called by editline -- any expansions to the prompt should be added here.
Eric Andersencb57d552001-06-28 07:25:16 +000011817 */
Denis Vlasenko131ae172007-02-18 13:00:19 +000011818#if ENABLE_ASH_EXPAND_PRMT
"Vladimir N. Oleynik"bef14d72005-09-05 13:25:11 +000011819static const char *
11820expandstr(const char *ps)
11821{
11822 union node n;
11823
Denis Vlasenko5c2b8142009-03-19 01:59:59 +000011824 /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value,
11825 * and token processing _can_ alter it (delete NULs etc). */
"Vladimir N. Oleynik"bef14d72005-09-05 13:25:11 +000011826 setinputstring((char *)ps);
Denis Vlasenko46a53062007-09-24 18:30:02 +000011827 readtoken1(pgetc(), PSSYNTAX, nullstr, 0);
"Vladimir N. Oleynik"bef14d72005-09-05 13:25:11 +000011828 popfile();
11829
11830 n.narg.type = NARG;
11831 n.narg.next = NULL;
11832 n.narg.text = wordtext;
11833 n.narg.backquote = backquotelist;
11834
11835 expandarg(&n, NULL, 0);
11836 return stackblock();
11837}
11838#endif
11839
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011840/*
11841 * Execute a command or commands contained in a string.
11842 */
11843static int
11844evalstring(char *s, int mask)
Eric Andersenc470f442003-07-28 09:56:35 +000011845{
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011846 union node *n;
11847 struct stackmark smark;
11848 int skip;
11849
11850 setinputstring(s);
11851 setstackmark(&smark);
11852
11853 skip = 0;
Denys Vlasenko86e83ec2009-07-23 22:07:07 +020011854 while ((n = parsecmd(0)) != NODE_EOF) {
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011855 evaltree(n, 0);
11856 popstackmark(&smark);
11857 skip = evalskip;
11858 if (skip)
11859 break;
11860 }
11861 popfile();
11862
11863 skip &= mask;
11864 evalskip = skip;
11865 return skip;
Eric Andersenc470f442003-07-28 09:56:35 +000011866}
11867
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011868/*
11869 * The eval command.
11870 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020011871static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000011872evalcmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011873{
11874 char *p;
11875 char *concat;
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011876
Denis Vlasenko68404f12008-03-17 09:00:54 +000011877 if (argv[1]) {
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011878 p = argv[1];
Denis Vlasenko68404f12008-03-17 09:00:54 +000011879 argv += 2;
11880 if (argv[0]) {
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011881 STARTSTACKSTR(concat);
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011882 for (;;) {
11883 concat = stack_putstr(p, concat);
Denis Vlasenko68404f12008-03-17 09:00:54 +000011884 p = *argv++;
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011885 if (p == NULL)
11886 break;
11887 STPUTC(' ', concat);
11888 }
11889 STPUTC('\0', concat);
11890 p = grabstackstr(concat);
11891 }
11892 evalstring(p, ~SKIPEVAL);
11893
11894 }
11895 return exitstatus;
11896}
11897
11898/*
11899 * Read and execute commands. "Top" is nonzero for the top level command
11900 * loop; it turns on prompting if the shell is interactive.
11901 */
11902static int
11903cmdloop(int top)
11904{
11905 union node *n;
11906 struct stackmark smark;
11907 int inter;
11908 int numeof = 0;
11909
11910 TRACE(("cmdloop(%d) called\n", top));
11911 for (;;) {
11912 int skip;
11913
11914 setstackmark(&smark);
11915#if JOBS
Denis Vlasenkob07a4962008-06-22 13:16:23 +000011916 if (doing_jobctl)
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011917 showjobs(stderr, SHOW_CHANGED);
11918#endif
11919 inter = 0;
11920 if (iflag && top) {
11921 inter++;
11922#if ENABLE_ASH_MAIL
11923 chkmail();
11924#endif
11925 }
11926 n = parsecmd(inter);
Denys Vlasenko7cee00e2009-07-24 01:08:03 +020011927#if DEBUG
11928 if (DEBUG > 2 && debug && (n != NODE_EOF))
Denys Vlasenko883cea42009-07-11 15:31:59 +020011929 showtree(n);
Denis Vlasenko135cecb2009-04-12 00:00:57 +000011930#endif
Denys Vlasenko86e83ec2009-07-23 22:07:07 +020011931 if (n == NODE_EOF) {
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011932 if (!top || numeof >= 50)
11933 break;
11934 if (!stoppedjobs()) {
11935 if (!Iflag)
11936 break;
11937 out2str("\nUse \"exit\" to leave shell.\n");
11938 }
11939 numeof++;
11940 } else if (nflag == 0) {
Denis Vlasenkofcfaf2e2007-07-14 18:45:37 +000011941 /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */
11942 job_warning >>= 1;
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011943 numeof = 0;
11944 evaltree(n, 0);
11945 }
11946 popstackmark(&smark);
11947 skip = evalskip;
11948
11949 if (skip) {
11950 evalskip = 0;
11951 return skip & SKIPEVAL;
11952 }
11953 }
11954 return 0;
11955}
11956
Denis Vlasenko0dec6de2007-02-23 21:10:47 +000011957/*
11958 * Take commands from a file. To be compatible we should do a path
11959 * search for the file, which is necessary to find sub-commands.
11960 */
11961static char *
11962find_dot_file(char *name)
11963{
11964 char *fullname;
11965 const char *path = pathval();
11966 struct stat statb;
11967
11968 /* don't try this for absolute or relative paths */
11969 if (strchr(name, '/'))
11970 return name;
11971
Denis Vlasenko8ad78e12009-02-15 12:40:30 +000011972 /* IIRC standards do not say whether . is to be searched.
11973 * And it is even smaller this way, making it unconditional for now:
11974 */
11975 if (1) { /* ENABLE_ASH_BASH_COMPAT */
11976 fullname = name;
11977 goto try_cur_dir;
11978 }
11979
Denys Vlasenko82a6fb32009-06-14 19:42:12 +020011980 while ((fullname = path_advance(&path, name)) != NULL) {
Denis Vlasenko8ad78e12009-02-15 12:40:30 +000011981 try_cur_dir:
Denis Vlasenko0dec6de2007-02-23 21:10:47 +000011982 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
11983 /*
11984 * Don't bother freeing here, since it will
11985 * be freed by the caller.
11986 */
11987 return fullname;
11988 }
Denys Vlasenko82a6fb32009-06-14 19:42:12 +020011989 if (fullname != name)
11990 stunalloc(fullname);
Denis Vlasenko0dec6de2007-02-23 21:10:47 +000011991 }
11992
11993 /* not found in the PATH */
11994 ash_msg_and_raise_error("%s: not found", name);
11995 /* NOTREACHED */
11996}
11997
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020011998static int FAST_FUNC
Denis Vlasenko0c032a42007-02-23 01:03:40 +000011999dotcmd(int argc, char **argv)
12000{
12001 struct strlist *sp;
12002 volatile struct shparam saveparam;
12003 int status = 0;
12004
12005 for (sp = cmdenviron; sp; sp = sp->next)
Denis Vlasenko4222ae42007-02-25 02:37:49 +000012006 setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012007
Denis Vlasenko68404f12008-03-17 09:00:54 +000012008 if (argv[1]) { /* That's what SVR2 does */
12009 char *fullname = find_dot_file(argv[1]);
12010 argv += 2;
12011 argc -= 2;
12012 if (argc) { /* argc > 0, argv[0] != NULL */
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012013 saveparam = shellparam;
Denis Vlasenko01631112007-12-16 17:20:38 +000012014 shellparam.malloced = 0;
Denis Vlasenko68404f12008-03-17 09:00:54 +000012015 shellparam.nparam = argc;
12016 shellparam.p = argv;
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012017 };
12018
12019 setinputfile(fullname, INPUT_PUSH_FILE);
12020 commandname = fullname;
12021 cmdloop(0);
12022 popfile();
12023
Denis Vlasenko68404f12008-03-17 09:00:54 +000012024 if (argc) {
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012025 freeparam(&shellparam);
12026 shellparam = saveparam;
12027 };
12028 status = exitstatus;
12029 }
12030 return status;
12031}
12032
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012033static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012034exitcmd(int argc UNUSED_PARAM, char **argv)
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012035{
12036 if (stoppedjobs())
12037 return 0;
Denis Vlasenko68404f12008-03-17 09:00:54 +000012038 if (argv[1])
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012039 exitstatus = number(argv[1]);
12040 raise_exception(EXEXIT);
12041 /* NOTREACHED */
12042}
12043
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012044/*
12045 * Read a file containing shell functions.
