minix/lib/nbsd_libc/compat/stdlib/compat_unsetenv.c

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/* $NetBSD: compat_unsetenv.c,v 1.3 2010/11/14 18:11:42 tron Exp $ */
/*
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "from: @(#)setenv.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: compat_unsetenv.c,v 1.3 2010/11/14 18:11:42 tron Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#define __LIBC12_SOURCE__
#include "namespace.h"
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <compat/include/stdlib.h>
#include <string.h>
#include <bitstring.h>
#include "reentrant.h"
#include "local.h"
#ifdef __weak_alias
__weak_alias(unsetenv,_unsetenv)
#endif
#include "env.h"
__warn_references(unsetenv,
"warning: reference to compatibility unsetenv();"
" include <stdlib.h> for correct reference")
/*
* unsetenv(name) --
* Delete environmental variable "name".
*/
void
unsetenv(const char *name)
{
size_t l_name;
_DIAGASSERT(name != NULL);
l_name = strlen(name);
if (__writelockenv()) {
ssize_t offset;
while ((offset = __getenvslot(name, l_name, false)) != -1) {
char **p;
for (p = &environ[offset]; ; ++p) {
if ((*p = *(p + 1)) == NULL)
break;
}
}
(void)__unlockenv();
}
}