blob: 85a603071f15835258341594e26200d6f3d329a1 [file] [log] [blame]
wdenkfe8c2802002-11-03 00:38:21 +00001/*
2 * sh.c -- a prototype Bourne shell grammar parser
3 * Intended to follow the original Thompson and Ritchie
4 * "small and simple is beautiful" philosophy, which
5 * incidentally is a good match to today's BusyBox.
6 *
7 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
8 *
9 * Credits:
10 * The parser routines proper are all original material, first
11 * written Dec 2000 and Jan 2001 by Larry Doolittle.
12 * The execution engine, the builtins, and much of the underlying
13 * support has been adapted from busybox-0.49pre's lash,
14 * which is Copyright (C) 2000 by Lineo, Inc., and
15 * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
16 * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
17 * Erik W. Troan, which they placed in the public domain. I don't know
18 * how much of the Johnson/Troan code has survived the repeated rewrites.
19 * Other credits:
20 * simple_itoa() was lifted from boa-0.93.15
21 * b_addchr() derived from similar w_addchar function in glibc-2.2
22 * setup_redirect(), redirect_opt_num(), and big chunks of main()
23 * and many builtins derived from contributions by Erik Andersen
24 * miscellaneous bugfixes from Matt Kraai
25 *
26 * There are two big (and related) architecture differences between
27 * this parser and the lash parser. One is that this version is
28 * actually designed from the ground up to understand nearly all
29 * of the Bourne grammar. The second, consequential change is that
30 * the parser and input reader have been turned inside out. Now,
31 * the parser is in control, and asks for input as needed. The old
32 * way had the input reader in control, and it asked for parsing to
33 * take place as needed. The new way makes it much easier to properly
34 * handle the recursion implicit in the various substitutions, especially
35 * across continuation lines.
36 *
37 * Bash grammar not implemented: (how many of these were in original sh?)
38 * $@ (those sure look like weird quoting rules)
39 * $_
40 * ! negation operator for pipes
41 * &> and >& redirection of stdout+stderr
42 * Brace Expansion
43 * Tilde Expansion
44 * fancy forms of Parameter Expansion
45 * aliases
46 * Arithmetic Expansion
47 * <(list) and >(list) Process Substitution
48 * reserved words: case, esac, select, function
49 * Here Documents ( << word )
50 * Functions
51 * Major bugs:
52 * job handling woefully incomplete and buggy
53 * reserved word execution woefully incomplete and buggy
54 * to-do:
55 * port selected bugfixes from post-0.49 busybox lash - done?
56 * finish implementing reserved words: for, while, until, do, done
57 * change { and } from special chars to reserved words
58 * builtins: break, continue, eval, return, set, trap, ulimit
59 * test magic exec
60 * handle children going into background
61 * clean up recognition of null pipes
62 * check setting of global_argc and global_argv
63 * control-C handling, probably with longjmp
64 * follow IFS rules more precisely, including update semantics
65 * figure out what to do with backslash-newline
66 * explain why we use signal instead of sigaction
67 * propagate syntax errors, die on resource errors?
68 * continuation lines, both explicit and implicit - done?
69 * memory leak finding and plugging - done?
70 * more testing, especially quoting rules and redirection
71 * document how quoting rules not precisely followed for variable assignments
72 * maybe change map[] to use 2-bit entries
73 * (eventually) remove all the printf's
74 *
75 * This program is free software; you can redistribute it and/or modify
76 * it under the terms of the GNU General Public License as published by
77 * the Free Software Foundation; either version 2 of the License, or
78 * (at your option) any later version.
79 *
80 * This program is distributed in the hope that it will be useful,
81 * but WITHOUT ANY WARRANTY; without even the implied warranty of
82 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
83 * General Public License for more details.
84 *
85 * You should have received a copy of the GNU General Public License
86 * along with this program; if not, write to the Free Software
87 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
88 */
89#define __U_BOOT__
90#ifdef __U_BOOT__
91#include <malloc.h> /* malloc, free, realloc*/
92#include <linux/ctype.h> /* isalpha, isdigit */
93#include <common.h> /* readline */
94#include <hush.h>
95#include <command.h> /* find_cmd */
wdenkfe8c2802002-11-03 00:38:21 +000096#endif
wdenkfe8c2802002-11-03 00:38:21 +000097#ifndef __U_BOOT__
98#include <ctype.h> /* isalpha, isdigit */
99#include <unistd.h> /* getpid */
100#include <stdlib.h> /* getenv, atoi */
101#include <string.h> /* strchr */
102#include <stdio.h> /* popen etc. */
103#include <glob.h> /* glob, of course */
104#include <stdarg.h> /* va_list */
105#include <errno.h>
106#include <fcntl.h>
107#include <getopt.h> /* should be pretty obvious */
108
109#include <sys/stat.h> /* ulimit */
110#include <sys/types.h>
111#include <sys/wait.h>
112#include <signal.h>
113
114/* #include <dmalloc.h> */
wdenkfe8c2802002-11-03 00:38:21 +0000115
wdenkd0fb80c2003-01-11 09:48:40 +0000116#if 1
wdenkfe8c2802002-11-03 00:38:21 +0000117#include "busybox.h"
118#include "cmdedit.h"
119#else
120#define applet_name "hush"
121#include "standalone.h"
122#define hush_main main
wdenkd0fb80c2003-01-11 09:48:40 +0000123#undef CONFIG_FEATURE_SH_FANCY_PROMPT
124#define BB_BANNER
wdenkfe8c2802002-11-03 00:38:21 +0000125#endif
126#endif
127#define SPECIAL_VAR_SYMBOL 03
128#ifndef __U_BOOT__
129#define FLAG_EXIT_FROM_LOOP 1
130#define FLAG_PARSE_SEMICOLON (1 << 1) /* symbol ';' is special for parser */
131#define FLAG_REPARSING (1 << 2) /* >= 2nd pass */
132
133#endif
134
135#ifdef __U_BOOT__
Wolfgang Denkd87080b2006-03-31 18:32:53 +0200136DECLARE_GLOBAL_DATA_PTR;
137
wdenkfe8c2802002-11-03 00:38:21 +0000138#define EXIT_SUCCESS 0
139#define EOF -1
140#define syntax() syntax_err()
141#define xstrdup strdup
142#define error_msg printf
143#else
144typedef enum {
145 REDIRECT_INPUT = 1,
146 REDIRECT_OVERWRITE = 2,
147 REDIRECT_APPEND = 3,
148 REDIRECT_HEREIS = 4,
149 REDIRECT_IO = 5
150} redir_type;
151
152/* The descrip member of this structure is only used to make debugging
153 * output pretty */
154struct {int mode; int default_fd; char *descrip;} redir_table[] = {
155 { 0, 0, "()" },
156 { O_RDONLY, 0, "<" },
157 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
158 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
159 { O_RDONLY, -1, "<<" },
160 { O_RDWR, 1, "<>" }
161};
162#endif
163
164typedef enum {
165 PIPE_SEQ = 1,
166 PIPE_AND = 2,
167 PIPE_OR = 3,
168 PIPE_BG = 4,
169} pipe_style;
170
171/* might eventually control execution */
172typedef enum {
173 RES_NONE = 0,
174 RES_IF = 1,
175 RES_THEN = 2,
176 RES_ELIF = 3,
177 RES_ELSE = 4,
178 RES_FI = 5,
179 RES_FOR = 6,
180 RES_WHILE = 7,
181 RES_UNTIL = 8,
182 RES_DO = 9,
183 RES_DONE = 10,
184 RES_XXXX = 11,
185 RES_IN = 12,
186 RES_SNTX = 13
187} reserved_style;
188#define FLAG_END (1<<RES_NONE)
189#define FLAG_IF (1<<RES_IF)
190#define FLAG_THEN (1<<RES_THEN)
191#define FLAG_ELIF (1<<RES_ELIF)
192#define FLAG_ELSE (1<<RES_ELSE)
193#define FLAG_FI (1<<RES_FI)
194#define FLAG_FOR (1<<RES_FOR)
195#define FLAG_WHILE (1<<RES_WHILE)
196#define FLAG_UNTIL (1<<RES_UNTIL)
197#define FLAG_DO (1<<RES_DO)
198#define FLAG_DONE (1<<RES_DONE)
199#define FLAG_IN (1<<RES_IN)
200#define FLAG_START (1<<RES_XXXX)
201
202/* This holds pointers to the various results of parsing */
203struct p_context {
204 struct child_prog *child;
205 struct pipe *list_head;
206 struct pipe *pipe;
207#ifndef __U_BOOT__
208 struct redir_struct *pending_redirect;
209#endif
210 reserved_style w;
211 int old_flag; /* for figuring out valid reserved words */
212 struct p_context *stack;
213 int type; /* define type of parser : ";$" common or special symbol */
214 /* How about quoting status? */
215};
216
217#ifndef __U_BOOT__
218struct redir_struct {
219 redir_type type; /* type of redirection */
220 int fd; /* file descriptor being redirected */
221 int dup; /* -1, or file descriptor being duplicated */
222 struct redir_struct *next; /* pointer to the next redirect in the list */
223 glob_t word; /* *word.gl_pathv is the filename */
224};
225#endif
226
227struct child_prog {
228#ifndef __U_BOOT__
229 pid_t pid; /* 0 if exited */
230#endif
231 char **argv; /* program name and arguments */
232#ifdef __U_BOOT__
233 int argc; /* number of program arguments */
234#endif
235 struct pipe *group; /* if non-NULL, first in group or subshell */
236#ifndef __U_BOOT__
237 int subshell; /* flag, non-zero if group must be forked */
238 struct redir_struct *redirects; /* I/O redirections */
239 glob_t glob_result; /* result of parameter globbing */
240 int is_stopped; /* is the program currently running? */
241 struct pipe *family; /* pointer back to the child's parent pipe */
242#endif
243 int sp; /* number of SPECIAL_VAR_SYMBOL */
244 int type;
245};
246
247struct pipe {
248#ifndef __U_BOOT__
249 int jobid; /* job number */
250#endif
251 int num_progs; /* total number of programs in job */
252#ifndef __U_BOOT__
253 int running_progs; /* number of programs running */
254 char *text; /* name of job */
255 char *cmdbuf; /* buffer various argv's point into */
256 pid_t pgrp; /* process group ID for the job */
257#endif
258 struct child_prog *progs; /* array of commands in pipe */
259 struct pipe *next; /* to track background commands */
260#ifndef __U_BOOT__
261 int stopped_progs; /* number of programs alive, but stopped */
262 int job_context; /* bitmask defining current context */
263#endif
264 pipe_style followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
265 reserved_style r_mode; /* supports if, for, while, until */
266};
267
268#ifndef __U_BOOT__
269struct close_me {
270 int fd;
271 struct close_me *next;
272};
273#endif
274
275struct variables {
276 char *name;
277 char *value;
278 int flg_export;
279 int flg_read_only;
280 struct variables *next;
281};
282
283/* globals, connect us to the outside world
284 * the first three support $?, $#, and $1 */
285#ifndef __U_BOOT__
286char **global_argv;
287unsigned int global_argc;
288#endif
289unsigned int last_return_code;
wdenkc26e4542004-04-18 10:13:26 +0000290int nesting_level;
wdenkfe8c2802002-11-03 00:38:21 +0000291#ifndef __U_BOOT__
292extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
293#endif
294
295/* "globals" within this file */
Wolfgang Denk77ddac92005-10-13 16:45:02 +0200296static uchar *ifs;
wdenkfe8c2802002-11-03 00:38:21 +0000297static char map[256];
298#ifndef __U_BOOT__
299static int fake_mode;
300static int interactive;
301static struct close_me *close_me_head;
302static const char *cwd;
303static struct pipe *job_list;
304static unsigned int last_bg_pid;
305static unsigned int last_jobid;
306static unsigned int shell_terminal;
307static char *PS1;
308static char *PS2;
309struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
310struct variables *top_vars = &shell_ver;
311#else
312static int flag_repeat = 0;
313static int do_repeat = 0;
wdenk2d5b5612003-10-14 19:43:55 +0000314static struct variables *top_vars = NULL ;
wdenkfe8c2802002-11-03 00:38:21 +0000315#endif /*__U_BOOT__ */
316
317#define B_CHUNK (100)
318#define B_NOSPAC 1
319
320typedef struct {
321 char *data;
322 int length;
323 int maxlen;
324 int quote;
325 int nonnull;
326} o_string;
327#define NULL_O_STRING {NULL,0,0,0,0}
328/* used for initialization:
329 o_string foo = NULL_O_STRING; */
330
331/* I can almost use ordinary FILE *. Is open_memstream() universally
332 * available? Where is it documented? */
333struct in_str {
334 const char *p;
335#ifndef __U_BOOT__
336 char peek_buf[2];
337#endif
338 int __promptme;
339 int promptmode;
340#ifndef __U_BOOT__
341 FILE *file;
342#endif
343 int (*get) (struct in_str *);
344 int (*peek) (struct in_str *);
345};
346#define b_getch(input) ((input)->get(input))
347#define b_peek(input) ((input)->peek(input))
348
349#ifndef __U_BOOT__
350#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
351
352struct built_in_command {
353 char *cmd; /* name */
354 char *descr; /* description */
355 int (*function) (struct child_prog *); /* function ptr */
356};
357#endif
358
Stefan Roese4cacf7c2008-08-19 14:57:55 +0200359/* define DEBUG_SHELL for debugging output (obviously ;-)) */
360#if 0
361#define DEBUG_SHELL
362#endif
363
wdenkfe8c2802002-11-03 00:38:21 +0000364/* This should be in utility.c */
365#ifdef DEBUG_SHELL
366#ifndef __U_BOOT__
367static void debug_printf(const char *format, ...)
