1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993, 1994 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) 1988, 1993, 1994\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[] = "@(#)env.c 8.3 (Berkeley) 4/2/94"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <err.h> 48 #include <errno.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 54 #include "envopts.h" 55 56 extern char **environ; 57 58 int env_verbosity; 59 60 static void usage(void); 61 62 /* 63 * Exit codes. 64 */ 65 #define EXIT_CANCELED 125 /* Internal error prior to exec attempt. */ 66 #define EXIT_CANNOT_INVOKE 126 /* Program located, but not usable. */ 67 #define EXIT_ENOENT 127 /* Could not find program to exec. */ 68 69 int 70 main(int argc, char **argv) 71 { 72 char *altpath, **ep, *p, **parg, term; 73 char *cleanenv[1]; 74 int ch, want_clear; 75 int rtrn; 76 77 altpath = NULL; 78 want_clear = 0; 79 term = '\n'; 80 while ((ch = getopt(argc, argv, "-0iP:S:u:v")) != -1) 81 switch(ch) { 82 case '-': 83 case 'i': 84 want_clear = 1; 85 break; 86 case '0': 87 term = '\0'; 88 break; 89 case 'P': 90 altpath = strdup(optarg); 91 break; 92 case 'S': 93 /* 94 * The -S option, for "split string on spaces, with 95 * support for some simple substitutions"... 96 */ 97 split_spaces(optarg, &optind, &argc, &argv); 98 break; 99 case 'u': 100 if (env_verbosity) 101 fprintf(stderr, "#env unset:\t%s\n", optarg); 102 rtrn = unsetenv(optarg); 103 if (rtrn == -1) 104 err(EXIT_FAILURE, "unsetenv %s", optarg); 105 break; 106 case 'v': 107 env_verbosity++; 108 if (env_verbosity > 1) 109 fprintf(stderr, "#env verbosity now at %d\n", 110 env_verbosity); 111 break; 112 case '?': 113 default: 114 usage(); 115 } 116 if (want_clear) { 117 environ = cleanenv; 118 cleanenv[0] = NULL; 119 if (env_verbosity) 120 fprintf(stderr, "#env clearing environ\n"); 121 } 122 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) { 123 if (env_verbosity) 124 fprintf(stderr, "#env setenv:\t%s\n", *argv); 125 *p = '\0'; 126 rtrn = setenv(*argv, p + 1, 1); 127 *p = '='; 128 if (rtrn == -1) 129 err(EXIT_FAILURE, "setenv %s", *argv); 130 } 131 if (*argv) { 132 if (term == '\0') 133 errx(EXIT_CANCELED, "cannot specify command with -0"); 134 if (altpath) 135 search_paths(altpath, argv); 136 if (env_verbosity) { 137 fprintf(stderr, "#env executing:\t%s\n", *argv); 138 for (parg = argv, argc = 0; *parg; parg++, argc++) 139 fprintf(stderr, "#env arg[%d]=\t'%s'\n", 140 argc, *parg); 141 if (env_verbosity > 1) 142 sleep(1); 143 } 144 execvp(*argv, argv); 145 err(errno == ENOENT ? EXIT_ENOENT : EXIT_CANNOT_INVOKE, 146 "%s", *argv); 147 } 148 for (ep = environ; *ep; ep++) 149 (void)printf("%s%c", *ep, term); 150 exit(0); 151 } 152 153 static void 154 usage(void) 155 { 156 (void)fprintf(stderr, 157 "usage: env [-0iv] [-P utilpath] [-S string] [-u name]\n" 158 " [name=value ...] [utility [argument ...]]\n"); 159 exit(1); 160 } 161