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env.c revision 1.3 
      1 /*
      2  * Copyright (c) 1988 The Regents of the University of California.
      3  * 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
     35 char copyright[] =
     36 "@(#) Copyright (c) 1988 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)env.c	5.3 (Berkeley) 6/1/90";*/
     42 static char rcsid[] = "$Id: env.c,v 1.3 1993/08/01 18:16:49 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <stdio.h>
     46 #include <string.h>
     47 #include <errno.h>
     48 
     49 static void usage();
     50 
     51 main(argc, argv)
     52 	int argc;
     53 	char **argv;
     54 {
     55 	extern char **environ;
     56 	extern int errno, optind;
     57 	register char **ep, *p;
     58 	char *cleanenv[1];
     59 	int ch;
     60 
     61 	while ((ch = getopt(argc, argv, "-i")) != EOF)
     62 		switch((char)ch) {
     63 		case '-':			/* obsolete */
     64 		case 'i':
     65 			environ = cleanenv;
     66 			cleanenv[0] = NULL;
     67 			break;
     68 		case '?':
     69 		default:
     70 			usage();
     71 		}
     72 
     73 	for (argv += optind; *argv && (p = index(*argv, '=')); ++argv)
     74 		(void)setenv(*argv, ++p, 1);
     75 
     76 	if (*argv) {
     77 		/* return 127 if the command to be run could not be found; 126
     78 		   if the command was was found but could not be invoked */
     79 		int status;
     80 
     81 		execvp(*argv, argv);
     82 		status = (errno == ENOENT) ? 127 : 126;
     83 		(void)fprintf(stderr, "env: %s: %s\n", *argv, strerror(errno));
     84 		exit(status);
     85 	}
     86 
     87 	for (ep = environ; *ep; ep++)
     88 		(void)printf("%s\n", *ep);
     89 
     90 	exit(0);
     91 }
     92 
     93 static void
     94 usage ()
     95 {
     96 	(void) fprintf(stderr, "usage: env [-i] [name=value ...] [command]\n");
     97 	exit (1);
     98 }
     99