121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
|
/* Copyright (C) 1992, 1995-2002, 2005-2010 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
This program is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program 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 General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
|
||
|
|
optimizes away the name == NULL test below. */
|
||
|
|
#define _GL_ARG_NONNULL(params)
|
||
|
|
|
||
|
|
/* Specification. */
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#if !_LIBC
|
||
|
|
# define __set_errno(ev) ((errno) = (ev))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#if !_LIBC
|
||
|
|
# define __environ environ
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if _LIBC
|
||
|
|
/* This lock protects against simultaneous modifications of `environ'. */
|
||
|
|
# include <bits/libc-lock.h>
|
||
|
|
__libc_lock_define_initialized (static, envlock)
|
||
|
|
# define LOCK __libc_lock_lock (envlock)
|
||
|
|
# define UNLOCK __libc_lock_unlock (envlock)
|
||
|
|
#else
|
||
|
|
# define LOCK
|
||
|
|
# define UNLOCK
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* In the GNU C library we must keep the namespace clean. */
|
||
|
|
#ifdef _LIBC
|
||
|
|
# define unsetenv __unsetenv
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if _LIBC || !HAVE_UNSETENV
|
||
|
|
|
||
|
|
int
|
||
|
|
unsetenv (const char *name)
|
||
|
|
{
|
||
|
|
size_t len;
|
||
|
|
char **ep;
|
||
|
|
|
||
|
|
if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
|
||
|
|
{
|
||
|
|
__set_errno (EINVAL);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
len = strlen (name);
|
||
|
|
|
||
|
|
LOCK;
|
||
|
|
|
||
|
|
ep = __environ;
|
||
|
|
while (*ep != NULL)
|
||
|
|
if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
|
||
|
|
{
|
||
|
|
/* Found it. Remove this pointer by moving later ones back. */
|
||
|
|
char **dp = ep;
|
||
|
|
|
||
|
|
do
|
||
|
|
dp[0] = dp[1];
|
||
|
|
while (*dp++);
|
||
|
|
/* Continue the loop in case NAME appears again. */
|
||
|
|
}
|
||
|
|
else
|
||
|
|
++ep;
|
||
|
|
|
||
|
|
UNLOCK;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef _LIBC
|
||
|
|
# undef unsetenv
|
||
|
|
weak_alias (__unsetenv, unsetenv)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#else /* HAVE_UNSETENV */
|
||
|
|
|
||
|
|
# undef unsetenv
|
||
|
|
|
||
|
|
/* Call the underlying unsetenv, in case there is hidden bookkeeping
|
||
|
|
that needs updating beyond just modifying environ. */
|
||
|
|
int
|
||
|
|
rpl_unsetenv (const char *name)
|
||
|
|
{
|
||
|
|
int result = 0;
|
||
|
|
if (!name || !*name || strchr (name, '='))
|
||
|
|
{
|
||
|
|
errno = EINVAL;
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
while (getenv (name))
|
||
|
|
# if !VOID_UNSETENV
|
||
|
|
result =
|
||
|
|
# endif
|
||
|
|
unsetenv (name);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* HAVE_UNSETENV */
|