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;# pwd.pl - keeps track of current working directory in PWD environment var |
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;# |
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# |
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# This library is no longer being maintained, and is included for backward |
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# compatibility with Perl 4 programs which may require it. |
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# |
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# In particular, this should not be used as an example of modern Perl |
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# programming techniques. |
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# |
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# Suggested alternative: Cwd |
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# |
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;# $RCSfile: pwd.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:24:11 $ |
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;# |
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;# $Log: pwd.pl,v $ |
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;# |
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;# Usage: |
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;# require "pwd.pl"; |
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;# &initpwd; |
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;# ... |
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;# &chdir($newdir); |
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package pwd; |
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sub main'initpwd { |
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if ($ENV{'PWD'}) { |
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local($dd,$di) = stat('.'); |
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local($pd,$pi) = stat($ENV{'PWD'}); |
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if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { |
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chop($ENV{'PWD'} = `pwd`); |
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} |
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} |
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else { |
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chop($ENV{'PWD'} = `pwd`); |
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} |
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if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) { |
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local($pd,$pi) = stat($2); |
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local($dd,$di) = stat($1); |
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if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { |
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$ENV{'PWD'}="$2$3"; |
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} |
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} |
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} |
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sub main'chdir { |
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local($newdir) = shift; |
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$newdir =~ s|/{2,}|/|g; |
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if (chdir $newdir) { |
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if ($newdir =~ m#^/#) { |
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$ENV{'PWD'} = $newdir; |
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} |
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else { |
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local(@curdir) = split(m#/#,$ENV{'PWD'}); |
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@curdir = '' unless @curdir; |
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foreach $component (split(m#/#, $newdir)) { |
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next if $component eq '.'; |
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pop(@curdir),next if $component eq '..'; |
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push(@curdir,$component); |
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} |
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$ENV{'PWD'} = join('/',@curdir) || '/'; |
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} |
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} |
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else { |
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0; |
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} |
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} |
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1; |
