1 /* $NetBSD: printenv.c,v 1.7 1999/09/10 04:05:28 simonb Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993 5 * The Regents of the University of California. 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1987, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 /*static char sccsid[] = "from: @(#)printenv.c 8.2 (Berkeley) 5/4/95";*/ 44 __RCSID("$NetBSD: printenv.c,v 1.7 1999/09/10 04:05:28 simonb Exp $"); 45 #endif /* not lint */ 46 47 #include <sys/types.h> 48 49 #include <stdlib.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 int main __P((int, char **)); 55 void usage __P((void)); 56 57 /* 58 * printenv 59 * 60 * Bill Joy, UCB 61 * February, 1979 62 */ 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 extern char **environ; 69 char *cp, **ep; 70 size_t len; 71 int ch; 72 73 while ((ch = getopt(argc, argv, "")) != -1) 74 switch(ch) { 75 case '?': 76 default: 77 usage(); 78 } 79 argc -= optind; 80 argv += optind; 81 82 if (argc == 0) { 83 for (ep = environ; *ep; ep++) 84 (void)printf("%s\n", *ep); 85 exit(0); 86 } 87 len = strlen(*argv); 88 for (ep = environ; *ep; ep++) 89 if (!memcmp(*ep, *argv, len)) { 90 cp = *ep + len; 91 if (!*cp || *cp == '=') { 92 (void)printf("%s\n", *cp ? cp + 1 : cp); 93 exit(0); 94 } 95 } 96 exit(1); 97 } 98 99 void 100 usage() 101 { 102 (void)fprintf(stderr, "usage: printenv [name]\n"); 103 exit(1); 104 } 105