36 lines
754 B
Perl
36 lines
754 B
Perl
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# By John Bazik
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#
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# Usage: $cwd = &fastcwd;
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#
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# This is a faster version of getcwd. It's also more dangerous because
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# you might chdir out of a directory that you can't chdir back into.
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sub fastcwd {
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local($odev, $oino, $cdev, $cino, $tdev, $tino);
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local(@path, $path);
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local(*DIR);
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($cdev, $cino) = stat('.');
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for (;;) {
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($odev, $oino) = ($cdev, $cino);
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chdir('..');
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($cdev, $cino) = stat('.');
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last if $odev == $cdev && $oino == $cino;
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opendir(DIR, '.');
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for (;;) {
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$_ = readdir(DIR);
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next if $_ eq '.';
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next if $_ eq '..';
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last unless $_;
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($tdev, $tino) = lstat($_);
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last unless $tdev != $odev || $tino != $oino;
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}
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closedir(DIR);
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unshift(@path, $_);
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}
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chdir($path = '/' . join('/', @path));
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$path;
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}
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1;
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