1 /* 2 * Copyright (c) 1988, 1993, 1994 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. 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 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved. 30 * @(#)env.c 8.3 (Berkeley) 4/2/94 31 * $FreeBSD: src/usr.bin/env/env.c,v 1.5.2.3 2002/06/26 08:23:36 tjr Exp $ 32 * $DragonFly: src/usr.bin/env/env.c,v 1.5 2006/01/12 13:43:10 corecode Exp $ 33 */ 34 35 #include <err.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <stdlib.h> 40 #include <unistd.h> 41 42 extern char **environ; 43 44 static void usage(void); 45 46 int 47 main(int argc, char **argv) 48 { 49 char **ep, *p; 50 char *cleanenv[1]; 51 int ch; 52 53 while ((ch = getopt(argc, argv, "-i")) != -1) 54 switch(ch) { 55 case '-': 56 case 'i': 57 environ = cleanenv; 58 cleanenv[0] = NULL; 59 break; 60 default: 61 usage(); 62 } 63 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) { 64 *p = '\0'; 65 if (setenv(*argv, p + 1, 1) == -1) 66 err(1, "setenv: cannot set %s=%s", *argv, p + 1); 67 *p = '='; 68 } 69 70 if (*argv) { 71 execvp(*argv, argv); 72 err(errno == ENOENT ? 127 : 126, "%s", *argv); 73 } 74 for (ep = environ; *ep; ep++) 75 printf("%s\n", *ep); 76 exit(0); 77 } 78 79 static void 80 usage(void) 81 { 82 fprintf(stderr, 83 "usage: env [-i] [name=value ...] [utility [argument ...]]\n"); 84 exit(1); 85 } 86