gecko-dev/config/fastcwd.pl

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1998-03-28 02:44:41 +00:00
#!perl5
#
# The contents of this file are subject to the Netscape 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 http://www.mozilla.org/NPL/
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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 for the specific language governing
# rights and limitations under the License.
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#
# The Original Code is mozilla.org code.
#
# The Initial Developer of the Original Code is Netscape
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# Communications Corporation. Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s):
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#
# By John Bazik
#
# Usage: $cwd = &fastcwd;
#
# This is a faster version of getcwd. It's also more dangerous because
# you might chdir out of a directory that you can't chdir back into.
#
sub fastcwd {
local($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;