Commit | Line | Data |
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99b89507 LW |
1 | # By John Bazik |
2 | # | |
a6d71656 GS |
3 | # This library is no longer being maintained, and is included for backward |
4 | # compatibility with Perl 4 programs which may require it. | |
2f8d2bfa S |
5 | # This legacy library is deprecated and will be removed in a future |
6 | # release of perl. | |
a6d71656 GS |
7 | # |
8 | # In particular, this should not be used as an example of modern Perl | |
9 | # programming techniques. | |
10 | # | |
11 | # Suggested alternative: Cwd | |
2f8d2bfa | 12 | |
99b89507 LW |
13 | # Usage: $cwd = &fastcwd; |
14 | # | |
15 | # This is a faster version of getcwd. It's also more dangerous because | |
16 | # you might chdir out of a directory that you can't chdir back into. | |
17 | ||
18 | sub fastcwd { | |
19 | local($odev, $oino, $cdev, $cino, $tdev, $tino); | |
20 | local(@path, $path); | |
21 | local(*DIR); | |
22 | ||
23 | ($cdev, $cino) = stat('.'); | |
24 | for (;;) { | |
25 | ($odev, $oino) = ($cdev, $cino); | |
26 | chdir('..'); | |
27 | ($cdev, $cino) = stat('.'); | |
28 | last if $odev == $cdev && $oino == $cino; | |
29 | opendir(DIR, '.'); | |
30 | for (;;) { | |
31 | $_ = readdir(DIR); | |
32 | next if $_ eq '.'; | |
33 | next if $_ eq '..'; | |
34 | ||
35 | last unless $_; | |
36 | ($tdev, $tino) = lstat($_); | |
37 | last unless $tdev != $odev || $tino != $oino; | |
38 | } | |
39 | closedir(DIR); | |
40 | unshift(@path, $_); | |
41 | } | |
42 | chdir($path = '/' . join('/', @path)); | |
43 | $path; | |
44 | } | |
45 | 1; |