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[glibc.git] / sysdeps / generic / putenv.c
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1 /* Copyright (C) 1991, 94, 95, 96, 97, 98 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 #if defined _AIX && !defined __GNUC__
20 #pragma alloca
21 #endif
23 #if HAVE_CONFIG_H
24 # include <config.h>
25 #endif
27 #if _LIBC || HAVE_STDLIB_H
28 # include <stdlib.h>
29 #endif
30 #if _LIBC || HAVE_STRING_H
31 # include <string.h>
32 #endif
34 #if !__GNU_LIBRARY__ && !HAVE_STRCHR
35 # define strchr index
36 #endif
38 #ifndef _LIBC
39 # ifdef HAVE_ALLOCA_H
40 # include <alloca.h>
41 # else
42 # ifdef __GNUC__
43 # define alloca __builtin_alloca
44 # else
45 extern char *alloca ();
46 # endif /* __GNUC__ */
47 # endif /* HAVE_ALLOCA_H */
48 #endif /* _LIBC */
51 /* Put STRING, which is of the form "NAME=VALUE", in the environment. */
52 int
53 putenv (string)
54 const char *string;
56 const char *const name_end = strchr (string, '=');
58 if (name_end != NULL)
60 #ifdef _LIBC
61 char *name = strndupa (string, name_end - string);
62 #else
63 char *name = alloca (name_end - string + 1);
64 memcpy (name, string, name_end - string);
65 name[name_end - string] = '\0';
66 #endif
67 return __setenv (name, name_end + 1, 1);
70 __unsetenv (string);
71 return 0;