1 /*
2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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 #include <config.h>
35
36 #include <stdlib.h>
37
38 #if !HAVE_DECL_ENVIRON
39 extern char **environ;
40 #endif
41
42 /*
43 * putenv --
44 * String points to a string of the form name=value.
45 *
46 * Makes the value of the environment variable name equal to
47 * value by altering an existing variable or creating a new one.
48 */
49
50 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
putenv(const char * string)51 putenv(const char *string)
52 {
53 int i;
54 const char *eq = (const char *)strchr(string, '=');
55 int len;
56
57 if (eq == NULL)
58 return 1;
59 len = eq - string;
60
61 if(environ == NULL) {
62 environ = malloc(sizeof(char*));
63 if(environ == NULL)
64 return 1;
65 environ[0] = NULL;
66 }
67
68 for(i = 0; environ[i] != NULL; i++)
69 if(strncmp(string, environ[i], len) == 0) {
70 environ[i] = string;
71 return 0;
72 }
73 environ = realloc(environ, sizeof(char*) * (i + 2));
74 if(environ == NULL)
75 return 1;
76 environ[i] = string;
77 environ[i+1] = NULL;
78 return 0;
79 }
80