diff options
Diffstat (limited to 'posix/execl.c')
| -rw-r--r-- | posix/execl.c | 53 |
1 files changed, 29 insertions, 24 deletions
diff --git a/posix/execl.c b/posix/execl.c index 7f822d0..62fd45d 100644 --- a/posix/execl.c +++ b/posix/execl.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1991,92,94,97,98,99,2002,2005 Free Software Foundation, Inc. +/* Copyright (C) 1991,92,94,97,98,99,2002 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -16,58 +16,63 @@ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ +#include <alloca.h> #include <unistd.h> #include <stdarg.h> #include <stddef.h> -#include <stdlib.h> #include <string.h> #include <stackinfo.h> +#ifndef HAVE_GNU_LD +# define __environ environ +#endif /* Execute PATH with all arguments after PATH until a NULL pointer and environment from `environ'. */ int execl (const char *path, const char *arg, ...) { -#define INITIAL_ARGV_MAX 1024 - size_t argv_max = INITIAL_ARGV_MAX; - const char *initial_argv[INITIAL_ARGV_MAX]; - const char **argv = initial_argv; + size_t argv_max = 1024; + const char **argv = alloca (argv_max * sizeof (const char *)); + unsigned int i; va_list args; argv[0] = arg; va_start (args, arg); - unsigned int i = 0; + i = 0; while (argv[i++] != NULL) { if (i == argv_max) { - argv_max *= 2; - const char **nptr = realloc (argv == initial_argv ? NULL : argv, - argv_max * sizeof (const char *)); - if (nptr == NULL) + const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *)); + +#ifndef _STACK_GROWS_UP + if ((char *) nptr + argv_max == (char *) argv) { - if (argv != initial_argv) - free (argv); - return -1; + /* Stack grows down. */ + argv = (const char **) memcpy (nptr, argv, + i * sizeof (const char *)); + argv_max += i; } - if (argv == initial_argv) - /* We have to copy the already filled-in data ourselves. */ - memcpy (nptr, argv, i * sizeof (const char *)); - - argv = nptr; + else +#endif +#ifndef _STACK_GROWS_DOWN + if ((char *) argv + i == (char *) nptr) + /* Stack grows up. */ + argv_max += i; + else +#endif + /* We have a hole in the stack. */ + argv = (const char **) memcpy (nptr, argv, + i * sizeof (const char *)); } argv[i] = va_arg (args, const char *); } va_end (args); - int ret = __execve (path, (char *const *) argv, __environ); - if (argv != initial_argv) - free (argv); - - return ret; + return __execve (path, (char *const *) argv, __environ); } libc_hidden_def (execl) |