1 /* $NetBSD: putenv.c,v 1.21 2015/01/20 18:31:25 christos 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
35 static char sccsid[] = "@(#)putenv.c 8.2 (Berkeley) 3/27/94";
36 #else
37 __RCSID("$NetBSD: putenv.c,v 1.21 2015/01/20 18:31:25 christos 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
51 int
putenv(char * str)52 putenv(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