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