1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1993 5 * The 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1987, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #if 0 39 #ifndef lint 40 static char sccsid[] = "@(#)printenv.c 8.2 (Berkeley) 5/4/95"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 #include <sys/types.h> 46 47 #include <capsicum_helpers.h> 48 #include <err.h> 49 #include <stdlib.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 void usage(void); 55 extern char **environ; 56 57 /* 58 * printenv 59 * 60 * Bill Joy, UCB 61 * February, 1979 62 */ 63 int 64 main(int argc, char *argv[]) 65 { 66 char *cp, **ep; 67 size_t len; 68 int ch; 69 70 if (caph_limit_stdio() < 0 || caph_enter() < 0) 71 err(1, "capsicum"); 72 73 while ((ch = getopt(argc, argv, "")) != -1) 74 switch(ch) { 75 case '?': 76 default: 77 usage(); 78 } 79 argc -= optind; 80 argv += optind; 81 82 if (argc == 0) { 83 for (ep = environ; *ep; ep++) 84 (void)printf("%s\n", *ep); 85 exit(0); 86 } 87 len = strlen(*argv); 88 for (ep = environ; *ep; ep++) 89 if (!memcmp(*ep, *argv, len)) { 90 cp = *ep + len; 91 if (*cp == '=') { 92 (void)printf("%s\n", cp + 1); 93 exit(0); 94 } 95 } 96 exit(1); 97 } 98 99 void 100 usage(void) 101 { 102 (void)fprintf(stderr, "usage: printenv [name]\n"); 103 exit(1); 104 } 105