1 /* 2 * Copyright (c) 1987 Regents of the University of California. 3 * 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *rcsid = "$OpenBSD: getenv.c,v 1.3 1996/08/19 08:33:31 tholo Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <stdlib.h> 39 #include <string.h> 40 41 /* 42 * __findenv -- 43 * Returns pointer to value associated with name, if any, else NULL. 44 * Sets offset to be the offset of the name/value combination in the 45 * environmental array, for use by setenv(3) and unsetenv(3). 46 * Explicitly removes '=' in argument name. 47 * 48 * This routine *should* be a static; don't use it. 49 */ 50 char * 51 __findenv(name, offset) 52 register const char *name; 53 int *offset; 54 { 55 extern char **environ; 56 register int len; 57 register char **P, *C; 58 register const char *cp; 59 60 for (cp = name, len = 0; *cp != '\0' && *cp != '='; ++cp, ++len); 61 for (P = environ; *P; ++P) 62 if (!strncmp(*P, name, len)) 63 if (*(C = *P + len) == '=') { 64 *offset = P - environ; 65 return(++C); 66 } 67 return(NULL); 68 } 69 70 /* 71 * getenv -- 72 * Returns ptr to value associated with name, if any, else NULL. 73 */ 74 char * 75 getenv(name) 76 const char *name; 77 { 78 int offset; 79 char *__findenv(); 80 81 return(__findenv(name, &offset)); 82 } 83