6 @EXPORT = qw(getcwd fastcwd);
7 @EXPORT_OK = qw(chdir);
10 # By Brandon S. Allbery
12 # Usage: $cwd = getcwd();
16 my($dotdots, $cwd, @pst, @cst, $dir, @tst);
18 unless (@cst = stat('.'))
26 $dotdots .= '/' if $dotdots;
29 unless (opendir(PARENT, $dotdots))
31 warn "opendir($dotdots): $!";
34 unless (@cst = stat($dotdots))
36 warn "stat($dotdots): $!";
40 if ($pst[0] == $cst[0] && $pst[1] == $cst[1])
48 unless ($dir = readdir(PARENT))
50 warn "readdir($dotdots): $!";
54 unless (@tst = lstat("$dotdots/$dir"))
56 warn "lstat($dotdots/$dir): $!";
61 while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] ||
75 # Usage: $cwd = &fastcwd;
77 # This is a faster version of getcwd. It's also more dangerous because
78 # you might chdir out of a directory that you can't chdir back into.
81 my($odev, $oino, $cdev, $cino, $tdev, $tino);
85 ($cdev, $cino) = stat('.');
87 ($odev, $oino) = ($cdev, $cino);
89 ($cdev, $cino) = stat('.');
90 last if $odev == $cdev && $oino == $cino;
98 ($tdev, $tino) = lstat($_);
99 last unless $tdev != $odev || $tino != $oino;
104 chdir($path = '/' . join('/', @path));
109 # keeps track of current working directory in PWD environment var
111 # $RCSfile: pwd.pl,v $$Revision: 4.1 $$Date: 92/08/07 18:24:11 $
123 my($dd,$di) = stat('.');
124 my($pd,$pi) = stat($ENV{'PWD'});
125 if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) {
126 chop($ENV{'PWD'} = `pwd`);
130 chop($ENV{'PWD'} = `pwd`);
132 if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) {
133 my($pd,$pi) = stat($2);
134 my($dd,$di) = stat($1);
135 if (defined $pd and defined $dd and $di == $pi and $dd == $pd) {
144 chdir_init() unless $chdir_init;
145 return 0 unless (CORE::chdir $newdir);
146 if ($newdir =~ m#^/#) {
147 $ENV{'PWD'} = $newdir;
149 my(@curdir) = split(m#/#,$ENV{'PWD'});
150 @curdir = '' unless @curdir;
151 foreach $component (split(m#/#, $newdir)) {
152 next if $component eq '.';
153 pop(@curdir),next if $component eq '..';
154 push(@curdir,$component);
156 $ENV{'PWD'} = join('/',@curdir) || '/';