12046 */
12047static void
12048readcmdfile(char *name)
12049{
12050 setinputfile(name, INPUT_PUSH_FILE);
12051 cmdloop(0);
12052 popfile();
12053}
12054
12055
Denis Vlasenkocc571512007-02-23 21:10:35 +000012056/* ============ find_command inplementation */
12057
12058/*
12059 * Resolve a command name. If you change this routine, you may have to
12060 * change the shellexec routine as well.
12061 */
12062static void
12063find_command(char *name, struct cmdentry *entry, int act, const char *path)
12064{
12065 struct tblentry *cmdp;
12066 int idx;
12067 int prev;
12068 char *fullname;
12069 struct stat statb;
12070 int e;
12071 int updatetbl;
12072 struct builtincmd *bcmd;
12073
12074 /* If name contains a slash, don't use PATH or hash table */
12075 if (strchr(name, '/') != NULL) {
12076 entry->u.index = -1;
12077 if (act & DO_ABS) {
12078 while (stat(name, &statb) < 0) {
12079#ifdef SYSV
12080 if (errno == EINTR)
12081 continue;
12082#endif
12083 entry->cmdtype = CMDUNKNOWN;
12084 return;
12085 }
12086 }
12087 entry->cmdtype = CMDNORMAL;
12088 return;
12089 }
12090
Denis Vlasenkof20de5b2007-04-29 23:42:54 +000012091/* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */
Denis Vlasenkocc571512007-02-23 21:10:35 +000012092
12093 updatetbl = (path == pathval());
12094 if (!updatetbl) {
12095 act |= DO_ALTPATH;
12096 if (strstr(path, "%builtin") != NULL)
12097 act |= DO_ALTBLTIN;
12098 }
12099
12100 /* If name is in the table, check answer will be ok */
12101 cmdp = cmdlookup(name, 0);
12102 if (cmdp != NULL) {
12103 int bit;
12104
12105 switch (cmdp->cmdtype) {
12106 default:
12107#if DEBUG
12108 abort();
12109#endif
12110 case CMDNORMAL:
12111 bit = DO_ALTPATH;
12112 break;
12113 case CMDFUNCTION:
12114 bit = DO_NOFUNC;
12115 break;
12116 case CMDBUILTIN:
12117 bit = DO_ALTBLTIN;
12118 break;
12119 }
12120 if (act & bit) {
12121 updatetbl = 0;
12122 cmdp = NULL;
12123 } else if (cmdp->rehash == 0)
12124 /* if not invalidated by cd, we're done */
12125 goto success;
12126 }
12127
12128 /* If %builtin not in path, check for builtin next */
12129 bcmd = find_builtin(name);
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +000012130 if (bcmd) {
12131 if (IS_BUILTIN_REGULAR(bcmd))
12132 goto builtin_success;
12133 if (act & DO_ALTPATH) {
12134 if (!(act & DO_ALTBLTIN))
12135 goto builtin_success;
12136 } else if (builtinloc <= 0) {
12137 goto builtin_success;
Denis Vlasenko8e858e22007-03-07 09:35:43 +000012138 }
Denis Vlasenkof98dc4d2007-02-23 21:11:02 +000012139 }
Denis Vlasenkocc571512007-02-23 21:10:35 +000012140
Denis Vlasenkof20de5b2007-04-29 23:42:54 +000012141#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko7465dbc2008-04-13 02:25:53 +000012142 {
12143 int applet_no = find_applet_by_name(name);
12144 if (applet_no >= 0) {
12145 entry->cmdtype = CMDNORMAL;
12146 entry->u.index = -2 - applet_no;
12147 return;
12148 }
Denis Vlasenkof20de5b2007-04-29 23:42:54 +000012149 }
12150#endif
12151
Denis Vlasenkocc571512007-02-23 21:10:35 +000012152 /* We have to search path. */
12153 prev = -1; /* where to start */
12154 if (cmdp && cmdp->rehash) { /* doing a rehash */
12155 if (cmdp->cmdtype == CMDBUILTIN)
12156 prev = builtinloc;
12157 else
12158 prev = cmdp->param.index;
12159 }
12160
12161 e = ENOENT;
12162 idx = -1;
12163 loop:
Denys Vlasenko82a6fb32009-06-14 19:42:12 +020012164 while ((fullname = path_advance(&path, name)) != NULL) {
Denis Vlasenkocc571512007-02-23 21:10:35 +000012165 stunalloc(fullname);
Denis Vlasenkodee82b62007-07-29 14:05:27 +000012166 /* NB: code below will still use fullname
12167 * despite it being "unallocated" */
Denis Vlasenkocc571512007-02-23 21:10:35 +000012168 idx++;
12169 if (pathopt) {
12170 if (prefix(pathopt, "builtin")) {
12171 if (bcmd)
12172 goto builtin_success;
12173 continue;
Denis Vlasenko4a9ca132008-04-12 20:07:08 +000012174 }
12175 if ((act & DO_NOFUNC)
12176 || !prefix(pathopt, "func")
12177 ) { /* ignore unimplemented options */
Denis Vlasenkocc571512007-02-23 21:10:35 +000012178 continue;
12179 }
12180 }
12181 /* if rehash, don't redo absolute path names */
12182 if (fullname[0] == '/' && idx <= prev) {
12183 if (idx < prev)
12184 continue;
12185 TRACE(("searchexec \"%s\": no change\n", name));
12186 goto success;
12187 }
12188 while (stat(fullname, &statb) < 0) {
12189#ifdef SYSV
12190 if (errno == EINTR)
12191 continue;
12192#endif
12193 if (errno != ENOENT && errno != ENOTDIR)
12194 e = errno;
12195 goto loop;
12196 }
12197 e = EACCES; /* if we fail, this will be the error */
12198 if (!S_ISREG(statb.st_mode))
12199 continue;
12200 if (pathopt) { /* this is a %func directory */
12201 stalloc(strlen(fullname) + 1);
Denis Vlasenkodee82b62007-07-29 14:05:27 +000012202 /* NB: stalloc will return space pointed by fullname
12203 * (because we don't have any intervening allocations
12204 * between stunalloc above and this stalloc) */
Denis Vlasenkocc571512007-02-23 21:10:35 +000012205 readcmdfile(fullname);
12206 cmdp = cmdlookup(name, 0);
12207 if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION)
12208 ash_msg_and_raise_error("%s not defined in %s", name, fullname);
12209 stunalloc(fullname);
12210 goto success;
12211 }
12212 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
12213 if (!updatetbl) {
12214 entry->cmdtype = CMDNORMAL;
12215 entry->u.index = idx;
12216 return;
12217 }
12218 INT_OFF;
12219 cmdp = cmdlookup(name, 1);
12220 cmdp->cmdtype = CMDNORMAL;
12221 cmdp->param.index = idx;
12222 INT_ON;
12223 goto success;
12224 }
12225
12226 /* We failed. If there was an entry for this command, delete it */
12227 if (cmdp && updatetbl)
12228 delete_cmd_entry();
12229 if (act & DO_ERR)
12230 ash_msg("%s: %s", name, errmsg(e, "not found"));
12231 entry->cmdtype = CMDUNKNOWN;
12232 return;
12233
12234 builtin_success:
12235 if (!updatetbl) {
12236 entry->cmdtype = CMDBUILTIN;
12237 entry->u.cmd = bcmd;
12238 return;
12239 }
12240 INT_OFF;
12241 cmdp = cmdlookup(name, 1);
12242 cmdp->cmdtype = CMDBUILTIN;
12243 cmdp->param.cmd = bcmd;
12244 INT_ON;
12245 success:
12246 cmdp->rehash = 0;
12247 entry->cmdtype = cmdp->cmdtype;
12248 entry->u = cmdp->param;
12249}
12250
12251
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000012252/* ============ trap.c */
Eric Andersenc470f442003-07-28 09:56:35 +000012253
Eric Andersencb57d552001-06-28 07:25:16 +000012254/*
Eric Andersencb57d552001-06-28 07:25:16 +000012255 * The trap builtin.
12256 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012257static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012258trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Eric Andersencb57d552001-06-28 07:25:16 +000012259{
12260 char *action;
12261 char **ap;
12262 int signo;
12263
Eric Andersenc470f442003-07-28 09:56:35 +000012264 nextopt(nullstr);
12265 ap = argptr;
12266 if (!*ap) {
Denis Vlasenko2da584f2007-02-19 22:44:05 +000012267 for (signo = 0; signo < NSIG; signo++) {
Denys Vlasenko21d87d42009-09-25 00:06:51 +020012268 char *tr = trap_ptr[signo];
12269 if (tr) {
Denys Vlasenkoe74aaf92009-09-27 02:05:45 +020012270 /* note: bash adds "SIG", but only if invoked
12271 * as "bash". If called as "sh", or if set -o posix,
12272 * then it prints short signal names.
