mirror of
https://git.savannah.gnu.org/git/parallel.git
synced 2024-11-22 14:07:55 +00:00
832 lines
21 KiB
Perl
832 lines
21 KiB
Perl
package Cwd;
|
|
|
|
=head1 NAME
|
|
|
|
Cwd - get pathname of current working directory
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
use Cwd;
|
|
my $dir = getcwd;
|
|
|
|
use Cwd 'abs_path';
|
|
my $abs_path = abs_path($file);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This module provides functions for determining the pathname of the
|
|
current working directory. It is recommended that getcwd (or another
|
|
*cwd() function) be used in I<all> code to ensure portability.
|
|
|
|
By default, it exports the functions cwd(), getcwd(), fastcwd(), and
|
|
fastgetcwd() (and, on Win32, getdcwd()) into the caller's namespace.
|
|
|
|
|
|
=head2 getcwd and friends
|
|
|
|
Each of these functions are called without arguments and return the
|
|
absolute path of the current working directory.
|
|
|
|
=over 4
|
|
|
|
=item getcwd
|
|
|
|
my $cwd = getcwd();
|
|
|
|
Returns the current working directory.
|
|
|
|
Exposes the POSIX function getcwd(3) or re-implements it if it's not
|
|
available.
|
|
|
|
=item cwd
|
|
|
|
my $cwd = cwd();
|
|
|
|
The cwd() is the most natural form for the current architecture. For
|
|
most systems it is identical to `pwd` (but without the trailing line
|
|
terminator).
|
|
|
|
=item fastcwd
|
|
|
|
my $cwd = fastcwd();
|
|
|
|
A more dangerous version of getcwd(), but potentially faster.
|
|
|
|
It might conceivably chdir() you out of a directory that it can't
|
|
chdir() you back into. If fastcwd encounters a problem it will return
|
|
undef but will probably leave you in a different directory. For a
|
|
measure of extra security, if everything appears to have worked, the
|
|
fastcwd() function will check that it leaves you in the same directory
|
|
that it started in. If it has changed it will C<die> with the message
|
|
"Unstable directory path, current directory changed
|
|
unexpectedly". That should never happen.
|
|
|
|
=item fastgetcwd
|
|
|
|
my $cwd = fastgetcwd();
|
|
|
|
The fastgetcwd() function is provided as a synonym for cwd().
|
|
|
|
=item getdcwd
|
|
|
|
my $cwd = getdcwd();
|
|
my $cwd = getdcwd('C:');
|
|
|
|
The getdcwd() function is also provided on Win32 to get the current working
|
|
directory on the specified drive, since Windows maintains a separate current
|
|
working directory for each drive. If no drive is specified then the current
|
|
drive is assumed.
|
|
|
|
This function simply calls the Microsoft C library _getdcwd() function.
|
|
|
|
=back
|
|
|
|
|
|
=head2 abs_path and friends
|
|
|
|
These functions are exported only on request. They each take a single
|
|
argument and return the absolute pathname for it. If no argument is
|
|
given they'll use the current working directory.
|
|
|
|
=over 4
|
|
|
|
=item abs_path
|
|
|
|
my $abs_path = abs_path($file);
|
|
|
|
Uses the same algorithm as getcwd(). Symbolic links and relative-path
|
|
components ("." and "..") are resolved to return the canonical
|
|
pathname, just like realpath(3).
|
|
|
|
=item realpath
|
|
|
|
my $abs_path = realpath($file);
|
|
|
|
A synonym for abs_path().
|
|
|
|
=item fast_abs_path
|
|
|
|
my $abs_path = fast_abs_path($file);
|
|
|
|
A more dangerous, but potentially faster version of abs_path.
|
|
|
|
=back
|
|
|
|
=head2 $ENV{PWD}
|
|
|
|
If you ask to override your chdir() built-in function,
|
|
|
|
use Cwd qw(chdir);
|
|
|
|
then your PWD environment variable will be kept up to date. Note that
|
|
it will only be kept up to date if all packages which use chdir import
|
|
it from Cwd.
