1 /* Copyright (C) 1991-2019 Free Software Foundation, Inc.
2 This file based on putenv.c in 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., 51 Franklin Street - Fifth Floor,
17 Boston, MA 02110-1301, USA. */
21 @deftypefn Supplemental int putenv (const char *@var{string})
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.
32 #if defined (_AIX) && !defined (__GNUC__)
42 #define putenv libiberty_putenv
56 # define alloca __builtin_alloca
58 extern char *alloca ();
59 # endif /* __GNUC__ */
61 #endif /* HAVE_ALLOCA_H */
65 /* Below this point, it's verbatim code from the glibc-2.0 implementation */
68 /* Put STRING, which is of the form "NAME=VALUE", in the environment. */
70 putenv (const char *string
)
72 const char *const name_end
= strchr (string
, '=');
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);
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