1/* $OpenBSD: printenv.c,v 1.8 2015/10/09 01:37:08 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#include <stdio.h> 33#include <string.h> 34#include <stdlib.h> 35#include <unistd.h> 36#include <err.h> 37 38/* 39 * printenv 40 * 41 * Bill Joy, UCB 42 * February, 1979 43 */ 44int 45main(int argc, char *argv[]) 46{ 47 extern char **environ; 48 char *cp, **ep; 49 int len; 50 51 if (pledge("stdio", NULL) == -1) 52 err(1, "pledge"); 53 54 if (argc < 2) { 55 for (ep = environ; *ep; ep++) 56 puts(*ep); 57 exit(0); 58 } 59 len = strlen(*++argv); 60 for (ep = environ; *ep; ep++) 61 if (!strncmp(*ep, *argv, len)) { 62 cp = *ep + len; 63 if (!*cp || *cp == '=') { 64 puts(*cp ? cp + 1 : cp); 65 exit(0); 66 } 67 } 68 exit(1); 69} 70