12273 * We are printing short names: */
12274 out1fmt("trap -- %s %s\n",
Denys Vlasenko21d87d42009-09-25 00:06:51 +020012275 single_quote(tr),
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +000012276 get_signame(signo));
Denys Vlasenko726e1a02009-09-25 02:58:20 +020012277 /* trap_ptr != trap only if we are in special-cased `trap` code.
12278 * In this case, we will exit very soon, no need to free(). */
Denys Vlasenkoe74aaf92009-09-27 02:05:45 +020012279 /* if (trap_ptr != trap && tp[0]) */
Denys Vlasenko726e1a02009-09-25 02:58:20 +020012280 /* free(tr); */
Eric Andersencb57d552001-06-28 07:25:16 +000012281 }
12282 }
Denys Vlasenko726e1a02009-09-25 02:58:20 +020012283 /*
Denys Vlasenko21d87d42009-09-25 00:06:51 +020012284 if (trap_ptr != trap) {
12285 free(trap_ptr);
12286 trap_ptr = trap;
12287 }
Denys Vlasenko726e1a02009-09-25 02:58:20 +020012288 */
Eric Andersencb57d552001-06-28 07:25:16 +000012289 return 0;
12290 }
Denys Vlasenko21d87d42009-09-25 00:06:51 +020012291
Denis Vlasenko4e19a9c2008-07-26 13:45:57 +000012292 action = NULL;
12293 if (ap[1])
Eric Andersencb57d552001-06-28 07:25:16 +000012294 action = *ap++;
12295 while (*ap) {
Denis Vlasenko5cedb752007-02-18 19:56:41 +000012296 signo = get_signum(*ap);
12297 if (signo < 0)
Denis Vlasenkob012b102007-02-19 22:43:01 +000012298 ash_msg_and_raise_error("%s: bad trap", *ap);
12299 INT_OFF;
Eric Andersencb57d552001-06-28 07:25:16 +000012300 if (action) {
Denis Vlasenko9f739442006-12-16 23:49:13 +000012301 if (LONE_DASH(action))
Eric Andersencb57d552001-06-28 07:25:16 +000012302 action = NULL;
12303 else
Denis Vlasenko0c032a42007-02-23 01:03:40 +000012304 action = ckstrdup(action);
Eric Andersencb57d552001-06-28 07:25:16 +000012305 }
Denis Vlasenko60818682007-09-28 22:07:23 +000012306 free(trap[signo]);
Eric Andersencb57d552001-06-28 07:25:16 +000012307 trap[signo] = action;
12308 if (signo != 0)
12309 setsignal(signo);
Denis Vlasenkob012b102007-02-19 22:43:01 +000012310 INT_ON;
Eric Andersencb57d552001-06-28 07:25:16 +000012311 ap++;
12312 }
12313 return 0;
12314}
12315
Eric Andersenc470f442003-07-28 09:56:35 +000012316
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000012317/* ============ Builtins */
Eric Andersenc470f442003-07-28 09:56:35 +000012318
Denis Vlasenko8e1c7152007-01-22 07:21:38 +000012319#if !ENABLE_FEATURE_SH_EXTRA_QUIET
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +000012320/*
12321 * Lists available builtins
12322 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012323static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012324helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Eric Andersenc470f442003-07-28 09:56:35 +000012325{
Denis Vlasenko6b06cb82008-05-15 21:30:45 +000012326 unsigned col;
12327 unsigned i;
Eric Andersenc470f442003-07-28 09:56:35 +000012328
Denys Vlasenkod6b05eb2009-06-06 20:59:55 +020012329 out1fmt(
Denis Vlasenko34d4d892009-04-04 20:24:37 +000012330 "Built-in commands:\n"
12331 "------------------\n");
Denis Vlasenkob71c6682007-07-21 15:08:09 +000012332 for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) {
Eric Andersenc470f442003-07-28 09:56:35 +000012333 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
Denis Vlasenko52764022007-02-24 13:42:56 +000012334 builtintab[i].name + 1);
Eric Andersenc470f442003-07-28 09:56:35 +000012335 if (col > 60) {
12336 out1fmt("\n");
12337 col = 0;
12338 }
12339 }
Denis Vlasenko80d14be2007-04-10 23:03:30 +000012340#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko1aa7e472007-11-28 06:49:03 +000012341 {
12342 const char *a = applet_names;
12343 while (*a) {
12344 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a);
12345 if (col > 60) {
12346 out1fmt("\n");
12347 col = 0;
12348 }
12349 a += strlen(a) + 1;
Eric Andersenc470f442003-07-28 09:56:35 +000012350 }
12351 }
12352#endif
12353 out1fmt("\n\n");
12354 return EXIT_SUCCESS;
12355}
Denis Vlasenko131ae172007-02-18 13:00:19 +000012356#endif /* FEATURE_SH_EXTRA_QUIET */
Eric Andersenc470f442003-07-28 09:56:35 +000012357
Eric Andersencb57d552001-06-28 07:25:16 +000012358/*
Eric Andersencb57d552001-06-28 07:25:16 +000012359 * The export and readonly commands.
12360 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012361static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012362exportcmd(int argc UNUSED_PARAM, char **argv)
Eric Andersencb57d552001-06-28 07:25:16 +000012363{
12364 struct var *vp;
12365 char *name;
12366 const char *p;
Eric Andersenc470f442003-07-28 09:56:35 +000012367 char **aptr;
Denis Vlasenkob7304742008-10-20 08:15:51 +000012368 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
Eric Andersencb57d552001-06-28 07:25:16 +000012369
Denis Vlasenko2da584f2007-02-19 22:44:05 +000012370 if (nextopt("p") != 'p') {
12371 aptr = argptr;
12372 name = *aptr;
12373 if (name) {
12374 do {
12375 p = strchr(name, '=');
12376 if (p != NULL) {
12377 p++;
12378 } else {
12379 vp = *findvar(hashvar(name), name);
12380 if (vp) {
12381 vp->flags |= flag;
12382 continue;
12383 }
Eric Andersencb57d552001-06-28 07:25:16 +000012384 }
Denis Vlasenko2da584f2007-02-19 22:44:05 +000012385 setvar(name, p, flag);
12386 } while ((name = *++aptr) != NULL);
12387 return 0;
12388 }
Eric Andersencb57d552001-06-28 07:25:16 +000012389 }
Denis Vlasenko2da584f2007-02-19 22:44:05 +000012390 showvars(argv[0], flag, 0);
Eric Andersencb57d552001-06-28 07:25:16 +000012391 return 0;
12392}
12393
Eric Andersencb57d552001-06-28 07:25:16 +000012394/*
Denis Vlasenko5651bfc2007-02-23 21:08:58 +000012395 * Delete a function if it exists.
Eric Andersencb57d552001-06-28 07:25:16 +000012396 */
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +000012397static void
Denis Vlasenko5651bfc2007-02-23 21:08:58 +000012398unsetfunc(const char *name)
Aaron Lehmannb6ecbdc2001-12-06 03:37:38 +000012399{
Denis Vlasenko5651bfc2007-02-23 21:08:58 +000012400 struct tblentry *cmdp;
Eric Andersencb57d552001-06-28 07:25:16 +000012401
Denis Vlasenko5651bfc2007-02-23 21:08:58 +000012402 cmdp = cmdlookup(name, 0);
12403 if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION)
12404 delete_cmd_entry();
Eric Andersenc470f442003-07-28 09:56:35 +000012405}
12406
Eric Andersencb57d552001-06-28 07:25:16 +000012407/*
Eric Andersencb57d552001-06-28 07:25:16 +000012408 * The unset builtin command. We unset the function before we unset the
12409 * variable to allow a function to be unset when there is a readonly variable
12410 * with the same name.
