src/true.c

   1 /* Exit with a status code indicating success.
   2    Copyright (C) 1999-2003, 2005 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 2, or (at your option)
   7    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, write to the Free Software Foundation,
  16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  17
  18 #include <config.h>
  19 #include <stdio.h>
  20 #include <sys/types.h>
  21 #include "system.h"
  22
  23 /* Act like "true" by default; false.c overrides this.  */
  24 #ifndef EXIT_STATUS
  25 # define EXIT_STATUS EXIT_SUCCESS
  26 #endif
  27
  28 #if EXIT_STATUS == EXIT_SUCCESS
  29 # define PROGRAM_NAME "true"
  30 #else
  31 # define PROGRAM_NAME "false"
  32 #endif
  33
  34 #define AUTHORS "Jim Meyering"
  35
  36 /* The name this program was run with. */
  37 char *program_name;
  38
  39 void
  40 usage (int status)
  41 {
  42   printf (_("\
  43 Usage: %s [ignored command line arguments]\n\
  44   or:  %s OPTION\n\
  45 "),
  46           program_name, program_name);
  47   printf ("%s\n\n",
  48           _(EXIT_STATUS == EXIT_SUCCESS
  49             ? "Exit with a status code indicating success."
  50             : "Exit with a status code indicating failure."));
  51   fputs (HELP_OPTION_DESCRIPTION, stdout);
  52   fputs (VERSION_OPTION_DESCRIPTION, stdout);
  53   printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
  54   printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  55   exit (status);
  56 }
  57
  58 int
  59 main (int argc, char **argv)
  60 {
  61   initialize_main (&argc, &argv);
  62   program_name = argv[0];
  63   setlocale (LC_ALL, "");
  64   bindtextdomain (PACKAGE, LOCALEDIR);
  65   textdomain (PACKAGE);
  66
  67   atexit (close_stdout);
  68
  69   /* Recognize --help or --version only if it's the only command-line
  70      argument.  */
  71   if (argc == 2)
  72     {
  73       if (STREQ (argv[1], "--help"))
  74         usage (EXIT_STATUS);
  75
  76       if (STREQ (argv[1], "--version"))
  77         version_etc (stdout, PROGRAM_NAME, GNU_PACKAGE, VERSION, AUTHORS,
  78                      (char *) NULL);
  79     }
  80
  81   exit (EXIT_STATUS);
  82 }