1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 1994 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30
31 extern char **environ;
32
33 static short setenv_made_new_vector= 0;
34
setenv(char * name,char * value)35 char *setenv(char *name, char *value)
36 { char *p= NULL, **q;
37 int length= 0, vl;
38
39 if ((p= getenv(name)) == NULL) { /* Allocate new vector */
40 for (q= environ; *q != NULL; q++, length++);
41 q= (char **)malloc((unsigned)(sizeof(char *)*(length+2)));
42 memcpy(((char *)q)+sizeof(char *), (char *)environ, sizeof(char *)*(length+1));
43 if (setenv_made_new_vector++)
44 free((char *)environ);
45 length= strlen(name);
46 environ= q;}
47 else { /* Find old slot */
48 length= strlen(name);
49 for (q= environ; *q != NULL; q++)
50 if (!strncmp(*q, name, length))
51 break;};
52 vl= strlen(value);
53 if (!p || (length+vl+1 > strlen(p)))
54 *q= p= (char *) malloc((unsigned)(length+vl+2));
55 else
56 p= *q;
57 (void)strcpy(p, name); p+= length;
58 *p++= '=';
59 (void)strcpy(p, value);
60 return(value);
61 }
62