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