package Cwd;
require 5.000;
require Exporter;
+use Carp;
=head1 NAME
If you ask to override your chdir() built-in function, then your PWD
environment variable will be kept up to date. (See
-L<perlsub/Overriding builtin functions>.) Note that it will only be
-kept up to date it all packages which use chdir import it from Cwd.
+L<perlsub/Overriding Builtin Functions>.) Note that it will only be
+kept up to date if all packages which use chdir import it from Cwd.
=cut
@ISA = qw(Exporter);
@EXPORT = qw(cwd getcwd fastcwd fastgetcwd);
-@EXPORT_OK = qw(chdir);
+@EXPORT_OK = qw(chdir abs_path fast_abspath);
# use strict;
-sub _backtick_pwd { # The 'natural and safe form' for UNIX (pwd may be setuid root)
+# The 'natural and safe form' for UNIX (pwd may be setuid root)
+sub _backtick_pwd {
my $cwd;
chop($cwd = `pwd`);
$cwd;
-}
+}
# Since some ports may predefine cwd internally (e.g., NT)
# we take care not to override an existing definition for cwd().
}
unless (@tst = lstat("$dotdots/$dir"))
{
- warn "lstat($dotdots/$dir): $!";
+ # warn "lstat($dotdots/$dir): $!";
# Just because you can't lstat this directory
# doesn't mean you'll never find the right one.
# closedir(PARENT);
my $chdir_init = 0;
sub chdir_init {
- if ($ENV{'PWD'} and $^O ne 'os2') {
+ if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'msdos') {
my($dd,$di) = stat('.');
my($pd,$pi) = stat($ENV{'PWD'});
if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) {
1;
}
+# Taken from Cwd.pm It is really getcwd with an optional
+# parameter instead of '.'
+#
+
+sub abs_path
+{
+ my $start = shift || '.';
+ my($dotdots, $cwd, @pst, @cst, $dir, @tst);
+
+ unless (@cst = stat( $start ))
+ {
+ carp "stat($start): $!";
+ return '';
+ }
+ $cwd = '';
+ $dotdots = $start;
+ do
+ {
+ $dotdots .= '/..';
+ @pst = @cst;
+ unless (opendir(PARENT, $dotdots))
+ {
+ carp "opendir($dotdots): $!";
+ return '';
+ }
+ unless (@cst = stat($dotdots))
+ {
+ carp "stat($dotdots): $!";
+ closedir(PARENT);
+ return '';
+ }
+ if ($pst[0] == $cst[0] && $pst[1] == $cst[1])
+ {
+ $dir = '';
+ }
+ else
+ {
+ do
+ {
+ unless (defined ($dir = readdir(PARENT)))
+ {
+ carp "readdir($dotdots): $!";
+ closedir(PARENT);
+ return '';
+ }
+ $tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir"))
+ }
+ while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] ||
+ $tst[1] != $pst[1]);
+ }
+ $cwd = "$dir/$cwd";
+ closedir(PARENT);
+ } while ($dir);
+ chop($cwd); # drop the trailing /
+ $cwd;
+}
+
+sub fast_abspath
+{
+ my $cwd = getcwd();
+ my $path = shift || '.';
+ chdir($path) || croak "Cannot chdir to $path:$!";
+ my $realpath = getcwd();
+ chdir($cwd) || croak "Cannot chdir back to $cwd:$!";
+ $realpath;
+}
+
# --- PORTING SECTION ---
# VMS: $ENV{'DEFAULT'} points to default directory at all times
# 06-Mar-1996 Charles Bailey bailey@genetics.upenn.edu
# Note: Use of Cwd::chdir() causes the logical name PWD to be defined
-# in the process logical name table as the default device and directory
-# seen by Perl. This may not be the same as the default device
+# in the process logical name table as the default device and directory
+# seen by Perl. This may not be the same as the default device
# and directory seen by DCL after Perl exits, since the effects
# the CRTL chdir() function persist only until Perl exits.
sub _vms_cwd {
return $ENV{'DEFAULT'}
}
+
sub _os2_cwd {
$ENV{'PWD'} = `cmd /c cd`;
chop $ENV{'PWD'};
return $ENV{'PWD'};
}
-my($oldw) = $^W;
-$^W = 0; # assignments trigger 'subroutine redefined' warning
-if ($^O eq 'VMS') {
+*_NT_cwd = \&_os2_cwd unless defined &_NT_cwd;
- *cwd = \&_vms_cwd;
- *getcwd = \&_vms_cwd;
- *fastcwd = \&_vms_cwd;
- *fastgetcwd = \&_vms_cwd;
-}
-elsif ($^O eq 'NT' or $^O eq 'MSWin32') {
-
- # We assume that &_NT_cwd is defined as an XSUB or in the core.
- *getcwd = \&_NT_cwd;
- *fastcwd = \&_NT_cwd;
- *fastgetcwd = \&_NT_cwd;
+sub _msdos_cwd {
+ $ENV{'PWD'} = `command /c cd`;
+ chop $ENV{'PWD'};
+ $ENV{'PWD'} =~ s:\\:/:g ;
+ return $ENV{'PWD'};
}
-elsif ($^O eq 'os2') {
- *cwd = \&_os2_cwd;
- *getcwd = \&_os2_cwd;
- *fastgetcwd = \&_os2_cwd;
- *fastcwd = \&_os2_cwd;
+{
+ local $^W = 0; # assignments trigger 'subroutine redefined' warning
+
+ if ($^O eq 'VMS') {
+ *cwd = \&_vms_cwd;
+ *getcwd = \&_vms_cwd;
+ *fastcwd = \&_vms_cwd;
+ *fastgetcwd = \&_vms_cwd;
+ *abs_path = \&fast_abspath;
+ }
+ elsif ($^O eq 'NT' or $^O eq 'MSWin32') {
+ # We assume that &_NT_cwd is defined as an XSUB or in the core.
+ *cwd = \&_NT_cwd;
+ *getcwd = \&_NT_cwd;
+ *fastcwd = \&_NT_cwd;
+ *fastgetcwd = \&_NT_cwd;
+ *abs_path = \&fast_abspath;
+ }
+ elsif ($^O eq 'os2') {
+ # sys_cwd may keep the builtin command
+ *cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd;
+ *getcwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd;
+ *fastgetcwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd;
+ *fastcwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd;
+ *abs_path = \&fast_abspath;
+ }
+ elsif ($^O eq 'msdos') {
+ *cwd = \&_msdos_cwd;
+ *getcwd = \&_msdos_cwd;
+ *fastgetcwd = \&_msdos_cwd;
+ *fastcwd = \&_msdos_cwd;
+ *abs_path = \&fast_abspath;
+ }
}
-$^W = $oldw;
# package main; eval join('',<DATA>) || die $@; # quick test
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