Add in xargs
diff --git a/xargs.c b/xargs.c
new file mode 100644
index 0000000..73b1a02
--- /dev/null
+++ b/xargs.c
@@ -0,0 +1,922 @@
+/* xargs for busybox */
+
+/* xargs -- build and execute command lines from standard input
+ Copyright (C) 1990, 91, 92, 93, 94 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Written by Mike Rendell <michael@cs.mun.ca>
+ and David MacKenzie <djm@gnu.ai.mit.edu>. */
+
+#include "internal.h"
+
+#define HAVE_STRING_H 1
+#define HAVE_SYS_WAIT_H 1
+#define HAVE_UNISTD_H 1
+#define HAVE_LIMITS_H 1
+#define STDC_HEADERS 1
+
+#include <sys/types.h> /* For pid_t. */
+#if HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+
+#ifndef WIFSTOPPED
+#define WIFSTOPPED(w) (((w) & 0xff) == 0x7f)
+#endif
+#ifndef WIFSIGNALED
+#define WIFSIGNALED(w) (((w) & 0xff) != 0x7f && ((w) & 0xff) != 0)
+#endif
+#ifndef WIFEXITED
+#define WIFEXITED(w) (((w) & 0xff) == 0)
+#endif
+
+#ifndef WSTOPSIG
+#define WSTOPSIG(w) (((w) >> 8) & 0xff)
+#endif
+#ifndef WTERMSIG
+#define WTERMSIG(w) ((w) & 0x7f)
+#endif
+#ifndef WEXITSTATUS
+#define WEXITSTATUS(w) (((w) >> 8) & 0xff)
+#endif
+
+#if __STDC__
+#define P_(s) s
+#else
+#define P_(s) ()
+#endif
+
+#include <ctype.h>
+
+#if !defined (isascii) || defined (STDC_HEADERS)
+#ifdef isascii
+#undef isascii
+#endif
+#define isascii(c) 1
+#endif
+
+#ifdef isblank
+#define ISBLANK(c) (isascii (c) && isblank (c))
+#else
+#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
+#endif
+
+#define ISSPACE(c) (ISBLANK (c) || (c) == '\n' || (c) == '\r' \
+ || (c) == '\f' || (c) == '\v')
+
+#include <stdio.h>
+#include <errno.h>
+#include <getopt.h>
+
+#if defined(HAVE_STRING_H) || defined(STDC_HEADERS)
+#include <string.h>
+#if !defined(STDC_HEADERS)
+#include <memory.h>
+#endif
+#else
+#include <strings.h>
+#define memcpy(dest, source, count) (bcopy((source), (dest), (count)))
+#endif
+
+#ifndef _POSIX_SOURCE
+#include <sys/param.h>
+#endif
+
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#endif
+
+#ifndef LONG_MAX
+#define LONG_MAX (~(1 << (sizeof (long) * 8 - 1)))
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include <signal.h>
+
+#if !defined(SIGCHLD) && defined(SIGCLD)
+#define SIGCHLD SIGCLD
+#endif
+
+/* COMPAT: SYSV version defaults size (and has a max value of) to 470.
+ We try to make it as large as possible. */
+#if !defined(ARG_MAX) && defined(_SC_ARG_MAX)
+#define ARG_MAX sysconf (_SC_ARG_MAX)
+#endif
+#ifndef ARG_MAX
+#define ARG_MAX NCARGS
+#endif
+
+/* States for read_line. */
+#define NORM 0
+#define SPACE 1
+#define QUOTE 2
+#define BACKSLASH 3
+
+#ifdef STDC_HEADERS
+#include <stdlib.h>
+#else
+extern int errno;
+#endif
+
+/* Return nonzero if S is the EOF string. */
+#define EOF_STR(s) (eof_str && *eof_str == *s && !strcmp (eof_str, s))
+
+extern char **environ;
+
+/* Not char because of type promotion; NeXT gcc can't handle it. */
+typedef int boolean;
+#define true 1
+#define false 0
+
+#if __STDC__
+#define VOID void
+#else
+#define VOID char
+#endif
+
+VOID *xmalloc P_ ((size_t n));
+VOID *xrealloc P_ ((VOID * p, size_t n));
+
+/* The name this program was run with. */
+char *program_name;
+
+/* Buffer for reading arguments from stdin. */
+static char *linebuf;
+
+/* Line number in stdin since the last command was executed. */
+static int lineno = 0;
+
+/* If nonzero, then instead of putting the args from stdin at
+ the end of the command argument list, they are each stuck into the
+ initial args, replacing each occurrence of the `replace_pat' in the
+ initial args. */
+static char *replace_pat = NULL;
+
+/* The length of `replace_pat'. */
+static size_t rplen = 0;
+
+/* If nonzero, when this string is read on stdin it is treated as
+ end of file.