|
|
|
|
|
|
=head1 NOTES
|
|
|
|
=over 4
|
|
|
|
=item *
|
|
|
|
Since the path separators are different on some operating systems ('/'
|
|
on Unix, ':' on MacPerl, etc...) we recommend you use the File::Spec
|
|
modules wherever portability is a concern.
|
|
|
|
=item *
|
|
|
|
Actually, on Mac OS, the C<getcwd()>, C<fastgetcwd()> and C<fastcwd()>
|
|
functions are all aliases for the C<cwd()> function, which, on Mac OS,
|
|
calls `pwd`. Likewise, the C<abs_path()> function is an alias for
|
|
C<fast_abs_path()>.
|
|
|
|
=back
|
|
|
|
=head1 AUTHOR
|
|
|
|
Originally by the perl5-porters.
|
|
|
|
Maintained by Ken Williams <KWILLIAMS@cpan.org>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright (c) 2004 by the Perl 5 Porters. All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the same terms as Perl itself.
|
|
|
|
Portions of the C code in this library are copyright (c) 1994 by the
|
|
Regents of the University of California. All rights reserved. The
|
|
license on this code is compatible with the licensing of the rest of
|
|
the distribution - please see the source code in F<Cwd.xs> for the
|
|
details.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<File::chdir>
|
|
|
|
=cut
|
|
|
|
use strict;
|
|
use Exporter;
|
|
use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION);
|
|
|
|
$VERSION = '3.36';
|
|
my $xs_version = $VERSION;
|
|
$VERSION = eval $VERSION;
|
|
|
|
@ISA = qw/ Exporter /;
|
|
@EXPORT = qw(cwd getcwd fastcwd fastgetcwd);
|
|
push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32';
|
|
@EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath);
|
|
|
|
# sys_cwd may keep the builtin command
|
|
|
|
# All the functionality of this module may provided by builtins,
|
|
# there is no sense to process the rest of the file.
|
|
# The best choice may be to have this in BEGIN, but how to return from BEGIN?
|
|
|
|
if ($^O eq 'os2') {
|
|
local $^W = 0;
|
|
|
|
*cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd;
|
|
*getcwd = \&cwd;
|
|
*fastgetcwd = \&cwd;
|
|
*fastcwd = \&cwd;
|
|
|
|
*fast_abs_path = \&sys_abspath if defined &sys_abspath;
|
|
*abs_path = \&fast_abs_path;
|
|
*realpath = \&fast_abs_path;
|
|
*fast_realpath = \&fast_abs_path;
|
|
|
|
return 1;
|
|
}
|
|
|
|
# Need to look up the feature settings on VMS. The preferred way is to use the
|
|
# VMS::Feature module, but that may not be available to dual life modules.
|
|
|
|
my $use_vms_feature;
|
|
BEGIN {
|
|
if ($^O eq 'VMS') {
|
|
if (eval { local $SIG{__DIE__}; require VMS::Feature; }) {
|
|
$use_vms_feature = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
# Need to look up the UNIX report mode. This may become a dynamic mode
|
|
# in the future.
|
|
sub _vms_unix_rpt {
|
|
my $unix_rpt;
|
|
if ($use_vms_feature) {
|
|
$unix_rpt = VMS::Feature::current("filename_unix_report");
|
|
} else {
|
|
my $env_unix_rpt = $ENV{'DECC$FILENAME_UNIX_REPORT'} || '';
|
|
$unix_rpt = $env_unix_rpt =~ /^[ET1]/i;
|
|
}
|
|
return $unix_rpt;
