env.c revision 147490
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. 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 35static const char copyright[] = 36"@(#) Copyright (c) 1988, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#if 0 41#ifndef lint 42static char sccsid[] = "@(#)env.c 8.3 (Berkeley) 4/2/94"; 43#endif /* not lint */ 44#endif 45 46#include <sys/cdefs.h> 47__FBSDID("$FreeBSD: head/usr.bin/env/env.c 147490 2005-06-20 03:06:54Z gad $"); 48 49#include <err.h> 50#include <errno.h> 51#include <stdio.h> 52#include <string.h> 53#include <stdlib.h> 54#include <unistd.h> 55 56extern char **environ; 57 58int env_verbosity; 59 60static void usage(void); 61 62int 63main(int argc, char **argv) 64{ 65 char **ep, *p, **parg; 66 char *cleanenv[1]; 67 int ch; 68 69 while ((ch = getopt(argc, argv, "-iv")) != -1) 70 switch(ch) { 71 case '-': 72 case 'i': 73 environ = cleanenv; 74 cleanenv[0] = NULL; 75 if (env_verbosity) 76 fprintf(stderr, "#env clearing environ\n"); 77 break; 78 case 'v': 79 env_verbosity++; 80 if (env_verbosity > 1) 81 fprintf(stderr, "#env verbosity now at %d\n", 82 env_verbosity); 83 break; 84 case '?': 85 default: 86 usage(); 87 } 88 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) { 89 if (env_verbosity) 90 fprintf(stderr, "#env setenv:\t%s\n", *argv); 91 (void)setenv(*argv, ++p, 1); 92 } 93 if (*argv) { 94 if (env_verbosity) { 95 fprintf(stderr, "#env executing:\t%s\n", *argv); 96 for (parg = argv, argc = 0; *parg; parg++, argc++) 97 fprintf(stderr, "#env arg[%d]=\t'%s'\n", 98 argc, *parg); 99 if (env_verbosity > 1) 100 sleep(1); 101 } 102 execvp(*argv, argv); 103 err(errno == ENOENT ? 127 : 126, "%s", *argv); 104 } 105 for (ep = environ; *ep; ep++) 106 (void)printf("%s\n", *ep); 107 exit(0); 108} 109 110static void 111usage(void) 112{ 113 (void)fprintf(stderr, 114 "usage: env [-iv] [name=value ...] [utility [argument ...]]\n"); 115 exit(1); 116} 117