+ I don't like this - it should default to NULL. */
+static char *eof_str = "_";
+
+/* If nonzero, the maximum number of nonblank lines from stdin to use
+ per command line. */
+static long lines_per_exec = 0;
+
+/* The maximum number of arguments to use per command line. */
+static long args_per_exec = 1024;
+
+/* If true, exit if lines_per_exec or args_per_exec is exceeded. */
+static boolean exit_if_size_exceeded = false;
+
+/* The maximum number of characters that can be used per command line. */
+static long arg_max;
+
+/* Storage for elements of `cmd_argv'. */
+static char *argbuf;
+
+/* The list of args being built. */
+static char **cmd_argv = NULL;
+
+/* Number of elements allocated for `cmd_argv'. */
+static int cmd_argv_alloc = 0;
+
+/* Number of valid elements in `cmd_argv'. */
+static int cmd_argc = 0;
+
+/* Number of chars being used in `cmd_argv'. */
+static int cmd_argv_chars = 0;
+
+/* Number of initial arguments given on the command line. */
+static int initial_argc = 0;
+
+/* Number of chars in the initial args. */
+static int initial_argv_chars = 0;
+
+/* true when building up initial arguments in `cmd_argv'. */
+static boolean initial_args = true;
+
+/* If nonzero, the maximum number of child processes that can be running
+ at once. */
+static int proc_max = 1;
+
+/* Total number of child processes that have been executed. */
+static int procs_executed = 0;
+
+/* The number of elements in `pids'. */
+static int procs_executing = 0;
+
+/* List of child processes currently executing. */
+static pid_t *pids = NULL;
+
+/* The number of allocated elements in `pids'. */
+static int pids_alloc = 0;
+
+/* Exit status; nonzero if any child process exited with a
+ status of 1-125. */
+static int child_error = 0;
+
+/* If true, print each command on stderr before executing it. */
+static boolean print_command = false;
+
+/* If true, query the user before executing each command, and only
+ execute the command if the user responds affirmatively. */
+static boolean query_before_executing = false;
+
+static struct option const longopts[] =
+{
+ {"null", no_argument, NULL, '0'},
+ {"eof", optional_argument, NULL, 'e'},
+ {"replace", optional_argument, NULL, 'i'},
+ {"max-lines", optional_argument, NULL, 'l'},
+ {"max-args", required_argument, NULL, 'n'},
+ {"interactive", no_argument, NULL, 'p'},
+ {"no-run-if-empty", no_argument, NULL, 'r'},
+ {"max-chars", required_argument, NULL, 's'},
+ {"verbose", no_argument, NULL, 't'},
+ {"exit", no_argument, NULL, 'x'},
+ {"max-procs", required_argument, NULL, 'P'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, no_argument, NULL, 0}
+};
+
+static int read_line P_ ((void));
+static int read_string P_ ((void));
+static void do_insert P_ ((char *arg, size_t arglen, size_t lblen));
+static void push_arg P_ ((char *arg, size_t len));
+static boolean print_args P_ ((boolean ask));
+static void do_exec P_ ((void));
+static void add_proc P_ ((pid_t pid));
+static void wait_for_proc P_ ((boolean all));
+static long parse_num P_ ((char *str, int option, long min, long max));
+static long env_size P_ ((char **envp));
+
+int xargs_main (argc, argv)
+ int argc;
+ char **argv;
+{
+ int optc;
+ int always_run_command = 1;
+ long orig_arg_max;
+ char *default_cmd = "/bin/echo";
+ int (*read_args) P_ ((void)) = read_line;
+
+ program_name = argv[0];
+
