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电梯直达

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发表于 2008-05-12 21:41 |只看该作者 |倒序浏览

/*下面给出的代码是GNU写的hello的小程序！看看那位高手能把它编译并运行！
当然最好给出详细的过程！能把hello写到如此份上，真是学到了很多！
*/
/* hello.c -- print a greeting message and exit.

Copyright (C) 1992, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
2005, 2006 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 2, 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, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#include <config.h>
#include "system.h"

/* String containing name the program is called with.  */
const char *program_name;

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

static void print_help (void);
static void print_version (void);

int
main (int argc, char *argv[])
{
  int optc;
  int t = 0, n = 0, lose = 0;
  const char *greeting = NULL;

  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

  /* Even exiting has subtleties.  The /dev/full device on GNU/Linux
   can be used for testing whether writes are checked properly.  For
   instance, hello >/dev/null should exit unsuccessfully.  On exit,
   if any writes failed, change the exit status.  This is
   implemented in the Gnulib module "closeout".  */
  atexit (close_stdout);

  while ((optc = getopt_long (argc, argv, "g:hntv", longopts, NULL)) != -1)
switch (optc)
   {
   /* One goal here is having --help and --version exit immediately,
      per GNU coding standards.  */
   case 'v':
      print_version ();
      exit (EXIT_SUCCESS);
      break;
   case 'g':
      greeting = optarg;
      break;
   case 'h':
      print_help ();
      exit (EXIT_SUCCESS);
      break;
   case 'n':
      n = 1;
      break;
   case 't':
      t = 1;
      break;
   default:
      lose = 1;
      break;
   }

  if (lose || optind < argc)
{
   /* Print error message and exit.  */
   if (optind < argc)
      fprintf (stderr, _("%s: extra operand: %s\n"

,
program_name, argv[optind]);
fprintf (stderr, _("Try `%s --help' for more information.\n"

,
            program_name);
   exit (EXIT_FAILURE);
}

  /* Print greeting message and exit. */
  if (t)
printf (_("hello, world\n"

);

else if (n)
/* TRANSLATORS: Use box drawing characters or other fancy stuff
if your encoding (e.g., UTF-

allows it.  If done so add the
   following note, please:

   [Note: For best viewing results use a UTF-8 locale, please.]
*/
      printf (_("\
+---------------+\n\
| Hello, world! |\n\
+---------------+\n\
"

);

  else
{
   if (!greeting)
      greeting = _("Hello, world!"

;
   puts (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 format\n\
  -n, --next-generation use next-generation greeting format\n\
  -g, --greeting=TEXT    use TEXT as the greeting message\n"), stdout);

  printf ("\n");
  /* TRANSLATORS: --help output 5 (end)
   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);
}

/* Print version and copyright information.  */

static void
print_version (void)
{
  printf ("hello (GNU %s) %s\n", PACKAGE, 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) %s Free Software Foundation, Inc.\n\
License: GNU GPL v2+ <http://www.gnu.org/licenses/gpl.html>\n\
This is free software.  There is NO WARRANTY, to the extent permitted by law.\n"), "2006");
}