env/env.c

   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. 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 #include <sys/cdefs.h>
  35 #ifndef lint
  36 __COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994\n\
  37         The Regents of the University of California.  All rights reserved.\n");
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 /*static char sccsid[] = "@(#)env.c     8.3 (Berkeley) 4/2/94";*/
  42 __RCSID("$NetBSD: env.c,v 1.10 1997/10/18 13:55:28 lukem Exp $");
  43 #endif /* not lint */
  44
  45 #include <err.h>
  46 #include <stdio.h>
  47 #include <string.h>
  48 #include <stdlib.h>
  49 #include <unistd.h>
  50 #include <locale.h>
  51 #include <errno.h>
  52
  53 int     main __P((int, char **));
  54 static void usage __P((void));
  55
  56 int
  57 main(argc, argv)
  58         int argc;
  59         char **argv;
  60 {
  61         extern char **environ;
  62         extern int optind;
  63         char **ep, *p;
  64         char *cleanenv[1];
  65         int ch;
  66
  67         setlocale(LC_ALL, "");
  68
  69         while ((ch = getopt(argc, argv, "-i")) != -1)
  70                 switch((char)ch) {
  71                 case '-':                       /* obsolete */
  72                 case 'i':
  73                         environ = cleanenv;
  74                         cleanenv[0] = NULL;
  75                         break;
  76                 case '?':
  77                 default:
  78                         usage();
  79                 }
  80
  81         for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv)
  82                 (void)setenv(*argv, ++p, 1);
  83
  84         if (*argv) {
  85                 /* return 127 if the command to be run could not be found; 126
  86                    if the command was was found but could not be invoked */
  87
  88                 execvp(*argv, argv);
  89                 err((errno == ENOENT) ? 127 : 126, "%s", *argv);
  90                 /* NOTREACHED */
  91         }
  92
  93         for (ep = environ; *ep; ep++)
  94                 (void)printf("%s\n", *ep);
  95
  96         exit(0);
  97 }
  98
  99 static void
 100 usage ()
 101 {
 102         (void) fprintf(stderr, "usage: env [-i] [name=value ...] [command]\n");
 103         exit (1);
 104 }