gecko-dev/config/fastcwd.pl

#!perl5
#
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
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#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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# License.
#
# The Original Code is mozilla.org code.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 1998
# the Initial Developer. All Rights Reserved.
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# Contributor(s):
#
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# either of the GNU General Public License Version 2 or later (the "GPL"),
# or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# ***** END LICENSE BLOCK *****

sub fastcwd {
	local($odev, $oino, $cdev, $cino, $tdev, $tino);
	local(@path, $path);
	local(*DIR);

	($cdev, $cino) = stat('.');
	for (;;) {
		($odev, $oino) = ($cdev, $cino);
		chdir('..');
		($cdev, $cino) = stat('.');
		last if $odev == $cdev && $oino == $cino;
		opendir(DIR, '.');
		for (;;) {
			$_ = readdir(DIR);
			next if $_ eq '.';
			next if $_ eq '..';

			last unless $_;
			($tdev, $tino) = lstat($_);
			last unless $tdev != $odev || $tino != $oino;
		}
		closedir(DIR);
		unshift(@path, $_);
	}
	chdir($path = '/' . join('/', @path));
	$path;
}
1;