config/fastcwd.pl

   1 #!perl5
   2 #
   3 # ***** BEGIN LICENSE BLOCK *****
   4 # Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5 #
   6 # The contents of this file are subject to the Mozilla Public License Version
   7 # 1.1 (the "License"); you may not use this file except in compliance with
   8 # the License. You may obtain a copy of the License at
   9 # http://www.mozilla.org/MPL/
  10 #
  11 # Software distributed under the License is distributed on an "AS IS" basis,
  12 # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13 # for the specific language governing rights and limitations under the
  14 # License.
  15 #
  16 # The Original Code is mozilla.org code.
  17 #
  18 # The Initial Developer of the Original Code is
  19 # Netscape Communications Corporation.
  20 # Portions created by the Initial Developer are Copyright (C) 1998
  21 # the Initial Developer. All Rights Reserved.
  22 #
  23 # Contributor(s):
  24 #
  25 # Alternatively, the contents of this file may be used under the terms of
  26 # either of the GNU General Public License Version 2 or later (the "GPL"),
  27 # or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28 # in which case the provisions of the GPL or the LGPL are applicable instead
  29 # of those above. If you wish to allow use of your version of this file only
  30 # under the terms of either the GPL or the LGPL, and not to allow others to
  31 # use your version of this file under the terms of the MPL, indicate your
  32 # decision by deleting the provisions above and replace them with the notice
  33 # and other provisions required by the GPL or the LGPL. If you do not delete
  34 # the provisions above, a recipient may use your version of this file under
  35 # the terms of any one of the MPL, the GPL or the LGPL.
  36 #
  37 # ***** END LICENSE BLOCK *****
  38
  39 sub fastcwd {
  40         local($odev, $oino, $cdev, $cino, $tdev, $tino);
  41         local(@path, $path);
  42         local(*DIR);
  43
  44         ($cdev, $cino) = stat('.');
  45         for (;;) {
  46                 ($odev, $oino) = ($cdev, $cino);
  47                 chdir('..');
  48                 ($cdev, $cino) = stat('.');
  49                 last if $odev == $cdev && $oino == $cino;
  50                 opendir(DIR, '.');
  51                 for (;;) {
  52                         $_ = readdir(DIR);
  53                         next if $_ eq '.';
  54                         next if $_ eq '..';
  55
  56                         last unless $_;
  57                         ($tdev, $tino) = lstat($_);
  58                         last unless $tdev != $odev || $tino != $oino;
  59                 }
  60                 closedir(DIR);
  61                 unshift(@path, $_);
  62         }
  63         chdir($path = '/' . join('/', @path));
  64         $path;
  65 }
  66 1;