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/*
* Copyright 1999-2006 University of Chicago
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
/* based on @(#)setenv.c 8.1 (Berkeley) 6/4/93 */
/* based on @(#)getenv.c 8.1 (Berkeley) 6/4/93 */
#include "globus_config.h"
#ifndef HAVE_UNSETENV
#ifndef __STDC__
#define const
#endif
#include <stddef.h>
#ifdef TARGET_ARCH_CRAYT3E
#include <malloc.h>
#else
#include <stdlib.h>
#endif
#include <string.h>
#ifndef __P
#define __P(x) ()
#endif
static char *__findenv __P((const char *, long *));
/*
* unsetenv(name) --
* Delete environmental variable "name".
*/
void
unsetenv(name)
const char *name;
{
extern char **environ;
register char **p;
long offset;
while (__findenv(name, &offset)) /* if set multiple times */
for (p = &environ[offset];; ++p)
if (!(*p = *(p + 1)))
break;
}
/*
* __findenv --
* Returns pointer to value associated with name, if any, else NULL.
* Sets offset to be the offset of the name/value combination in the
* environmental array, for use by setenv(3) and unsetenv(3).
* Explicitly removes '=' in argument name.
*/
static char *
__findenv(name, offset)
register const char *name;
long *offset;
{
extern char **environ;
register int len;
register const char *np;
register char **p, *c;
if (name == NULL || environ == NULL)
return (NULL);
for (np = name; *np && *np != '='; ++np)
continue;
len = np - name;
for (p = environ; (c = *p) != NULL; ++p)
if (strncmp(c, name, len) == 0 && c[len] == '=') {
*offset = (long)(p - environ);
return (c + len + 1);
}
return (NULL);
}
#endif
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