1 /* $OpenBSD: printenv.c,v 1.5 2003/06/10 22:20:49 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1987 Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 char copyright[] = 34 "@(#) Copyright (c) 1987 Regents of the University of California.\n\ 35 All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #ifndef lint 39 /*static char sccsid[] = "from: @(#)printenv.c 5.4 (Berkeley) 6/1/90";*/ 40 static char rcsid[] = "$OpenBSD: printenv.c,v 1.5 2003/06/10 22:20:49 deraadt Exp $"; 41 #endif /* not lint */ 42 43 #include <stdio.h> 44 #include <string.h> 45 #include <stdlib.h> 46 47 /* 48 * printenv 49 * 50 * Bill Joy, UCB 51 * February, 1979 52 */ 53 int 54 main(int argc, char *argv[]) 55 { 56 extern char **environ; 57 char *cp, **ep; 58 int len; 59 60 if (argc < 2) { 61 for (ep = environ; *ep; ep++) 62 puts(*ep); 63 exit(0); 64 } 65 len = strlen(*++argv); 66 for (ep = environ; *ep; ep++) 67 if (!strncmp(*ep, *argv, len)) { 68 cp = *ep + len; 69 if (!*cp || *cp == '=') { 70 puts(*cp ? cp + 1 : cp); 71 exit(0); 72 } 73 } 74 exit(1); 75 } 76