12411 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012412static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012413unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Eric Andersencb57d552001-06-28 07:25:16 +000012414{
12415 char **ap;
12416 int i;
Eric Andersenc470f442003-07-28 09:56:35 +000012417 int flag = 0;
Eric Andersencb57d552001-06-28 07:25:16 +000012418 int ret = 0;
12419
12420 while ((i = nextopt("vf")) != '\0') {
Eric Andersenc470f442003-07-28 09:56:35 +000012421 flag = i;
Eric Andersencb57d552001-06-28 07:25:16 +000012422 }
Eric Andersencb57d552001-06-28 07:25:16 +000012423
Denis Vlasenko2da584f2007-02-19 22:44:05 +000012424 for (ap = argptr; *ap; ap++) {
Eric Andersenc470f442003-07-28 09:56:35 +000012425 if (flag != 'f') {
12426 i = unsetvar(*ap);
12427 ret |= i;
12428 if (!(i & 2))
12429 continue;
12430 }
12431 if (flag != 'v')
Eric Andersencb57d552001-06-28 07:25:16 +000012432 unsetfunc(*ap);
Eric Andersencb57d552001-06-28 07:25:16 +000012433 }
Eric Andersenc470f442003-07-28 09:56:35 +000012434 return ret & 1;
Eric Andersencb57d552001-06-28 07:25:16 +000012435}
12436
12437
"Vladimir N. Oleynik"fb29b462006-01-15 14:21:01 +000012438/* setmode.c */
Eric Andersencb57d552001-06-28 07:25:16 +000012439
Eric Andersenc470f442003-07-28 09:56:35 +000012440#include <sys/times.h>
12441
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000012442static const unsigned char timescmd_str[] ALIGN1 = {
Manuel Novoa III 4456f252003-08-13 17:48:47 +000012443 ' ', offsetof(struct tms, tms_utime),
12444 '\n', offsetof(struct tms, tms_stime),
12445 ' ', offsetof(struct tms, tms_cutime),
12446 '\n', offsetof(struct tms, tms_cstime),
12447 0
12448};
Eric Andersencb57d552001-06-28 07:25:16 +000012449
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012450static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012451timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Manuel Novoa III 4456f252003-08-13 17:48:47 +000012452{
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +000012453 long clk_tck, s, t;
Manuel Novoa III 4456f252003-08-13 17:48:47 +000012454 const unsigned char *p;
12455 struct tms buf;
12456
12457 clk_tck = sysconf(_SC_CLK_TCK);
Eric Andersencb57d552001-06-28 07:25:16 +000012458 times(&buf);
Manuel Novoa III 4456f252003-08-13 17:48:47 +000012459
12460 p = timescmd_str;
12461 do {
12462 t = *(clock_t *)(((char *) &buf) + p[1]);
12463 s = t / clk_tck;
12464 out1fmt("%ldm%ld.%.3lds%c",
12465 s/60, s%60,
12466 ((t - s * clk_tck) * 1000) / clk_tck,
12467 p[0]);
12468 } while (*(p += 2));
12469
Eric Andersencb57d552001-06-28 07:25:16 +000012470 return 0;
12471}
12472
Mike Frysinger98c52642009-04-02 10:02:37 +000012473#if ENABLE_SH_MATH_SUPPORT
Eric Andersenc470f442003-07-28 09:56:35 +000012474/*
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +000012475 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12476 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
Eric Andersen90898442003-08-06 11:20:52 +000012477 *
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +000012478 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
Eric Andersenc470f442003-07-28 09:56:35 +000012479 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012480static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012481letcmd(int argc UNUSED_PARAM, char **argv)
Eric Andersenc470f442003-07-28 09:56:35 +000012482{
Denis Vlasenko68404f12008-03-17 09:00:54 +000012483 arith_t i;
Eric Andersenc470f442003-07-28 09:56:35 +000012484
Denis Vlasenko68404f12008-03-17 09:00:54 +000012485 argv++;
12486 if (!*argv)
Denis Vlasenkob012b102007-02-19 22:43:01 +000012487 ash_msg_and_raise_error("expression expected");
Denis Vlasenko68404f12008-03-17 09:00:54 +000012488 do {
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +000012489 i = ash_arith(*argv);
Denis Vlasenko68404f12008-03-17 09:00:54 +000012490 } while (*++argv);
Eric Andersenc470f442003-07-28 09:56:35 +000012491
Denis Vlasenkod9e15f22006-11-27 16:49:55 +000012492 return !i;
Eric Andersenc470f442003-07-28 09:56:35 +000012493}
Mike Frysinger98c52642009-04-02 10:02:37 +000012494#endif /* SH_MATH_SUPPORT */
Eric Andersenc470f442003-07-28 09:56:35 +000012495
Eric Andersenc470f442003-07-28 09:56:35 +000012496
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000012497/* ============ miscbltin.c
12498 *
Eric Andersenaff114c2004-04-14 17:51:38 +000012499 * Miscellaneous builtins.
Eric Andersenc470f442003-07-28 09:56:35 +000012500 */
12501
12502#undef rflag
12503
Denis Vlasenko83e5d6f2006-12-18 21:49:06 +000012504#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
Eric Andersenc470f442003-07-28 09:56:35 +000012505typedef enum __rlimit_resource rlim_t;
12506#endif
Eric Andersen74bcd162001-07-30 21:41:37 +000012507
Eric Andersenc470f442003-07-28 09:56:35 +000012508/*
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012509 * The read builtin. Options:
12510 * -r Do not interpret '\' specially
12511 * -s Turn off echo (tty only)
12512 * -n NCHARS Read NCHARS max
12513 * -p PROMPT Display PROMPT on stderr (if input is from tty)
12514 * -t SECONDS Timeout after SECONDS (tty or pipe only)
12515 * -u FD Read from given FD instead of fd 0
Eric Andersenc470f442003-07-28 09:56:35 +000012516 * This uses unbuffered input, which may be avoidable in some cases.
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012517 * TODO: bash also has:
12518 * -a ARRAY Read into array[0],[1],etc
12519 * -d DELIM End on DELIM char, not newline
12520 * -e Use line editing (tty only)
Eric Andersenc470f442003-07-28 09:56:35 +000012521 */
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012522static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012523readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Eric Andersenc470f442003-07-28 09:56:35 +000012524{
Denis Vlasenko9cd4c762008-06-18 19:22:19 +000012525 static const char *const arg_REPLY[] = { "REPLY", NULL };
12526
Eric Andersenc470f442003-07-28 09:56:35 +000012527 char **ap;
12528 int backslash;
12529 char c;
12530 int rflag;
12531 char *prompt;
12532 const char *ifs;
12533 char *p;
12534 int startword;
12535 int status;
12536 int i;
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012537 int fd = 0;
Denis Vlasenko131ae172007-02-18 13:00:19 +000012538#if ENABLE_ASH_READ_NCHARS
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012539 int nchars = 0; /* if != 0, -n is in effect */
Paul Fox02eb9342005-09-07 16:56:02 +000012540 int silent = 0;
12541 struct termios tty, old_tty;
12542#endif
Denis Vlasenko131ae172007-02-18 13:00:19 +000012543#if ENABLE_ASH_READ_TIMEOUT
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012544 unsigned end_ms = 0;
12545 unsigned timeout = 0;
Paul Fox02eb9342005-09-07 16:56:02 +000012546#endif
Eric Andersenc470f442003-07-28 09:56:35 +000012547
12548 rflag = 0;
12549 prompt = NULL;
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012550 while ((i = nextopt("p:u:r"
Denis Vlasenko5e34ff22009-04-21 11:09:40 +000012551 IF_ASH_READ_TIMEOUT("t:")
12552 IF_ASH_READ_NCHARS("n:s")
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012553 )) != '\0') {
Denis Vlasenkobf0a2012006-12-26 10:42:51 +000012554 switch (i) {
Paul Fox02eb9342005-09-07 16:56:02 +000012555 case 'p':
Eric Andersenc470f442003-07-28 09:56:35 +000012556 prompt = optionarg;
Paul Fox02eb9342005-09-07 16:56:02 +000012557 break;
Denis Vlasenko131ae172007-02-18 13:00:19 +000012558#if ENABLE_ASH_READ_NCHARS
Paul Fox02eb9342005-09-07 16:56:02 +000012559 case 'n':
Denis Vlasenko037576d2007-10-20 18:30:38 +000012560 nchars = bb_strtou(optionarg, NULL, 10);
12561 if (nchars < 0 || errno)
Denis Vlasenkob012b102007-02-19 22:43:01 +000012562 ash_msg_and_raise_error("invalid count");
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012563 /* nchars == 0: off (bash 3.2 does this too) */
