1/* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if defined(LIBC_SCCS) && !defined(lint) 31static char sccsid[] = "@(#)getenv.c 8.1 (Berkeley) 6/4/93"; 32#endif /* LIBC_SCCS and not lint */ 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: src/lib/libc/stdlib/getenv.c,v 1.8 2007/05/01 16:02:41 ache Exp $"); 35 36#include <stdlib.h> 37#include <stddef.h> 38#include <string.h> 39#include <crt_externs.h> 40 41__private_extern__ char *__findenv(const char *, int *, char **); 42 43/* 44 * __findenv -- 45 * Returns pointer to value associated with name, if any, else NULL. 46 * Sets offset to be the offset of the name/value combination in the 47 * environmental array, for use by setenv(3) and unsetenv(3). 48 * Explicitly removes '=' in argument name. 49 * 50 * This routine *should* be a static; don't use it. 51 */ 52__private_extern__ char * 53__findenv(name, offset, environ) 54 const char *name; 55 int *offset; 56 char **environ; 57{ 58 int len, i; 59 const char *np; 60 char **p, *cp; 61 62 if (name == NULL || environ == NULL) 63 return (NULL); 64 for (np = name; *np && *np != '='; ++np) 65 continue; 66 len = np - name; 67 for (p = environ; (cp = *p) != NULL; ++p) { 68 for (np = name, i = len; i && *cp; i--) 69 if (*cp++ != *np++) 70 break; 71 if (i == 0 && *cp++ == '=') { 72 *offset = p - environ; 73 return (cp); 74 } 75 } 76 return (NULL); 77} 78 79/* 80 * _getenvp -- SPI using an arbitrary pointer to string array (the array must 81 * have been created with malloc) and an env state, created by _allocenvstate(). 82 * Returns ptr to value associated with name, if any, else NULL. 83 */ 84char * 85_getenvp(const char *name, char ***envp, void *state __unused) 86{ 87 int offset; 88 89 return (__findenv(name, &offset, *envp)); 90} 91 92/* 93 * getenv -- 94 * Returns ptr to value associated with name, if any, else NULL. 95 */ 96char * 97getenv(name) 98 const char *name; 99{ 100 int offset; 101 102 return (__findenv(name, &offset, *_NSGetEnviron())); 103} 104