| 1 | # By John Bazik |
| 2 | # |
| 3 | # This library is no longer being maintained, and is included for backward |
| 4 | # compatibility with Perl 4 programs which may require it. |
| 5 | # |
| 6 | # In particular, this should not be used as an example of modern Perl |
| 7 | # programming techniques. |
| 8 | # |
| 9 | # Suggested alternative: Cwd |
| 10 | # |
| 11 | # Usage: $cwd = &fastcwd; |
| 12 | # |
| 13 | # This is a faster version of getcwd. It's also more dangerous because |
| 14 | # you might chdir out of a directory that you can't chdir back into. |
| 15 | |
| 16 | sub fastcwd { |
| 17 | local($odev, $oino, $cdev, $cino, $tdev, $tino); |
| 18 | local(@path, $path); |
| 19 | local(*DIR); |
| 20 | |
| 21 | ($cdev, $cino) = stat('.'); |
| 22 | for (;;) { |
| 23 | ($odev, $oino) = ($cdev, $cino); |
| 24 | chdir('..'); |
| 25 | ($cdev, $cino) = stat('.'); |
| 26 | last if $odev == $cdev && $oino == $cino; |
| 27 | opendir(DIR, '.'); |
| 28 | for (;;) { |
| 29 | $_ = readdir(DIR); |
| 30 | next if $_ eq '.'; |
| 31 | next if $_ eq '..'; |
| 32 | |
| 33 | last unless $_; |
| 34 | ($tdev, $tino) = lstat($_); |
| 35 | last unless $tdev != $odev || $tino != $oino; |
| 36 | } |
| 37 | closedir(DIR); |
| 38 | unshift(@path, $_); |
| 39 | } |
| 40 | chdir($path = '/' . join('/', @path)); |
| 41 | $path; |
| 42 | } |
| 43 | 1; |