368{
369 va_list args;
370 va_start(args, format);
371 vfprintf(stderr, format, args);
372 va_end(args);
373}
374#else
Stefan Roese4cacf7c2008-08-19 14:57:55 +0200375#define debug_printf(fmt,args...) printf (fmt ,##args)
wdenkfe8c2802002-11-03 00:38:21 +0000376#endif
377#else
378static inline void debug_printf(const char *format, ...) { }
379#endif
380#define final_printf debug_printf
381
382#ifdef __U_BOOT__
383static void syntax_err(void) {
384 printf("syntax error\n");
385}
386#else
387static void __syntax(char *file, int line) {
388 error_msg("syntax error %s:%d", file, line);
389}
390#define syntax() __syntax(__FILE__, __LINE__)
391#endif
392
393#ifdef __U_BOOT__
394static void *xmalloc(size_t size);
395static void *xrealloc(void *ptr, size_t size);
396#else
397/* Index of subroutines: */
398/* function prototypes for builtins */
399static int builtin_cd(struct child_prog *child);
400static int builtin_env(struct child_prog *child);
401static int builtin_eval(struct child_prog *child);
402static int builtin_exec(struct child_prog *child);
403static int builtin_exit(struct child_prog *child);
404static int builtin_export(struct child_prog *child);
405static int builtin_fg_bg(struct child_prog *child);
406static int builtin_help(struct child_prog *child);
407static int builtin_jobs(struct child_prog *child);
408static int builtin_pwd(struct child_prog *child);
409static int builtin_read(struct child_prog *child);
410static int builtin_set(struct child_prog *child);
411static int builtin_shift(struct child_prog *child);
412static int builtin_source(struct child_prog *child);
413static int builtin_umask(struct child_prog *child);
414static int builtin_unset(struct child_prog *child);
415static int builtin_not_written(struct child_prog *child);
416#endif
417/* o_string manipulation: */
418static int b_check_space(o_string *o, int len);
419static int b_addchr(o_string *o, int ch);
420static void b_reset(o_string *o);
421static int b_addqchr(o_string *o, int ch, int quote);
wdenkc26e4542004-04-18 10:13:26 +0000422#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000423static int b_adduint(o_string *o, unsigned int i);
wdenkc26e4542004-04-18 10:13:26 +0000424#endif
wdenkfe8c2802002-11-03 00:38:21 +0000425/* in_str manipulations: */
426static int static_get(struct in_str *i);
427static int static_peek(struct in_str *i);
428static int file_get(struct in_str *i);
429static int file_peek(struct in_str *i);
430#ifndef __U_BOOT__
431static void setup_file_in_str(struct in_str *i, FILE *f);
432#else
433static void setup_file_in_str(struct in_str *i);
434#endif
435static void setup_string_in_str(struct in_str *i, const char *s);
436#ifndef __U_BOOT__
437/* close_me manipulations: */
438static void mark_open(int fd);
439static void mark_closed(int fd);
wdenkd0fb80c2003-01-11 09:48:40 +0000440static void close_all(void);
wdenkfe8c2802002-11-03 00:38:21 +0000441#endif
442/* "run" the final data structures: */
443static char *indenter(int i);
444static int free_pipe_list(struct pipe *head, int indent);
445static int free_pipe(struct pipe *pi, int indent);
446/* really run the final data structures: */
447#ifndef __U_BOOT__
448static int setup_redirects(struct child_prog *prog, int squirrel[]);
449#endif
450static int run_list_real(struct pipe *pi);
451#ifndef __U_BOOT__
452static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
453#endif
454static int run_pipe_real(struct pipe *pi);
455/* extended glob support: */
456#ifndef __U_BOOT__
457static int globhack(const char *src, int flags, glob_t *pglob);
458static int glob_needed(const char *s);
459static int xglob(o_string *dest, int flags, glob_t *pglob);
460#endif
461/* variable assignment: */
462static int is_assignment(const char *s);
463/* data structure manipulation: */
464#ifndef __U_BOOT__
465static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
466#endif
467static void initialize_context(struct p_context *ctx);
468static int done_word(o_string *dest, struct p_context *ctx);
469static int done_command(struct p_context *ctx);
470static int done_pipe(struct p_context *ctx, pipe_style type);
471/* primary string parsing: */
472#ifndef __U_BOOT__
473static int redirect_dup_num(struct in_str *input);
474static int redirect_opt_num(o_string *o);
475static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
476static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
477#endif
478static char *lookup_param(char *src);
479static char *make_string(char **inp);
480static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
481#ifndef __U_BOOT__
482static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
483#endif
484static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
485/* setup: */
486static int parse_stream_outer(struct in_str *inp, int flag);
487#ifndef __U_BOOT__
488static int parse_string_outer(const char *s, int flag);
489static int parse_file_outer(FILE *f);
490#endif
491#ifndef __U_BOOT__
492/* job management: */
493static int checkjobs(struct pipe* fg_pipe);
494static void insert_bg_job(struct pipe *pi);
495static void remove_bg_job(struct pipe *pi);
496#endif
497/* local variable support */
498static char **make_list_in(char **inp, char *name);
499static char *insert_var_value(char *inp);
wdenkfe8c2802002-11-03 00:38:21 +0000500
501#ifndef __U_BOOT__
502/* Table of built-in functions. They can be forked or not, depending on
503 * context: within pipes, they fork. As simple commands, they do not.
504 * When used in non-forking context, they can change global variables
505 * in the parent shell process. If forked, of course they can not.
506 * For example, 'unset foo | whatever' will parse and run, but foo will
507 * still be set at the end. */
508static struct built_in_command bltins[] = {
509 {"bg", "Resume a job in the background", builtin_fg_bg},
510 {"break", "Exit for, while or until loop", builtin_not_written},
511 {"cd", "Change working directory", builtin_cd},
512 {"continue", "Continue for, while or until loop", builtin_not_written},
513 {"env", "Print all environment variables", builtin_env},
514 {"eval", "Construct and run shell command", builtin_eval},
515 {"exec", "Exec command, replacing this shell with the exec'd process",
516 builtin_exec},
517 {"exit", "Exit from shell()", builtin_exit},
518 {"export", "Set environment variable", builtin_export},
519 {"fg", "Bring job into the foreground", builtin_fg_bg},
520 {"jobs", "Lists the active jobs", builtin_jobs},
521 {"pwd", "Print current directory", builtin_pwd},
522 {"read", "Input environment variable", builtin_read},
523 {"return", "Return from a function", builtin_not_written},
524 {"set", "Set/unset shell local variables", builtin_set},
525 {"shift", "Shift positional parameters", builtin_shift},
526 {"trap", "Trap signals", builtin_not_written},
527 {"ulimit","Controls resource limits", builtin_not_written},
528 {"umask","Sets file creation mask", builtin_umask},
529 {"unset", "Unset environment variable", builtin_unset},
530 {".", "Source-in and run commands in a file", builtin_source},
531 {"help", "List shell built-in commands", builtin_help},
532 {NULL, NULL, NULL}
533};
534
535static const char *set_cwd(void)
536{
537 if(cwd==unknown)
538 cwd = NULL; /* xgetcwd(arg) called free(arg) */
539 cwd = xgetcwd((char *)cwd);
540 if (!cwd)
541 cwd = unknown;
542 return cwd;
543}
544
545/* built-in 'eval' handler */
546static int builtin_eval(struct child_prog *child)
547{
548 char *str = NULL;
549 int rcode = EXIT_SUCCESS;
550
551 if (child->argv[1]) {
552 str = make_string(child->argv + 1);
553 parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
554 FLAG_PARSE_SEMICOLON);
555 free(str);
556 rcode = last_return_code;
557 }
558 return rcode;
559}
560
561/* built-in 'cd <path>' handler */
562static int builtin_cd(struct child_prog *child)
563{
564 char *newdir;
565 if (child->argv[1] == NULL)
566 newdir = getenv("HOME");
567 else
568 newdir = child->argv[1];
569 if (chdir(newdir)) {
570 printf("cd: %s: %s\n", newdir, strerror(errno));
571 return EXIT_FAILURE;
572 }
573 set_cwd();
574 return EXIT_SUCCESS;
575}
576
577/* built-in 'env' handler */
578static int builtin_env(struct child_prog *dummy)
579{
580 char **e = environ;
581 if (e == NULL) return EXIT_FAILURE;
582 for (; *e; e++) {
583 puts(*e);
584 }
585 return EXIT_SUCCESS;
586}
587
588/* built-in 'exec' handler */
589static int builtin_exec(struct child_prog *child)
590{
591 if (child->argv[1] == NULL)
592 return EXIT_SUCCESS; /* Really? */
593 child->argv++;
594 pseudo_exec(child);
595 /* never returns */
596}
597
598/* built-in 'exit' handler */
599static int builtin_exit(struct child_prog *child)
600{
601 if (child->argv[1] == NULL)
602 exit(last_return_code);
603 exit (atoi(child->argv[1]));
604}
605
606/* built-in 'export VAR=value' handler */
607static int builtin_export(struct child_prog *child)
608{
609 int res = 0;
610 char *name = child->argv[1];
611
612 if (name == NULL) {
613 return (builtin_env(child));
614 }
615
616 name = strdup(name);
617
618 if(name) {
619 char *value = strchr(name, '=');
620
621 if (!value) {
622 char *tmp;
623 /* They are exporting something without an =VALUE */
624
625 value = get_local_var(name);
626 if (value) {
627 size_t ln = strlen(name);
628
629 tmp = realloc(name, ln+strlen(value)+2);
630 if(tmp==NULL)
631 res = -1;
632 else {
633 sprintf(tmp+ln, "=%s", value);
634 name = tmp;
635 }
636 } else {
637 /* bash does not return an error when trying to export
638 * an undefined variable. Do likewise. */
639 res = 1;
640 }
641 }
642 }
643 if (res<0)
644 perror_msg("export");
645 else if(res==0)
646 res = set_local_var(name, 1);
647 else
648 res = 0;
649 free(name);
650 return res;
651}
652
653/* built-in 'fg' and 'bg' handler */
654static int builtin_fg_bg(struct child_prog *child)
655{
656 int i, jobnum;
657 struct pipe *pi=NULL;
658
659 if (!interactive)
660 return EXIT_FAILURE;
661 /* If they gave us no args, assume they want the last backgrounded task */
662 if (!child->argv[1]) {
663 for (pi = job_list; pi; pi = pi->next) {
664 if (pi->jobid == last_jobid) {
665 break;
666 }
667 }
668 if (!pi) {
669 error_msg("%s: no current job", child->argv[0]);
670 return EXIT_FAILURE;
671 }
672 } else {
673 if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
674 error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
675 return EXIT_FAILURE;
676 }
677 for (pi = job_list; pi; pi = pi->next) {
678 if (pi->jobid == jobnum) {
679 break;
680 }
681 }
682 if (!pi) {
683 error_msg("%s: %d: no such job", child->argv[0], jobnum);
684 return EXIT_FAILURE;
685 }
686 }
687
688 if (*child->argv[0] == 'f') {
689 /* Put the job into the foreground. */
690 tcsetpgrp(shell_terminal, pi->pgrp);
691 }
692
693 /* Restart the processes in the job */
694 for (i = 0; i < pi->num_progs; i++)
695 pi->progs[i].is_stopped = 0;
696
697 if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
698 if (i == ESRCH) {
699 remove_bg_job(pi);
700 } else {
701 perror_msg("kill (SIGCONT)");
702 }
703 }
704
705 pi->stopped_progs = 0;
706 return EXIT_SUCCESS;
707}
708
709/* built-in 'help' handler */
710static int builtin_help(struct child_prog *dummy)
711{
712 struct built_in_command *x;
713
714 printf("\nBuilt-in commands:\n");
715 printf("-------------------\n");
716 for (x = bltins; x->cmd; x++) {
717 if (x->descr==NULL)
718 continue;
719 printf("%s\t%s\n", x->cmd, x->descr);
720 }
721 printf("\n\n");
722 return EXIT_SUCCESS;
723}
724
725/* built-in 'jobs' handler */
726static int builtin_jobs(struct child_prog *child)
727{
728 struct pipe *job;
729 char *status_string;
730
731 for (job = job_list; job; job = job->next) {
732 if (job->running_progs == job->stopped_progs)
733 status_string = "Stopped";
734 else
735 status_string = "Running";
736
737 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
738 }
739 return EXIT_SUCCESS;
740}
741
742
743/* built-in 'pwd' handler */
744static int builtin_pwd(struct child_prog *dummy)
745{
746 puts(set_cwd());
747 return EXIT_SUCCESS;
748}
749
750/* built-in 'read VAR' handler */
751static int builtin_read(struct child_prog *child)
752{
753 int res;
754
755 if (child->argv[1]) {
756 char string[BUFSIZ];
757 char *var = 0;
758
759 string[0] = 0; /* In case stdin has only EOF */
760 /* read string */
761 fgets(string, sizeof(string), stdin);
762 chomp(string);
763 var = malloc(strlen(child->argv[1])+strlen(string)+2);
764 if(var) {
765 sprintf(var, "%s=%s", child->argv[1], string);
766 res = set_local_var(var, 0);
767 } else
768 res = -1;
769 if (res)
770 fprintf(stderr, "read: %m\n");
771 free(var); /* So not move up to avoid breaking errno */
772 return res;
773 } else {
774 do res=getchar(); while(res!='\n' && res!=EOF);
775 return 0;
776 }
777}
778
779/* built-in 'set VAR=value' handler */
780static int builtin_set(struct child_prog *child)
781{
782 char *temp = child->argv[1];
783 struct variables *e;
784
785 if (temp == NULL)
786 for(e = top_vars; e; e=e->next)
787 printf("%s=%s\n", e->name, e->value);
788 else
789 set_local_var(temp, 0);
790
791 return EXIT_SUCCESS;
792}
793
794
795/* Built-in 'shift' handler */
796static int builtin_shift(struct child_prog *child)
797{
798 int n=1;
799 if (child->argv[1]) {
800 n=atoi(child->argv[1]);
801 }
802 if (n>=0 && n<global_argc) {
803 /* XXX This probably breaks $0 */
804 global_argc -= n;
805 global_argv += n;
806 return EXIT_SUCCESS;
807 } else {
808 return EXIT_FAILURE;
809 }
810}
811
812/* Built-in '.' handler (read-in and execute commands from file) */
813static int builtin_source(struct child_prog *child)
814{
815 FILE *input;
816 int status;
817
818 if (child->argv[1] == NULL)
819 return EXIT_FAILURE;
820
821 /* XXX search through $PATH is missing */
822 input = fopen(child->argv[1], "r");
823 if (!input) {
824 error_msg("Couldn't open file '%s'", child->argv[1]);
825 return EXIT_FAILURE;
826 }
827
828 /* Now run the file */
829 /* XXX argv and argc are broken; need to save old global_argv
830 * (pointer only is OK!) on this stack frame,
831 * set global_argv=child->argv+1, recurse, and restore. */
832 mark_open(fileno(input));
833 status = parse_file_outer(input);
834 mark_closed(fileno(input));
835 fclose(input);
836 return (status);
837}
838
839static int builtin_umask(struct child_prog *child)
840{
841 mode_t new_umask;
842 const char *arg = child->argv[1];
843 char *end;
844 if (arg) {
845 new_umask=strtoul(arg, &end, 8);
846 if (*end!='\0' || end == arg) {
847 return EXIT_FAILURE;
848 }
849 } else {
850 printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
851 }
852 umask(new_umask);
853 return EXIT_SUCCESS;
854}
855
856/* built-in 'unset VAR' handler */
857static int builtin_unset(struct child_prog *child)
858{
859 /* bash returned already true */
860 unset_local_var(child->argv[1]);
861 return EXIT_SUCCESS;
862}
863
864static int builtin_not_written(struct child_prog *child)
865{
866 printf("builtin_%s not written\n",child->argv[0]);
867 return EXIT_FAILURE;
868}
869#endif
870
871static int b_check_space(o_string *o, int len)
872{
873 /* It would be easy to drop a more restrictive policy
874 * in here, such as setting a maximum string length */
875 if (o->length + len > o->maxlen) {
876 char *old_data = o->data;
877 /* assert (data == NULL || o->maxlen != 0); */
878 o->maxlen += max(2*len, B_CHUNK);
879 o->data = realloc(o->data, 1 + o->maxlen);
880 if (o->data == NULL) {
881 free(old_data);
882 }
883 }
884 return o->data == NULL;
885}
886
887static int b_addchr(o_string *o, int ch)
888{
889 debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
890 if (b_check_space(o, 1)) return B_NOSPAC;
891 o->data[o->length] = ch;
892 o->length++;
893 o->data[o->length] = '\0';
894 return 0;
895}
896
897static void b_reset(o_string *o)
898{
899 o->length = 0;
900 o->nonnull = 0;
901 if (o->data != NULL) *o->data = '\0';
902}
903
904static void b_free(o_string *o)
905{
906 b_reset(o);
wdenkd0fb80c2003-01-11 09:48:40 +0000907 free(o->data);
wdenkfe8c2802002-11-03 00:38:21 +0000908 o->data = NULL;
909 o->maxlen = 0;
910}
911
912/* My analysis of quoting semantics tells me that state information
913 * is associated with a destination, not a source.
