bin/env/env.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (c) 2012, Joyent, Inc. All rights reserved.
  24  */
  25 /*
  26  * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
  27  */
  28
  29 /*
  30  * Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
  31  *        All Rights Reserved
  32  */
  33
  34 /*
  35  *      env [ - ] [ name=value ]... [command arg...]
  36  *      set environment, then execute command (or print environment)
  37  *      - says start fresh, otherwise merge with inherited environment
  38  */
  39
  40 #include <stdio.h>
  41 #include <string.h>
  42 #include <stdlib.h>
  43 #include <errno.h>
  44 #include <unistd.h>
  45 #include <limits.h>
  46 #include <ctype.h>
  47 #include <locale.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51
  52 static  void    Usage();
  53 extern  char    **environ;
  54
  55
  56 int
  57 main(int argc, char **argv)
  58 {
  59         char    **p;
  60         int     opt;
  61         int     i;
  62
  63
  64         (void) setlocale(LC_ALL, "");
  65
  66 #if     !defined(TEXT_DOMAIN)   /* Should be defined by cc -D */
  67 #define TEXT_DOMAIN "SYS_TEST"  /* Use this only if it weren't */
  68 #endif
  69         (void) textdomain(TEXT_DOMAIN);
  70
  71         /* check for non-standard "-" option */
  72         if ((argc > 1) && (strcmp(argv[1], "-")) == 0) {
  73                 (void) clearenv();
  74                 for (i = 1; i < argc; i++)
  75                         argv[i] = argv[i+1];
  76                 argc--;
  77         }
  78
  79         /* get options */
  80         while ((opt = getopt(argc, argv, "i")) != EOF) {
  81                 switch (opt) {
  82                 case 'i':
  83                         (void) clearenv();
  84                         break;
  85
  86                 default:
  87                         Usage();
  88                 }
  89         }
  90
  91         /* get environment strings */
  92         while (argv[optind] != NULL && strchr(argv[optind], '=') != NULL) {
  93                 if (putenv(argv[optind])) {
  94                         (void) perror(argv[optind]);
  95                         exit(1);
  96                 }
  97                 optind++;
  98         }
  99
 100         /* if no utility, output environment strings */
 101         if (argv[optind] == NULL) {
 102                 p = environ;
 103                 while (*p != NULL)
 104                         (void) puts(*p++);
 105         } else {
 106                 (void) execvp(argv[optind],  &argv[optind]);
 107                 (void) fprintf(stderr, "%s: %s: %s\n", argv[0], argv[optind],
 108                     strerror(errno));
 109                 exit(((errno == ENOENT) || (errno == ENOTDIR)) ? 127 : 126);
 110         }
 111         return (0);
 112 }
 113
 114
 115 static  void
 116 Usage()
 117 {
 118         (void) fprintf(stderr, gettext(
 119             "Usage: env [-i] [name=value ...] [utility [argument ...]]\n"
 120             "       env [-] [name=value ...] [utility [argument ...]]\n"));
 121         exit(1);
 122 }