b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/* $NetBSD: unsetenv.c,v 1.10 2010/11/14 18:11:43 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: unsetenv.c,v 1.10 2010/11/14 18:11:43 tron Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include "namespace.h"
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <bitstring.h>
|
|
|
|
#include "env.h"
|
|
#include "reentrant.h"
|
|
#include "local.h"
|
|
|
|
/*
|
|
* unsetenv(name) --
|
|
* Delete environmental variable "name".
|
|
*/
|
|
int
|
|
unsetenv(const char *name)
|
|
{
|
|
size_t l_name;
|
|
ssize_t r_offset, w_offset;
|
|
|
|
_DIAGASSERT(name != NULL);
|
|
|
|
l_name = __envvarnamelen(name, false);
|
|
if (l_name == 0) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
if (!__writelockenv())
|
|
return -1;
|
|
|
|
/* Search for the given name in the environment. */
|
|
r_offset = __getenvslot(name, l_name, false);
|
|
if (r_offset == -1) {
|
|
/* Not found. */
|
|
(void)__unlockenv();
|
|
return 0;
|
|
}
|
|
__freeenvvar(environ[r_offset]);
|
|
|
|
/*
|
|
* Remove all matches from the environment and free the associated
|
|
* memory if possible.
|
|
*/
|
|
w_offset = r_offset;
|
|
while (environ[++r_offset] != NULL) {
|
|
if (strncmp(environ[r_offset], name, l_name) != 0 ||
|
|
environ[r_offset][l_name] != '=') {
|
|
/* Not a match, keep this entry. */
|
|
environ[w_offset++] = environ[r_offset];
|
|
} else {
|
|
/* We found another match. */
|
|
__freeenvvar(environ[r_offset]);
|
|
}
|
|
}
|
|
|
|
/* Clear out remaining stale entries in the environment vector. */
|
|
do {
|
|
environ[w_offset++] = NULL;
|
|
} while (w_offset < r_offset);
|
|
|
|
(void)__unlockenv();
|
|
return 0;
|
|
}
|