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00bf170e LW |
1 | ;# pwd.pl - keeps track of current working directory in PWD environment var |
2 | ;# | |
a6d71656 GS |
3 | # |
4 | # This library is no longer being maintained, and is included for backward | |
5 | # compatibility with Perl 4 programs which may require it. | |
6 | # | |
7 | # In particular, this should not be used as an example of modern Perl | |
8 | # programming techniques. | |
9 | # | |
10 | # Suggested alternative: Cwd | |
11 | # | |
79072805 | 12 | ;# $RCSfile: pwd.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:24:11 $ |
00bf170e LW |
13 | ;# |
14 | ;# $Log: pwd.pl,v $ | |
00bf170e LW |
15 | ;# |
16 | ;# Usage: | |
17 | ;# require "pwd.pl"; | |
18 | ;# &initpwd; | |
19 | ;# ... | |
20 | ;# &chdir($newdir); | |
21 | ||
22 | package pwd; | |
23 | ||
24 | sub main'initpwd { | |
25 | if ($ENV{'PWD'}) { | |
26 | local($dd,$di) = stat('.'); | |
27 | local($pd,$pi) = stat($ENV{'PWD'}); | |
d5c3ff09 | 28 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { |
32c2e4fb LW |
29 | chop($ENV{'PWD'} = `pwd`); |
30 | } | |
31 | } | |
32 | else { | |
33 | chop($ENV{'PWD'} = `pwd`); | |
34 | } | |
35 | if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) { | |
36 | local($pd,$pi) = stat($2); | |
37 | local($dd,$di) = stat($1); | |
d5c3ff09 | 38 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { |
32c2e4fb LW |
39 | $ENV{'PWD'}="$2$3"; |
40 | } | |
00bf170e | 41 | } |
00bf170e LW |
42 | } |
43 | ||
44 | sub main'chdir { | |
45 | local($newdir) = shift; | |
748a9306 | 46 | $newdir =~ s|/{2,}|/|g; |
00bf170e LW |
47 | if (chdir $newdir) { |
48 | if ($newdir =~ m#^/#) { | |
49 | $ENV{'PWD'} = $newdir; | |
50 | } | |
51 | else { | |
52 | local(@curdir) = split(m#/#,$ENV{'PWD'}); | |
53 | @curdir = '' unless @curdir; | |
54 | foreach $component (split(m#/#, $newdir)) { | |
55 | next if $component eq '.'; | |
56 | pop(@curdir),next if $component eq '..'; | |
57 | push(@curdir,$component); | |
58 | } | |
59 | $ENV{'PWD'} = join('/',@curdir) || '/'; | |
60 | } | |
61 | } | |
62 | else { | |
63 | 0; | |
64 | } | |
65 | } | |
66 | ||
27e2fb84 | 67 | 1; |