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 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * MKS interface extension. 31 * A version of getenv() that doesn't overwrite it's return value 32 * on each call. 33 * 34 * Copyright 1995 by Mortice Kern Systems Inc. All rights reserved. 35 * 36 */ 37 38 #ifdef M_RCSID 39 #ifndef lint 40 static char const rcsID[] = "$Header: /rd/src/libc/mks/rcs/m_getenv.c 1.2 1995/07/11 16:53:01 ross Exp $"; 41 #endif /*lint*/ 42 #endif /*M_RCSID*/ 43 44 #include <mks.h> 45 #include <stdlib.h> 46 #include <string.h> 47 48 #ifdef M_NON_STATIC_GETENV 49 50 #undef __m_getenv 51 52 /*f 53 * Assume getenv() works the way we expect it to on PC systems. 54 */ 55 char * 56 __m_getenv(char const *name) { 57 return getenv(name); 58 } 59 60 #else /* M_NON_STATIC_GETENV */ 61 62 extern char **environ; 63 64 /*f 65 * A version of getenv safe to use in library functions. According to 66 * ANSI C and XPG 4 no library function shall behave as if it called 67 * getenv. This is a problem on systems that have getenv functions 68 * that overwrite their return value on each call. 69 */ 70 71 char * 72 __m_getenv(char const *name) { 73 if (m_setenv() != NULL) { 74 int len = strlen(name); 75 char **envp = environ; 76 char *s = *envp++; 77 78 while(s != NULL) { 79 if (strncmp(name, s, len) == 0 && s[len] == '=') { 80 return s + len + 1; 81 } 82 s = *envp++; 83 } 84 } 85 return NULL; 86 } 87 88 #endif /* M_NON_STATIC_GETENV */ 89