+ orig_arg_max = ARG_MAX;
+ if (orig_arg_max == -1)
+ orig_arg_max = LONG_MAX;
+ orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048. */
+ arg_max = orig_arg_max;
+
+ /* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
+ have it at 1 meg). Things will work fine with a large ARG_MAX but it
+ will probably hurt the system more than it needs to; an array of this
+ size is allocated. */
+ if (arg_max > 20 * 1024)
+ arg_max = 20 * 1024;
+
+ /* Take the size of the environment into account. */
+ arg_max -= env_size (environ);
+ if (arg_max <= 0)
+ fatalError("environment is too large for exec");
+
+ while ((optc = getopt_long (argc, argv, "+0e::i::l::n:prs:txP:",
+ longopts, (int *) 0)) != -1)
+ {
+ switch (optc)
+ {
+ case '0':
+ read_args = read_string;
+ break;
+
+ case 'e':
+ if (optarg)
+ eof_str = optarg;
+ else
+ eof_str = 0;
+ break;
+
+ case 'h':
+ usage (xargs_usage);
+
+ case 'i':
+ if (optarg)
+ replace_pat = optarg;
+ else
+ replace_pat = "{}";
+ /* -i excludes -n -l. */
+ args_per_exec = 0;
+ lines_per_exec = 0;
+ break;
+
+ case 'l':
+ if (optarg)
+ lines_per_exec = parse_num (optarg, 'l', 1L, -1L);
+ else
+ lines_per_exec = 1;
+ /* -l excludes -i -n. */
+ args_per_exec = 0;
+ replace_pat = NULL;
+ break;
+
+ case 'n':
+ args_per_exec = parse_num (optarg, 'n', 1L, -1L);
+ /* -n excludes -i -l. */
+ lines_per_exec = 0;
+ replace_pat = NULL;
+ break;
+
+ case 's':
+ arg_max = parse_num (optarg, 's', 1L, orig_arg_max);
+ break;
+
+ case 't':
+ print_command = true;
+ break;
+
+ case 'x':
+ exit_if_size_exceeded = true;
+ break;
+
+ case 'p':
+ query_before_executing = true;
+ print_command = true;
+ break;
+
+ case 'r':
+ always_run_command = 0;
+ break;
+
+ case 'P':
+ proc_max = parse_num (optarg, 'P', 0L, -1L);
+ break;
+
+ default:
+ usage (xargs_usage);
+ }
+ }
+
+ if (replace_pat || lines_per_exec)
+ exit_if_size_exceeded = true;
+
+ if (optind == argc)
+ {
+ optind = 0;
+ argc = 1;
+ argv = &default_cmd;
+ }
+
+ linebuf = (char *) xmalloc (arg_max + 1);
+ argbuf = (char *) xmalloc (arg_max + 1);
+
+ /* Make sure to listen for the kids. */
+ signal (SIGCHLD, SIG_DFL);
+
+ if (!replace_pat)
+ {
+ for (; optind < argc; optind++)
+ push_arg (argv[optind], strlen (argv[optind]) + 1);
+ initial_args = false;
+ initial_argc = cmd_argc;
+ initial_argv_chars = cmd_argv_chars;
+
+ while ((*read_args) () != -1)
+ if (lines_per_exec && lineno >= lines_per_exec)
+ {
+ do_exec ();
+ lineno = 0;
+ }
+
+ /* SYSV xargs seems to do at least one exec, even if the
+ input is empty. */
+ if (cmd_argc != initial_argc
+ || (always_run_command && procs_executed == 0))
+ do_exec ();
+ }
+ else
+ {
+ int i;
+ size_t len;
+ size_t *arglen = (size_t *) xmalloc (sizeof (size_t) * argc);
+
+ for (i = optind; i < argc; i++)
+ arglen[i] = strlen(argv[i]);
+ rplen = strlen (replace_pat);
+ while ((len = (*read_args) ()) != -1)
+ {
+ /* Don't do insert on the command name. */
+ push_arg (argv[optind], arglen[optind] + 1);
+ len--;
+ for (i = optind + 1; i < argc; i++)
+ do_insert (argv[i], arglen[i], len);
+ do_exec ();
+ }
+ }
+
+ wait_for_proc (true);
+ exit (child_error);
+}
+
+/* Read a line of arguments from stdin and add them to the list of
+ arguments to pass to the command. Ignore blank lines and initial blanks.
+ Single and double quotes and backslashes quote metacharacters and blanks
+ as they do in the shell.