Paul Fox02eb9342005-09-07 16:56:02 +000012564 break;
12565 case 's':
12566 silent = 1;
12567 break;
Ned Ludd2123b7c2005-02-09 21:07:23 +000012568#endif
Denis Vlasenko131ae172007-02-18 13:00:19 +000012569#if ENABLE_ASH_READ_TIMEOUT
Paul Fox02eb9342005-09-07 16:56:02 +000012570 case 't':
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012571 timeout = bb_strtou(optionarg, NULL, 10);
12572 if (errno || timeout > UINT_MAX / 2048)
12573 ash_msg_and_raise_error("invalid timeout");
12574 timeout *= 1000;
12575#if 0 /* even bash have no -t N.NNN support */
Denis Vlasenko037576d2007-10-20 18:30:38 +000012576 ts.tv_sec = bb_strtou(optionarg, &p, 10);
Paul Fox02eb9342005-09-07 16:56:02 +000012577 ts.tv_usec = 0;
Denis Vlasenko037576d2007-10-20 18:30:38 +000012578 /* EINVAL means number is ok, but not terminated by NUL */
12579 if (*p == '.' && errno == EINVAL) {
Paul Fox02eb9342005-09-07 16:56:02 +000012580 char *p2;
12581 if (*++p) {
12582 int scale;
Denis Vlasenko037576d2007-10-20 18:30:38 +000012583 ts.tv_usec = bb_strtou(p, &p2, 10);
12584 if (errno)
Denis Vlasenkob012b102007-02-19 22:43:01 +000012585 ash_msg_and_raise_error("invalid timeout");
Paul Fox02eb9342005-09-07 16:56:02 +000012586 scale = p2 - p;
12587 /* normalize to usec */
12588 if (scale > 6)
Denis Vlasenkob012b102007-02-19 22:43:01 +000012589 ash_msg_and_raise_error("invalid timeout");
Paul Fox02eb9342005-09-07 16:56:02 +000012590 while (scale++ < 6)
12591 ts.tv_usec *= 10;
12592 }
Denis Vlasenko037576d2007-10-20 18:30:38 +000012593 } else if (ts.tv_sec < 0 || errno) {
Denis Vlasenkob012b102007-02-19 22:43:01 +000012594 ash_msg_and_raise_error("invalid timeout");
Paul Fox02eb9342005-09-07 16:56:02 +000012595 }
Denis Vlasenko037576d2007-10-20 18:30:38 +000012596 if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
Denis Vlasenkob012b102007-02-19 22:43:01 +000012597 ash_msg_and_raise_error("invalid timeout");
Denis Vlasenko037576d2007-10-20 18:30:38 +000012598 }
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012599#endif /* if 0 */
Paul Fox02eb9342005-09-07 16:56:02 +000012600 break;
12601#endif
12602 case 'r':
12603 rflag = 1;
12604 break;
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012605 case 'u':
12606 fd = bb_strtou(optionarg, NULL, 10);
12607 if (fd < 0 || errno)
12608 ash_msg_and_raise_error("invalid file descriptor");
12609 break;
Paul Fox02eb9342005-09-07 16:56:02 +000012610 default:
12611 break;
12612 }
Eric Andersenc470f442003-07-28 09:56:35 +000012613 }
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012614 if (prompt && isatty(fd)) {
Eric Andersenc470f442003-07-28 09:56:35 +000012615 out2str(prompt);
Eric Andersenc470f442003-07-28 09:56:35 +000012616 }
Denis Vlasenko5cedb752007-02-18 19:56:41 +000012617 ap = argptr;
12618 if (*ap == NULL)
Denis Vlasenko9cd4c762008-06-18 19:22:19 +000012619 ap = (char**)arg_REPLY;
Denis Vlasenko5cedb752007-02-18 19:56:41 +000012620 ifs = bltinlookup("IFS");
12621 if (ifs == NULL)
Eric Andersenc470f442003-07-28 09:56:35 +000012622 ifs = defifs;
Denis Vlasenko131ae172007-02-18 13:00:19 +000012623#if ENABLE_ASH_READ_NCHARS
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012624 tcgetattr(fd, &tty);
12625 old_tty = tty;
12626 if (nchars || silent) {
12627 if (nchars) {
12628 tty.c_lflag &= ~ICANON;
12629 tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
Paul Fox02eb9342005-09-07 16:56:02 +000012630 }
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012631 if (silent) {
12632 tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
12633 }
12634 /* if tcgetattr failed, tcsetattr will fail too.
12635 * Ignoring, it's harmless. */
12636 tcsetattr(fd, TCSANOW, &tty);
Paul Fox02eb9342005-09-07 16:56:02 +000012637 }
12638#endif
Paul Fox02eb9342005-09-07 16:56:02 +000012639
Eric Andersenc470f442003-07-28 09:56:35 +000012640 status = 0;
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012641 startword = 2;
Eric Andersenc470f442003-07-28 09:56:35 +000012642 backslash = 0;
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012643#if ENABLE_ASH_READ_TIMEOUT
12644 if (timeout) /* NB: ensuring end_ms is nonzero */
12645 end_ms = ((unsigned)(monotonic_us() / 1000) + timeout) | 1;
12646#endif
Eric Andersenc470f442003-07-28 09:56:35 +000012647 STARTSTACKSTR(p);
Denis Vlasenko037576d2007-10-20 18:30:38 +000012648 do {
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012649 const char *is_ifs;
12650
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012651#if ENABLE_ASH_READ_TIMEOUT
12652 if (end_ms) {
12653 struct pollfd pfd[1];
12654 pfd[0].fd = fd;
12655 pfd[0].events = POLLIN;
12656 timeout = end_ms - (unsigned)(monotonic_us() / 1000);
12657 if ((int)timeout <= 0 /* already late? */
12658 || safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
12659 ) { /* timed out! */
12660#if ENABLE_ASH_READ_NCHARS
12661 tcsetattr(fd, TCSANOW, &old_tty);
12662#endif
12663 return 1;
12664 }
12665 }
12666#endif
12667 if (nonblock_safe_read(fd, &c, 1) != 1) {
Eric Andersenc470f442003-07-28 09:56:35 +000012668 status = 1;
12669 break;
12670 }
12671 if (c == '\0')
12672 continue;
12673 if (backslash) {
12674 backslash = 0;
12675 if (c != '\n')
12676 goto put;
12677 continue;
12678 }
12679 if (!rflag && c == '\\') {
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012680 backslash = 1;
Eric Andersenc470f442003-07-28 09:56:35 +000012681 continue;
12682 }
12683 if (c == '\n')
12684 break;
Denis Vlasenkof6fbd622009-03-31 19:36:58 +000012685 /* $IFS splitting */
Denis Vlasenko551ffdc2009-04-01 19:48:05 +000012686/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012687 is_ifs = strchr(ifs, c);
12688 if (startword && is_ifs) {
12689 if (isspace(c))
12690 continue;
Denis Vlasenkof6fbd622009-03-31 19:36:58 +000012691 /* it is a non-space ifs char */
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012692 startword--;
12693 if (startword == 1) /* first one? */
Denis Vlasenkof6fbd622009-03-31 19:36:58 +000012694 continue; /* yes, it is not next word yet */
Eric Andersenc470f442003-07-28 09:56:35 +000012695 }
12696 startword = 0;
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012697 if (ap[1] != NULL && is_ifs) {
12698 const char *beg;
Eric Andersenc470f442003-07-28 09:56:35 +000012699 STACKSTRNUL(p);
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012700 beg = stackblock();
12701 setvar(*ap, beg, 0);
Eric Andersenc470f442003-07-28 09:56:35 +000012702 ap++;
Denis Vlasenkof6fbd622009-03-31 19:36:58 +000012703 /* can we skip one non-space ifs char? (2: yes) */
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012704 startword = isspace(c) ? 2 : 1;
Eric Andersenc470f442003-07-28 09:56:35 +000012705 STARTSTACKSTR(p);
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012706 continue;
Eric Andersenc470f442003-07-28 09:56:35 +000012707 }
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012708 put:
12709 STPUTC(c, p);
Eric Andersenc470f442003-07-28 09:56:35 +000012710 }
Denis Vlasenko037576d2007-10-20 18:30:38 +000012711/* end of do {} while: */
Denis Vlasenko131ae172007-02-18 13:00:19 +000012712#if ENABLE_ASH_READ_NCHARS
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012713 while (--nchars);
Denis Vlasenko037576d2007-10-20 18:30:38 +000012714#else
12715 while (1);
12716#endif
12717
12718#if ENABLE_ASH_READ_NCHARS
Denis Vlasenko59f351c2008-03-25 00:07:12 +000012719 tcsetattr(fd, TCSANOW, &old_tty);
Paul Fox02eb9342005-09-07 16:56:02 +000012720#endif
12721
Eric Andersenc470f442003-07-28 09:56:35 +000012722 STACKSTRNUL(p);
Denis Vlasenko46aeab92009-03-31 19:18:17 +000012723 /* Remove trailing space ifs chars */
12724 while ((char *)stackblock() <= --p && isspace(*p) && strchr(ifs, *p) != NULL)
Eric Andersenc470f442003-07-28 09:56:35 +000012725 *p = '\0';
