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/* hello.c -- print a greeting message and exit.
Copyright 1992-2024 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <getopt.h>
#include <stdnoreturn.h>
#include <wchar.h>
#include "system.h"
#include "closeout.h"
#include "configmake.h"
#include "dirname.h"
#include "errno.h"
#include "error.h"
#include "gettext.h"
#include "progname.h"
#include "propername.h"
#include "version-etc.h"
#include "xalloc.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "hello"
#define AUTHORS \
proper_name ("Karl Berry"), \
proper_name ("Sami Kerola"), \
proper_name ("Jim Meyering"), \
proper_name ("Reuben Thomas")
/* Print help info. This long message is split into
several pieces to help translators be able to align different
blocks and identify the various pieces. */
static _Noreturn void
print_help (FILE *restrict out)
{
const char *lc_messages = setlocale (LC_MESSAGES, NULL);
/* TRANSLATORS: --help output 1 (synopsis)
no-wrap */
fprintf (out, _("Usage: %s [OPTION]...\n"), program_name);
/* TRANSLATORS: --help output 2 (brief description)
no-wrap */
fputs (_("Print a friendly, customizable greeting.\n"), out);
fputs ("\n", out);
/* TRANSLATORS: --help output 3: options
no-wrap */
fputs (_(" -t, --traditional use traditional greeting\n"), out);
fputs (_(" -g, --greeting=TEXT use TEXT as the greeting message\n"), out);
fputs ("\n", out);
fputs (_(" --help display this help and exit\n"), out);
fputs (_(" --version output version information and exit\n"), out);
emit_bug_reporting_address();
/* Don't output this redundant message for English locales.
Note we still output for 'C' so that it gets included in the man page. */
if (lc_messages && STRNCMP_LIT (lc_messages, "en_"))
{
/* TRANSLATORS: Replace LANG_CODE in this URL with your language code
<https://translationproject.org/team/LANG_CODE.html> to form one of
the URLs at https://translationproject.org/team/. Otherwise, replace
the entire URL with your translation team's email address. */
fprintf (out, _("Report %s translation bugs to "
"<https://translationproject.org/team/>\n"), PACKAGE_NAME);
}
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void
parse_options (int argc, char *argv[], const char **greeting_msg)
{
int optc;
int lose = 0;
enum {
OPT_HELP = CHAR_MAX + 1,
OPT_VERSION
};
static const struct option longopts[] = {
{"greeting", required_argument, NULL, 'g'},
{"traditional", no_argument, NULL, 't'},
{"help", no_argument, NULL, OPT_HELP},
{"version", no_argument, NULL, OPT_VERSION},
{NULL, 0, NULL, 0}
};
while ((optc = getopt_long (argc, argv, "g:t", longopts, NULL)) != -1)
switch (optc)
{
/* --help and --version exit immediately, per GNU coding standards. */
case OPT_VERSION:
version_etc (stdout, PROGRAM_NAME, PACKAGE_NAME, PACKAGE_VERSION, AUTHORS, (char *) NULL);
exit (EXIT_SUCCESS);
case 'g':
*greeting_msg = optarg;
break;
case OPT_HELP:
print_help (stdout);
case 't':
*greeting_msg = _("hello, world");
break;
default:
lose = 1;
break;
}
if (lose || optind < argc)
{
/* Print error message and exit. */
if (argv[optind])
error (0, 0, "%s: %s", _("extra operand"), argv[optind]);
emit_try_help ();
exit (EXIT_FAILURE);
}
}
int
main (int argc, char *argv[])
{
const char *greeting_msg;
wchar_t *mb_greeting;
mbstate_t mbstate = { 0, };
size_t len;
set_program_name (argv[0]);
/* Set locale via LC_ALL. */
setlocale (LC_ALL, "");
#if ENABLE_NLS
/* Set the text message domain. */
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
#endif
/* Having initialized gettext, get the default message. */
greeting_msg = _("Hello, world!");
/* Even exiting has subtleties. On exit, if any writes failed, change
the exit status. The /dev/full device on GNU/Linux can be used for
testing; for instance, hello >/dev/full should exit unsuccessfully.
This is implemented in the Gnulib module "closeout". */
atexit (close_stdout);
parse_options(argc, argv, &greeting_msg);
len = strlen(greeting_msg) + 1;
mb_greeting = xmalloc(len * sizeof(wchar_t));
len = mbsrtowcs(mb_greeting, &greeting_msg, len, &mbstate);
if (len == (size_t)-1)
error (EXIT_FAILURE, errno, _("conversion to a multibyte string failed"));
/* Print greeting message and exit. */
wprintf (L"%ls\n", mb_greeting);
free(mb_greeting);
exit (EXIT_SUCCESS);
}
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