+ Return -1 if eof (either physical or logical) is reached,
+ otherwise the length of the last string read (including the null). */
+
+static int
+read_line ()
+{
+ static boolean eof = false;
+ /* Start out in mode SPACE to always strip leading spaces (even with -i). */
+ int state = SPACE; /* The type of character we last read. */
+ int prevc; /* The previous value of c. */
+ int quotc = 0; /* The last quote character read. */
+ int c = EOF;
+ boolean first = true; /* true if reading first arg on line. */
+ int len;
+ char *p = linebuf;
+ /* Including the NUL, the args must not grow past this point. */
+ char *endbuf = linebuf + arg_max - initial_argv_chars - 1;
+
+ if (eof)
+ return -1;
+ while (1)
+ {
+ prevc = c;
+ c = getc (stdin);
+ if (c == EOF)
+ {
+ /* COMPAT: SYSV seems to ignore stuff on a line that
+ ends without a \n; we don't. */
+ eof = true;
+ if (p == linebuf)
+ return -1;
+ *p++ = '\0';
+ len = p - linebuf;
+ /* FIXME we don't check for unterminated quotes here. */
+ if (first && EOF_STR (linebuf))
+ return -1;
+ if (!replace_pat)
+ push_arg (linebuf, len);
+ return len;
+ }
+ switch (state)
+ {
+ case SPACE:
+ if (ISSPACE (c))
+ continue;
+ state = NORM;
+ /* aaahhhh.... */
+
+ case NORM:
+ if (c == '\n')
+ {
+ if (!ISBLANK (prevc))
+ lineno++; /* For -l. */
+ if (p == linebuf)
+ {
+ /* Blank line. */
+ state = SPACE;
+ continue;
+ }
+ *p++ = '\0';
+ len = p - linebuf;
+ if (EOF_STR (linebuf))
+ {
+ eof = true;
+ return first ? -1 : len;
+ }
+ if (!replace_pat)
+ push_arg (linebuf, len);
+ return len;
+ }
+ if (!replace_pat && ISSPACE (c))
+ {
+ *p++ = '\0';
+ len = p - linebuf;
+ if (EOF_STR (linebuf))
+ {
+ eof = true;
+ return first ? -1 : len;
+ }
+ push_arg (linebuf, len);
+ p = linebuf;
+ state = SPACE;
+ first = false;
+ continue;
+ }
+ switch (c)
+ {
+ case '\\':
+ state = BACKSLASH;
+ continue;
+
+ case '\'':
+ case '"':
+ state = QUOTE;
+ quotc = c;
+ continue;
+ }
+ break;
+
+ case QUOTE:
+ if (c == '\n')
+ fatalError ("unmatched %s quote", quotc == '"' ? "double" : "single");
+ if (c == quotc)
+ {
+ state = NORM;
+ continue;
+ }
+ break;
+
+ case BACKSLASH:
+ state = NORM;
+ break;
+ }
+ if (p >= endbuf)
+ fatalError ("argument line too long");
+ *p++ = c;
+ }
+}
+
+/* Read a null-terminated string from stdin and add it to the list of
+ arguments to pass to the command.
+ Return -1 if eof (either physical or logical) is reached,
+ otherwise the length of the string read (including the null). */
+
+static int
+read_string ()
+{
+ static boolean eof = false;
+ int len;
+ char *p = linebuf;
+ /* Including the NUL, the args must not grow past this point. */
+ char *endbuf = linebuf + arg_max - initial_argv_chars - 1;
+
+ if (eof)
+ return -1;
+ while (1)
+ {
+ int c = getc (stdin);
+ if (c == EOF)
+ {
+ eof = true;
+ if (p == linebuf)
+ return -1;
+ *p++ = '\0';
+ len = p - linebuf;
+ if (!replace_pat)
+ push_arg (linebuf, len);
+ return len;
+ }
+ if (c == '\0')
+ {
+ lineno++; /* For -l. */
+ *p++ = '\0';
+ len = p - linebuf;
+ if (!replace_pat)
+ push_arg (linebuf, len);
+ return len;
+ }
+ if (p >= endbuf)
+ fatalError ("argument line too long");
+ *p++ = c;
+ }
+}
+
+/* Replace all instances of `replace_pat' in ARG with `linebuf',
+ and add the resulting string to the list of arguments for the command
+ to execute.
+ ARGLEN is the length of ARG, not including the null.
+ LBLEN is the length of `linebuf', not including the null.
+
+ COMPAT: insertions on the SYSV version are limited to 255 chars per line,
+ and a max of 5 occurences of replace_pat in the initial-arguments.
