1  /* Exit with a status code indicating success.
       2     Copyright (C) 1999-2023 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 <https://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  void
      36  usage (int status)
      37  {
      38    printf (_("\
      39  Usage: %s [ignored command line arguments]\n\
      40    or:  %s OPTION\n\
      41  "),
      42            program_name, program_name);
      43    printf ("%s\n\n",
      44            _(EXIT_STATUS == EXIT_SUCCESS
      45              ? N_("Exit with a status code indicating success.")
      46              : N_("Exit with a status code indicating failure.")));
      47    fputs (HELP_OPTION_DESCRIPTION, stdout);
      48    fputs (VERSION_OPTION_DESCRIPTION, stdout);
      49    printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
      50    emit_ancillary_info (PROGRAM_NAME);
      51    exit (status);
      52  }
      53  
      54  int
      55  main (int argc, char **argv)
      56  {
      57    /* Recognize --help or --version only if it's the only command-line
      58       argument.  */
      59    if (argc == 2)
      60      {
      61        initialize_main (&argc, &argv);
      62        set_program_name (argv[0]);
      63        setlocale (LC_ALL, "");
      64        bindtextdomain (PACKAGE, LOCALEDIR);
      65        textdomain (PACKAGE);
      66  
      67        /* Note true(1) will return EXIT_FAILURE in the
      68           edge case where writes fail with GNU specific options.  */
      69        atexit (close_stdout);
      70  
      71        if (STREQ (argv[1], "--help"))
      72          usage (EXIT_STATUS);
      73  
      74        if (STREQ (argv[1], "--version"))
      75          version_etc (stdout, PROGRAM_NAME, PACKAGE_NAME, Version, AUTHORS,
      76                       (char *) nullptr);
      77      }
      78  
      79    return EXIT_STATUS;
      80  }