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;# pwd.pl - keeps track of current working directory in PWD environment var
;#
;# $Header: pwd.pl,v 4.0 91/03/20 01:26:03 lwall Locked $
;#
;# $Log: pwd.pl,v $
;# Revision 4.0 91/03/20 01:26:03 lwall
;# 4.0 baseline.
;#
;# Revision 3.0.1.2 91/01/11 18:09:24 lwall
;# patch42: some .pl files were missing their trailing 1;
;#
;# Revision 3.0.1.1 90/08/09 04:01:24 lwall
;# patch19: Initial revision
;#
;#
;# 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'});
return if $di == $pi && $dd == $pd;
}
chop($ENV{'PWD'} = `pwd`);
}
sub main'chdir {
local($newdir) = shift;
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;
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