/* $NetBSD: compat_unsetenv.c,v 1.1 2005/09/13 01:44:09 christos 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 1.1 2005/09/13 01:44:09 christos 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 "local.h" #include "reentrant.h" #ifdef __weak_alias __weak_alias(unsetenv,_unsetenv) #endif #ifdef _REENTRANT extern rwlock_t __environ_lock; #endif __warn_references(unsetenv, "warning: reference to compatibility unsetenv();" " include <stdlib.h> for correct reference") extern char **environ; /* * unsetenv(name) -- * Delete environmental variable "name". */ void unsetenv(const char *name) { char **p; int offset; _DIAGASSERT(name != NULL); rwlock_wrlock(&__environ_lock); while (__findenv(name, &offset)) /* if set multiple times */ for (p = &environ[offset];; ++p) if (!(*p = *(p + 1))) break; rwlock_unlock(&__environ_lock); }