1 /* Copyright (C) 1991, 1994, 1995, 1996, 2002 Free Software Foundation, Inc.
2 This file based on putenv.c in the GNU C Library.
3
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.
8
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.
13
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., 51 Franklin Street - Fifth Floor,
17 Boston, MA 02110-1301, USA. */
18
19 /*
20
21 @deftypefn Supplemental int putenv (const char *@var{string})
22
23 Uses @code{setenv} or @code{unsetenv} to put @var{string} into
24 the environment or remove it. If @var{string} is of the form
25 @samp{name=value} the string is added; if no @samp{=} is present the
26 name is unset/removed.
27
28 @end deftypefn
29
30 */
31
32 #if defined (_AIX) && !defined (__GNUC__)
33 #pragma alloca
34 #endif
35
36 #if HAVE_CONFIG_H
37 # include <config.h>
38 #endif
39
40 #include "ansidecl.h"
41
42 #define putenv libiberty_putenv
43
44 #if HAVE_STDLIB_H
45 # include <stdlib.h>
46 #endif
47 #if HAVE_STRING_H
48 # include <string.h>
49 #endif
50
51 #ifdef HAVE_ALLOCA_H
52 # include <alloca.h>
53 #else
54 # ifndef alloca
55 # ifdef __GNUC__
56 # define alloca __builtin_alloca
57 # else
58 extern char *alloca ();
59 # endif /* __GNUC__ */
60 # endif /* alloca */
61 #endif /* HAVE_ALLOCA_H */
62
63 #undef putenv
64
65 /* Below this point, it's verbatim code from the glibc-2.0 implementation */
66
67
68 /* Put STRING, which is of the form "NAME=VALUE", in the environment. */
69 int
putenv(const char * string)70 putenv (const char *string)
71 {
72 const char *const name_end = strchr (string, '=');
73
74 if (name_end)
75 {
76 char *name = (char *) alloca (name_end - string + 1);
77 memcpy (name, string, name_end - string);
78 name[name_end - string] = '\0';
79 return setenv (name, name_end + 1, 1);
80 }
81
82 unsetenv (string);
83 return 0;
84 }
85