914 */
915static int b_addqchr(o_string *o, int ch, int quote)
916{
917 if (quote && strchr("*?[\\",ch)) {
918 int rc;
919 rc = b_addchr(o, '\\');
920 if (rc) return rc;
921 }
922 return b_addchr(o, ch);
923}
924
925/* belongs in utility.c */
926char *simple_itoa(unsigned int i)
927{
928 /* 21 digits plus null terminator, good for 64-bit or smaller ints */
929 static char local[22];
930 char *p = &local[21];
931 *p-- = '\0';
932 do {
933 *p-- = '0' + i % 10;
934 i /= 10;
935 } while (i > 0);
936 return p + 1;
937}
938
wdenkc26e4542004-04-18 10:13:26 +0000939#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +0000940static int b_adduint(o_string *o, unsigned int i)
941{
942 int r;
943 char *p = simple_itoa(i);
944 /* no escape checking necessary */
945 do r=b_addchr(o, *p++); while (r==0 && *p);
946 return r;
947}
wdenkc26e4542004-04-18 10:13:26 +0000948#endif
wdenkfe8c2802002-11-03 00:38:21 +0000949
950static int static_get(struct in_str *i)
951{
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +0200952 int ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +0000953 if (ch=='\0') return EOF;
954 return ch;
955}
956
957static int static_peek(struct in_str *i)
958{
959 return *i->p;
960}
961
962#ifndef __U_BOOT__
963static inline void cmdedit_set_initial_prompt(void)
964{
wdenkd0fb80c2003-01-11 09:48:40 +0000965#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000966 PS1 = NULL;
967#else
968 PS1 = getenv("PS1");
969 if(PS1==0)
970 PS1 = "\\w \\$ ";
971#endif
972}
973
974static inline void setup_prompt_string(int promptmode, char **prompt_str)
975{
976 debug_printf("setup_prompt_string %d ",promptmode);
wdenkd0fb80c2003-01-11 09:48:40 +0000977#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
wdenkfe8c2802002-11-03 00:38:21 +0000978 /* Set up the prompt */
979 if (promptmode == 1) {
wdenkd0fb80c2003-01-11 09:48:40 +0000980 free(PS1);
wdenkfe8c2802002-11-03 00:38:21 +0000981 PS1=xmalloc(strlen(cwd)+4);
982 sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# ");
983 *prompt_str = PS1;
984 } else {
985 *prompt_str = PS2;
986 }
987#else
988 *prompt_str = (promptmode==1)? PS1 : PS2;
989#endif
990 debug_printf("result %s\n",*prompt_str);
991}
992#endif
993
994static void get_user_input(struct in_str *i)
995{
996#ifndef __U_BOOT__
997 char *prompt_str;
998 static char the_command[BUFSIZ];
999
1000 setup_prompt_string(i->promptmode, &prompt_str);
wdenkd0fb80c2003-01-11 09:48:40 +00001001#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00001002 /*
1003 ** enable command line editing only while a command line
1004 ** is actually being read; otherwise, we'll end up bequeathing
1005 ** atexit() handlers and other unwanted stuff to our
1006 ** child processes (rob@sysgo.de)
1007 */
1008 cmdedit_read_input(prompt_str, the_command);
1009#else
1010 fputs(prompt_str, stdout);
1011 fflush(stdout);
1012 the_command[0]=fgetc(i->file);
1013 the_command[1]='\0';
1014#endif
1015 fflush(stdout);
1016 i->p = the_command;
1017#else
Remy Bohmer1f9d10f2010-06-17 21:17:08 +02001018 extern char console_buffer[];
wdenkfe8c2802002-11-03 00:38:21 +00001019 int n;
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001020 static char the_command[CONFIG_SYS_CBSIZE];
wdenkfe8c2802002-11-03 00:38:21 +00001021
Wolfgang Denk396387a2005-08-12 23:34:51 +02001022#ifdef CONFIG_BOOT_RETRY_TIME
Mike Frysinger882b7d72010-10-20 03:41:17 -04001023# ifndef CONFIG_RESET_TO_RETRY
Wolfgang Denk396387a2005-08-12 23:34:51 +02001024# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1025# endif
1026 reset_cmd_timeout();
1027#endif
wdenkfe8c2802002-11-03 00:38:21 +00001028 i->__promptme = 1;
1029 if (i->promptmode == 1) {
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001030 n = readline(CONFIG_SYS_PROMPT);
wdenkfe8c2802002-11-03 00:38:21 +00001031 } else {
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001032 n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
wdenkfe8c2802002-11-03 00:38:21 +00001033 }
Wolfgang Denk396387a2005-08-12 23:34:51 +02001034#ifdef CONFIG_BOOT_RETRY_TIME
1035 if (n == -2) {
1036 puts("\nTimeout waiting for command\n");
1037# ifdef CONFIG_RESET_TO_RETRY
1038 do_reset(NULL, 0, 0, NULL);
1039# else
1040# error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
1041# endif
1042 }
1043#endif
wdenkfe8c2802002-11-03 00:38:21 +00001044 if (n == -1 ) {
1045 flag_repeat = 0;
1046 i->__promptme = 0;
1047 }
1048 n = strlen(console_buffer);
1049 console_buffer[n] = '\n';
1050 console_buffer[n+1]= '\0';
1051 if (had_ctrlc()) flag_repeat = 0;
1052 clear_ctrlc();
1053 do_repeat = 0;
1054 if (i->promptmode == 1) {
1055 if (console_buffer[0] == '\n'&& flag_repeat == 0) {
1056 strcpy(the_command,console_buffer);
1057 }
1058 else {
1059 if (console_buffer[0] != '\n') {
1060 strcpy(the_command,console_buffer);
1061 flag_repeat = 1;
1062 }
1063 else {
1064 do_repeat = 1;
1065 }
1066 }
1067 i->p = the_command;
1068 }
1069 else {
wdenk8bde7f72003-06-27 21:31:46 +00001070 if (console_buffer[0] != '\n') {
1071 if (strlen(the_command) + strlen(console_buffer)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001072 < CONFIG_SYS_CBSIZE) {
wdenk8bde7f72003-06-27 21:31:46 +00001073 n = strlen(the_command);
1074 the_command[n-1] = ' ';
1075 strcpy(&the_command[n],console_buffer);
wdenkfe8c2802002-11-03 00:38:21 +00001076 }
1077 else {
1078 the_command[0] = '\n';
1079 the_command[1] = '\0';
1080 flag_repeat = 0;
1081 }
1082 }
1083 if (i->__promptme == 0) {
1084 the_command[0] = '\n';
1085 the_command[1] = '\0';
1086 }
1087 i->p = console_buffer;
1088 }
1089#endif
1090}
1091
1092/* This is the magic location that prints prompts
1093 * and gets data back from the user */
1094static int file_get(struct in_str *i)
1095{
1096 int ch;
1097
1098 ch = 0;
1099 /* If there is data waiting, eat it up */
1100 if (i->p && *i->p) {
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +02001101 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001102 } else {
1103 /* need to double check i->file because we might be doing something
1104 * more complicated by now, like sourcing or substituting. */
1105#ifndef __U_BOOT__
1106 if (i->__promptme && interactive && i->file == stdin) {
1107 while(! i->p || (interactive && strlen(i->p)==0) ) {
1108#else
1109 while(! i->p || strlen(i->p)==0 ) {
1110#endif
1111 get_user_input(i);
1112 }
1113 i->promptmode=2;
1114#ifndef __U_BOOT__
1115 i->__promptme = 0;
1116#endif
1117 if (i->p && *i->p) {
Wolfgang Denkd0ff51b2008-07-14 15:19:07 +02001118 ch = *i->p++;
wdenkfe8c2802002-11-03 00:38:21 +00001119 }
1120#ifndef __U_BOOT__
1121 } else {
1122 ch = fgetc(i->file);
1123 }
1124
1125#endif
1126 debug_printf("b_getch: got a %d\n", ch);
1127 }
1128#ifndef __U_BOOT__
1129 if (ch == '\n') i->__promptme=1;
1130#endif
1131 return ch;
1132}
1133
1134/* All the callers guarantee this routine will never be
1135 * used right after a newline, so prompting is not needed.
1136 */
1137static int file_peek(struct in_str *i)
1138{
1139#ifndef __U_BOOT__
1140 if (i->p && *i->p) {
1141#endif
1142 return *i->p;
1143#ifndef __U_BOOT__
1144 } else {
1145 i->peek_buf[0] = fgetc(i->file);
1146 i->peek_buf[1] = '\0';
1147 i->p = i->peek_buf;
1148 debug_printf("b_peek: got a %d\n", *i->p);
1149 return *i->p;
1150 }
1151#endif
1152}
1153
1154#ifndef __U_BOOT__
1155static void setup_file_in_str(struct in_str *i, FILE *f)
1156#else
1157static void setup_file_in_str(struct in_str *i)
1158#endif
1159{
1160 i->peek = file_peek;
1161 i->get = file_get;
1162 i->__promptme=1;
1163 i->promptmode=1;
1164#ifndef __U_BOOT__
1165 i->file = f;
1166#endif
1167 i->p = NULL;
1168}
1169
1170static void setup_string_in_str(struct in_str *i, const char *s)
1171{
1172 i->peek = static_peek;
1173 i->get = static_get;
1174 i->__promptme=1;
1175 i->promptmode=1;
1176 i->p = s;
1177}
1178
1179#ifndef __U_BOOT__
1180static void mark_open(int fd)
1181{
1182 struct close_me *new = xmalloc(sizeof(struct close_me));
1183 new->fd = fd;
1184 new->next = close_me_head;
1185 close_me_head = new;
1186}
1187
1188static void mark_closed(int fd)
1189{
1190 struct close_me *tmp;
1191 if (close_me_head == NULL || close_me_head->fd != fd)
1192 error_msg_and_die("corrupt close_me");
1193 tmp = close_me_head;
1194 close_me_head = close_me_head->next;
1195 free(tmp);
1196}
1197
wdenkd0fb80c2003-01-11 09:48:40 +00001198static void close_all(void)
wdenkfe8c2802002-11-03 00:38:21 +00001199{
1200 struct close_me *c;
1201 for (c=close_me_head; c; c=c->next) {
1202 close(c->fd);
1203 }
1204 close_me_head = NULL;
1205}
1206
1207/* squirrel != NULL means we squirrel away copies of stdin, stdout,
1208 * and stderr if they are redirected. */
1209static int setup_redirects(struct child_prog *prog, int squirrel[])
1210{
1211 int openfd, mode;
1212 struct redir_struct *redir;
1213
1214 for (redir=prog->redirects; redir; redir=redir->next) {
1215 if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
1216 /* something went wrong in the parse. Pretend it didn't happen */
1217 continue;
1218 }
1219 if (redir->dup == -1) {
1220 mode=redir_table[redir->type].mode;
1221 openfd = open(redir->word.gl_pathv[0], mode, 0666);
1222 if (openfd < 0) {
1223 /* this could get lost if stderr has been redirected, but
1224 bash and ash both lose it as well (though zsh doesn't!) */
1225 perror_msg("error opening %s", redir->word.gl_pathv[0]);
1226 return 1;
1227 }
1228 } else {
1229 openfd = redir->dup;
1230 }
1231
1232 if (openfd != redir->fd) {
1233 if (squirrel && redir->fd < 3) {
1234 squirrel[redir->fd] = dup(redir->fd);
1235 }
1236 if (openfd == -3) {
1237 close(openfd);
1238 } else {
1239 dup2(openfd, redir->fd);
1240 if (redir->dup == -1)
1241 close (openfd);
1242 }
1243 }
1244 }
1245 return 0;
1246}
1247
1248static void restore_redirects(int squirrel[])
1249{
1250 int i, fd;
1251 for (i=0; i<3; i++) {
1252 fd = squirrel[i];
1253 if (fd != -1) {
1254 /* No error checking. I sure wouldn't know what
1255 * to do with an error if I found one! */
1256 dup2(fd, i);
1257 close(fd);
1258 }
1259 }
1260}
1261
1262/* never returns */
1263/* XXX no exit() here. If you don't exec, use _exit instead.
1264 * The at_exit handlers apparently confuse the calling process,
1265 * in particular stdin handling. Not sure why? */
1266static void pseudo_exec(struct child_prog *child)
1267{
1268 int i, rcode;
1269 char *p;
1270 struct built_in_command *x;
1271 if (child->argv) {
1272 for (i=0; is_assignment(child->argv[i]); i++) {
1273 debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
1274 p = insert_var_value(child->argv[i]);
1275 putenv(strdup(p));
1276 if (p != child->argv[i]) free(p);
1277 }
1278 child->argv+=i; /* XXX this hack isn't so horrible, since we are about
wdenk8bde7f72003-06-27 21:31:46 +00001279 to exit, and therefore don't need to keep data
1280 structures consistent for free() use. */
wdenkfe8c2802002-11-03 00:38:21 +00001281 /* If a variable is assigned in a forest, and nobody listens,
1282 * was it ever really set?
1283 */
1284 if (child->argv[0] == NULL) {
1285 _exit(EXIT_SUCCESS);
1286 }
1287
1288 /*
1289 * Check if the command matches any of the builtins.
1290 * Depending on context, this might be redundant. But it's
1291 * easier to waste a few CPU cycles than it is to figure out
1292 * if this is one of those cases.
1293 */
1294 for (x = bltins; x->cmd; x++) {
1295 if (strcmp(child->argv[0], x->cmd) == 0 ) {
1296 debug_printf("builtin exec %s\n", child->argv[0]);
1297 rcode = x->function(child);
1298 fflush(stdout);
1299 _exit(rcode);
1300 }
1301 }
1302
1303 /* Check if the command matches any busybox internal commands
1304 * ("applets") here.
1305 * FIXME: This feature is not 100% safe, since
1306 * BusyBox is not fully reentrant, so we have no guarantee the things
1307 * from the .bss are still zeroed, or that things from .data are still
1308 * at their defaults. We could exec ourself from /proc/self/exe, but I
1309 * really dislike relying on /proc for things. We could exec ourself
1310 * from global_argv[0], but if we are in a chroot, we may not be able
1311 * to find ourself... */
wdenkd0fb80c2003-01-11 09:48:40 +00001312#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
wdenkfe8c2802002-11-03 00:38:21 +00001313 {
1314 int argc_l;
1315 char** argv_l=child->argv;
1316 char *name = child->argv[0];
1317
wdenkd0fb80c2003-01-11 09:48:40 +00001318#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
wdenkfe8c2802002-11-03 00:38:21 +00001319 /* Following discussions from November 2000 on the busybox mailing
1320 * list, the default configuration, (without
1321 * get_last_path_component()) lets the user force use of an
1322 * external command by specifying the full (with slashes) filename.