+ Those restrictions do not exist here. */
+
+static void
+do_insert (arg, arglen, lblen)
+ char *arg;
+ size_t arglen;
+ size_t lblen;
+{
+ /* Temporary copy of each arg with the replace pattern replaced by the
+ real arg. */
+ static char *insertbuf;
+ char *p;
+ int bytes_left = arg_max - 1; /* Bytes left on the command line. */
+
+ if (!insertbuf)
+ insertbuf = (char *) xmalloc (arg_max + 1);
+ p = insertbuf;
+
+ do
+ {
+ size_t len; /* Length in ARG before `replace_pat'. */
+ char *s = strstr (arg, replace_pat);
+ if (s)
+ len = s - arg;
+ else
+ len = arglen;
+ bytes_left -= len;
+ if (bytes_left <= 0)
+ break;
+
+ strncpy (p, arg, len);
+ p += len;
+ arg += len;
+ arglen -= len;
+
+ if (s)
+ {
+ bytes_left -= lblen;
+ if (bytes_left <= 0)
+ break;
+ strcpy (p, linebuf);
+ arg += rplen;
+ arglen -= rplen;
+ p += lblen;
+ }
+ }
+ while (*arg);
+ if (*arg)
+ fatalError ("command too long");
+ *p++ = '\0';
+ push_arg (insertbuf, p - insertbuf);
+}
+
+/* Add ARG to the end of the list of arguments `cmd_argv' to pass
+ to the command.
+ LEN is the length of ARG, including the terminating null.
+ If this brings the list up to its maximum size, execute the command. */
+
+static void
+push_arg (arg, len)
+ char *arg;
+ size_t len;
+{
+ if (arg)
+ {
+ if (cmd_argv_chars + len > arg_max)
+ {
+ if (initial_args || cmd_argc == initial_argc)
+ fatalError ("can not fit single argument within argument list size limit");
+ if (replace_pat
+ || (exit_if_size_exceeded &&
+ (lines_per_exec || args_per_exec)))
+ fatalError ("argument list too long");
+ do_exec ();
+ }
+ if (!initial_args && args_per_exec &&
+ cmd_argc - initial_argc == args_per_exec)
+ do_exec ();
+ }
+
+ if (cmd_argc >= cmd_argv_alloc)
+ {
+ if (!cmd_argv)
+ {
+ cmd_argv_alloc = 64;
+ cmd_argv = (char **) xmalloc (sizeof (char *) * cmd_argv_alloc);
+ }
+ else
+ {
+ cmd_argv_alloc *= 2;
+ cmd_argv = (char **) xrealloc (cmd_argv,
+ sizeof (char *) * cmd_argv_alloc);
+ }
+ }
+
+ if (!arg)
+ cmd_argv[cmd_argc++] = NULL;
+ else
+ {
+ cmd_argv[cmd_argc++] = argbuf + cmd_argv_chars;
+ strcpy (argbuf + cmd_argv_chars, arg);
+ cmd_argv_chars += len;
+ }
+}
+
+/* Print the arguments of the command to execute.
+ If ASK is nonzero, prompt the user for a response, and
+ if the user responds affirmatively, return true;
+ otherwise, return false. */
+
+static boolean
+print_args (ask)
+ boolean ask;
+{
+ int i;
+
+ for (i = 0; i < cmd_argc - 1; i++)
+ fprintf (stderr, "%s ", cmd_argv[i]);
+ if (ask)
+ {
+ static FILE *tty_stream;
+ int c, savec;
+
+ if (!tty_stream)
+ {
+ tty_stream = fopen ("/dev/tty", "r");
+ if (!tty_stream)
+ fatalError (" Could not open /dev/tty");
+ }
+ fputs ("?...", stderr);
+ fflush (stderr);
+ c = savec = getc (tty_stream);
+ while (c != EOF && c != '\n')
+ c = getc (tty_stream);
+ if (savec == 'y' || savec == 'Y')
+ return true;
+ }
+ else
+ putc ('\n', stderr);
+
+ return false;
+}
+
+/* Execute the command that has been built in `cmd_argv'. This may involve
+ waiting for processes that were previously executed. */
+
+static void
+do_exec ()
+{
+ pid_t child;
+
+ push_arg ((char *) NULL, 0); /* Null terminate the arg list. */
+ if (!query_before_executing || print_args (true))
+ {
+ if (proc_max && procs_executing >= proc_max)
+ wait_for_proc (false);
+ if (!query_before_executing && print_command)
+ print_args (false);
