1/*
2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifdef HAVE_CONFIG_H
35#include <config.h>
36RCSID("$Id: putenv.c 14773 2005-04-12 11:29:18Z lha $");
37#endif
38
39#include <stdlib.h>
40
41extern char **environ;
42
43/*
44 * putenv --
45 *	String points to a string of the form name=value.
46 *
47 *      Makes the value of the environment variable name equal to
48 *      value by altering an existing variable or creating a new one.
49 */
50
51int ROKEN_LIB_FUNCTION
52putenv(const char *string)
53{
54    int i;
55    const char *eq = (const char *)strchr(string, '=');
56    int len;
57
58    if (eq == NULL)
59	return 1;
60    len = eq - string;
61
62    if(environ == NULL) {
63	environ = malloc(sizeof(char*));
64	if(environ == NULL)
65	    return 1;
66	environ[0] = NULL;
67    }
68
69    for(i = 0; environ[i] != NULL; i++)
70	if(strncmp(string, environ[i], len) == 0) {
71	    environ[i] = string;
72	    return 0;
73	}
74    environ = realloc(environ, sizeof(char*) * (i + 2));
75    if(environ == NULL)
76	return 1;
77    environ[i]   = string;
78    environ[i+1] = NULL;
79    return 0;
80}
81