wdenkd0fb80c2003-01-11 09:48:40 +00001323 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
wdenkfe8c2802002-11-03 00:38:21 +00001324 * _aways_ override external commands, so if you want to run
1325 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
1326 * filesystem and is _not_ busybox. Some systems may want this,
1327 * most do not. */
1328 name = get_last_path_component(name);
1329#endif
1330 /* Count argc for use in a second... */
1331 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
1332 optind = 1;
1333 debug_printf("running applet %s\n", name);
1334 run_applet_by_name(name, argc_l, child->argv);
1335 }
1336#endif
1337 debug_printf("exec of %s\n",child->argv[0]);
1338 execvp(child->argv[0],child->argv);
1339 perror_msg("couldn't exec: %s",child->argv[0]);
1340 _exit(1);
1341 } else if (child->group) {
1342 debug_printf("runtime nesting to group\n");
1343 interactive=0; /* crucial!!!! */
1344 rcode = run_list_real(child->group);
1345 /* OK to leak memory by not calling free_pipe_list,
1346 * since this process is about to exit */
1347 _exit(rcode);
1348 } else {
1349 /* Can happen. See what bash does with ">foo" by itself. */
1350 debug_printf("trying to pseudo_exec null command\n");
1351 _exit(EXIT_SUCCESS);
1352 }
1353}
1354
1355static void insert_bg_job(struct pipe *pi)
1356{
1357 struct pipe *thejob;
1358
1359 /* Linear search for the ID of the job to use */
1360 pi->jobid = 1;
1361 for (thejob = job_list; thejob; thejob = thejob->next)
1362 if (thejob->jobid >= pi->jobid)
1363 pi->jobid = thejob->jobid + 1;
1364
1365 /* add thejob to the list of running jobs */
1366 if (!job_list) {
1367 thejob = job_list = xmalloc(sizeof(*thejob));
1368 } else {
1369 for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
1370 thejob->next = xmalloc(sizeof(*thejob));
1371 thejob = thejob->next;
1372 }
1373
1374 /* physically copy the struct job */
1375 memcpy(thejob, pi, sizeof(struct pipe));
1376 thejob->next = NULL;
1377 thejob->running_progs = thejob->num_progs;
1378 thejob->stopped_progs = 0;
1379 thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
1380
1381 /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
1382 {
1383 char *bar=thejob->text;
1384 char **foo=pi->progs[0].argv;
1385 while(foo && *foo) {
1386 bar += sprintf(bar, "%s ", *foo++);
1387 }
1388 }
1389
1390 /* we don't wait for background thejobs to return -- append it
1391 to the list of backgrounded thejobs and leave it alone */
1392 printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
1393 last_bg_pid = thejob->progs[0].pid;
1394 last_jobid = thejob->jobid;
1395}
1396
1397/* remove a backgrounded job */
1398static void remove_bg_job(struct pipe *pi)
1399{
1400 struct pipe *prev_pipe;
1401
1402 if (pi == job_list) {
1403 job_list = pi->next;
1404 } else {
1405 prev_pipe = job_list;
1406 while (prev_pipe->next != pi)
1407 prev_pipe = prev_pipe->next;
1408 prev_pipe->next = pi->next;
1409 }
1410 if (job_list)
1411 last_jobid = job_list->jobid;
1412 else
1413 last_jobid = 0;
1414
1415 pi->stopped_progs = 0;
1416 free_pipe(pi, 0);
1417 free(pi);
1418}
1419
1420/* Checks to see if any processes have exited -- if they
1421 have, figure out why and see if a job has completed */
1422static int checkjobs(struct pipe* fg_pipe)
1423{
1424 int attributes;
1425 int status;
1426 int prognum = 0;
1427 struct pipe *pi;
1428 pid_t childpid;
1429
1430 attributes = WUNTRACED;
1431 if (fg_pipe==NULL) {
1432 attributes |= WNOHANG;
1433 }
1434
1435 while ((childpid = waitpid(-1, &status, attributes)) > 0) {
1436 if (fg_pipe) {
1437 int i, rcode = 0;
1438 for (i=0; i < fg_pipe->num_progs; i++) {
1439 if (fg_pipe->progs[i].pid == childpid) {
1440 if (i==fg_pipe->num_progs-1)
1441 rcode=WEXITSTATUS(status);
1442 (fg_pipe->num_progs)--;
1443 return(rcode);
1444 }
1445 }
1446 }
1447
1448 for (pi = job_list; pi; pi = pi->next) {
1449 prognum = 0;
1450 while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
1451 prognum++;
1452 }
1453 if (prognum < pi->num_progs)
1454 break;
1455 }
1456
1457 if(pi==NULL) {
1458 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
1459 continue;
1460 }
1461
1462 if (WIFEXITED(status) || WIFSIGNALED(status)) {
1463 /* child exited */
1464 pi->running_progs--;
1465 pi->progs[prognum].pid = 0;
1466
1467 if (!pi->running_progs) {
1468 printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
1469 remove_bg_job(pi);
1470 }
1471 } else {
1472 /* child stopped */
1473 pi->stopped_progs++;
1474 pi->progs[prognum].is_stopped = 1;
1475
1476#if 0
1477 /* Printing this stuff is a pain, since it tends to
1478 * overwrite the prompt an inconveinient moments. So
1479 * don't do that. */
1480 if (pi->stopped_progs == pi->num_progs) {
1481 printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
1482 }
1483#endif
1484 }
1485 }
1486
1487 if (childpid == -1 && errno != ECHILD)
1488 perror_msg("waitpid");
1489
1490 /* move the shell to the foreground */
1491 /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
1492 /* perror_msg("tcsetpgrp-2"); */
1493 return -1;
1494}
1495
1496/* Figure out our controlling tty, checking in order stderr,
1497 * stdin, and stdout. If check_pgrp is set, also check that
1498 * we belong to the foreground process group associated with
1499 * that tty. The value of shell_terminal is needed in order to call
1500 * tcsetpgrp(shell_terminal, ...); */
1501void controlling_tty(int check_pgrp)
1502{
1503 pid_t curpgrp;
1504
1505 if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
1506 && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
1507 && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
1508 goto shell_terminal_error;
1509
1510 if (check_pgrp && curpgrp != getpgid(0))
1511 goto shell_terminal_error;
1512
1513 return;
1514
1515shell_terminal_error:
1516 shell_terminal = -1;
1517 return;
1518}
1519#endif
1520
1521/* run_pipe_real() starts all the jobs, but doesn't wait for anything
1522 * to finish. See checkjobs().
1523 *
1524 * return code is normally -1, when the caller has to wait for children
1525 * to finish to determine the exit status of the pipe. If the pipe
1526 * is a simple builtin command, however, the action is done by the
1527 * time run_pipe_real returns, and the exit code is provided as the
1528 * return value.
1529 *
1530 * The input of the pipe is always stdin, the output is always
1531 * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
1532 * because it tries to avoid running the command substitution in
1533 * subshell, when that is in fact necessary. The subshell process
1534 * now has its stdout directed to the input of the appropriate pipe,
1535 * so this routine is noticeably simpler.
1536 */
1537static int run_pipe_real(struct pipe *pi)
1538{
1539 int i;
1540#ifndef __U_BOOT__
1541 int nextin, nextout;
1542 int pipefds[2]; /* pipefds[0] is for reading */
1543 struct child_prog *child;
1544 struct built_in_command *x;
1545 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001546# if __GNUC__
1547 /* Avoid longjmp clobbering */
1548 (void) &i;
1549 (void) &nextin;
1550 (void) &nextout;
1551 (void) &child;
1552# endif
wdenkfe8c2802002-11-03 00:38:21 +00001553#else
1554 int nextin;
1555 int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
1556 struct child_prog *child;
1557 cmd_tbl_t *cmdtp;
1558 char *p;
wdenkd0fb80c2003-01-11 09:48:40 +00001559# if __GNUC__
1560 /* Avoid longjmp clobbering */
1561 (void) &i;
1562 (void) &nextin;
1563 (void) &child;
1564# endif
1565#endif /* __U_BOOT__ */
wdenkfe8c2802002-11-03 00:38:21 +00001566
1567 nextin = 0;
1568#ifndef __U_BOOT__
1569 pi->pgrp = -1;
1570#endif
1571
1572 /* Check if this is a simple builtin (not part of a pipe).
1573 * Builtins within pipes have to fork anyway, and are handled in
1574 * pseudo_exec. "echo foo | read bar" doesn't work on bash, either.
1575 */
1576 if (pi->num_progs == 1) child = & (pi->progs[0]);
1577#ifndef __U_BOOT__
1578 if (pi->num_progs == 1 && child->group && child->subshell == 0) {
1579 int squirrel[] = {-1, -1, -1};
1580 int rcode;
1581 debug_printf("non-subshell grouping\n");
1582 setup_redirects(child, squirrel);
1583 /* XXX could we merge code with following builtin case,
1584 * by creating a pseudo builtin that calls run_list_real? */
1585 rcode = run_list_real(child->group);
1586 restore_redirects(squirrel);
1587#else
1588 if (pi->num_progs == 1 && child->group) {
1589 int rcode;
1590 debug_printf("non-subshell grouping\n");
1591 rcode = run_list_real(child->group);
1592#endif
1593 return rcode;
1594 } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
1595 for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
1596 if (i!=0 && child->argv[i]==NULL) {
1597 /* assignments, but no command: set the local environment */
1598 for (i=0; child->argv[i]!=NULL; i++) {
1599
1600 /* Ok, this case is tricky. We have to decide if this is a
1601 * local variable, or an already exported variable. If it is
1602 * already exported, we have to export the new value. If it is
1603 * not exported, we need only set this as a local variable.
1604 * This junk is all to decide whether or not to export this
1605 * variable. */
1606 int export_me=0;
1607 char *name, *value;
1608 name = xstrdup(child->argv[i]);
1609 debug_printf("Local environment set: %s\n", name);
1610 value = strchr(name, '=');
1611 if (value)
1612 *value=0;
1613#ifndef __U_BOOT__
1614 if ( get_local_var(name)) {
1615 export_me=1;
1616 }
1617#endif
1618 free(name);
1619 p = insert_var_value(child->argv[i]);
1620 set_local_var(p, export_me);
1621 if (p != child->argv[i]) free(p);
1622 }
1623 return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
1624 }
1625 for (i = 0; is_assignment(child->argv[i]); i++) {
1626 p = insert_var_value(child->argv[i]);
1627#ifndef __U_BOOT__
1628 putenv(strdup(p));
1629#else
1630 set_local_var(p, 0);
1631#endif
1632 if (p != child->argv[i]) {
1633 child->sp--;
1634 free(p);
1635 }
1636 }
1637 if (child->sp) {
1638 char * str = NULL;
1639
1640 str = make_string((child->argv + i));
1641 parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
1642 free(str);
1643 return last_return_code;
1644 }
1645#ifndef __U_BOOT__
1646 for (x = bltins; x->cmd; x++) {
1647 if (strcmp(child->argv[i], x->cmd) == 0 ) {
1648 int squirrel[] = {-1, -1, -1};
1649 int rcode;
1650 if (x->function == builtin_exec && child->argv[i+1]==NULL) {
1651 debug_printf("magic exec\n");
1652 setup_redirects(child,NULL);
1653 return EXIT_SUCCESS;
1654 }
1655 debug_printf("builtin inline %s\n", child->argv[0]);
1656 /* XXX setup_redirects acts on file descriptors, not FILEs.
1657 * This is perfect for work that comes after exec().
1658 * Is it really safe for inline use? Experimentally,
1659 * things seem to work with glibc. */
1660 setup_redirects(child, squirrel);
1661#else
1662 /* check ";", because ,example , argv consist from
1663 * "help;flinfo" must not execute
1664 */
1665 if (strchr(child->argv[i], ';')) {
1666 printf ("Unknown command '%s' - try 'help' or use 'run' command\n",
1667 child->argv[i]);
1668 return -1;
1669 }
wdenk8bde7f72003-06-27 21:31:46 +00001670 /* Look up command in command table */
1671
1672
wdenkfe8c2802002-11-03 00:38:21 +00001673 if ((cmdtp = find_cmd(child->argv[i])) == NULL) {
1674 printf ("Unknown command '%s' - try 'help'\n", child->argv[i]);
1675 return -1; /* give up after bad command */
1676 } else {
1677 int rcode;
Jon Loeligerc3517f92007-07-08 18:10:08 -05001678#if defined(CONFIG_CMD_BOOTD)
wdenk8bde7f72003-06-27 21:31:46 +00001679 /* avoid "bootd" recursion */
wdenkfe8c2802002-11-03 00:38:21 +00001680 if (cmdtp->cmd == do_bootd) {
1681 if (flag & CMD_FLAG_BOOTD) {
1682 printf ("'bootd' recursion detected\n");
1683 return -1;
1684 }
1685 else
1686 flag |= CMD_FLAG_BOOTD;
1687 }
Jon Loeliger90253172007-07-10 11:02:44 -05001688#endif
wdenk8bde7f72003-06-27 21:31:46 +00001689 /* found - check max args */
Wolfgang Denk47e26b12010-07-17 01:06:04 +02001690 if ((child->argc - i) > cmdtp->maxargs)
1691 return cmd_usage(cmdtp);
wdenkfe8c2802002-11-03 00:38:21 +00001692#endif
1693 child->argv+=i; /* XXX horrible hack */
1694#ifndef __U_BOOT__
1695 rcode = x->function(child);
1696#else
1697 /* OK - call function to do the command */
wdenk8bde7f72003-06-27 21:31:46 +00001698
wdenkfe8c2802002-11-03 00:38:21 +00001699 rcode = (cmdtp->cmd)
wdenk8bde7f72003-06-27 21:31:46 +00001700(cmdtp, flag,child->argc-i,&child->argv[i]);
wdenkfe8c2802002-11-03 00:38:21 +00001701 if ( !cmdtp->repeatable )
1702 flag_repeat = 0;
wdenk8bde7f72003-06-27 21:31:46 +00001703
1704
wdenkfe8c2802002-11-03 00:38:21 +00001705#endif
1706 child->argv-=i; /* XXX restore hack so free() can work right */
1707#ifndef __U_BOOT__
wdenk8bde7f72003-06-27 21:31:46 +00001708
wdenkfe8c2802002-11-03 00:38:21 +00001709 restore_redirects(squirrel);
1710#endif
wdenk8bde7f72003-06-27 21:31:46 +00001711
wdenkfe8c2802002-11-03 00:38:21 +00001712 return rcode;
1713 }
1714 }
1715#ifndef __U_BOOT__
1716 }
1717
1718 for (i = 0; i < pi->num_progs; i++) {
1719 child = & (pi->progs[i]);
1720
1721 /* pipes are inserted between pairs of commands */
1722 if ((i + 1) < pi->num_progs) {
1723 if (pipe(pipefds)<0) perror_msg_and_die("pipe");
1724 nextout = pipefds[1];
1725 } else {
1726 nextout=1;
1727 pipefds[0] = -1;
1728 }
1729
1730 /* XXX test for failed fork()? */
1731 if (!(child->pid = fork())) {
1732 /* Set the handling for job control signals back to the default. */
1733 signal(SIGINT, SIG_DFL);
1734 signal(SIGQUIT, SIG_DFL);
1735 signal(SIGTERM, SIG_DFL);
1736 signal(SIGTSTP, SIG_DFL);
1737 signal(SIGTTIN, SIG_DFL);
1738 signal(SIGTTOU, SIG_DFL);
1739 signal(SIGCHLD, SIG_DFL);
1740
1741 close_all();
1742
1743 if (nextin != 0) {
1744 dup2(nextin, 0);
1745 close(nextin);
1746 }
1747 if (nextout != 1) {
1748 dup2(nextout, 1);
1749 close(nextout);
1750 }
1751 if (pipefds[0]!=-1) {
1752 close(pipefds[0]); /* opposite end of our output pipe */
1753 }
1754
1755 /* Like bash, explicit redirects override pipes,
1756 * and the pipe fd is available for dup'ing. */
1757 setup_redirects(child,NULL);
1758
1759 if (interactive && pi->followup!=PIPE_BG) {
1760 /* If we (the child) win the race, put ourselves in the process
1761 * group whose leader is the first process in this pipe. */
1762 if (pi->pgrp < 0) {
1763 pi->pgrp = getpid();
1764 }
1765 if (setpgid(0, pi->pgrp) == 0) {
1766 tcsetpgrp(2, pi->pgrp);
1767 }
1768 }
1769
1770 pseudo_exec(child);
1771 }
1772
1773
1774 /* put our child in the process group whose leader is the
1775 first process in this pipe */
1776 if (pi->pgrp < 0) {
1777 pi->pgrp = child->pid;
1778 }
1779 /* Don't check for errors. The child may be dead already,
1780 * in which case setpgid returns error code EACCES. */
1781 setpgid(child->pid, pi->pgrp);
1782
1783 if (nextin != 0)
1784 close(nextin);
1785 if (nextout != 1)
1786 close(nextout);
1787
1788 /* If there isn't another process, nextin is garbage
1789 but it doesn't matter */
1790 nextin = pipefds[0];
1791 }
1792#endif
1793 return -1;
1794}
1795
1796static int run_list_real(struct pipe *pi)
1797{
1798 char *save_name = NULL;
1799 char **list = NULL;
1800 char **save_list = NULL;
1801 struct pipe *rpipe;
1802 int flag_rep = 0;
1803#ifndef __U_BOOT__
1804 int save_num_progs;
1805#endif
1806 int rcode=0, flag_skip=1;
1807 int flag_restore = 0;
1808 int if_code=0, next_if_code=0; /* need double-buffer to handle elif */
1809 reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
1810 /* check syntax for "for" */
1811 for (rpipe = pi; rpipe; rpipe = rpipe->next) {
1812 if ((rpipe->r_mode == RES_IN ||
