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