usr.bin/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. 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 1.16 2006/01/04 01:05:19 perry 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 int     main(int, char **);
  50 static void usage(void);
  51
  52 extern char **environ;
  53
  54 int
  55 main(int argc, char **argv)
  56 {
  57         char **ep, *p;
  58         char *cleanenv[1];
  59         int ch;
  60
  61         setlocale(LC_ALL, "");
  62
  63         while ((ch = getopt(argc, argv, "-i")) != -1)
  64                 switch((char)ch) {
  65                 case '-':                       /* obsolete */
  66                 case 'i':
  67                         environ = cleanenv;
  68                         cleanenv[0] = NULL;
  69                         break;
  70                 case '?':
  71                 default:
  72                         usage();
  73                 }
  74
  75         for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv)
  76                 (void)setenv(*argv, ++p, 1);
  77
  78         if (*argv) {
  79                 /* return 127 if the command to be run could not be found; 126
  80                    if the command was was found but could not be invoked */
  81
  82                 execvp(*argv, argv);
  83                 err((errno == ENOENT) ? 127 : 126, "%s", *argv);
  84                 /* NOTREACHED */
  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(void)
  95 {
  96         (void)fprintf(stderr, "usage: env [-i] [name=value ...] [command]\n");
  97         exit(1);
  98 }