1813 rpipe->r_mode == RES_FOR) &&
1814 (rpipe->next == NULL)) {
1815 syntax();
1816#ifdef __U_BOOT__
1817 flag_repeat = 0;
1818#endif
1819 return 1;
1820 }
1821 if ((rpipe->r_mode == RES_IN &&
1822 (rpipe->next->r_mode == RES_IN &&
1823 rpipe->next->progs->argv != NULL))||
1824 (rpipe->r_mode == RES_FOR &&
1825 rpipe->next->r_mode != RES_IN)) {
1826 syntax();
1827#ifdef __U_BOOT__
1828 flag_repeat = 0;
1829#endif
1830 return 1;
1831 }
1832 }
1833 for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
1834 if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
1835 pi->r_mode == RES_FOR) {
1836#ifdef __U_BOOT__
1837 /* check Ctrl-C */
1838 ctrlc();
1839 if ((had_ctrlc())) {
1840 return 1;
1841 }
1842#endif
1843 flag_restore = 0;
1844 if (!rpipe) {
1845 flag_rep = 0;
1846 rpipe = pi;
1847 }
1848 }
1849 rmode = pi->r_mode;
1850 debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode);
1851 if (rmode == skip_more_in_this_rmode && flag_skip) {
1852 if (pi->followup == PIPE_SEQ) flag_skip=0;
1853 continue;
1854 }
1855 flag_skip = 1;
1856 skip_more_in_this_rmode = RES_XXXX;
1857 if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
1858 if (rmode == RES_THEN && if_code) continue;
1859 if (rmode == RES_ELSE && !if_code) continue;
wdenk56b86bf2004-04-12 14:31:43 +00001860 if (rmode == RES_ELIF && !if_code) break;
wdenkfe8c2802002-11-03 00:38:21 +00001861 if (rmode == RES_FOR && pi->num_progs) {
1862 if (!list) {
1863 /* if no variable values after "in" we skip "for" */
1864 if (!pi->next->progs->argv) continue;
1865 /* create list of variable values */
1866 list = make_list_in(pi->next->progs->argv,
1867 pi->progs->argv[0]);
1868 save_list = list;
1869 save_name = pi->progs->argv[0];
1870 pi->progs->argv[0] = NULL;
1871 flag_rep = 1;
1872 }
1873 if (!(*list)) {
1874 free(pi->progs->argv[0]);
1875 free(save_list);
1876 list = NULL;
1877 flag_rep = 0;
1878 pi->progs->argv[0] = save_name;
1879#ifndef __U_BOOT__
1880 pi->progs->glob_result.gl_pathv[0] =
1881 pi->progs->argv[0];
1882#endif
1883 continue;
1884 } else {
1885 /* insert new value from list for variable */
1886 if (pi->progs->argv[0])
1887 free(pi->progs->argv[0]);
1888 pi->progs->argv[0] = *list++;
1889#ifndef __U_BOOT__
1890 pi->progs->glob_result.gl_pathv[0] =
1891 pi->progs->argv[0];
1892#endif
1893 }
1894 }
1895 if (rmode == RES_IN) continue;
1896 if (rmode == RES_DO) {
1897 if (!flag_rep) continue;
1898 }
1899 if ((rmode == RES_DONE)) {
1900 if (flag_rep) {
1901 flag_restore = 1;
1902 } else {
1903 rpipe = NULL;
1904 }
1905 }
1906 if (pi->num_progs == 0) continue;
1907#ifndef __U_BOOT__
1908 save_num_progs = pi->num_progs; /* save number of programs */
1909#endif
1910 rcode = run_pipe_real(pi);
1911 debug_printf("run_pipe_real returned %d\n",rcode);
1912#ifndef __U_BOOT__
1913 if (rcode!=-1) {
1914 /* We only ran a builtin: rcode was set by the return value
1915 * of run_pipe_real(), and we don't need to wait for anything. */
1916 } else if (pi->followup==PIPE_BG) {
1917 /* XXX check bash's behavior with nontrivial pipes */
1918 /* XXX compute jobid */
1919 /* XXX what does bash do with attempts to background builtins? */
1920 insert_bg_job(pi);
1921 rcode = EXIT_SUCCESS;
1922 } else {
1923 if (interactive) {
1924 /* move the new process group into the foreground */
1925 if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
1926 perror_msg("tcsetpgrp-3");
1927 rcode = checkjobs(pi);
1928 /* move the shell to the foreground */
1929 if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
1930 perror_msg("tcsetpgrp-4");
1931 } else {
1932 rcode = checkjobs(pi);
1933 }
1934 debug_printf("checkjobs returned %d\n",rcode);
1935 }
1936 last_return_code=rcode;
1937#else
wdenkc26e4542004-04-18 10:13:26 +00001938 if (rcode < -1) {
1939 last_return_code = -rcode - 2;
1940 return -2; /* exit */
1941 }
wdenkfe8c2802002-11-03 00:38:21 +00001942 last_return_code=(rcode == 0) ? 0 : 1;
1943#endif
1944#ifndef __U_BOOT__
1945 pi->num_progs = save_num_progs; /* restore number of programs */
1946#endif
1947 if ( rmode == RES_IF || rmode == RES_ELIF )
1948 next_if_code=rcode; /* can be overwritten a number of times */
1949 if (rmode == RES_WHILE)
1950 flag_rep = !last_return_code;
1951 if (rmode == RES_UNTIL)
1952 flag_rep = last_return_code;
1953 if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
1954 (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
1955 skip_more_in_this_rmode=rmode;
1956#ifndef __U_BOOT__
1957 checkjobs(NULL);
1958#endif
1959 }
1960 return rcode;
1961}
1962
1963/* broken, of course, but OK for testing */
1964static char *indenter(int i)
1965{
1966 static char blanks[]=" ";
1967 return &blanks[sizeof(blanks)-i-1];
1968}
1969
1970/* return code is the exit status of the pipe */
1971static int free_pipe(struct pipe *pi, int indent)
1972{
1973 char **p;
1974 struct child_prog *child;
1975#ifndef __U_BOOT__
1976 struct redir_struct *r, *rnext;
1977#endif
1978 int a, i, ret_code=0;
1979 char *ind = indenter(indent);
1980
1981#ifndef __U_BOOT__
1982 if (pi->stopped_progs > 0)
1983 return ret_code;
1984 final_printf("%s run pipe: (pid %d)\n",ind,getpid());
1985#endif
1986 for (i=0; i<pi->num_progs; i++) {
1987 child = &pi->progs[i];
1988 final_printf("%s command %d:\n",ind,i);
1989 if (child->argv) {
1990 for (a=0,p=child->argv; *p; a++,p++) {
1991 final_printf("%s argv[%d] = %s\n",ind,a,*p);
1992 }
1993#ifndef __U_BOOT__
1994 globfree(&child->glob_result);
1995#else
Peter Tyser197324d2009-08-05 16:18:44 -05001996 for (a = 0; a < child->argc; a++) {
wdenk8bde7f72003-06-27 21:31:46 +00001997 free(child->argv[a]);
1998 }
wdenkfe8c2802002-11-03 00:38:21 +00001999 free(child->argv);
wdenk8bde7f72003-06-27 21:31:46 +00002000 child->argc = 0;
wdenkfe8c2802002-11-03 00:38:21 +00002001#endif
2002 child->argv=NULL;
2003 } else if (child->group) {
2004#ifndef __U_BOOT__
2005 final_printf("%s begin group (subshell:%d)\n",ind, child->subshell);
2006#endif
2007 ret_code = free_pipe_list(child->group,indent+3);
2008 final_printf("%s end group\n",ind);
2009 } else {
2010 final_printf("%s (nil)\n",ind);
2011 }
2012#ifndef __U_BOOT__
2013 for (r=child->redirects; r; r=rnext) {
2014 final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
2015 if (r->dup == -1) {
2016 /* guard against the case >$FOO, where foo is unset or blank */
2017 if (r->word.gl_pathv) {
2018 final_printf(" %s\n", *r->word.gl_pathv);
2019 globfree(&r->word);
2020 }
2021 } else {
2022 final_printf("&%d\n", r->dup);
2023 }
2024 rnext=r->next;
2025 free(r);
2026 }
2027 child->redirects=NULL;
2028#endif
2029 }
2030 free(pi->progs); /* children are an array, they get freed all at once */
2031 pi->progs=NULL;
2032 return ret_code;
2033}
2034
2035static int free_pipe_list(struct pipe *head, int indent)
2036{
2037 int rcode=0; /* if list has no members */
2038 struct pipe *pi, *next;
2039 char *ind = indenter(indent);
2040 for (pi=head; pi; pi=next) {
2041 final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
2042 rcode = free_pipe(pi, indent);
2043 final_printf("%s pipe followup code %d\n", ind, pi->followup);
2044 next=pi->next;
2045 pi->next=NULL;
2046 free(pi);
2047 }
2048 return rcode;
2049}
2050
2051/* Select which version we will use */
2052static int run_list(struct pipe *pi)
2053{
2054 int rcode=0;
2055#ifndef __U_BOOT__
2056 if (fake_mode==0) {
2057#endif
2058 rcode = run_list_real(pi);
2059#ifndef __U_BOOT__
2060 }
2061#endif
2062 /* free_pipe_list has the side effect of clearing memory
2063 * In the long run that function can be merged with run_list_real,
2064 * but doing that now would hobble the debugging effort. */
2065 free_pipe_list(pi,0);
2066 return rcode;
2067}
2068
2069/* The API for glob is arguably broken. This routine pushes a non-matching
2070 * string into the output structure, removing non-backslashed backslashes.
2071 * If someone can prove me wrong, by performing this function within the
2072 * original glob(3) api, feel free to rewrite this routine into oblivion.
2073 * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
2074 * XXX broken if the last character is '\\', check that before calling.
2075 */
2076#ifndef __U_BOOT__
2077static int globhack(const char *src, int flags, glob_t *pglob)
2078{
2079 int cnt=0, pathc;
2080 const char *s;
2081 char *dest;
2082 for (cnt=1, s=src; s && *s; s++) {
2083 if (*s == '\\') s++;
2084 cnt++;
2085 }
2086 dest = malloc(cnt);
2087 if (!dest) return GLOB_NOSPACE;
2088 if (!(flags & GLOB_APPEND)) {
2089 pglob->gl_pathv=NULL;
2090 pglob->gl_pathc=0;
2091 pglob->gl_offs=0;
2092 pglob->gl_offs=0;
2093 }
2094 pathc = ++pglob->gl_pathc;
2095 pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
2096 if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
2097 pglob->gl_pathv[pathc-1]=dest;
2098 pglob->gl_pathv[pathc]=NULL;
2099 for (s=src; s && *s; s++, dest++) {
2100 if (*s == '\\') s++;
2101 *dest = *s;
2102 }
2103 *dest='\0';
2104 return 0;
2105}
2106
2107/* XXX broken if the last character is '\\', check that before calling */
2108static int glob_needed(const char *s)
2109{
2110 for (; *s; s++) {
2111 if (*s == '\\') s++;
2112 if (strchr("*[?",*s)) return 1;
2113 }
2114 return 0;
2115}
2116
2117#if 0
2118static void globprint(glob_t *pglob)
2119{
2120 int i;
2121 debug_printf("glob_t at %p:\n", pglob);
2122 debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n",
2123 pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
2124 for (i=0; i<pglob->gl_pathc; i++)
2125 debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
2126 pglob->gl_pathv[i], pglob->gl_pathv[i]);
2127}
2128#endif
2129
2130static int xglob(o_string *dest, int flags, glob_t *pglob)
2131{
2132 int gr;
2133
wdenk8bde7f72003-06-27 21:31:46 +00002134 /* short-circuit for null word */
wdenkfe8c2802002-11-03 00:38:21 +00002135 /* we can code this better when the debug_printf's are gone */
wdenk8bde7f72003-06-27 21:31:46 +00002136 if (dest->length == 0) {
2137 if (dest->nonnull) {
2138 /* bash man page calls this an "explicit" null */
2139 gr = globhack(dest->data, flags, pglob);
2140 debug_printf("globhack returned %d\n",gr);
2141 } else {
wdenkfe8c2802002-11-03 00:38:21 +00002142 return 0;
2143 }
wdenk8bde7f72003-06-27 21:31:46 +00002144 } else if (glob_needed(dest->data)) {
wdenkfe8c2802002-11-03 00:38:21 +00002145 gr = glob(dest->data, flags, NULL, pglob);
2146 debug_printf("glob returned %d\n",gr);
2147 if (gr == GLOB_NOMATCH) {
2148 /* quote removal, or more accurately, backslash removal */
2149 gr = globhack(dest->data, flags, pglob);
2150 debug_printf("globhack returned %d\n",gr);
2151 }
2152 } else {
2153 gr = globhack(dest->data, flags, pglob);
2154 debug_printf("globhack returned %d\n",gr);
2155 }
2156 if (gr == GLOB_NOSPACE)
2157 error_msg_and_die("out of memory during glob");
2158 if (gr != 0) { /* GLOB_ABORTED ? */
2159 error_msg("glob(3) error %d",gr);
2160 }
2161 /* globprint(glob_target); */
2162 return gr;
2163}
2164#endif
2165
wdenkc26e4542004-04-18 10:13:26 +00002166#ifdef __U_BOOT__
2167static char *get_dollar_var(char ch);
2168#endif
2169
wdenkfe8c2802002-11-03 00:38:21 +00002170/* This is used to get/check local shell variables */
Holger Brunckeae3b062011-04-08 02:47:42 +00002171char *get_local_var(const char *s)
wdenkfe8c2802002-11-03 00:38:21 +00002172{
2173 struct variables *cur;
2174
2175 if (!s)
2176 return NULL;
wdenkc26e4542004-04-18 10:13:26 +00002177
2178#ifdef __U_BOOT__
2179 if (*s == '$')
2180 return get_dollar_var(s[1]);
2181#endif
2182
wdenkfe8c2802002-11-03 00:38:21 +00002183 for (cur = top_vars; cur; cur=cur->next)
2184 if(strcmp(cur->name, s)==0)
2185 return cur->value;
2186 return NULL;
2187}
2188
2189/* This is used to set local shell variables
2190 flg_export==0 if only local (not exporting) variable
2191 flg_export==1 if "new" exporting environ
2192 flg_export>1 if current startup environ (not call putenv()) */
Heiko Schocher81473f62008-10-15 09:40:28 +02002193int set_local_var(const char *s, int flg_export)
wdenkfe8c2802002-11-03 00:38:21 +00002194{
2195 char *name, *value;
2196 int result=0;
2197 struct variables *cur;
2198
wdenkc26e4542004-04-18 10:13:26 +00002199#ifdef __U_BOOT__
2200 /* might be possible! */
2201 if (!isalpha(*s))
2202 return -1;
2203#endif
2204
wdenkfe8c2802002-11-03 00:38:21 +00002205 name=strdup(s);
2206
2207#ifdef __U_BOOT__
2208 if (getenv(name) != NULL) {
2209 printf ("ERROR: "
wdenk2d1a5372004-02-23 19:30:57 +00002210 "There is a global environment variable with the same name.\n");
wdenkc26e4542004-04-18 10:13:26 +00002211 free(name);
wdenkfe8c2802002-11-03 00:38:21 +00002212 return -1;
2213 }
2214#endif
2215 /* Assume when we enter this function that we are already in
2216 * NAME=VALUE format. So the first order of business is to
2217 * split 's' on the '=' into 'name' and 'value' */
2218 value = strchr(name, '=');
2219 if (value==0 && ++value==0) {
2220 free(name);
2221 return -1;
2222 }
2223 *value++ = 0;
2224
2225 for(cur = top_vars; cur; cur = cur->next) {
2226 if(strcmp(cur->name, name)==0)
2227 break;
2228 }
2229
2230 if(cur) {
2231 if(strcmp(cur->value, value)==0) {
2232 if(flg_export>0 && cur->flg_export==0)
2233 cur->flg_export=flg_export;
2234 else
2235 result++;
2236 } else {
2237 if(cur->flg_read_only) {
2238 error_msg("%s: readonly variable", name);
2239 result = -1;
2240 } else {
2241 if(flg_export>0 || cur->flg_export>1)
2242 cur->flg_export=1;
2243 free(cur->value);
2244
2245 cur->value = strdup(value);
2246 }
2247 }
2248 } else {
2249 cur = malloc(sizeof(struct variables));
2250 if(!cur) {
2251 result = -1;
2252 } else {
2253 cur->name = strdup(name);
2254 if(cur->name == 0) {
2255 free(cur);
2256 result = -1;
2257 } else {
2258 struct variables *bottom = top_vars;
2259 cur->value = strdup(value);
2260 cur->next = 0;
2261 cur->flg_export = flg_export;
2262 cur->flg_read_only = 0;
2263 while(bottom->next) bottom=bottom->next;
2264 bottom->next = cur;
2265 }
2266 }
2267 }
2268
2269#ifndef __U_BOOT__
2270 if(result==0 && cur->flg_export==1) {
2271 *(value-1) = '=';
2272 result = putenv(name);
2273 } else {
2274#endif
2275 free(name);
2276#ifndef __U_BOOT__
2277 if(result>0) /* equivalent to previous set */
2278 result = 0;
2279 }
2280#endif
2281 return result;
2282}
2283
Heiko Schocher81473f62008-10-15 09:40:28 +02002284void unset_local_var(const char *name)
wdenkfe8c2802002-11-03 00:38:21 +00002285{
2286 struct variables *cur;
2287
2288 if (name) {
2289 for (cur = top_vars; cur; cur=cur->next) {
2290 if(strcmp(cur->name, name)==0)
2291 break;
2292 }
2293 if(cur!=0) {
2294 struct variables *next = top_vars;
2295 if(cur->flg_read_only) {
2296 error_msg("%s: readonly variable", name);
2297 return;
2298 } else {
Heiko Schocher81473f62008-10-15 09:40:28 +02002299#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002300 if(cur->flg_export)
2301 unsetenv(cur->name);
Heiko Schocher81473f62008-10-15 09:40:28 +02002302#endif
wdenkfe8c2802002-11-03 00:38:21 +00002303 free(cur->name);
2304 free(cur->value);
2305 while (next->next != cur)
2306 next = next->next;
2307 next->next = cur->next;
2308 }
2309 free(cur);
2310 }
2311 }
2312}
wdenkfe8c2802002-11-03 00:38:21 +00002313
2314static int is_assignment(const char *s)
2315{
wdenkc26e4542004-04-18 10:13:26 +00002316 if (s == NULL)
2317 return 0;
2318
2319 if (!isalpha(*s)) return 0;
wdenkfe8c2802002-11-03 00:38:21 +00002320 ++s;
2321 while(isalnum(*s) || *s=='_') ++s;
2322 return *s=='=';
2323}
2324
2325#ifndef __U_BOOT__
2326/* the src parameter allows us to peek forward to a possible &n syntax
2327 * for file descriptor duplication, e.g., "2>&1".
