mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 17:53:37 +08:00
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/* Copyright (C) 1991-2014 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
|
|
<http://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 (string)
|
|
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 (__builtin_expect (use_malloc, 0))
|
|
free (name);
|
|
|
|
return result;
|
|
}
|
|
|
|
__unsetenv (string);
|
|
return 0;
|
|
}
|