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/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#if defined _AIX && !defined __GNUC__
#pragma alloca
#endif
#if HAVE_CONFIG_H
# include <config.h>
#endif
#if _LIBC || HAVE_STDLIB_H
# include <stdlib.h>
#endif
#if _LIBC || HAVE_STRING_H
# include <string.h>
#endif
#if !__GNU_LIBRARY__ && !HAVE_STRCHR
# define strchr index
#endif
#ifndef _LIBC
# ifdef HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef __GNUC__
# define alloca __builtin_alloca
# else
extern char *alloca ();
# endif /* __GNUC__ */
# endif /* HAVE_ALLOCA_H */
#endif /* _LIBC */
/* Put STRING, which is of the form "NAME=VALUE", in the environment. */
int
putenv (char *string)
{
const char *const name_end = strchr (string, '=');
if (name_end != NULL)
{
char *name;
#ifdef _LIBC
int use_malloc = !__libc_use_alloca (name_end - string + 1);
if (__builtin_expect (use_malloc, 0))
{
name = __strndup (string, name_end - string);
if (name == NULL)
return -1;
}
else
name = strndupa (string, name_end - string);
#else
# define use_malloc 1
name = malloc (name_end - string + 1);
if (name == NULL)
return -1;
memcpy (name, string, name_end - string);
name[name_end - string] = '\0';
#endif
int result = __add_to_environ (name, NULL, string, 1);
if (__glibc_unlikely (use_malloc))
free (name);
return result;
}
__unsetenv (string);
return 0;
}
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