2328 * Return code is 0 normally, 1 if a syntax error is detected in src.
2329 * Resource errors (in xmalloc) cause the process to exit */
2330static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
2331 struct in_str *input)
2332{
2333 struct child_prog *child=ctx->child;
2334 struct redir_struct *redir = child->redirects;
2335 struct redir_struct *last_redir=NULL;
2336
2337 /* Create a new redir_struct and drop it onto the end of the linked list */
2338 while(redir) {
2339 last_redir=redir;
2340 redir=redir->next;
2341 }
2342 redir = xmalloc(sizeof(struct redir_struct));
2343 redir->next=NULL;
2344 redir->word.gl_pathv=NULL;
2345 if (last_redir) {
2346 last_redir->next=redir;
2347 } else {
2348 child->redirects=redir;
2349 }
2350
2351 redir->type=style;
2352 redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
2353
2354 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
2355
2356 /* Check for a '2>&1' type redirect */
2357 redir->dup = redirect_dup_num(input);
2358 if (redir->dup == -2) return 1; /* syntax error */
2359 if (redir->dup != -1) {
2360 /* Erik had a check here that the file descriptor in question
2361 * is legit; I postpone that to "run time"
2362 * A "-" representation of "close me" shows up as a -3 here */
2363 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
2364 } else {
2365 /* We do _not_ try to open the file that src points to,
2366 * since we need to return and let src be expanded first.
2367 * Set ctx->pending_redirect, so we know what to do at the
2368 * end of the next parsed word.
2369 */
2370 ctx->pending_redirect = redir;
2371 }
2372 return 0;
2373}
2374#endif
2375
2376struct pipe *new_pipe(void) {
2377 struct pipe *pi;
2378 pi = xmalloc(sizeof(struct pipe));
2379 pi->num_progs = 0;
2380 pi->progs = NULL;
2381 pi->next = NULL;
2382 pi->followup = 0; /* invalid */
Wolfgang Denke98f68b2005-09-28 01:49:47 +02002383 pi->r_mode = RES_NONE;
wdenkfe8c2802002-11-03 00:38:21 +00002384 return pi;
2385}
2386
2387static void initialize_context(struct p_context *ctx)
2388{
2389 ctx->pipe=NULL;
2390#ifndef __U_BOOT__
2391 ctx->pending_redirect=NULL;
2392#endif
2393 ctx->child=NULL;
2394 ctx->list_head=new_pipe();
2395 ctx->pipe=ctx->list_head;
2396 ctx->w=RES_NONE;
2397 ctx->stack=NULL;
2398#ifdef __U_BOOT__
2399 ctx->old_flag=0;
2400#endif
2401 done_command(ctx); /* creates the memory for working child */
2402}
2403
2404/* normal return is 0
2405 * if a reserved word is found, and processed, return 1
2406 * should handle if, then, elif, else, fi, for, while, until, do, done.
2407 * case, function, and select are obnoxious, save those for later.
2408 */
wdenk3e386912003-04-05 00:53:31 +00002409struct reserved_combo {
2410 char *literal;
2411 int code;
2412 long flag;
2413};
2414/* Mostly a list of accepted follow-up reserved words.
2415 * FLAG_END means we are done with the sequence, and are ready
2416 * to turn the compound list into a command.
2417 * FLAG_START means the word must start a new compound list.
2418 */
2419static struct reserved_combo reserved_list[] = {
2420 { "if", RES_IF, FLAG_THEN | FLAG_START },
2421 { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
2422 { "elif", RES_ELIF, FLAG_THEN },
2423 { "else", RES_ELSE, FLAG_FI },
2424 { "fi", RES_FI, FLAG_END },
2425 { "for", RES_FOR, FLAG_IN | FLAG_START },
2426 { "while", RES_WHILE, FLAG_DO | FLAG_START },
2427 { "until", RES_UNTIL, FLAG_DO | FLAG_START },
2428 { "in", RES_IN, FLAG_DO },
2429 { "do", RES_DO, FLAG_DONE },
2430 { "done", RES_DONE, FLAG_END }
2431};
2432#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
2433
wdenkfe8c2802002-11-03 00:38:21 +00002434int reserved_word(o_string *dest, struct p_context *ctx)
2435{
wdenkfe8c2802002-11-03 00:38:21 +00002436 struct reserved_combo *r;
2437 for (r=reserved_list;
wdenkfe8c2802002-11-03 00:38:21 +00002438 r<reserved_list+NRES; r++) {
2439 if (strcmp(dest->data, r->literal) == 0) {
2440 debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
2441 if (r->flag & FLAG_START) {
2442 struct p_context *new = xmalloc(sizeof(struct p_context));
2443 debug_printf("push stack\n");
2444 if (ctx->w == RES_IN || ctx->w == RES_FOR) {
2445 syntax();
2446 free(new);
2447 ctx->w = RES_SNTX;
2448 b_reset(dest);
2449 return 1;
2450 }
2451 *new = *ctx; /* physical copy */
2452 initialize_context(ctx);
2453 ctx->stack=new;
2454 } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
2455 syntax();
2456 ctx->w = RES_SNTX;
2457 b_reset(dest);
2458 return 1;
2459 }
2460 ctx->w=r->code;
2461 ctx->old_flag = r->flag;
2462 if (ctx->old_flag & FLAG_END) {
2463 struct p_context *old;
2464 debug_printf("pop stack\n");
2465 done_pipe(ctx,PIPE_SEQ);
2466 old = ctx->stack;
2467 old->child->group = ctx->list_head;
2468#ifndef __U_BOOT__
2469 old->child->subshell = 0;
2470#endif
2471 *ctx = *old; /* physical copy */
2472 free(old);
2473 }
2474 b_reset (dest);
2475 return 1;
2476 }
2477 }
2478 return 0;
2479}
2480
2481/* normal return is 0.
2482 * Syntax or xglob errors return 1. */
2483static int done_word(o_string *dest, struct p_context *ctx)
2484{
2485 struct child_prog *child=ctx->child;
2486#ifndef __U_BOOT__
2487 glob_t *glob_target;
2488 int gr, flags = 0;
2489#else
2490 char *str, *s;
2491 int argc, cnt;
2492#endif
2493
2494 debug_printf("done_word: %s %p\n", dest->data, child);
2495 if (dest->length == 0 && !dest->nonnull) {
2496 debug_printf(" true null, ignored\n");
2497 return 0;
2498 }
2499#ifndef __U_BOOT__
2500 if (ctx->pending_redirect) {
2501 glob_target = &ctx->pending_redirect->word;
2502 } else {
2503#endif
2504 if (child->group) {
2505 syntax();
2506 return 1; /* syntax error, groups and arglists don't mix */
2507 }
2508 if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
2509 debug_printf("checking %s for reserved-ness\n",dest->data);
2510 if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
2511 }
2512#ifndef __U_BOOT__
2513 glob_target = &child->glob_result;
wdenk8bde7f72003-06-27 21:31:46 +00002514 if (child->argv) flags |= GLOB_APPEND;
wdenkfe8c2802002-11-03 00:38:21 +00002515#else
2516 for (cnt = 1, s = dest->data; s && *s; s++) {
2517 if (*s == '\\') s++;
2518 cnt++;
2519 }
2520 str = malloc(cnt);
2521 if (!str) return 1;
2522 if ( child->argv == NULL) {
2523 child->argc=0;
2524 }
2525 argc = ++child->argc;
2526 child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
2527 if (child->argv == NULL) return 1;
2528 child->argv[argc-1]=str;
2529 child->argv[argc]=NULL;
2530 for (s = dest->data; s && *s; s++,str++) {
2531 if (*s == '\\') s++;
2532 *str = *s;
2533 }
2534 *str = '\0';
2535#endif
2536#ifndef __U_BOOT__
2537 }
2538 gr = xglob(dest, flags, glob_target);
2539 if (gr != 0) return 1;
2540#endif
2541
2542 b_reset(dest);
2543#ifndef __U_BOOT__
2544 if (ctx->pending_redirect) {
2545 ctx->pending_redirect=NULL;
2546 if (glob_target->gl_pathc != 1) {
2547 error_msg("ambiguous redirect");
2548 return 1;
2549 }
2550 } else {
2551 child->argv = glob_target->gl_pathv;
2552 }
2553#endif
2554 if (ctx->w == RES_FOR) {
2555 done_word(dest,ctx);
2556 done_pipe(ctx,PIPE_SEQ);
2557 }
2558 return 0;
2559}
2560
2561/* The only possible error here is out of memory, in which case
2562 * xmalloc exits. */
2563static int done_command(struct p_context *ctx)
2564{
2565 /* The child is really already in the pipe structure, so
2566 * advance the pipe counter and make a new, null child.
2567 * Only real trickiness here is that the uncommitted
2568 * child structure, to which ctx->child points, is not
2569 * counted in pi->num_progs. */
2570 struct pipe *pi=ctx->pipe;
2571 struct child_prog *prog=ctx->child;
2572
2573 if (prog && prog->group == NULL
wdenk8bde7f72003-06-27 21:31:46 +00002574 && prog->argv == NULL
wdenkfe8c2802002-11-03 00:38:21 +00002575#ifndef __U_BOOT__
wdenk8bde7f72003-06-27 21:31:46 +00002576 && prog->redirects == NULL) {
wdenkfe8c2802002-11-03 00:38:21 +00002577#else
2578 ) {
2579#endif
2580 debug_printf("done_command: skipping null command\n");
2581 return 0;
2582 } else if (prog) {
2583 pi->num_progs++;
2584 debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
2585 } else {
2586 debug_printf("done_command: initializing\n");
2587 }
2588 pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
2589
2590 prog = pi->progs + pi->num_progs;
2591#ifndef __U_BOOT__
2592 prog->redirects = NULL;
2593#endif
2594 prog->argv = NULL;
2595#ifndef __U_BOOT__
2596 prog->is_stopped = 0;
2597#endif
2598 prog->group = NULL;
2599#ifndef __U_BOOT__
2600 prog->glob_result.gl_pathv = NULL;
2601 prog->family = pi;
2602#endif
2603 prog->sp = 0;
2604 ctx->child = prog;
2605 prog->type = ctx->type;
2606
2607 /* but ctx->pipe and ctx->list_head remain unchanged */
2608 return 0;
2609}
2610
2611static int done_pipe(struct p_context *ctx, pipe_style type)
2612{
2613 struct pipe *new_p;
2614 done_command(ctx); /* implicit closure of previous command */
2615 debug_printf("done_pipe, type %d\n", type);
2616 ctx->pipe->followup = type;
2617 ctx->pipe->r_mode = ctx->w;
2618 new_p=new_pipe();
2619 ctx->pipe->next = new_p;
2620 ctx->pipe = new_p;
2621 ctx->child = NULL;
2622 done_command(ctx); /* set up new pipe to accept commands */
2623 return 0;
2624}
2625
2626#ifndef __U_BOOT__
2627/* peek ahead in the in_str to find out if we have a "&n" construct,
2628 * as in "2>&1", that represents duplicating a file descriptor.
2629 * returns either -2 (syntax error), -1 (no &), or the number found.
2630 */
2631static int redirect_dup_num(struct in_str *input)
2632{
2633 int ch, d=0, ok=0;
2634 ch = b_peek(input);
2635 if (ch != '&') return -1;
2636
2637 b_getch(input); /* get the & */
2638 ch=b_peek(input);
2639 if (ch == '-') {
2640 b_getch(input);
2641 return -3; /* "-" represents "close me" */
2642 }
2643 while (isdigit(ch)) {
2644 d = d*10+(ch-'0');
2645 ok=1;
2646 b_getch(input);
2647 ch = b_peek(input);
2648 }
2649 if (ok) return d;
2650
2651 error_msg("ambiguous redirect");
2652 return -2;
2653}
2654
2655/* If a redirect is immediately preceded by a number, that number is
2656 * supposed to tell which file descriptor to redirect. This routine
2657 * looks for such preceding numbers. In an ideal world this routine
2658 * needs to handle all the following classes of redirects...
2659 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
2660 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
2661 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
2662 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
2663 * A -1 output from this program means no valid number was found, so the
2664 * caller should use the appropriate default for this redirection.
2665 */
2666static int redirect_opt_num(o_string *o)
2667{
2668 int num;
2669
2670 if (o->length==0) return -1;
2671 for(num=0; num<o->length; num++) {
2672 if (!isdigit(*(o->data+num))) {
2673 return -1;
2674 }
2675 }
2676 /* reuse num (and save an int) */
2677 num=atoi(o->data);
2678 b_reset(o);
2679 return num;
2680}
2681
2682FILE *generate_stream_from_list(struct pipe *head)
2683{
2684 FILE *pf;
2685#if 1
2686 int pid, channel[2];
2687 if (pipe(channel)<0) perror_msg_and_die("pipe");
2688 pid=fork();
2689 if (pid<0) {
2690 perror_msg_and_die("fork");
2691 } else if (pid==0) {
2692 close(channel[0]);
2693 if (channel[1] != 1) {
2694 dup2(channel[1],1);
2695 close(channel[1]);
2696 }
2697#if 0
2698#define SURROGATE "surrogate response"
2699 write(1,SURROGATE,sizeof(SURROGATE));
2700 _exit(run_list(head));
2701#else
2702 _exit(run_list_real(head)); /* leaks memory */
2703#endif
2704 }
2705 debug_printf("forked child %d\n",pid);
2706 close(channel[1]);
2707 pf = fdopen(channel[0],"r");
2708 debug_printf("pipe on FILE *%p\n",pf);
2709#else
2710 free_pipe_list(head,0);
2711 pf=popen("echo surrogate response","r");
2712 debug_printf("started fake pipe on FILE *%p\n",pf);
2713#endif
2714 return pf;
2715}
2716
2717/* this version hacked for testing purposes */
2718/* return code is exit status of the process that is run. */
2719static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
2720{
2721 int retcode;
2722 o_string result=NULL_O_STRING;
2723 struct p_context inner;
2724 FILE *p;
2725 struct in_str pipe_str;
2726 initialize_context(&inner);
2727
2728 /* recursion to generate command */
2729 retcode = parse_stream(&result, &inner, input, subst_end);
2730 if (retcode != 0) return retcode; /* syntax error or EOF */
2731 done_word(&result, &inner);
2732 done_pipe(&inner, PIPE_SEQ);
2733 b_free(&result);
2734
2735 p=generate_stream_from_list(inner.list_head);
2736 if (p==NULL) return 1;
2737 mark_open(fileno(p));
2738 setup_file_in_str(&pipe_str, p);
2739
2740 /* now send results of command back into original context */
2741 retcode = parse_stream(dest, ctx, &pipe_str, '\0');
2742 /* XXX In case of a syntax error, should we try to kill the child?
