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 <stdio.h>
  22 #include <sys/types.h>
  23
  24 #include "system.h"
  25 #include "long-options.h"
  26 #include "error.h"
  27 #include "dirname.h"
  28
  29 /* The official name of this program (e.g., no `g' prefix).  */
  30 #define PROGRAM_NAME "dirname"
  31
  32 #define AUTHORS "David MacKenzie", "Jim Meyering"
  33
  34 /* The name this program was run with. */
  35 char *program_name;
  36
  37 void
  38 usage (int status)
  39 {
  40   if (status != EXIT_SUCCESS)
  41     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  42              program_name);
  43   else
  44     {
  45       printf (_("\
  46 Usage: %s NAME\n\
  47   or:  %s OPTION\n\
  48 "),
  49               program_name, program_name);
  50       fputs (_("\
  51 Print NAME with its trailing /component removed; if NAME contains no /'s,\n\
  52 output `.' (meaning the current directory).\n\
  53 \n\
  54 "), stdout);
  55       fputs (HELP_OPTION_DESCRIPTION, stdout);
  56       fputs (VERSION_OPTION_DESCRIPTION, stdout);
  57       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
  58     }
  59   exit (status);
  60 }
  61
  62 int
  63 main (int argc, char **argv)
  64 {
  65   static char const dot = '.';
  66   char const *result;
  67   size_t len;
  68
  69   initialize_main (&argc, &argv);
  70   program_name = argv[0];
  71   setlocale (LC_ALL, "");
  72   bindtextdomain (PACKAGE, LOCALEDIR);
  73   textdomain (PACKAGE);
  74
  75   atexit (close_stdout);
  76
  77   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
  78                       usage, AUTHORS, (char const *) NULL);
  79   /* The above handles --help and --version.
  80      Since there is no other invocation of getopt, handle `--' here.  */
  81   if (argc > 1 && STREQ (argv[1], "--"))
  82     {
  83       --argc;
  84       ++argv;
  85     }
  86
  87   if (argc != 2)
  88     {
  89       error (0, 0, argc < 2 ? _("too few arguments")
  90              : _("too many arguments"));
  91       usage (EXIT_FAILURE);
  92     }
  93
  94   result = argv[1];
  95   len = dir_len (result);
  96
  97   if (! len)
  98     {
  99       result = &dot;
 100       len = 1;
 101     }
 102
 103   fwrite (result, 1, len, stdout);
 104   putchar ('\n');
 105
 106   exit (EXIT_SUCCESS);
 107 }