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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1987, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)printenv.c 8.2 (Berkeley) 5/4/95"; 43 #endif /* not lint */ 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 51 #include <stdlib.h> 52 #include <stdio.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 void usage(void); 57 58 /* 59 * printenv 60 * 61 * Bill Joy, UCB 62 * February, 1979 63 */ 64 int 65 main(argc, argv) 66 int argc; 67 char *argv[]; 68 { 69 extern char **environ; 70 register char *cp, **ep; 71 register size_t len; 72 int ch; 73 74 while ((ch = getopt(argc, argv, "")) != -1) 75 switch(ch) { 76 case '?': 77 default: 78 usage(); 79 } 80 argc -= optind; 81 argv += optind; 82 83 if (argc == 0) { 84 for (ep = environ; *ep; ep++) 85 (void)printf("%s\n", *ep); 86 exit(0); 87 } 88 len = strlen(*argv); 89 for (ep = environ; *ep; ep++) 90 if (!memcmp(*ep, *argv, len)) { 91 cp = *ep + len; 92 if (!*cp || *cp == '=') { 93 (void)printf("%s\n", *cp ? cp + 1 : cp); 94 exit(0); 95 } 96 } 97 exit(1); 98 } 99 100 void 101 usage() 102 { 103 (void)fprintf(stderr, "usage: printenv [name]\n"); 104 exit(1); 105 } 106