2743 * That would be tough to do right, so just read until EOF. */
2744 if (retcode == 1) {
2745 while (b_getch(&pipe_str)!=EOF) { /* discard */ };
2746 }
2747
2748 debug_printf("done reading from pipe, pclose()ing\n");
2749 /* This is the step that wait()s for the child. Should be pretty
2750 * safe, since we just read an EOF from its stdout. We could try
2751 * to better, by using wait(), and keeping track of background jobs
2752 * at the same time. That would be a lot of work, and contrary
2753 * to the KISS philosophy of this program. */
2754 mark_closed(fileno(p));
2755 retcode=pclose(p);
2756 free_pipe_list(inner.list_head,0);
2757 debug_printf("pclosed, retcode=%d\n",retcode);
2758 /* XXX this process fails to trim a single trailing newline */
2759 return retcode;
2760}
2761
2762static int parse_group(o_string *dest, struct p_context *ctx,
2763 struct in_str *input, int ch)
2764{
2765 int rcode, endch=0;
2766 struct p_context sub;
2767 struct child_prog *child = ctx->child;
2768 if (child->argv) {
2769 syntax();
2770 return 1; /* syntax error, groups and arglists don't mix */
2771 }
2772 initialize_context(&sub);
2773 switch(ch) {
2774 case '(': endch=')'; child->subshell=1; break;
2775 case '{': endch='}'; break;
2776 default: syntax(); /* really logic error */
2777 }
2778 rcode=parse_stream(dest,&sub,input,endch);
2779 done_word(dest,&sub); /* finish off the final word in the subcontext */
2780 done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
2781 child->group = sub.list_head;
2782 return rcode;
2783 /* child remains "open", available for possible redirects */
2784}
2785#endif
2786
2787/* basically useful version until someone wants to get fancier,
2788 * see the bash man page under "Parameter Expansion" */
2789static char *lookup_param(char *src)
2790{
wdenkc26e4542004-04-18 10:13:26 +00002791 char *p;
2792
2793 if (!src)
2794 return NULL;
2795
wdenkfe8c2802002-11-03 00:38:21 +00002796 p = getenv(src);
2797 if (!p)
2798 p = get_local_var(src);
wdenkc26e4542004-04-18 10:13:26 +00002799
wdenkfe8c2802002-11-03 00:38:21 +00002800 return p;
2801}
2802
wdenkc26e4542004-04-18 10:13:26 +00002803#ifdef __U_BOOT__
2804static char *get_dollar_var(char ch)
2805{
2806 static char buf[40];
2807
2808 buf[0] = '\0';
2809 switch (ch) {
2810 case '?':
2811 sprintf(buf, "%u", (unsigned int)last_return_code);
2812 break;
2813 default:
2814 return NULL;
2815 }
2816 return buf;
2817}
2818#endif
2819
wdenkfe8c2802002-11-03 00:38:21 +00002820/* return code: 0 for OK, 1 for syntax error */
2821static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
2822{
2823#ifndef __U_BOOT__
2824 int i, advance=0;
2825#else
2826 int advance=0;
2827#endif
2828#ifndef __U_BOOT__
2829 char sep[]=" ";
2830#endif
2831 int ch = input->peek(input); /* first character after the $ */
2832 debug_printf("handle_dollar: ch=%c\n",ch);
2833 if (isalpha(ch)) {
2834 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2835 ctx->child->sp++;
2836 while(ch=b_peek(input),isalnum(ch) || ch=='_') {
2837 b_getch(input);
2838 b_addchr(dest,ch);
2839 }
2840 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2841#ifndef __U_BOOT__
2842 } else if (isdigit(ch)) {
2843 i = ch-'0'; /* XXX is $0 special? */
2844 if (i<global_argc) {
2845 parse_string(dest, ctx, global_argv[i]); /* recursion */
2846 }
2847 advance = 1;
2848#endif
2849 } else switch (ch) {
2850#ifndef __U_BOOT__
2851 case '$':
2852 b_adduint(dest,getpid());
2853 advance = 1;
2854 break;
2855 case '!':
2856 if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
2857 advance = 1;
2858 break;
2859#endif
2860 case '?':
wdenkc26e4542004-04-18 10:13:26 +00002861#ifndef __U_BOOT__
wdenkfe8c2802002-11-03 00:38:21 +00002862 b_adduint(dest,last_return_code);
wdenkc26e4542004-04-18 10:13:26 +00002863#else
2864 ctx->child->sp++;
2865 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2866 b_addchr(dest, '$');
2867 b_addchr(dest, '?');
2868 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2869#endif
wdenkfe8c2802002-11-03 00:38:21 +00002870 advance = 1;
2871 break;
2872#ifndef __U_BOOT__
2873 case '#':
2874 b_adduint(dest,global_argc ? global_argc-1 : 0);
2875 advance = 1;
2876 break;
2877#endif
2878 case '{':
2879 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2880 ctx->child->sp++;
2881 b_getch(input);
2882 /* XXX maybe someone will try to escape the '}' */
2883 while(ch=b_getch(input),ch!=EOF && ch!='}') {
2884 b_addchr(dest,ch);
2885 }
2886 if (ch != '}') {
2887 syntax();
2888 return 1;
2889 }
2890 b_addchr(dest, SPECIAL_VAR_SYMBOL);
2891 break;
2892#ifndef __U_BOOT__
2893 case '(':
2894 b_getch(input);
2895 process_command_subs(dest, ctx, input, ')');
2896 break;
2897 case '*':
2898 sep[0]=ifs[0];
2899 for (i=1; i<global_argc; i++) {
2900 parse_string(dest, ctx, global_argv[i]);
2901 if (i+1 < global_argc) parse_string(dest, ctx, sep);
2902 }
2903 break;
2904 case '@':
2905 case '-':
2906 case '_':
2907 /* still unhandled, but should be eventually */
2908 error_msg("unhandled syntax: $%c",ch);
2909 return 1;
2910 break;
2911#endif
2912 default:
2913 b_addqchr(dest,'$',dest->quote);
2914 }
2915 /* Eat the character if the flag was set. If the compiler
2916 * is smart enough, we could substitute "b_getch(input);"
2917 * for all the "advance = 1;" above, and also end up with
2918 * a nice size-optimized program. Hah! That'll be the day.
2919 */
2920 if (advance) b_getch(input);
2921 return 0;
2922}
2923
2924#ifndef __U_BOOT__
2925int parse_string(o_string *dest, struct p_context *ctx, const char *src)
2926{
2927 struct in_str foo;
2928 setup_string_in_str(&foo, src);
2929 return parse_stream(dest, ctx, &foo, '\0');
2930}
2931#endif
2932
2933/* return code is 0 for normal exit, 1 for syntax error */
2934int parse_stream(o_string *dest, struct p_context *ctx,
2935 struct in_str *input, int end_trigger)
2936{
2937 unsigned int ch, m;
2938#ifndef __U_BOOT__
2939 int redir_fd;
2940 redir_type redir_style;
2941#endif
2942 int next;
2943
2944 /* Only double-quote state is handled in the state variable dest->quote.
2945 * A single-quote triggers a bypass of the main loop until its mate is
2946 * found. When recursing, quote state is passed in via dest->quote. */
2947
2948 debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
2949 while ((ch=b_getch(input))!=EOF) {
2950 m = map[ch];
2951#ifdef __U_BOOT__
2952 if (input->__promptme == 0) return 1;
2953#endif
2954 next = (ch == '\n') ? 0 : b_peek(input);
wdenkc26e4542004-04-18 10:13:26 +00002955
2956 debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
2957 ch >= ' ' ? ch : '.', ch, m,
2958 dest->quote, ctx->stack == NULL ? '*' : '.');
2959
wdenkfe8c2802002-11-03 00:38:21 +00002960 if (m==0 || ((m==1 || m==2) && dest->quote)) {
2961 b_addqchr(dest, ch, dest->quote);
2962 } else {
2963 if (m==2) { /* unquoted IFS */
2964 if (done_word(dest, ctx)) {
2965 return 1;
2966 }
2967 /* If we aren't performing a substitution, treat a newline as a
2968 * command separator. */
2969 if (end_trigger != '\0' && ch=='\n')
2970 done_pipe(ctx,PIPE_SEQ);
2971 }
2972 if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
2973 debug_printf("leaving parse_stream (triggered)\n");
2974 return 0;
2975 }
2976#if 0
2977 if (ch=='\n') {
2978 /* Yahoo! Time to run with it! */
2979 done_pipe(ctx,PIPE_SEQ);
2980 run_list(ctx->list_head);
2981 initialize_context(ctx);
2982 }
2983#endif
2984 if (m!=2) switch (ch) {
2985 case '#':
2986 if (dest->length == 0 && !dest->quote) {
2987 while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
2988 } else {
2989 b_addqchr(dest, ch, dest->quote);
2990 }
2991 break;
2992 case '\\':
2993 if (next == EOF) {
2994 syntax();
2995 return 1;
2996 }
2997 b_addqchr(dest, '\\', dest->quote);
2998 b_addqchr(dest, b_getch(input), dest->quote);
2999 break;
3000 case '$':
3001 if (handle_dollar(dest, ctx, input)!=0) return 1;
3002 break;
3003 case '\'':
3004 dest->nonnull = 1;
3005 while(ch=b_getch(input),ch!=EOF && ch!='\'') {
3006#ifdef __U_BOOT__
3007 if(input->__promptme == 0) return 1;
3008#endif
3009 b_addchr(dest,ch);
3010 }
3011 if (ch==EOF) {
3012 syntax();
3013 return 1;
3014 }
3015 break;
3016 case '"':
3017 dest->nonnull = 1;
3018 dest->quote = !dest->quote;
3019 break;
3020#ifndef __U_BOOT__
3021 case '`':
3022 process_command_subs(dest, ctx, input, '`');
3023 break;
3024 case '>':
3025 redir_fd = redirect_opt_num(dest);
3026 done_word(dest, ctx);
3027 redir_style=REDIRECT_OVERWRITE;
3028 if (next == '>') {
3029 redir_style=REDIRECT_APPEND;
3030 b_getch(input);
3031 } else if (next == '(') {
3032 syntax(); /* until we support >(list) Process Substitution */
3033 return 1;
3034 }
3035 setup_redirect(ctx, redir_fd, redir_style, input);
3036 break;
3037 case '<':
3038 redir_fd = redirect_opt_num(dest);
3039 done_word(dest, ctx);
3040 redir_style=REDIRECT_INPUT;
3041 if (next == '<') {
3042 redir_style=REDIRECT_HEREIS;
3043 b_getch(input);
3044 } else if (next == '>') {
3045 redir_style=REDIRECT_IO;
3046 b_getch(input);
3047 } else if (next == '(') {
3048 syntax(); /* until we support <(list) Process Substitution */
3049 return 1;
3050 }
3051 setup_redirect(ctx, redir_fd, redir_style, input);
3052 break;
3053#endif
3054 case ';':
3055 done_word(dest, ctx);
3056 done_pipe(ctx,PIPE_SEQ);
3057 break;
3058 case '&':
3059 done_word(dest, ctx);
3060 if (next=='&') {
3061 b_getch(input);
3062 done_pipe(ctx,PIPE_AND);
3063 } else {
3064#ifndef __U_BOOT__
3065 done_pipe(ctx,PIPE_BG);
3066#else
3067 syntax_err();
3068 return 1;
3069#endif
3070 }
3071 break;
3072 case '|':
3073 done_word(dest, ctx);
3074 if (next=='|') {
3075 b_getch(input);
3076 done_pipe(ctx,PIPE_OR);
3077 } else {
3078 /* we could pick up a file descriptor choice here
3079 * with redirect_opt_num(), but bash doesn't do it.
3080 * "echo foo 2| cat" yields "foo 2". */
3081#ifndef __U_BOOT__
3082 done_command(ctx);
3083#else
3084 syntax_err();
3085 return 1;
3086#endif
3087 }
3088 break;
3089#ifndef __U_BOOT__
3090 case '(':
3091 case '{':
3092 if (parse_group(dest, ctx, input, ch)!=0) return 1;
3093 break;
3094 case ')':
3095 case '}':
3096 syntax(); /* Proper use of this character caught by end_trigger */
3097 return 1;
3098 break;
3099#endif
3100 default:
3101 syntax(); /* this is really an internal logic error */
3102 return 1;
3103 }
3104 }
3105 }
3106 /* complain if quote? No, maybe we just finished a command substitution
3107 * that was quoted. Example:
3108 * $ echo "`cat foo` plus more"
3109 * and we just got the EOF generated by the subshell that ran "cat foo"
3110 * The only real complaint is if we got an EOF when end_trigger != '\0',
3111 * that is, we were really supposed to get end_trigger, and never got
3112 * one before the EOF. Can't use the standard "syntax error" return code,
3113 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
3114 debug_printf("leaving parse_stream (EOF)\n");
3115 if (end_trigger != '\0') return -1;
3116 return 0;
3117}
3118
3119void mapset(const unsigned char *set, int code)
3120{
3121 const unsigned char *s;
3122 for (s=set; *s; s++) map[*s] = code;
3123}
3124
3125void update_ifs_map(void)
3126{
3127 /* char *ifs and char map[256] are both globals. */
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003128 ifs = (uchar *)getenv("IFS");
3129 if (ifs == NULL) ifs=(uchar *)" \t\n";
wdenkfe8c2802002-11-03 00:38:21 +00003130 /* Precompute a list of 'flow through' behavior so it can be treated
3131 * quickly up front. Computation is necessary because of IFS.
3132 * Special case handling of IFS == " \t\n" is not implemented.
3133 * The map[] array only really needs two bits each, and on most machines
3134 * that would be faster because of the reduced L1 cache footprint.
