src/true.c

   1 /* Exit with a status code indicating success.
   2    Copyright (C) 1999-2003, 2005, 2007 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18 #include <stdio.h>
  19 #include <sys/types.h>
  20 #include "system.h"
  21
  22 /* Act like "true" by default; false.c overrides this.  */
  23 #ifndef EXIT_STATUS
  24 # define EXIT_STATUS EXIT_SUCCESS
  25 #endif
  26
  27 #if EXIT_STATUS == EXIT_SUCCESS
  28 # define PROGRAM_NAME "true"
  29 #else
  30 # define PROGRAM_NAME "false"
  31 #endif
  32
  33 #define AUTHORS proper_name ("Jim Meyering")
  34
  35 /* The name this program was run with. */
  36 char *program_name;
  37
  38 void
  39 usage (int status)
  40 {
  41   printf (_("\
  42 Usage: %s [ignored command line arguments]\n\
  43   or:  %s OPTION\n\
  44 "),
  45           program_name, program_name);
  46   printf ("%s\n\n",
  47           _(EXIT_STATUS == EXIT_SUCCESS
  48             ? "Exit with a status code indicating success."
  49             : "Exit with a status code indicating failure."));
  50   fputs (HELP_OPTION_DESCRIPTION, stdout);
  51   fputs (VERSION_OPTION_DESCRIPTION, stdout);
  52   printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
  53   emit_bug_reporting_address ();
  54   exit (status);
  55 }
  56
  57 int
  58 main (int argc, char **argv)
  59 {
  60   initialize_main (&argc, &argv);
  61   program_name = argv[0];
  62   setlocale (LC_ALL, "");
  63   bindtextdomain (PACKAGE, LOCALEDIR);
  64   textdomain (PACKAGE);
  65
  66   atexit (close_stdout);
  67
  68   /* Recognize --help or --version only if it's the only command-line
  69      argument.  */
  70   if (argc == 2)
  71     {
  72       if (STREQ (argv[1], "--help"))
  73         usage (EXIT_STATUS);
  74
  75       if (STREQ (argv[1], "--version"))
  76         version_etc (stdout, PROGRAM_NAME, PACKAGE_NAME, VERSION, AUTHORS,
  77                      (char *) NULL);
  78     }
  79
  80   exit (EXIT_STATUS);
  81 }