shell_cmds/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  * 4. 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 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1988, 1993, 1994\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif /* not lint */
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)env.c       8.3 (Berkeley) 4/2/94";
  39 #endif /* not lint */
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <err.h>
  46 #include <errno.h>
  47 #include <stdio.h>
  48 #include <string.h>
  49 #include <stdlib.h>
  50 #include <unistd.h>
  51
  52 #include <libiosexec.h>
  53
  54 #include "envopts.h"
  55
  56 extern char **environ;
  57
  58 int      env_verbosity;
  59
  60 static void usage(void);
  61
  62 int
  63 main(int argc, char **argv)
  64 {
  65         char *altpath, **ep, *p, **parg;
  66         char *cleanenv[1];
  67         int ch, want_clear;
  68         int rtrn;
  69
  70         altpath = NULL;
  71         want_clear = 0;
  72         while ((ch = getopt(argc, argv, "-iP:S:u:v")) != -1)
  73                 switch(ch) {
  74                 case '-':
  75                 case 'i':
  76                         want_clear = 1;
  77                         break;
  78                 case 'P':
  79                         altpath = strdup(optarg);
  80                         break;
  81                 case 'S':
  82                         /*
  83                          * The -S option, for "split string on spaces, with
  84                          * support for some simple substitutions"...
  85                          */
  86                         split_spaces(optarg, &optind, &argc, &argv);
  87                         break;
  88                 case 'u':
  89                         if (env_verbosity)
  90                                 fprintf(stderr, "#env unset:\t%s\n", optarg);
  91                         rtrn = unsetenv(optarg);
  92                         if (rtrn == -1)
  93                                 err(EXIT_FAILURE, "unsetenv %s", optarg);
  94                         break;
  95                 case 'v':
  96                         env_verbosity++;
  97                         if (env_verbosity > 1)
  98                                 fprintf(stderr, "#env verbosity now at %d\n",
  99                                     env_verbosity);
 100                         break;
 101                 case '?':
 102                 default:
 103                         usage();
 104                 }
 105         if (want_clear) {
 106                 environ = cleanenv;
 107                 cleanenv[0] = NULL;
 108                 if (env_verbosity)
 109                         fprintf(stderr, "#env clearing environ\n");
 110         }
 111         for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) {
 112                 if (env_verbosity)
 113                         fprintf(stderr, "#env setenv:\t%s\n", *argv);
 114                 *p = '\0';
 115                 rtrn = setenv(*argv, p + 1, 1);
 116                 *p = '=';
 117                 if (rtrn == -1)
 118                         err(EXIT_FAILURE, "setenv %s", *argv);
 119         }
 120         if (*argv) {
 121                 if (altpath)
 122                         search_paths(altpath, argv);
 123                 if (env_verbosity) {
 124                         fprintf(stderr, "#env executing:\t%s\n", *argv);
 125                         for (parg = argv, argc = 0; *parg; parg++, argc++)
 126                                 fprintf(stderr, "#env    arg[%d]=\t'%s'\n",
 127                                     argc, *parg);
 128                         if (env_verbosity > 1)
 129                                 sleep(1);
 130                 }
 131                 execvp(*argv, argv);
 132                 err(errno == ENOENT ? 127 : 126, "%s", *argv);
 133         }
 134         for (ep = environ; *ep; ep++)
 135                 (void)printf("%s\n", *ep);
 136         exit(0);
 137 }
 138
 139 static void
 140 usage(void)
 141 {
 142         (void)fprintf(stderr,
 143             "usage: env [-iv] [-P utilpath] [-S string] [-u name]\n"
 144             "           [name=value ...] [utility [argument ...]]\n");
 145         exit(1);
 146 }