101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
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/* $NetBSD: __unsetenv13.c,v 1.1 2003/04/07 13:41:14 kleink Exp $ */
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/*
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* Copyright (c) 1987, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "from: @(#)setenv.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: __unsetenv13.c,v 1.1 2003/04/07 13:41:14 kleink Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include "local.h"
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#include "reentrant.h"
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#ifdef __weak_alias
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#ifdef __LIBC12_SOURCE__
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__weak_alias(unsetenv,_unsetenv)
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#endif
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#endif
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#ifdef _REENTRANT
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extern rwlock_t __environ_lock;
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#endif
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extern char **environ;
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/*
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* unsetenv(name) --
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* Delete environmental variable "name".
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*/
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#ifdef __LIBC12_SOURCE__
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void
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#else
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int
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#endif
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unsetenv(name)
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const char *name;
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{
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char **p;
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int offset;
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_DIAGASSERT(name != NULL);
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#ifndef __LIBC12_SOURCE__
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if (name == NULL || *name == '\0' || strchr(name, '=') != NULL) {
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errno = EINVAL;
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return (-1);
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}
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#endif
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rwlock_wrlock(&__environ_lock);
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while (__findenv(name, &offset)) /* if set multiple times */
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for (p = &environ[offset];; ++p)
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if (!(*p = *(p + 1)))
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break;
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rwlock_unlock(&__environ_lock);
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#ifndef __LIBC12_SOURCE__
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return (0);
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#endif
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}
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