1 /* $NetBSD: env.c,v 1.23 2020/02/08 11:02:07 kamil Exp $ */ 2 /* 3 * Copyright (c) 1988, 1993, 1994 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #ifndef lint 33 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\ 34 The Regents of the University of California. All rights reserved."); 35 #endif /* not lint */ 36 37 #ifndef lint 38 /*static char sccsid[] = "@(#)env.c 8.3 (Berkeley) 4/2/94";*/ 39 __RCSID("$NetBSD: env.c,v 1.23 2020/02/08 11:02:07 kamil Exp $"); 40 #endif /* not lint */ 41 42 #include <err.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <stdlib.h> 46 #include <unistd.h> 47 #include <locale.h> 48 #include <errno.h> 49 50 static void usage(void) __dead; 51 52 extern char **environ; 53 54 int 55 main(int argc, char **argv) 56 { 57 char **ep, term; 58 char *cleanenv[1]; 59 int ch; 60 61 setprogname(*argv); 62 (void)setlocale(LC_ALL, ""); 63 64 term = '\n'; 65 while ((ch = getopt(argc, argv, "-0iu:")) != -1) 66 switch((char)ch) { 67 case '0': 68 term = '\0'; 69 break; 70 case '-': /* obsolete */ 71 case 'i': 72 environ = cleanenv; 73 cleanenv[0] = NULL; 74 break; 75 case 'u': 76 if (unsetenv(optarg) == -1) 77 errx(EXIT_FAILURE, "unsetenv %s", optarg); 78 break; 79 case '?': 80 default: 81 usage(); 82 } 83 84 for (argv += optind; *argv && strchr(*argv, '=') != NULL; ++argv) 85 (void)putenv(*argv); 86 87 if (*argv) { 88 /* return 127 if the command to be run could not be found; 126 89 if the command was found but could not be invoked; 125 if 90 -0 was specified with utility.*/ 91 92 if (term == '\0') 93 errx(125, "cannot specify command with -0"); 94 95 (void)execvp(*argv, argv); 96 err((errno == ENOENT) ? 127 : 126, "%s", *argv); 97 /* NOTREACHED */ 98 } 99 100 for (ep = environ; *ep; ep++) 101 (void)printf("%s%c", *ep, term); 102 103 exit(0); 104 } 105 106 static void 107 usage(void) 108 { 109 (void)fprintf(stderr, 110 "Usage: %s [-0i] [-u name] [name=value ...] [command]\n", 111 getprogname()); 112 exit(1); 113 } 114