129 lines
3.8 KiB
C
129 lines
3.8 KiB
C
/* $NetBSD: setenv.c,v 1.29 2005/02/17 21:22:25 christos 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. 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[] = "@(#)setenv.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: setenv.c,v 1.29 2005/02/17 21:22:25 christos 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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__weak_alias(setenv,_setenv)
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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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* setenv --
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* Set the value of the environmental variable "name" to be
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* "value". If rewrite is set, replace any current value.
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*/
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int
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setenv(name, value, rewrite)
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const char *name;
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const char *value;
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int rewrite;
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{
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static char **saveenv; /* copy of previously allocated space */
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char *c, **newenv;
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const char *cc;
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size_t l_value, size;
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int offset;
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_DIAGASSERT(name != NULL);
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_DIAGASSERT(value != NULL);
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if (*value == '=') /* no `=' in value */
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++value;
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l_value = strlen(value);
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rwlock_wrlock(&__environ_lock);
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/* find if already exists */
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if ((c = __findenv(name, &offset)) != NULL) {
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if (!rewrite)
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goto good;
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if (strlen(c) >= l_value) /* old larger; copy over */
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goto copy;
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} else { /* create new slot */
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size_t cnt;
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for (cnt = 0; environ[cnt]; ++cnt)
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continue;
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size = (size_t)(sizeof(char *) * (cnt + 2));
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if (saveenv == environ) { /* just increase size */
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if ((newenv = realloc(saveenv, size)) == NULL)
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goto bad;
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saveenv = newenv;
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} else { /* get new space */
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free(saveenv);
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if ((saveenv = malloc(size)) == NULL)
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goto bad;
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(void)memcpy(saveenv, environ, cnt * sizeof(char *));
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}
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environ = saveenv;
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environ[cnt + 1] = NULL;
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offset = (int)cnt;
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}
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for (cc = name; *cc && *cc != '='; ++cc) /* no `=' in name */
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continue;
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size = cc - name;
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/* name + `=' + value */
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if ((environ[offset] = malloc(size + l_value + 2)) == NULL)
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goto bad;
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c = environ[offset];
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(void)memcpy(c, name, size);
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c += size;
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*c++ = '=';
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copy:
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(void)memcpy(c, value, l_value + 1);
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good:
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rwlock_unlock(&__environ_lock);
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return 0;
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bad:
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rwlock_unlock(&__environ_lock);
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return -1;
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}
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