12726 setvar(*ap, stackblock(), 0);
12727 while (*++ap != NULL)
12728 setvar(*ap, nullstr, 0);
12729 return status;
12730}
12731
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012732static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012733umaskcmd(int argc UNUSED_PARAM, char **argv)
Eric Andersenc470f442003-07-28 09:56:35 +000012734{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000012735 static const char permuser[3] ALIGN1 = "ugo";
12736 static const char permmode[3] ALIGN1 = "rwx";
12737 static const short permmask[] ALIGN2 = {
Eric Andersenc470f442003-07-28 09:56:35 +000012738 S_IRUSR, S_IWUSR, S_IXUSR,
12739 S_IRGRP, S_IWGRP, S_IXGRP,
12740 S_IROTH, S_IWOTH, S_IXOTH
12741 };
12742
Denis Vlasenkoeb858492009-04-18 02:06:54 +000012743 /* TODO: use bb_parse_mode() instead */
12744
Eric Andersenc470f442003-07-28 09:56:35 +000012745 char *ap;
12746 mode_t mask;
12747 int i;
12748 int symbolic_mode = 0;
12749
12750 while (nextopt("S") != '\0') {
12751 symbolic_mode = 1;
12752 }
12753
Denis Vlasenkob012b102007-02-19 22:43:01 +000012754 INT_OFF;
Eric Andersenc470f442003-07-28 09:56:35 +000012755 mask = umask(0);
12756 umask(mask);
Denis Vlasenkob012b102007-02-19 22:43:01 +000012757 INT_ON;
Eric Andersenc470f442003-07-28 09:56:35 +000012758
Denis Vlasenko5cedb752007-02-18 19:56:41 +000012759 ap = *argptr;
12760 if (ap == NULL) {
Eric Andersenc470f442003-07-28 09:56:35 +000012761 if (symbolic_mode) {
12762 char buf[18];
12763 char *p = buf;
12764
12765 for (i = 0; i < 3; i++) {
12766 int j;
12767
12768 *p++ = permuser[i];
12769 *p++ = '=';
12770 for (j = 0; j < 3; j++) {
12771 if ((mask & permmask[3 * i + j]) == 0) {
12772 *p++ = permmode[j];
12773 }
12774 }
12775 *p++ = ',';
12776 }
12777 *--p = 0;
12778 puts(buf);
12779 } else {
12780 out1fmt("%.4o\n", mask);
12781 }
12782 } else {
Denis Vlasenkoaa744452007-02-23 01:04:22 +000012783 if (isdigit((unsigned char) *ap)) {
Eric Andersenc470f442003-07-28 09:56:35 +000012784 mask = 0;
12785 do {
12786 if (*ap >= '8' || *ap < '0')
Denys Vlasenkoecc2a2e2009-08-29 22:53:41 +020012787 ash_msg_and_raise_error(msg_illnum, argv[1]);
Eric Andersenc470f442003-07-28 09:56:35 +000012788 mask = (mask << 3) + (*ap - '0');
12789 } while (*++ap != '\0');
12790 umask(mask);
12791 } else {
12792 mask = ~mask & 0777;
12793 if (!bb_parse_mode(ap, &mask)) {
Denis Vlasenko3af3e5b2007-03-05 00:24:52 +000012794 ash_msg_and_raise_error("illegal mode: %s", ap);
Eric Andersenc470f442003-07-28 09:56:35 +000012795 }
12796 umask(~mask & 0777);
12797 }
12798 }
12799 return 0;
12800}
12801
12802/*
12803 * ulimit builtin
12804 *
12805 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12806 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12807 * ash by J.T. Conklin.
12808 *
12809 * Public domain.
12810 */
Eric Andersenc470f442003-07-28 09:56:35 +000012811struct limits {
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012812 uint8_t cmd; /* RLIMIT_xxx fit into it */
12813 uint8_t factor_shift; /* shift by to get rlim_{cur,max} values */
Eric Andersenc470f442003-07-28 09:56:35 +000012814 char option;
12815};
12816
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012817static const struct limits limits_tbl[] = {
Eric Andersenc470f442003-07-28 09:56:35 +000012818#ifdef RLIMIT_CPU
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012819 { RLIMIT_CPU, 0, 't' },
Eric Andersenc470f442003-07-28 09:56:35 +000012820#endif
12821#ifdef RLIMIT_FSIZE
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012822 { RLIMIT_FSIZE, 9, 'f' },
Eric Andersenc470f442003-07-28 09:56:35 +000012823#endif
12824#ifdef RLIMIT_DATA
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012825 { RLIMIT_DATA, 10, 'd' },
Eric Andersenc470f442003-07-28 09:56:35 +000012826#endif
12827#ifdef RLIMIT_STACK
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012828 { RLIMIT_STACK, 10, 's' },
Eric Andersenc470f442003-07-28 09:56:35 +000012829#endif
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012830#ifdef RLIMIT_CORE
12831 { RLIMIT_CORE, 9, 'c' },
Eric Andersenc470f442003-07-28 09:56:35 +000012832#endif
12833#ifdef RLIMIT_RSS
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012834 { RLIMIT_RSS, 10, 'm' },
Eric Andersenc470f442003-07-28 09:56:35 +000012835#endif
12836#ifdef RLIMIT_MEMLOCK
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012837 { RLIMIT_MEMLOCK, 10, 'l' },
Eric Andersenc470f442003-07-28 09:56:35 +000012838#endif
12839#ifdef RLIMIT_NPROC
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012840 { RLIMIT_NPROC, 0, 'p' },
Eric Andersenc470f442003-07-28 09:56:35 +000012841#endif
12842#ifdef RLIMIT_NOFILE
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012843 { RLIMIT_NOFILE, 0, 'n' },
Eric Andersenc470f442003-07-28 09:56:35 +000012844#endif
Glenn L McGrath76620622004-01-13 10:19:37 +000012845#ifdef RLIMIT_AS
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012846 { RLIMIT_AS, 10, 'v' },
Eric Andersenc470f442003-07-28 09:56:35 +000012847#endif
Glenn L McGrath76620622004-01-13 10:19:37 +000012848#ifdef RLIMIT_LOCKS
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012849 { RLIMIT_LOCKS, 0, 'w' },
Eric Andersenc470f442003-07-28 09:56:35 +000012850#endif
Eric Andersenc470f442003-07-28 09:56:35 +000012851};
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012852static const char limits_name[] =
12853#ifdef RLIMIT_CPU
12854 "time(seconds)" "\0"
12855#endif
12856#ifdef RLIMIT_FSIZE
12857 "file(blocks)" "\0"
12858#endif
12859#ifdef RLIMIT_DATA
12860 "data(kb)" "\0"
12861#endif
12862#ifdef RLIMIT_STACK
12863 "stack(kb)" "\0"
12864#endif
12865#ifdef RLIMIT_CORE
12866 "coredump(blocks)" "\0"
12867#endif
12868#ifdef RLIMIT_RSS
12869 "memory(kb)" "\0"
12870#endif
12871#ifdef RLIMIT_MEMLOCK
12872 "locked memory(kb)" "\0"
12873#endif
12874#ifdef RLIMIT_NPROC
12875 "process" "\0"
12876#endif
12877#ifdef RLIMIT_NOFILE
12878 "nofiles" "\0"
12879#endif
12880#ifdef RLIMIT_AS
12881 "vmemory(kb)" "\0"
12882#endif
12883#ifdef RLIMIT_LOCKS
12884 "locks" "\0"
12885#endif
12886;
Eric Andersenc470f442003-07-28 09:56:35 +000012887
Glenn L McGrath76620622004-01-13 10:19:37 +000012888enum limtype { SOFT = 0x1, HARD = 0x2 };
12889
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +000012890static void
12891printlim(enum limtype how, const struct rlimit *limit,
Glenn L McGrath76620622004-01-13 10:19:37 +000012892 const struct limits *l)
12893{
12894 rlim_t val;
12895
12896 val = limit->rlim_max;
12897 if (how & SOFT)
12898 val = limit->rlim_cur;
12899
12900 if (val == RLIM_INFINITY)
12901 out1fmt("unlimited\n");
12902 else {
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012903 val >>= l->factor_shift;
Glenn L McGrath76620622004-01-13 10:19:37 +000012904 out1fmt("%lld\n", (long long) val);
12905 }
12906}
12907
Denys Vlasenkod5f1b1b2009-06-05 12:06:05 +020012908static int FAST_FUNC
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000012909ulimitcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
Eric Andersenc470f442003-07-28 09:56:35 +000012910{
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +000012911 int c;
Eric Andersenc470f442003-07-28 09:56:35 +000012912 rlim_t val = 0;
Glenn L McGrath76620622004-01-13 10:19:37 +000012913 enum limtype how = SOFT | HARD;
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +000012914 const struct limits *l;
12915 int set, all = 0;
12916 int optc, what;
12917 struct rlimit limit;
Eric Andersenc470f442003-07-28 09:56:35 +000012918
12919 what = 'f';
Glenn L McGrath16e45d72004-02-04 08:24:39 +000012920 while ((optc = nextopt("HSa"
12921#ifdef RLIMIT_CPU
12922 "t"
12923#endif
12924#ifdef RLIMIT_FSIZE
12925 "f"
12926#endif
12927#ifdef RLIMIT_DATA
12928 "d"
12929#endif
12930#ifdef RLIMIT_STACK
12931 "s"
12932#endif
12933#ifdef RLIMIT_CORE
12934 "c"
12935#endif
