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env.c revision 1.21 
      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 
     30 #include <sys/cdefs.h>
     31 #ifndef lint
     32 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\
     33  The Regents of the University of California.  All rights reserved.");
     34 #endif /* not lint */
     35 
     36 #ifndef lint
     37 /*static char sccsid[] = "@(#)env.c	8.3 (Berkeley) 4/2/94";*/
     38 __RCSID("$NetBSD: env.c,v 1.21 2020/02/08 10:30:22 kamil Exp $");
     39 #endif /* not lint */
     40 
     41 #include <err.h>
     42 #include <stdio.h>
     43 #include <string.h>
     44 #include <stdlib.h>
     45 #include <unistd.h>
     46 #include <locale.h>
     47 #include <errno.h>
     48 
     49 static void usage(void) __attribute__((__noreturn__));
     50 
     51 extern char **environ;
     52 
     53 int
     54 main(int argc, char **argv)
     55 {
     56 	char **ep;
     57 	char *cleanenv[1];
     58 	int ch;
     59 
     60 	setprogname(*argv);
     61 	(void)setlocale(LC_ALL, "");
     62 
     63 	while ((ch = getopt(argc, argv, "-iu:")) != -1)
     64 		switch((char)ch) {
     65 		case '-':			/* obsolete */
     66 		case 'i':
     67 			environ = cleanenv;
     68 			cleanenv[0] = NULL;
     69 			break;
     70 		case 'u':
     71 			if (unsetenv(optarg) == -1)
     72 				errx(EXIT_FAILURE, "unsetenv %s", optarg);
     73 			break;
     74 		case '?':
     75 		default:
     76 			usage();
     77 		}
     78 
     79 	for (argv += optind; *argv && strchr(*argv, '=') != NULL; ++argv)
     80 		(void)putenv(*argv);
     81 
     82 	if (*argv) {
     83 		/* return 127 if the command to be run could not be found; 126
     84 		   if the command was found but could not be invoked */
     85 
     86 		(void)execvp(*argv, argv);
     87 		err((errno == ENOENT) ? 127 : 126, "%s", *argv);
     88 		/* NOTREACHED */
     89 	}
     90 
     91 	for (ep = environ; *ep; ep++)
     92 		(void)printf("%s\n", *ep);
     93 
     94 	exit(0);
     95 }
     96 
     97 static void
     98 usage(void)
     99 {
    100 	(void)fprintf(stderr,
    101 	    "Usage: %s [-i] [-u name] [name=value ...] [command]\n",
    102 	    getprogname());
    103 	exit(1);
    104 }
    105