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
23Uses @code{setenv} or @code{unsetenv} to put @var{string} into
24the 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
26name 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
58extern 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.  */
69int
70putenv (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