1 /* $NetBSD: printenv.c,v 1.5 1997/01/09 15:17:32 tls Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993 5 * 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 #ifndef lint 37 static char copyright[] = 38 "@(#) 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 static char rcsid[] = "$NetBSD: printenv.c,v 1.5 1997/01/09 15:17:32 tls 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 void usage __P((void)); 55 56 /* 57 * printenv 58 * 59 * Bill Joy, UCB 60 * February, 1979 61 */ 62 int 63 main(argc, argv) 64 int argc; 65 char *argv[]; 66 { 67 extern char **environ; 68 char *cp, **ep; 69 size_t len; 70 int ch; 71 72 while ((ch = getopt(argc, argv, "")) != EOF) 73 switch(ch) { 74 case '?': 75 default: 76 usage(); 77 } 78 argc -= optind; 79 argv += optind; 80 81 if (argc == 0) { 82 for (ep = environ; *ep; ep++) 83 (void)printf("%s\n", *ep); 84 exit(0); 85 } 86 len = strlen(*argv); 87 for (ep = environ; *ep; ep++) 88 if (!memcmp(*ep, *argv, len)) { 89 cp = *ep + len; 90 if (!*cp || *cp == '=') { 91 (void)printf("%s\n", *cp ? cp + 1 : cp); 92 exit(0); 93 } 94 } 95 exit(1); 96 } 97 98 void 99 usage() 100 { 101 (void)fprintf(stderr, "usage: printenv [name]\n"); 102 exit(1); 103 } 104