]>
Commit | Line | Data |
---|---|---|
c84142e8 UD |
1 | /* Copyright (C) 1991, 1992, 1994, 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
28f540f4 | 3 | |
c84142e8 UD |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | License, or (at your option) any later version. | |
28f540f4 | 8 | |
c84142e8 UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Library General Public License for more details. | |
28f540f4 | 13 | |
c84142e8 UD |
14 | You should have received a copy of the GNU Library General Public |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
28f540f4 | 18 | |
76b87c03 | 19 | #include <alloca.h> |
28f540f4 RM |
20 | #include <unistd.h> |
21 | #include <stdarg.h> | |
22 | #include <stddef.h> | |
c84142e8 | 23 | #include <string.h> |
28f540f4 RM |
24 | |
25 | #ifndef HAVE_GNU_LD | |
c84142e8 | 26 | # define __environ environ |
28f540f4 RM |
27 | #endif |
28 | ||
29 | /* Execute PATH with all arguments after PATH until | |
30 | a NULL pointer and environment from `environ'. */ | |
31 | int | |
c84142e8 | 32 | execl (const char *path, const char *arg, ...) |
28f540f4 | 33 | { |
c84142e8 UD |
34 | size_t argv_max = 1024; |
35 | const char **argv = alloca (argv_max * sizeof (const char *)); | |
36 | unsigned int i; | |
28f540f4 RM |
37 | va_list args; |
38 | ||
39 | argv[0] = arg; | |
40 | ||
41 | va_start (args, arg); | |
42 | i = 1; | |
43 | do | |
44 | { | |
c84142e8 UD |
45 | if (i == argv_max) |
46 | { | |
47 | const char **nptr = alloca ((argv_max *= 2) * sizeof (const char *)); | |
48 | ||
49 | if ((char *) nptr + argv_max == (char *) argv) | |
50 | { | |
51 | /* Stack grows down. */ | |
52 | argv = (const char **) memcpy (nptr, argv, i); | |
53 | argv_max += i; | |
54 | } | |
55 | else if ((char *) argv + i == (char *) nptr) | |
56 | /* Stack grows up. */ | |
57 | argv_max += i; | |
58 | else | |
59 | /* We have a hole in the stack. */ | |
60 | argv = (const char **) memcpy (nptr, argv, i); | |
61 | } | |
62 | ||
63 | argv[i] = va_arg (args, const char *); | |
64 | } | |
65 | while (argv[i++] != NULL); | |
28f540f4 RM |
66 | va_end (args); |
67 | ||
c84142e8 | 68 | return __execve (path, (char *const *) argv, __environ); |
28f540f4 | 69 | } |