Home | History | Annotate | Line # | Download | only in env
env.c revision 1.22 
      1 /*	$NetBSD: env.c,v 1.22 2020/02/08 10:36:02 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 1.22 2020/02/08 10:36:02 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;
     58 	char *cleanenv[1];
     59 	int ch;
     60 
     61 	setprogname(*argv);
     62 	(void)setlocale(LC_ALL, "");
     63 
     64 	while ((ch = getopt(argc, argv, "-iu:")) != -1)
     65 		switch((char)ch) {
     66 		case '-':			/* obsolete */
     67 		case 'i':
     68 			environ = cleanenv;
     69 			cleanenv[0] = NULL;
     70 			break;
     71 		case 'u':
     72 			if (unsetenv(optarg) == -1)
     73 				errx(EXIT_FAILURE, "unsetenv %s", optarg);
     74 			break;
     75 		case '?':
     76 		default:
     77 			usage();
     78 		}
     79 
     80 	for (argv += optind; *argv && strchr(*argv, '=') != NULL; ++argv)
     81 		(void)putenv(*argv);
     82 
     83 	if (*argv) {
     84 		/* return 127 if the command to be run could not be found; 126
     85 		   if the command was found but could not be invoked */
     86 
     87 		(void)execvp(*argv, argv);
     88 		err((errno == ENOENT) ? 127 : 126, "%s", *argv);
     89 		/* NOTREACHED */
     90 	}
     91 
     92 	for (ep = environ; *ep; ep++)
     93 		(void)printf("%s\n", *ep);
     94 
     95 	exit(0);
     96 }
     97 
     98 static void
     99 usage(void)
    100 {
    101 	(void)fprintf(stderr,
    102 	    "Usage: %s [-i] [-u name] [name=value ...] [command]\n",
    103 	    getprogname());
    104 	exit(1);
    105 }
    106