| 1 | # By John Bazik |
| 2 | # |
| 3 | # Usage: $cwd = &fastcwd; |
| 4 | # |
| 5 | # This is a faster version of getcwd. It's also more dangerous because |
| 6 | # you might chdir out of a directory that you can't chdir back into. |
| 7 | |
| 8 | sub fastcwd { |
| 9 | local($odev, $oino, $cdev, $cino, $tdev, $tino); |
| 10 | local(@path, $path); |
| 11 | local(*DIR); |
| 12 | |
| 13 | ($cdev, $cino) = stat('.'); |
| 14 | for (;;) { |
| 15 | ($odev, $oino) = ($cdev, $cino); |
| 16 | chdir('..'); |
| 17 | ($cdev, $cino) = stat('.'); |
| 18 | last if $odev == $cdev && $oino == $cino; |
| 19 | opendir(DIR, '.'); |
| 20 | for (;;) { |
| 21 | $_ = readdir(DIR); |
| 22 | next if $_ eq '.'; |
| 23 | next if $_ eq '..'; |
| 24 | |
| 25 | last unless $_; |
| 26 | ($tdev, $tino) = lstat($_); |
| 27 | last unless $tdev != $odev || $tino != $oino; |
| 28 | } |
| 29 | closedir(DIR); |
| 30 | unshift(@path, $_); |
| 31 | } |
| 32 | chdir($path = '/' . join('/', @path)); |
| 33 | $path; |
| 34 | } |
| 35 | 1; |