mirror of
git://git.sv.gnu.org/coreutils
synced 2026-06-04 14:55:00 -04:00
Jim Meyering
57a460665c
(main): Use initialize_exit_failure rather than setting exit_failure directly; this optimizes away redundant assignments. (PRINTENV_FAILURE): New constant. (main): Exit with status PRINTENV_FAILURE, not EXIT_FAILURE, on command-line syntax problems.
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/* printenv -- print all or part of environment
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Copyright (C) 1989-1997, 1999-2004 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Usage: printenv [variable...]
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If no arguments are given, print the entire environment.
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If one or more variable names are given, print the value of
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each one that is set, and nothing for ones that are not set.
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Exit status:
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0 if all variables specified were found
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1 if not
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2 if some other error occurred
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David MacKenzie and Richard Mlynarik */
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#include <config.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <getopt.h>
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#include "system.h"
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#include "error.h"
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#include "long-options.h"
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/* Exit status for syntax errors, etc. */
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enum { PRINTENV_FAILURE = 2 };
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/* The official name of this program (e.g., no `g' prefix). */
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#define PROGRAM_NAME "printenv"
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#define AUTHORS "David MacKenzie", "Richard Mlynarik"
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/* The name this program was run with. */
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char *program_name;
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static struct option const long_options[] =
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{
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{0, 0, 0, 0}
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};
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extern char **environ;
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void
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usage (int status)
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{
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if (status != EXIT_SUCCESS)
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fprintf (stderr, _("Try `%s --help' for more information.\n"),
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program_name);
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else
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{
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printf (_("\
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Usage: %s [VARIABLE]...\n\
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or: %s OPTION\n\
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If no environment VARIABLE specified, print them all.\n\
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\n\
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"),
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program_name, program_name);
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fputs (HELP_OPTION_DESCRIPTION, stdout);
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fputs (VERSION_OPTION_DESCRIPTION, stdout);
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printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
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}
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exit (status);
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}
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int
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main (int argc, char **argv)
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{
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char **env;
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char *ep, *ap;
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int i;
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int matches = 0;
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int c;
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int exit_status;
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initialize_main (&argc, &argv);
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program_name = argv[0];
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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initialize_exit_failure (PRINTENV_FAILURE);
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atexit (close_stdout);
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parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
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usage, AUTHORS, (char const *) NULL);
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while ((c = getopt_long (argc, argv, "", long_options, NULL)) != -1)
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{
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switch (c)
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{
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case 0:
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break;
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default:
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usage (PRINTENV_FAILURE);
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}
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}
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if (optind >= argc)
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{
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for (env = environ; *env != NULL; ++env)
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puts (*env);
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exit_status = EXIT_SUCCESS;
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}
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else
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{
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for (i = optind; i < argc; ++i)
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{
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for (env = environ; *env; ++env)
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{
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ep = *env;
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ap = argv[i];
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while (*ep != '\0' && *ap != '\0' && *ep++ == *ap++)
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{
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if (*ep == '=' && *ap == '\0')
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{
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puts (ep + 1);
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++matches;
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break;
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}
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}
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}
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}
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exit_status = (matches != argc - optind);
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}
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exit (exit_status);
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}
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