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-rw-r--r--posix/execl.c53
1 files changed, 24 insertions, 29 deletions
diff --git a/posix/execl.c b/posix/execl.c
index 62fd45db58..7f822d0142 100644
--- a/posix/execl.c
+++ b/posix/execl.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,92,94,97,98,99,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1991,92,94,97,98,99,2002,2005 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
@@ -16,63 +16,58 @@
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, ...)
{
- size_t argv_max = 1024;
- const char **argv = alloca (argv_max * sizeof (const char *));
- unsigned int i;
+#define INITIAL_ARGV_MAX 1024
+ size_t argv_max = INITIAL_ARGV_MAX;
+ const char *initial_argv[INITIAL_ARGV_MAX];
+ const char **argv = initial_argv;
va_list args;
argv[0] = arg;
va_start (args, arg);
- i = 0;
+ unsigned int i = 0;
while (argv[i++] != NULL)
{
if (i == argv_max)
{
- const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *));
-
-#ifndef _STACK_GROWS_UP
- if ((char *) nptr + argv_max == (char *) argv)
+ argv_max *= 2;
+ const char **nptr = realloc (argv == initial_argv ? NULL : argv,
+ argv_max * sizeof (const char *));
+ if (nptr == NULL)
{
- /* Stack grows down. */
- argv = (const char **) memcpy (nptr, argv,
- i * sizeof (const char *));
- argv_max += i;
+ if (argv != initial_argv)
+ free (argv);
+ return -1;
}
- 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 *));
+ if (argv == initial_argv)
+ /* We have to copy the already filled-in data ourselves. */
+ memcpy (nptr, argv, i * sizeof (const char *));
+
+ argv = nptr;
}
argv[i] = va_arg (args, const char *);
}
va_end (args);
- return __execve (path, (char *const *) argv, __environ);
+ int ret = __execve (path, (char *const *) argv, __environ);
+ if (argv != initial_argv)
+ free (argv);
+
+ return ret;
}
libc_hidden_def (execl)