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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1987, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #if 0 37 #ifndef lint 38 static char sccsid[] = "@(#)printenv.c 8.2 (Berkeley) 5/4/95"; 39 #endif /* not lint */ 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/types.h> 46 47 #include <stdlib.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <unistd.h> 51 52 void usage(void); 53 extern char **environ; 54 55 /* 56 * printenv 57 * 58 * Bill Joy, UCB 59 * February, 1979 60 */ 61 int 62 main(int argc, char *argv[]) 63 { 64 char *cp, **ep; 65 size_t len; 66 int ch; 67 68 while ((ch = getopt(argc, argv, "")) != -1) 69 switch(ch) { 70 case '?': 71 default: 72 usage(); 73 } 74 argc -= optind; 75 argv += optind; 76 77 if (argc == 0) { 78 for (ep = environ; *ep; ep++) 79 (void)printf("%s\n", *ep); 80 exit(0); 81 } 82 len = strlen(*argv); 83 for (ep = environ; *ep; ep++) 84 if (!memcmp(*ep, *argv, len)) { 85 cp = *ep + len; 86 if (!*cp || *cp == '=') { 87 (void)printf("%s\n", *cp ? cp + 1 : cp); 88 exit(0); 89 } 90 } 91 exit(1); 92 } 93 94 void 95 usage(void) 96 { 97 (void)fprintf(stderr, "usage: printenv [name]\n"); 98 exit(1); 99 } 100