12936#ifdef RLIMIT_RSS
12937 "m"
12938#endif
12939#ifdef RLIMIT_MEMLOCK
12940 "l"
12941#endif
12942#ifdef RLIMIT_NPROC
12943 "p"
12944#endif
12945#ifdef RLIMIT_NOFILE
12946 "n"
12947#endif
12948#ifdef RLIMIT_AS
12949 "v"
12950#endif
12951#ifdef RLIMIT_LOCKS
12952 "w"
12953#endif
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000012954 )) != '\0')
Eric Andersenc470f442003-07-28 09:56:35 +000012955 switch (optc) {
12956 case 'H':
12957 how = HARD;
12958 break;
12959 case 'S':
12960 how = SOFT;
12961 break;
12962 case 'a':
12963 all = 1;
12964 break;
12965 default:
12966 what = optc;
12967 }
12968
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012969 for (l = limits_tbl; l->option != what; l++)
12970 continue;
Eric Andersenc470f442003-07-28 09:56:35 +000012971
12972 set = *argptr ? 1 : 0;
12973 if (set) {
12974 char *p = *argptr;
12975
12976 if (all || argptr[1])
Denis Vlasenkob012b102007-02-19 22:43:01 +000012977 ash_msg_and_raise_error("too many arguments");
Eric Andersen81fe1232003-07-29 06:38:40 +000012978 if (strncmp(p, "unlimited\n", 9) == 0)
Eric Andersenc470f442003-07-28 09:56:35 +000012979 val = RLIM_INFINITY;
12980 else {
12981 val = (rlim_t) 0;
12982
Denis Vlasenkoa0f82e92007-02-18 12:35:30 +000012983 while ((c = *p++) >= '0' && c <= '9') {
Eric Andersenc470f442003-07-28 09:56:35 +000012984 val = (val * 10) + (long)(c - '0');
Denis Vlasenko6b06cb82008-05-15 21:30:45 +000012985 // val is actually 'unsigned long int' and can't get < 0
Eric Andersenc470f442003-07-28 09:56:35 +000012986 if (val < (rlim_t) 0)
12987 break;
12988 }
12989 if (c)
Denis Vlasenkob012b102007-02-19 22:43:01 +000012990 ash_msg_and_raise_error("bad number");
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012991 val <<= l->factor_shift;
Eric Andersenc470f442003-07-28 09:56:35 +000012992 }
12993 }
12994 if (all) {
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012995 const char *lname = limits_name;
12996 for (l = limits_tbl; l != &limits_tbl[ARRAY_SIZE(limits_tbl)]; l++) {
Eric Andersenc470f442003-07-28 09:56:35 +000012997 getrlimit(l->cmd, &limit);
Denis Vlasenkoa59f4352007-10-29 19:17:29 +000012998 out1fmt("%-20s ", lname);
12999 lname += strlen(lname) + 1;
Glenn L McGrath76620622004-01-13 10:19:37 +000013000 printlim(how, &limit, l);
Eric Andersenc470f442003-07-28 09:56:35 +000013001 }
13002 return 0;
13003 }
13004
13005 getrlimit(l->cmd, &limit);
13006 if (set) {
13007 if (how & HARD)
13008 limit.rlim_max = val;
13009 if (how & SOFT)
13010 limit.rlim_cur = val;
13011 if (setrlimit(l->cmd, &limit) < 0)
Denis Vlasenkob012b102007-02-19 22:43:01 +000013012 ash_msg_and_raise_error("error setting limit (%m)");
Eric Andersenc470f442003-07-28 09:56:35 +000013013 } else {
Glenn L McGrath76620622004-01-13 10:19:37 +000013014 printlim(how, &limit, l);
Eric Andersenc470f442003-07-28 09:56:35 +000013015 }
13016 return 0;
13017}
13018
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000013019/* ============ main() and helpers */
13020
13021/*
13022 * Called to exit the shell.
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013023 */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000013024static void exitshell(void) NORETURN;
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000013025static void
13026exitshell(void)
13027{
13028 struct jmploc loc;
13029 char *p;
13030 int status;
13031
13032 status = exitstatus;
13033 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
13034 if (setjmp(loc.loc)) {
Denis Vlasenko7f88e342009-03-19 03:36:18 +000013035 if (exception_type == EXEXIT)
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000013036/* dash bug: it just does _exit(exitstatus) here
13037 * but we have to do setjobctl(0) first!
13038 * (bug is still not fixed in dash-0.5.3 - if you run dash
13039 * under Midnight Commander, on exit from dash MC is backgrounded) */
13040 status = exitstatus;
13041 goto out;
13042 }
13043 exception_handler = &loc;
13044 p = trap[0];
13045 if (p) {
13046 trap[0] = NULL;
13047 evalstring(p, 0);
Denys Vlasenko0800e3a2009-09-24 03:09:26 +020013048 free(p);
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000013049 }
13050 flush_stdout_stderr();
13051 out:
13052 setjobctl(0);
13053 _exit(status);
13054 /* NOTREACHED */
13055}
13056
Denis Vlasenko5c67e3e2007-02-23 01:05:03 +000013057static void
13058init(void)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013059{
13060 /* from input.c: */
Denis Vlasenko41eb3002008-11-28 03:42:31 +000013061 basepf.next_to_pgetc = basepf.buf = basebuf;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013062
13063 /* from trap.c: */
13064 signal(SIGCHLD, SIG_DFL);
13065
13066 /* from var.c: */
13067 {
13068 char **envp;
Denys Vlasenko6db47842009-09-05 20:15:17 +020013069 char ppid[sizeof(int)*3 + 2];
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013070 const char *p;
13071 struct stat st1, st2;
13072
13073 initvar();
13074 for (envp = environ; envp && *envp; envp++) {
13075 if (strchr(*envp, '=')) {
13076 setvareq(*envp, VEXPORT|VTEXTFIXED);
13077 }
13078 }
13079
Denys Vlasenko6db47842009-09-05 20:15:17 +020013080 sprintf(ppid, "%u", (unsigned) getppid());
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013081 setvar("PPID", ppid, 0);
13082
13083 p = lookupvar("PWD");
13084 if (p)
13085 if (*p != '/' || stat(p, &st1) || stat(".", &st2)
13086 || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
13087 p = '\0';
13088 setpwd(p, 0);
13089 }
13090}
13091
13092/*
13093 * Process the shell command line arguments.
13094 */
13095static void
Denis Vlasenko68404f12008-03-17 09:00:54 +000013096procargs(char **argv)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013097{
13098 int i;
13099 const char *xminusc;
13100 char **xargv;
13101
13102 xargv = argv;
13103 arg0 = xargv[0];
Denis Vlasenko68404f12008-03-17 09:00:54 +000013104 /* if (xargv[0]) - mmm, this is always true! */
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013105 xargv++;
13106 for (i = 0; i < NOPTS; i++)
13107 optlist[i] = 2;
13108 argptr = xargv;
Denis Vlasenko28bf6712008-02-14 15:01:47 +000013109 if (options(1)) {
13110 /* it already printed err message */
13111 raise_exception(EXERROR);
13112 }
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013113 xargv = argptr;
13114 xminusc = minusc;
13115 if (*xargv == NULL) {
13116 if (xminusc)
13117 ash_msg_and_raise_error(bb_msg_requires_arg, "-c");
13118 sflag = 1;
13119 }
13120 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
13121 iflag = 1;
13122 if (mflag == 2)
13123 mflag = iflag;
13124 for (i = 0; i < NOPTS; i++)
13125 if (optlist[i] == 2)
13126 optlist[i] = 0;
13127#if DEBUG == 2
13128 debug = 1;
13129#endif
13130 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
13131 if (xminusc) {
13132 minusc = *xargv++;
13133 if (*xargv)
13134 goto setarg0;
13135 } else if (!sflag) {
13136 setinputfile(*xargv, 0);
13137 setarg0:
13138 arg0 = *xargv++;
13139 commandname = arg0;
13140 }
13141
13142 shellparam.p = xargv;
13143#if ENABLE_ASH_GETOPTS
13144 shellparam.optind = 1;
13145 shellparam.optoff = -1;
13146#endif
Denis Vlasenko01631112007-12-16 17:20:38 +000013147 /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013148 while (*xargv) {
13149 shellparam.nparam++;
13150 xargv++;
13151 }
13152 optschanged();
13153}
13154
13155/*
13156 * Read /etc/profile or .profile.
13157 */
13158static void
13159read_profile(const char *name)
13160{
13161 int skip;
13162
13163 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
13164 return;
13165 skip = cmdloop(0);
13166 popfile();
13167 if (skip)
13168 exitshell();
13169}
13170
Denis Vlasenko0c032a42007-02-23 01:03:40 +000013171/*
13172 * This routine is called when an error or an interrupt occurs in an
13173 * interactive shell and control is returned to the main command loop.
