1/*	$NetBSD: putenv.c,v 1.20 2013/04/25 07:08:56 matt Exp $	*/
2
3/*-
4 * Copyright (c) 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)putenv.c	8.2 (Berkeley) 3/27/94";
36#else
37__RCSID("$NetBSD: putenv.c,v 1.20 2013/04/25 07:08:56 matt Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42
43#include <assert.h>
44#include <errno.h>
45#include <stdlib.h>
46#include <string.h>
47
48#include "env.h"
49#include "local.h"
50
51int
52putenv(char *str)
53{
54	size_t l_name;
55	int rv;
56
57	_DIAGASSERT(str != NULL);
58
59	l_name = __envvarnamelen(str, true);
60	if (l_name == 0) {
61		errno = EINVAL;
62		return -1;
63	}
64
65	rv = -1;
66	if (__writelockenv()) {
67		ssize_t offset;
68
69		offset = __getenvslot(str, l_name, true);
70		if (offset != -1) {
71			if (environ[offset] != NULL)
72				__freeenvvar(environ[offset]);
73			environ[offset] = str;
74
75			rv = 0;
76		}
77
78		(void)__unlockenv();
79	}
80
81	return rv;
82}
83