xref: /csrg-svn/lib/libc/stdlib/putenv.c (revision 36771)
1 /*
2  * Copyright (c) 1988 The Regents of the University of California.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms are permitted
6  * provided that the above copyright notice and this paragraph are
7  * duplicated in all such forms and that any documentation,
8  * advertising materials, and other materials related to such
9  * distribution and use acknowledge that the software was developed
10  * by the University of California, Berkeley.  The name of the
11  * University may not be used to endorse or promote products derived
12  * from this software without specific prior written permission.
13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16  */
17 
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static char sccsid[] = "@(#)putenv.c	5.1 (Berkeley) 02/14/89";
20 #endif /* LIBC_SCCS and not lint */
21 
22 putenv(str)
23 	char *str;
24 {
25 	register char *equal;
26 	int rval;
27 	char *index();
28 
29 	if (!(equal = index(str, '=')))
30 		return(1);
31 	*equal = '\0';
32 	rval = setenv(str, equal + 1, 1);
33 	*equal = '=';
34 	return(rval);
35 }
36