13174 */
13175static void
13176reset(void)
13177{
13178 /* from eval.c: */
13179 evalskip = 0;
13180 loopnest = 0;
13181 /* from input.c: */
Denis Vlasenko41eb3002008-11-28 03:42:31 +000013182 g_parsefile->left_in_buffer = 0;
13183 g_parsefile->left_in_line = 0; /* clear input buffer */
Denis Vlasenko0c032a42007-02-23 01:03:40 +000013184 popallfiles();
13185 /* from parser.c: */
13186 tokpushback = 0;
13187 checkkwd = 0;
13188 /* from redir.c: */
Denis Vlasenko34c73c42008-08-16 11:48:02 +000013189 clearredir(/*drop:*/ 0);
Denis Vlasenko0c032a42007-02-23 01:03:40 +000013190}
13191
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013192#if PROFILE
13193static short profile_buf[16384];
13194extern int etext();
13195#endif
13196
Denis Vlasenkobc54cff2007-02-23 01:05:52 +000013197/*
13198 * Main routine. We initialize things, parse the arguments, execute
13199 * profiles if we're a login shell, and then call cmdloop to execute
13200 * commands. The setjmp call sets up the location to jump to when an
13201 * exception occurs. When an exception occurs the variable "state"
13202 * is used to figure out how far we had gotten.
13203 */
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000013204int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +000013205int ash_main(int argc UNUSED_PARAM, char **argv)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013206{
Mike Frysinger98c52642009-04-02 10:02:37 +000013207 const char *shinit;
Denis Vlasenko4e12b1a2008-12-23 23:36:47 +000013208 volatile smallint state;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013209 struct jmploc jmploc;
13210 struct stackmark smark;
13211
Denis Vlasenko01631112007-12-16 17:20:38 +000013212 /* Initialize global data */
13213 INIT_G_misc();
13214 INIT_G_memstack();
13215 INIT_G_var();
Denis Vlasenkoee87ebf2007-12-21 22:18:16 +000013216#if ENABLE_ASH_ALIAS
Denis Vlasenko01631112007-12-16 17:20:38 +000013217 INIT_G_alias();
Denis Vlasenkoee87ebf2007-12-21 22:18:16 +000013218#endif
Denis Vlasenko01631112007-12-16 17:20:38 +000013219 INIT_G_cmdtable();
13220
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013221#if PROFILE
13222 monitor(4, etext, profile_buf, sizeof(profile_buf), 50);
13223#endif
13224
13225#if ENABLE_FEATURE_EDITING
13226 line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP);
13227#endif
13228 state = 0;
13229 if (setjmp(jmploc.loc)) {
Denis Vlasenko7f88e342009-03-19 03:36:18 +000013230 smallint e;
Denis Vlasenko4e12b1a2008-12-23 23:36:47 +000013231 smallint s;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013232
13233 reset();
13234
Denis Vlasenko7f88e342009-03-19 03:36:18 +000013235 e = exception_type;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013236 if (e == EXERROR)
13237 exitstatus = 2;
13238 s = state;
13239 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
13240 exitshell();
Denis Vlasenko7f88e342009-03-19 03:36:18 +000013241 if (e == EXINT)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013242 outcslow('\n', stderr);
Denis Vlasenko7f88e342009-03-19 03:36:18 +000013243
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013244 popstackmark(&smark);
13245 FORCE_INT_ON; /* enable interrupts */
13246 if (s == 1)
13247 goto state1;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +000013248 if (s == 2)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013249 goto state2;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +000013250 if (s == 3)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013251 goto state3;
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +000013252 goto state4;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013253 }
13254 exception_handler = &jmploc;
13255#if DEBUG
13256 opentrace();
Denis Vlasenko653d8e72009-03-19 21:59:35 +000013257 TRACE(("Shell args: "));
Denis Vlasenkofe1f00a2007-02-23 01:04:50 +000013258 trace_puts_args(argv);
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013259#endif
13260 rootpid = getpid();
13261
13262#if ENABLE_ASH_RANDOM_SUPPORT
Denis Vlasenkoce13b762008-06-29 02:25:53 +000013263 /* Can use monotonic_ns() for better randomness but for now it is
13264 * not used anywhere else in busybox... so avoid bloat */
13265 random_galois_LFSR = random_LCG = rootpid + monotonic_us();
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013266#endif
13267 init();
13268 setstackmark(&smark);
Denis Vlasenko68404f12008-03-17 09:00:54 +000013269 procargs(argv);
13270
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013271#if ENABLE_FEATURE_EDITING_SAVEHISTORY
13272 if (iflag) {
13273 const char *hp = lookupvar("HISTFILE");
13274
13275 if (hp == NULL) {
13276 hp = lookupvar("HOME");
13277 if (hp != NULL) {
13278 char *defhp = concat_path_file(hp, ".ash_history");
13279 setvar("HISTFILE", defhp, 0);
13280 free(defhp);
13281 }
13282 }
13283 }
13284#endif
Denis Vlasenko4e12b1a2008-12-23 23:36:47 +000013285 if (/* argv[0] && */ argv[0][0] == '-')
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013286 isloginsh = 1;
13287 if (isloginsh) {
13288 state = 1;
13289 read_profile("/etc/profile");
13290 state1:
13291 state = 2;
13292 read_profile(".profile");
13293 }
13294 state2:
13295 state = 3;
13296 if (
13297#ifndef linux
Denis Vlasenko0c032a42007-02-23 01:03:40 +000013298 getuid() == geteuid() && getgid() == getegid() &&
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013299#endif
Denis Vlasenko0c032a42007-02-23 01:03:40 +000013300 iflag
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013301 ) {
13302 shinit = lookupvar("ENV");
13303 if (shinit != NULL && *shinit != '\0') {
13304 read_profile(shinit);
13305 }
13306 }
13307 state3:
13308 state = 4;
Denis Vlasenko5c2b8142009-03-19 01:59:59 +000013309 if (minusc) {
13310 /* evalstring pushes parsefile stack.
13311 * Ensure we don't falsely claim that 0 (stdin)
Denis Vlasenko5368ad52009-03-20 10:20:08 +000013312 * is one of stacked source fds.
13313 * Testcase: ash -c 'exec 1>&0' must not complain. */
Denis Vlasenko5c2b8142009-03-19 01:59:59 +000013314 if (!sflag)
13315 g_parsefile->fd = -1;
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013316 evalstring(minusc, 0);
Denis Vlasenko5c2b8142009-03-19 01:59:59 +000013317 }
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013318
13319 if (sflag || minusc == NULL) {
Denys Vlasenkodb9c57e2009-09-27 02:48:53 +020013320#if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
Denis Vlasenko2f5d0cd2008-06-23 13:24:19 +000013321 if (iflag) {
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013322 const char *hp = lookupvar("HISTFILE");
Denis Vlasenko5c2b8142009-03-19 01:59:59 +000013323 if (hp)
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013324 line_input_state->hist_file = hp;
13325 }
13326#endif
13327 state4: /* XXX ??? - why isn't this before the "if" statement */
13328 cmdloop(1);
13329 }
13330#if PROFILE
13331 monitor(0);
13332#endif
13333#ifdef GPROF
13334 {
13335 extern void _mcleanup(void);
13336 _mcleanup();
13337 }
13338#endif
13339 exitshell();
13340 /* NOTREACHED */
13341}
13342
Denis Vlasenkoa624c112007-02-19 22:45:43 +000013343
Eric Andersendf82f612001-06-28 07:46:40 +000013344/*-
13345 * Copyright (c) 1989, 1991, 1993, 1994
Eric Andersen2870d962001-07-02 17:27:21 +000013346 * The Regents of the University of California. All rights reserved.
Eric Andersendf82f612001-06-28 07:46:40 +000013347 *
13348 * This code is derived from software contributed to Berkeley by
13349 * Kenneth Almquist.
13350 *
13351 * Redistribution and use in source and binary forms, with or without
13352 * modification, are permitted provided that the following conditions
13353 * are met:
13354 * 1. Redistributions of source code must retain the above copyright
13355 * notice, this list of conditions and the following disclaimer.
13356 * 2. Redistributions in binary form must reproduce the above copyright
13357 * notice, this list of conditions and the following disclaimer in the
13358 * documentation and/or other materials provided with the distribution.
"Vladimir N. Oleynik"ddc280e2005-12-15 12:01:49 +000013359 * 3. Neither the name of the University nor the names of its contributors
Eric Andersendf82f612001-06-28 07:46:40 +000013360 * may be used to endorse or promote products derived from this software
13361 * without specific prior written permission.
13362 *
13363 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13364 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13365 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13366 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13367 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13368 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13369 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13370 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13371 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13372 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
13373 * SUCH DAMAGE.
13374 */