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/* $NetBSD: setenv.c,v 1.10 2004/08/23 03:32:12 jlam 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 <nbcompat.h>
#include <nbcompat/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)setenv.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: setenv.c,v 1.10 2004/08/23 03:32:12 jlam Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#if 0
#include "namespace.h"
#endif
#include <nbcompat/assert.h>
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#include <nbcompat/stdlib.h>
#include <nbcompat/string.h>
#if 0
#include "local.h"
#include "reentrant.h"
#endif
char *__findenv __P((const char *, int *));
#if 0
#ifdef __weak_alias
__weak_alias(setenv,_setenv)
#endif
#endif
#if 0
#ifdef _REENTRANT
extern rwlock_t __environ_lock;
#endif
#endif
extern char **environ;
#ifndef rwlock_wrlock
#define rwlock_wrlock(lock) ((void)0)
#endif
#ifndef rwlock_unlock
#define rwlock_unlock(lock) ((void)0)
#endif
/*
* setenv --
* Set the value of the environmental variable "name" to be
* "value". If rewrite is set, replace any current value.
*/
int
setenv(name, value, rewrite)
const char *name;
const char *value;
int rewrite;
{
static int alloced; /* if allocated space before */
char *c;
const char *cc;
size_t l_value;
int offset;
_DIAGASSERT(name != NULL);
_DIAGASSERT(value != NULL);
if (*value == '=') /* no `=' in value */
++value;
l_value = strlen(value);
rwlock_wrlock(&__environ_lock);
/* find if already exists */
if ((c = __findenv(name, &offset)) != NULL) {
if (!rewrite) {
rwlock_unlock(&__environ_lock);
return (0);
}
if (strlen(c) >= l_value) { /* old larger; copy over */
while ((*c++ = *value++) != '\0');
rwlock_unlock(&__environ_lock);
return (0);
}
} else { /* create new slot */
int cnt;
char **p;
for (p = environ, cnt = 0; *p; ++p, ++cnt);
if (alloced) { /* just increase size */
environ = realloc(environ,
(size_t)(sizeof(char *) * (cnt + 2)));
if (!environ) {
rwlock_unlock(&__environ_lock);
return (-1);
}
}
else { /* get new space */
alloced = 1; /* copy old entries into it */
p = malloc((size_t)(sizeof(char *) * (cnt + 2)));
if (!p) {
rwlock_unlock(&__environ_lock);
return (-1);
}
memcpy(p, environ, cnt * sizeof(char *));
environ = p;
}
environ[cnt + 1] = NULL;
offset = cnt;
}
for (cc = name; *cc && *cc != '='; ++cc)/* no `=' in name */
continue;
if (!(environ[offset] = /* name + `=' + value */
malloc((size_t)((int)(cc - name) + l_value + 2)))) {
rwlock_unlock(&__environ_lock);
return (-1);
}
for (c = environ[offset]; (*c = *name++) && *c != '='; ++c);
for (*c++ = '='; (*c++ = *value++) != '\0'; );
rwlock_unlock(&__environ_lock);
return (0);
}
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