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
usage(int status)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
main(int argc,char ** argv)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 }
81