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 (status)
  36      int status;
  37 {
  38   if (status != 0)
  39     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  40              program_name);
  41   else
  42     {
  43       printf (_("\
  44 Usage: %s NAME\n\
  45   or:  %s OPTION\n\
  46 "),
  47               program_name, program_name);
  48       printf (_("\
  49 Print NAME with its trailing /component removed; if NAME contains no /'s,\n\
  50 output `.' (meaning the current directory).\n\
  51 \n\
  52   --help      display this help and exit\n\
  53   --version   output version information and exit\n\
  54 "));
  55     }
  56   exit (status);
  57 }
  58
  59 void
  60 main (argc, argv)
  61      int argc;
  62      char **argv;
  63 {
  64   register char *path;
  65   register char *slash;
  66
  67   program_name = argv[0];
  68
  69   parse_long_options (argc, argv, "dirname", version_string, usage);
  70
  71   if (argc != 2)
  72     {
  73       error (0, 0, _("too %s arguments"), argc < 2 ? _("few") : _("many"));
  74       usage (1);
  75     }
  76
  77   path = argv[1];
  78   strip_trailing_slashes (path);
  79
  80   slash = strrchr (path, '/');
  81   if (slash == NULL)
  82     path = (char *) ".";
  83   else
  84     {
  85       /* Remove any trailing slashes and final element. */
  86       while (slash > path && *slash == '/')
  87         --slash;
  88       slash[1] = 0;
  89     }
  90   puts (path);
  91
  92   exit (0);
  93 }