3135 */
3136 memset(map,0,sizeof(map)); /* most characters flow through always */
3137#ifndef __U_BOOT__
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003138 mapset((uchar *)"\\$'\"`", 3); /* never flow through */
3139 mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003140#else
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003141 mapset((uchar *)"\\$'\"", 3); /* never flow through */
3142 mapset((uchar *)";&|#", 1); /* flow through if quoted */
wdenkfe8c2802002-11-03 00:38:21 +00003143#endif
3144 mapset(ifs, 2); /* also flow through if quoted */
3145}
3146
3147/* most recursion does not come through here, the exeception is
3148 * from builtin_source() */
3149int parse_stream_outer(struct in_str *inp, int flag)
3150{
3151
3152 struct p_context ctx;
3153 o_string temp=NULL_O_STRING;
3154 int rcode;
3155#ifdef __U_BOOT__
3156 int code = 0;
3157#endif
3158 do {
3159 ctx.type = flag;
3160 initialize_context(&ctx);
3161 update_ifs_map();
Wolfgang Denk77ddac92005-10-13 16:45:02 +02003162 if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
wdenkfe8c2802002-11-03 00:38:21 +00003163 inp->promptmode=1;
3164 rcode = parse_stream(&temp, &ctx, inp, '\n');
3165#ifdef __U_BOOT__
3166 if (rcode == 1) flag_repeat = 0;
3167#endif
3168 if (rcode != 1 && ctx.old_flag != 0) {
3169 syntax();
3170#ifdef __U_BOOT__
3171 flag_repeat = 0;
3172#endif
3173 }
3174 if (rcode != 1 && ctx.old_flag == 0) {
3175 done_word(&temp, &ctx);
3176 done_pipe(&ctx,PIPE_SEQ);
3177#ifndef __U_BOOT__
3178 run_list(ctx.list_head);
3179#else
wdenkc26e4542004-04-18 10:13:26 +00003180 code = run_list(ctx.list_head);
3181 if (code == -2) { /* exit */
3182 b_free(&temp);
3183 code = 0;
3184 /* XXX hackish way to not allow exit from main loop */
3185 if (inp->peek == file_peek) {
3186 printf("exit not allowed from main input shell.\n");
3187 continue;
3188 }
3189 break;
3190 }
3191 if (code == -1)
wdenkfe8c2802002-11-03 00:38:21 +00003192 flag_repeat = 0;
3193#endif
3194 } else {
3195 if (ctx.old_flag != 0) {
3196 free(ctx.stack);
3197 b_reset(&temp);
3198 }
3199#ifdef __U_BOOT__
3200 if (inp->__promptme == 0) printf("<INTERRUPT>\n");
3201 inp->__promptme = 1;
3202#endif
3203 temp.nonnull = 0;
3204 temp.quote = 0;
3205 inp->p = NULL;
3206 free_pipe_list(ctx.list_head,0);
3207 }
3208 b_free(&temp);
3209 } while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP)); /* loop on syntax errors, return on EOF */
3210#ifndef __U_BOOT__
3211 return 0;
3212#else
3213 return (code != 0) ? 1 : 0;
3214#endif /* __U_BOOT__ */
3215}
3216
3217#ifndef __U_BOOT__
3218static int parse_string_outer(const char *s, int flag)
3219#else
3220int parse_string_outer(char *s, int flag)
3221#endif /* __U_BOOT__ */
3222{
3223 struct in_str input;
3224#ifdef __U_BOOT__
3225 char *p = NULL;
3226 int rcode;
3227 if ( !s || !*s)
3228 return 1;
3229 if (!(p = strchr(s, '\n')) || *++p) {
3230 p = xmalloc(strlen(s) + 2);
3231 strcpy(p, s);
3232 strcat(p, "\n");
3233 setup_string_in_str(&input, p);
3234 rcode = parse_stream_outer(&input, flag);
3235 free(p);
3236 return rcode;
3237 } else {
3238#endif
3239 setup_string_in_str(&input, s);
3240 return parse_stream_outer(&input, flag);
3241#ifdef __U_BOOT__
3242 }
3243#endif
3244}
3245
3246#ifndef __U_BOOT__
3247static int parse_file_outer(FILE *f)
3248#else
3249int parse_file_outer(void)
3250#endif
3251{
3252 int rcode;
3253 struct in_str input;
3254#ifndef __U_BOOT__
3255 setup_file_in_str(&input, f);
3256#else
3257 setup_file_in_str(&input);
3258#endif
3259 rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
3260 return rcode;
3261}
3262
3263#ifdef __U_BOOT__
Wolfgang Denk2e5167c2010-10-28 20:00:11 +02003264#ifdef CONFIG_NEEDS_MANUAL_RELOC
wdenk3e386912003-04-05 00:53:31 +00003265static void u_boot_hush_reloc(void)
3266{
wdenk3e386912003-04-05 00:53:31 +00003267 unsigned long addr;
3268 struct reserved_combo *r;
3269
3270 for (r=reserved_list; r<reserved_list+NRES; r++) {
3271 addr = (ulong) (r->literal) + gd->reloc_off;
3272 r->literal = (char *)addr;
3273 }
3274}
Peter Tyser521af042009-09-21 11:20:36 -05003275#endif
wdenk3e386912003-04-05 00:53:31 +00003276
wdenkfe8c2802002-11-03 00:38:21 +00003277int u_boot_hush_start(void)
3278{
wdenk2d5b5612003-10-14 19:43:55 +00003279 if (top_vars == NULL) {
3280 top_vars = malloc(sizeof(struct variables));
3281 top_vars->name = "HUSH_VERSION";
3282 top_vars->value = "0.01";
3283 top_vars->next = 0;
3284 top_vars->flg_export = 0;
3285 top_vars->flg_read_only = 1;
Wolfgang Denk2e5167c2010-10-28 20:00:11 +02003286#ifdef CONFIG_NEEDS_MANUAL_RELOC
wdenk2d5b5612003-10-14 19:43:55 +00003287 u_boot_hush_reloc();
Peter Tyser521af042009-09-21 11:20:36 -05003288#endif
wdenk2d5b5612003-10-14 19:43:55 +00003289 }
wdenkfe8c2802002-11-03 00:38:21 +00003290 return 0;
3291}
3292
3293static void *xmalloc(size_t size)
3294{
3295 void *p = NULL;
3296
3297 if (!(p = malloc(size))) {
3298 printf("ERROR : memory not allocated\n");
3299 for(;;);
3300 }
3301 return p;
3302}
3303
3304static void *xrealloc(void *ptr, size_t size)
3305{
3306 void *p = NULL;
3307
3308 if (!(p = realloc(ptr, size))) {
3309 printf("ERROR : memory not allocated\n");
3310 for(;;);
3311 }
3312 return p;
3313}
3314#endif /* __U_BOOT__ */
3315
3316#ifndef __U_BOOT__
3317/* Make sure we have a controlling tty. If we get started under a job
3318 * aware app (like bash for example), make sure we are now in charge so
3319 * we don't fight over who gets the foreground */
wdenkd0fb80c2003-01-11 09:48:40 +00003320static void setup_job_control(void)
wdenkfe8c2802002-11-03 00:38:21 +00003321{
3322 static pid_t shell_pgrp;
3323 /* Loop until we are in the foreground. */
3324 while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
3325 kill (- shell_pgrp, SIGTTIN);
3326
3327 /* Ignore interactive and job-control signals. */
3328 signal(SIGINT, SIG_IGN);
3329 signal(SIGQUIT, SIG_IGN);
3330 signal(SIGTERM, SIG_IGN);
3331 signal(SIGTSTP, SIG_IGN);
3332 signal(SIGTTIN, SIG_IGN);
3333 signal(SIGTTOU, SIG_IGN);
3334 signal(SIGCHLD, SIG_IGN);
3335
3336 /* Put ourselves in our own process group. */
3337 setsid();
3338 shell_pgrp = getpid ();
3339 setpgid (shell_pgrp, shell_pgrp);
3340
3341 /* Grab control of the terminal. */
3342 tcsetpgrp(shell_terminal, shell_pgrp);
3343}
3344
Wolfgang Denk54841ab2010-06-28 22:00:46 +02003345int hush_main(int argc, char * const *argv)
wdenkfe8c2802002-11-03 00:38:21 +00003346{
3347 int opt;
3348 FILE *input;
3349 char **e = environ;
3350
3351 /* XXX what should these be while sourcing /etc/profile? */
3352 global_argc = argc;
3353 global_argv = argv;
3354
3355 /* (re?) initialize globals. Sometimes hush_main() ends up calling
3356 * hush_main(), therefore we cannot rely on the BSS to zero out this
3357 * stuff. Reset these to 0 every time. */
3358 ifs = NULL;
3359 /* map[] is taken care of with call to update_ifs_map() */
3360 fake_mode = 0;
3361 interactive = 0;
3362 close_me_head = NULL;
3363 last_bg_pid = 0;
3364 job_list = NULL;
3365 last_jobid = 0;
3366
3367 /* Initialize some more globals to non-zero values */
3368 set_cwd();
wdenkd0fb80c2003-01-11 09:48:40 +00003369#ifdef CONFIG_FEATURE_COMMAND_EDITING
wdenkfe8c2802002-11-03 00:38:21 +00003370 cmdedit_set_initial_prompt();
3371#else
3372 PS1 = NULL;
3373#endif
3374 PS2 = "> ";
3375
3376 /* initialize our shell local variables with the values
3377 * currently living in the environment */
3378 if (e) {
3379 for (; *e; e++)
3380 set_local_var(*e, 2); /* without call putenv() */
3381 }
3382
3383 last_return_code=EXIT_SUCCESS;
3384
3385
3386 if (argv[0] && argv[0][0] == '-') {
3387 debug_printf("\nsourcing /etc/profile\n");
3388 if ((input = fopen("/etc/profile", "r")) != NULL) {
3389 mark_open(fileno(input));
3390 parse_file_outer(input);
3391 mark_closed(fileno(input));
3392 fclose(input);
3393 }
3394 }
3395 input=stdin;
3396
3397 while ((opt = getopt(argc, argv, "c:xif")) > 0) {
3398 switch (opt) {
3399 case 'c':
3400 {
3401 global_argv = argv+optind;
3402 global_argc = argc-optind;
3403 opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
3404 goto final_return;
3405 }
3406 break;
3407 case 'i':
3408 interactive++;
3409 break;
3410 case 'f':
3411 fake_mode++;
3412 break;
3413 default:
3414#ifndef BB_VER
3415 fprintf(stderr, "Usage: sh [FILE]...\n"
3416 " or: sh -c command [args]...\n\n");
3417 exit(EXIT_FAILURE);
3418#else
3419 show_usage();
3420#endif
3421 }
3422 }
3423 /* A shell is interactive if the `-i' flag was given, or if all of
3424 * the following conditions are met:
3425 * no -c command
3426 * no arguments remaining or the -s flag given
3427 * standard input is a terminal
3428 * standard output is a terminal
3429 * Refer to Posix.2, the description of the `sh' utility. */
3430 if (argv[optind]==NULL && input==stdin &&
3431 isatty(fileno(stdin)) && isatty(fileno(stdout))) {
3432 interactive++;
3433 }
3434
3435 debug_printf("\ninteractive=%d\n", interactive);
3436 if (interactive) {
3437 /* Looks like they want an interactive shell */
wdenk8bde7f72003-06-27 21:31:46 +00003438#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
wdenkd0fb80c2003-01-11 09:48:40 +00003439 printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
3440 printf( "Enter 'help' for a list of built-in commands.\n\n");
3441#endif
wdenkfe8c2802002-11-03 00:38:21 +00003442 setup_job_control();
3443 }
3444
3445 if (argv[optind]==NULL) {
3446 opt=parse_file_outer(stdin);
3447 goto final_return;
3448 }
3449
3450 debug_printf("\nrunning script '%s'\n", argv[optind]);
3451 global_argv = argv+optind;
3452 global_argc = argc-optind;
3453 input = xfopen(argv[optind], "r");
3454 opt = parse_file_outer(input);
3455
wdenkd0fb80c2003-01-11 09:48:40 +00003456#ifdef CONFIG_FEATURE_CLEAN_UP
wdenkfe8c2802002-11-03 00:38:21 +00003457 fclose(input);
3458 if (cwd && cwd != unknown)
3459 free((char*)cwd);
3460 {
3461 struct variables *cur, *tmp;
3462 for(cur = top_vars; cur; cur = tmp) {
3463 tmp = cur->next;
3464 if (!cur->flg_read_only) {
3465 free(cur->name);
3466 free(cur->value);
3467 free(cur);
3468 }
3469 }
3470 }
3471#endif
3472
3473final_return:
3474 return(opt?opt:last_return_code);
3475}
3476#endif
3477
3478static char *insert_var_value(char *inp)
3479{
3480 int res_str_len = 0;
3481 int len;
3482 int done = 0;
3483 char *p, *p1, *res_str = NULL;
3484
3485 while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
3486 if (p != inp) {
3487 len = p - inp;
3488 res_str = xrealloc(res_str, (res_str_len + len));
3489 strncpy((res_str + res_str_len), inp, len);
3490 res_str_len += len;
3491 }
3492 inp = ++p;
3493 p = strchr(inp, SPECIAL_VAR_SYMBOL);
3494 *p = '\0';
3495 if ((p1 = lookup_param(inp))) {
3496 len = res_str_len + strlen(p1);
3497 res_str = xrealloc(res_str, (1 + len));
3498 strcpy((res_str + res_str_len), p1);
3499 res_str_len = len;
3500 }
3501 *p = SPECIAL_VAR_SYMBOL;
3502 inp = ++p;
3503 done = 1;
3504 }
3505 if (done) {
3506 res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
3507 strcpy((res_str + res_str_len), inp);
3508 while ((p = strchr(res_str, '\n'))) {
3509 *p = ' ';
3510 }
3511 }
3512 return (res_str == NULL) ? inp : res_str;
3513}
3514
3515static char **make_list_in(char **inp, char *name)
3516{
3517 int len, i;
3518 int name_len = strlen(name);
3519 int n = 0;
3520 char **list;
3521 char *p1, *p2, *p3;
3522
3523 /* create list of variable values */
3524 list = xmalloc(sizeof(*list));
3525 for (i = 0; inp[i]; i++) {
3526 p3 = insert_var_value(inp[i]);
3527 p1 = p3;
3528 while (*p1) {
3529 if ((*p1 == ' ')) {
3530 p1++;
3531 continue;
3532 }
3533 if ((p2 = strchr(p1, ' '))) {
3534 len = p2 - p1;
3535 } else {
3536 len = strlen(p1);
3537 p2 = p1 + len;
3538 }
3539 /* we use n + 2 in realloc for list,because we add
3540 * new element and then we will add NULL element */
3541 list = xrealloc(list, sizeof(*list) * (n + 2));
3542 list[n] = xmalloc(2 + name_len + len);
3543 strcpy(list[n], name);
3544 strcat(list[n], "=");
3545 strncat(list[n], p1, len);
3546 list[n++][name_len + len + 1] = '\0';
3547 p1 = p2;
3548 }
3549 if (p3 != inp[i]) free(p3);
3550 }
3551 list[n] = NULL;
3552 return list;
3553}
3554
3555/* Make new string for parser */
3556static char * make_string(char ** inp)
3557{
3558 char *p;
3559 char *str = NULL;
3560 int n;
3561 int len = 2;
3562
3563 for (n = 0; inp[n]; n++) {
3564 p = insert_var_value(inp[n]);
3565 str = xrealloc(str, (len + strlen(p)));
3566 if (n) {
3567 strcat(str, " ");
3568 } else {
3569 *str = '\0';
3570 }
3571 strcat(str, p);
3572 len = strlen(str) + 3;
3573 if (p != inp[n]) free(p);
3574 }
3575 len = strlen(str);
3576 *(str + len) = '\n';
3577 *(str + len + 1) = '\0';
3578 return str;
3579}
3580
Heiko Schocher81473f62008-10-15 09:40:28 +02003581#ifdef __U_BOOT__
Wolfgang Denk54841ab2010-06-28 22:00:46 +02003582int do_showvar (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
Heiko Schocher81473f62008-10-15 09:40:28 +02003583{
3584 int i, k;
3585 int rcode = 0;
3586 struct variables *cur;
3587
3588 if (argc == 1) { /* Print all env variables */
3589 for (cur = top_vars; cur; cur = cur->next) {
3590 printf ("%s=%s\n", cur->name, cur->value);
3591 if (ctrlc ()) {
3592 puts ("\n ** Abort\n");
3593 return 1;
3594 }
3595 }
3596 return 0;
3597 }
3598 for (i = 1; i < argc; ++i) { /* print single env variables */
3599 char *name = argv[i];
3600
3601 k = -1;
3602 for (cur = top_vars; cur; cur = cur->next) {
3603 if(strcmp (cur->name, name) == 0) {
3604 k = 0;
3605 printf ("%s=%s\n", cur->name, cur->value);
3606 }
3607 if (ctrlc ()) {
3608 puts ("\n ** Abort\n");
3609 return 1;
3610 }
3611 }
3612 if (k < 0) {
3613 printf ("## Error: \"%s\" not defined\n", name);
3614 rcode ++;
3615 }
3616 }
3617 return rcode;
3618}
3619
3620U_BOOT_CMD(
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003621 showvar, CONFIG_SYS_MAXARGS, 1, do_showvar,
Peter Tyser2fb26042009-01-27 18:03:12 -06003622 "print local hushshell variables",
Heiko Schocher81473f62008-10-15 09:40:28 +02003623 "\n - print values of all hushshell variables\n"
3624 "showvar name ...\n"
Wolfgang Denka89c33d2009-05-24 17:06:54 +02003625 " - print value of hushshell variable 'name'"
Heiko Schocher81473f62008-10-15 09:40:28 +02003626);
3627
3628#endif
wdenkfe8c2802002-11-03 00:38:21 +00003629/****************************************************************************/