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 /* 23 * Copyright (c) 1996, by Sun Microsystems, Inc. 24 * All rights reserved. 25 */ 26 27 /* 28 * MKS interface extension. 29 * A version of getenv() that doesn't overwrite it's return value 30 * on each call. 31 * 32 * Copyright 1995 by Mortice Kern Systems Inc. All rights reserved. 33 * 34 */ 35 36 #ifdef M_RCSID 37 #ifndef lint 38 static char const rcsID[] = "$Header: /rd/src/libc/mks/rcs/m_getenv.c 1.2 1995/07/11 16:53:01 ross Exp $"; 39 #endif /*lint*/ 40 #endif /*M_RCSID*/ 41 42 #include <mks.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #ifdef M_NON_STATIC_GETENV 47 48 #undef __m_getenv 49 50 /*f 51 * Assume getenv() works the way we expect it to on PC systems. 52 */ 53 char * 54 __m_getenv(char const *name) { 55 return getenv(name); 56 } 57 58 #else /* M_NON_STATIC_GETENV */ 59 60 extern char **environ; 61 62 /*f 63 * A version of getenv safe to use in library functions. According to 64 * ANSI C and XPG 4 no library function shall behave as if it called 65 * getenv. This is a problem on systems that have getenv functions 66 * that overwrite their return value on each call. 67 */ 68 69 char * 70 __m_getenv(char const *name) { 71 if (m_setenv() != NULL) { 72 int len = strlen(name); 73 char **envp = environ; 74 char *s = *envp++; 75 76 while(s != NULL) { 77 if (strncmp(name, s, len) == 0 && s[len] == '=') { 78 return s + len + 1; 79 } 80 s = *envp++; 81 } 82 } 83 return NULL; 84 } 85 86 #endif /* M_NON_STATIC_GETENV */ 87