src/dirname.c

   1 /* dirname -- strip filename suffix from pathname
   2    Copyright (C) 90, 91, 92, 93, 94, 1995 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
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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
  28 void strip_trailing_slashes ();
  29
  30 /* The name this program was run with. */
  31 char *program_name;
  32
  33 static void
  34 usage (int status)
  35 {
  36   if (status != 0)
  37     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  38              program_name);
  39   else
  40     {
  41       printf (_("\
  42 Usage: %s NAME\n\
  43   or:  %s OPTION\n\
  44 "),
  45               program_name, program_name);
  46       printf (_("\
  47 Print NAME with its trailing /component removed; if NAME contains no /'s,\n\
  48 output `.' (meaning the current directory).\n\
  49 \n\
  50   --help      display this help and exit\n\
  51   --version   output version information and exit\n\
  52 "));
  53     }
  54   exit (status);
  55 }
  56
  57 void
  58 main (int argc, char **argv)
  59 {
  60   register char *path;
  61   register char *slash;
  62
  63   program_name = argv[0];
  64   setlocale (LC_ALL, "");
  65   bindtextdomain (PACKAGE, LOCALEDIR);
  66   textdomain (PACKAGE);
  67
  68   parse_long_options (argc, argv, "dirname", PACKAGE_VERSION, usage);
  69
  70   if (argc != 2)
  71     {
  72       error (0, 0, _("too %s arguments"), argc < 2 ? _("few") : _("many"));
  73       usage (1);
  74     }
  75
  76   path = argv[1];
  77   strip_trailing_slashes (path);
  78
  79   slash = strrchr (path, '/');
  80   if (slash == NULL)
  81     path = (char *) ".";
  82   else
  83     {
  84       /* Remove any trailing slashes and final element. */
  85       while (slash > path && *slash == '/')
  86         --slash;
  87       slash[1] = 0;
  88     }
  89   puts (path);
  90
  91   exit (0);
  92 }