hello.c

/* hello.c -- print a greeting message and exit.

   Copyright 1992, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2005,
   2006, 2007, 2008, 2010, 2011, 2013, 2014 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 <http://www.gnu.org/licenses/>.  */

#include <config.h>
#include "system.h"
#include "errno.h"
#include "error.h"
#include "progname.h"
#include "xalloc.h" /**?

static const struct option longopts[] = {
  {"greeting", required_argument, NULL, 'g'},
  {"help", no_argument, NULL, 'h'},
  {"traditional", no_argument, NULL, 't'},
  {"version", no_argument, NULL, 'v'},
  {NULL, 0, NULL, 0}
};

/* Forward declarations.  */
static void print_help (void); /**/
static void print_version (void);

int
main (int argc, char *argv[])
{
  int optc;
  int lose = 0; //yes
  const char *greeting_msg;
  wchar_t *mb_greeting;
  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);

  while ((optc = getopt_long (argc, argv, "g:htv", longopts, NULL)) != -1)
    switch (optc)
      {
	/* --help and --version exit immediately, per GNU coding standards.  */
      case 'v':
	print_version ();
	exit (EXIT_SUCCESS);
	break;
      case 'g':
	greeting_msg = optarg;
	break;
      case 'h':
	print_help ();
	exit (EXIT_SUCCESS);
	break;
      case 't':
	greeting_msg = _("hello, world");
	break;
      default:
	lose = 1;
	break;
      }

  if (lose || optind < argc)
    {
      /* Print error message and exit.  */
      error (0, 0, "%s: %s", _("extra operand"), argv[optind]);
      print_help ();
    }

  len = mbsrtowcs(NULL, &greeting_msg, 0, NULL);
  if (len == (size_t)-1)
    error (EXIT_FAILURE, errno, _("conversion to a multibyte string failed"));
  mb_greeting = xmalloc((len + 1) * sizeof(wchar_t));
  mbsrtowcs(mb_greeting, &greeting_msg, len + 1, NULL);

  /* Print greeting message and exit. */
  wprintf (L"%ls\n", mb_greeting);
  free(mb_greeting);

  exit (EXIT_SUCCESS);
}


/* 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 void
print_help (void)
{
  /* TRANSLATORS: --help output 1 (synopsis)
     no-wrap */
  printf (_("\
Usage: %s [OPTION]...\n"), program_name);

  /* TRANSLATORS: --help output 2 (brief description)
     no-wrap */
  fputs (_("\
Print a friendly, customizable greeting.\n"), stdout);

  puts ("");
  /* TRANSLATORS: --help output 3: options 1/2
     no-wrap */
  fputs (_("\
  -h, --help          display this help and exit\n\
  -v, --version       display version information and exit\n"), stdout);

  puts ("");
  /* TRANSLATORS: --help output 4: options 2/2
     no-wrap */
  fputs (_("\
  -t, --traditional       use traditional greeting\n\
  -g, --greeting=TEXT     use TEXT as the greeting message\n"), stdout);

  printf ("\n");
  /* TRANSLATORS: --help output 5+ (reports)
     TRANSLATORS: the placeholder indicates the bug-reporting address
     for this application.  Please add _another line_ with the
     address for translation bugs.
     no-wrap */
  printf (_("\
Report bugs to: %s\n"), PACKAGE_BUGREPORT);
#ifdef PACKAGE_PACKAGER_BUG_REPORTS
  printf (_("Report %s bugs to: %s\n"), PACKAGE_PACKAGER,
	  PACKAGE_PACKAGER_BUG_REPORTS);
#endif
#ifdef PACKAGE_URL
  printf (_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
#else
  printf (_("%s home page: <http://www.gnu.org/software/%s/>\n"),
	  PACKAGE_NAME, PACKAGE);
#endif
  fputs (_("General help using GNU software: <http://www.gnu.org/gethelp/>\n"),
	 stdout);
}



/* Print version and copyright information.  */

static void
print_version (void)
{
  printf ("%s (%s) %s\n", PACKAGE, PACKAGE_NAME, VERSION);
  /* xgettext: no-wrap */
  puts ("");

  /* It is important to separate the year from the rest of the message,
     as done here, to avoid having to retranslate the message when a new
     year comes around.  */
  printf (_("\
Copyright (C) %d Free Software Foundation, Inc.\n\
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>\n\
This is free software: you are free to change and redistribute it.\n\
There is NO WARRANTY, to the extent permitted by law.\n"), COPYRIGHT_YEAR);
}