+ /* If we run out of processes, wait for a child to return and
+ try again. */
+ while ((child = fork ()) < 0 && errno == EAGAIN && procs_executing)
+ wait_for_proc (false);
+ switch (child)
+ {
+ case -1:
+ fatalError ("cannot fork");
+
+ case 0: /* Child. */
+ execvp (cmd_argv[0], cmd_argv);
+ errorMsg ("failed to exec '%s'", cmd_argv[0]);
+ _exit (errno == ENOENT ? 127 : 126);
+ }
+ add_proc (child);
+ }
+
+ cmd_argc = initial_argc;
+ cmd_argv_chars = initial_argv_chars;
+}
+
+/* Add the process with id PID to the list of processes that have
+ been executed. */
+
+static void
+add_proc (pid)
+ pid_t pid;
+{
+ int i;
+
+ /* Find an empty slot. */
+ for (i = 0; i < pids_alloc && pids[i]; i++)
+ ;
+ if (i == pids_alloc)
+ {
+ if (pids_alloc == 0)
+ {
+ pids_alloc = proc_max ? proc_max : 64;
+ pids = (pid_t *) xmalloc (sizeof (pid_t) * pids_alloc);
+ }
+ else
+ {
+ pids_alloc *= 2;
+ pids = (pid_t *) xrealloc (pids,
+ sizeof (pid_t) * pids_alloc);
+ }
+ memset (&pids[i], '\0', sizeof (pid_t) * (pids_alloc - i));
+ }
+ pids[i] = pid;
+ procs_executing++;
+ procs_executed++;
+}
+
+/* If ALL is true, wait for all child processes to finish;
+ otherwise, wait for one child process to finish.
+ Remove the processes that finish from the list of executing processes. */
+
+static void
+wait_for_proc (all)
+ boolean all;
+{
+ while (procs_executing)
+ {
+ int i, status;
+
+ do
+ {
+ pid_t pid;
+
+ pid = wait (&status);
+ if (pid < 0)
+ fatalError ("error waiting for child process");
+
+ /* Find the entry in `pids' for the child process
+ that exited. */
+ for (i = 0; i < pids_alloc && pid != pids[i]; i++)
+ ;
+ }
+ while (i == pids_alloc); /* A child died that we didn't start? */
+
+ /* Remove the child from the list. */
+ pids[i] = 0;
+ procs_executing--;
+
+ if (WEXITSTATUS (status) == 126 || WEXITSTATUS (status) == 127)
+ exit (WEXITSTATUS (status)); /* Can't find or run the command. */
+ if (WEXITSTATUS (status) == 255)
+ fatalError ( "%s: exited with status 255; aborting", cmd_argv[0]);
+ if (WIFSTOPPED (status))
+ fatalError ( "%s: stopped by signal %d", cmd_argv[0], WSTOPSIG (status));
+ if (WIFSIGNALED (status))
+ fatalError ("%s: terminated by signal %d", cmd_argv[0], WTERMSIG (status));
+ if (WEXITSTATUS (status) != 0)
+ child_error = 123;
+
+ if (!all)
+ break;
+ }
+}
+
+/* Return the value of the number represented in STR.
+ OPTION is the command line option to which STR is the argument.
+ If the value does not fall within the boundaries MIN and MAX,
+ Print an error message mentioning OPTION and exit. */
+
+static long
+parse_num (str, option, min, max)
+ char *str;
+ int option;
+ long min;
+ long max;
+{
+ char *eptr;
+ long val;
+
+ val = strtol (str, &eptr, 10);
+ if (eptr == str || *eptr)
+ {
+ fprintf (stderr, "%s: invalid number for -%c option\n",
+ program_name, option);
+ usage (xargs_usage);
+ }
+ else if (val < min)
+ {
+ fprintf (stderr, "%s: value for -%c option must be >= %ld\n",
+ program_name, option, min);
+ usage (xargs_usage);
+ }
+ else if (max >= 0 && val > max)
+ {
+ fprintf (stderr, "%s: value for -%c option must be < %ld\n",
+ program_name, option, max);
+ usage (xargs_usage);
+ }
+ return val;
+}
+
+/* Return how much of ARG_MAX is used by the environment. */
+
+static long
+env_size (envp)
+ char **envp;
+{
+ long len = 0;
+
+ while (*envp)
+ len += strlen (*envp++) + 1;
+
+ return len;
+}
+