Line data    Source code

       1             : /* logname -- print user's login name
       2             :    Copyright (C) 1990-1997, 1999-2005, 2007 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 <http://www.gnu.org/licenses/>.  */
      16             : 
      17             : #include <config.h>
      18             : #include <stdio.h>
      19             : #include <sys/types.h>
      20             : #include <getopt.h>
      21             : 
      22             : #include "system.h"
      23             : #include "error.h"
      24             : #include "long-options.h"
      25             : #include "quote.h"
      26             : 
      27             : /* The official name of this program (e.g., no `g' prefix).  */
      28             : #define PROGRAM_NAME "logname"
      29             : 
      30             : #define AUTHORS "FIXME: unknown"
      31             : 
      32             : /* The name this program was run with. */
      33             : char *program_name;
      34             : 
      35             : void
      36          27 : usage (int status)
      37             : {
      38          27 :   if (status != EXIT_SUCCESS)
      39          25 :     fprintf (stderr, _("Try `%s --help' for more information.\n"),
      40             :              program_name);
      41             :   else
      42             :     {
      43           2 :       printf (_("Usage: %s [OPTION]\n"), program_name);
      44           2 :       fputs (_("\
      45             : Print the name of the current user.\n\
      46             : \n\
      47             : "), stdout);
      48           2 :       fputs (HELP_OPTION_DESCRIPTION, stdout);
      49           2 :       fputs (VERSION_OPTION_DESCRIPTION, stdout);
      50           2 :       emit_bug_reporting_address ();
      51             :     }
      52          27 :   exit (status);
      53             : }
      54             : 
      55             : int
      56          30 : main (int argc, char **argv)
      57             : {
      58             :   char *cp;
      59             : 
      60             :   initialize_main (&argc, &argv);
      61          30 :   program_name = argv[0];
      62          30 :   setlocale (LC_ALL, "");
      63             :   bindtextdomain (PACKAGE, LOCALEDIR);
      64             :   textdomain (PACKAGE);
      65             : 
      66          30 :   atexit (close_stdout);
      67             : 
      68          30 :   parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, VERSION,
      69             :                       usage, AUTHORS, (char const *) NULL);
      70          27 :   if (getopt_long (argc, argv, "", NULL, NULL) != -1)
      71           5 :     usage (EXIT_FAILURE);
      72             : 
      73          22 :   if (optind < argc)
      74             :     {
      75          20 :       error (0, 0, _("extra operand %s"), quote (argv[optind]));
      76          20 :       usage (EXIT_FAILURE);
      77             :     }
      78             : 
      79             :   /* POSIX requires using getlogin (or equivalent code).  */
      80           2 :   cp = getlogin ();
      81           2 :   if (cp)
      82             :     {
      83           0 :       puts (cp);
      84           0 :       exit (EXIT_SUCCESS);
      85             :     }
      86             :   /* POSIX prohibits using a fallback technique.  */
      87             : 
      88           2 :   error (0, 0, _("no login name"));
      89           2 :   exit (EXIT_FAILURE);
      90             : }