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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1984 AT&T */ 23 /* All Rights Reserved */ 24 25 #pragma ident "%Z%%M% %I% %E% SMI" /* from S5R2 1.2 */ 26 27 /*LINTLIBRARY*/ 28 /* 29 * getenv(name) 30 * returns ptr to value associated with name, if any, else NULL 31 */ 32 #define NULL 0 33 extern char **environ; 34 static char *nvmatch(); 35 36 char * 37 getenv(name) 38 register char *name; 39 { 40 register char *v, **p=environ; 41 42 if(p == NULL) 43 return(NULL); 44 while(*p != NULL) 45 if((v = nvmatch(name, *p++)) != NULL) 46 return(v); 47 return(NULL); 48 } 49 50 /* 51 * s1 is either name, or name=value 52 * s2 is name=value 53 * if names match, return value of s2, else NULL 54 * used for environment searching: see getenv 55 */ 56 57 static char * 58 nvmatch(s1, s2) 59 register char *s1, *s2; 60 { 61 while(*s1 == *s2++) 62 if(*s1++ == '=') 63 return(s2); 64 if(*s1 == '\0' && *(s2-1) == '=') 65 return(s2); 66 return(NULL); 67 } 68