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 * @(#)setenv.cc 1.6 06/12/12 27 */ 28 29 #pragma ident "@(#)setenv.cc 1.6 06/12/12" 30 31 #include <stdlib.h> 32 #include <string.h> 33 #include <unistd.h> 34 35 extern char **environ; 36 37 static short setenv_made_new_vector= 0; 38 39 char *setenv(char *name, char *value) 40 { char *p= NULL, **q; 41 int length= 0, vl; 42 43 if ((p= getenv(name)) == NULL) { /* Allocate new vector */ 44 for (q= environ; *q != NULL; q++, length++); 45 q= (char **)malloc((unsigned)(sizeof(char *)*(length+2))); 46 memcpy(((char *)q)+sizeof(char *), (char *)environ, sizeof(char *)*(length+1)); 47 if (setenv_made_new_vector++) 48 free((char *)environ); 49 length= strlen(name); 50 environ= q;} 51 else { /* Find old slot */ 52 length= strlen(name); 53 for (q= environ; *q != NULL; q++) 54 if (!strncmp(*q, name, length)) 55 break;}; 56 vl= strlen(value); 57 if (!p || (length+vl+1 > strlen(p))) 58 *q= p= (char *) malloc((unsigned)(length+vl+2)); 59 else 60 p= *q; 61 (void)strcpy(p, name); p+= length; 62 *p++= '='; 63 (void)strcpy(p, value); 64 return(value); 65 }