1 /* 2 * Copyright (c) 1987, 1993 3 * The Regents of the University of California. 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 * @(#) Copyright (c) 1987, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)printenv.c 8.2 (Berkeley) 5/4/95 35 * 36 * $DragonFly: src/usr.bin/printenv/printenv.c,v 1.4 2005/01/07 02:32:50 cpressey Exp $ 37 */ 38 39 #include <sys/types.h> 40 41 #include <stdlib.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 extern char **environ; 47 48 static void usage(void); 49 50 /* 51 * printenv 52 * 53 * Bill Joy, UCB 54 * February, 1979 55 */ 56 int 57 main(int argc, char **argv) 58 { 59 char *cp, **ep; 60 size_t len; 61 int ch; 62 63 while ((ch = getopt(argc, argv, "")) != -1) { 64 switch(ch) { 65 case '?': 66 default: 67 usage(); 68 } 69 } 70 argc -= optind; 71 argv += optind; 72 73 if (argc == 0) { 74 for (ep = environ; *ep != NULL; ep++) 75 printf("%s\n", *ep); 76 exit(0); 77 } 78 len = strlen(*argv); 79 for (ep = environ; *ep != NULL; ep++) { 80 cp = strchr(*ep, '='); 81 if (cp == *ep + len) { 82 if (memcmp(*ep, *argv, len) == 0) { 83 printf("%s\n", cp + 1); 84 exit(0); 85 } 86 } 87 } 88 exit(1); 89 } 90 91 static void 92 usage(void) 93 { 94 fprintf(stderr, "usage: printenv [name]\n"); 95 exit(1); 96 } 97