src/dirname.c

   1 /* dirname -- strip filename suffix from pathname
   2    Copyright (C) 1990-1997, 1999-2002, 2004 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 2, or (at your option)
   7    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, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by David MacKenzie and Jim Meyering. */
  19
  20 #include <config.h>
  21 #include <getopt.h>
  22 #include <stdio.h>
  23 #include <sys/types.h>
  24
  25 #include "system.h"
  26 #include "long-options.h"
  27 #include "error.h"
  28 #include "dirname.h"
  29 #include "quote.h"
  30
  31 /* The official name of this program (e.g., no `g' prefix).  */
  32 #define PROGRAM_NAME "dirname"
  33
  34 #define AUTHORS "David MacKenzie", "Jim Meyering"
  35
  36 /* The name this program was run with. */
  37 char *program_name;
  38
  39 void
  40 usage (int status)
  41 {
  42   if (status != EXIT_SUCCESS)
  43     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  44              program_name);
  45   else
  46     {
  47       printf (_("\
  48 Usage: %s NAME\n\
  49   or:  %s OPTION\n\
  50 "),
  51               program_name, program_name);
  52       fputs (_("\
  53 Print NAME with its trailing /component removed; if NAME contains no /'s,\n\
  54 output `.' (meaning the current directory).\n\
  55 \n\
  56 "), stdout);
  57       fputs (HELP_OPTION_DESCRIPTION, stdout);
  58       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  59       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  60     }
  61   exit (status);
  62 }
  63
  64 int
  65 main (int argc, char **argv)
  66 {
  67   static char const dot = '.';
  68   char const *result;
  69   size_t len;
  70
  71   initialize_main (&argc, &argv);
  72   program_name = argv[0];
  73   setlocale (LC_ALL, "");
  74   bindtextdomain (PACKAGE, LOCALEDIR);
  75   textdomain (PACKAGE);
  76
  77   atexit (close_stdout);
  78
  79   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
  80                       usage, AUTHORS, (char const *) NULL);
  81   if (getopt_long (argc, argv, "+", NULL, NULL) != -1)
  82     usage (EXIT_FAILURE);
  83
  84   if (argc < optind + 1)
  85     {
  86       error (0, 0, _("missing operand"));
  87       usage (EXIT_FAILURE);
  88     }
  89
  90   if (optind + 1 < argc)
  91     {
  92       error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
  93       usage (EXIT_FAILURE);
  94     }
  95
  96   result = argv[optind];
  97   len = dir_len (result);
  98
  99   if (! len)
 100     {
 101       result = &dot;
 102       len = 1;
 103     }
 104
 105   fwrite (result, 1, len, stdout);
 106   putchar ('\n');
 107
 108   exit (EXIT_SUCCESS);
 109 }