|
|
}
|
|
|
|
# Need to look up the EFS character set mode. This may become a dynamic
|
|
# mode in the future.
|
|
sub _vms_efs {
|
|
my $efs;
|
|
if ($use_vms_feature) {
|
|
$efs = VMS::Feature::current("efs_charset");
|
|
} else {
|
|
my $env_efs = $ENV{'DECC$EFS_CHARSET'} || '';
|
|
$efs = $env_efs =~ /^[ET1]/i;
|
|
}
|
|
return $efs;
|
|
}
|
|
|
|
|
|
# If loading the XS stuff doesn't work, we can fall back to pure perl
|
|
eval {
|
|
if ( $] >= 5.006 ) {
|
|
require XSLoader;
|
|
XSLoader::load( __PACKAGE__, $xs_version);
|
|
} else {
|
|
require DynaLoader;
|
|
push @ISA, 'DynaLoader';
|
|
__PACKAGE__->bootstrap( $xs_version );
|
|
}
|
|
};
|
|
|
|
# Must be after the DynaLoader stuff:
|
|
$VERSION = eval $VERSION;
|
|
|
|
# Big nasty table of function aliases
|
|
my %METHOD_MAP =
|
|
(
|
|
VMS =>
|
|
{
|
|
cwd => '_vms_cwd',
|
|
getcwd => '_vms_cwd',
|
|
fastcwd => '_vms_cwd',
|
|
fastgetcwd => '_vms_cwd',
|
|
abs_path => '_vms_abs_path',
|
|
fast_abs_path => '_vms_abs_path',
|
|
},
|
|
|
|
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_abs_path',
|
|
realpath => 'fast_abs_path',
|
|
},
|
|
|
|
dos =>
|
|
{
|
|
cwd => '_dos_cwd',
|
|
getcwd => '_dos_cwd',
|
|
fastgetcwd => '_dos_cwd',
|
|
fastcwd => '_dos_cwd',
|
|
abs_path => 'fast_abs_path',
|
|
},
|
|
|
|
# QNX4. QNX6 has a $os of 'nto'.
|
|
qnx =>
|
|
{
|
|
cwd => '_qnx_cwd',
|
|
getcwd => '_qnx_cwd',
|
|
fastgetcwd => '_qnx_cwd',
|
|
fastcwd => '_qnx_cwd',
|
|
abs_path => '_qnx_abs_path',
|
|
fast_abs_path => '_qnx_abs_path',
|
|
},
|
|
|
|
cygwin =>
|
|
{
|
|
getcwd => 'cwd',
|
|
fastgetcwd => 'cwd',
|
|
fastcwd => 'cwd',
|
|
abs_path => 'fast_abs_path',
|
|
realpath => 'fast_abs_path',
|
|
},
|
|
|
|
epoc =>
|
|
{
|
|
cwd => '_epoc_cwd',
|
|
getcwd => '_epoc_cwd',
|
|
fastgetcwd => '_epoc_cwd',
|
|
fastcwd => '_epoc_cwd',
|
|
abs_path => 'fast_abs_path',
|
|
},
|
|
|
|
MacOS =>
|
|
{
|
|
getcwd => 'cwd',
|
|
fastgetcwd => 'cwd',
|
|
fastcwd => 'cwd',
|
|
abs_path => 'fast_abs_path',
|
|
},
|
|
);
|
|
|
|
$METHOD_MAP{NT} = $METHOD_MAP{MSWin32};
|
|
|
|
|
|
# Find the pwd command in the expected locations. We assume these
|
|
# are safe. This prevents _backtick_pwd() consulting $ENV{PATH}
|
|
# so everything works under taint mode.
|
|
my $pwd_cmd;
|
|
foreach my $try ('/bin/pwd',
|
|
'/usr/bin/pwd',
|
|
'/QOpenSys/bin/pwd', # OS/400 PASE.
|
|
) {
|
|
|
|
if( -x $try ) {
|
|
$pwd_cmd = $try;
|
|
last;
|
|
}
|
|
}
|
|
my $found_pwd_cmd = defined($pwd_cmd);
|
|
unless ($pwd_cmd) {
|
|
# Isn't this wrong? _backtick_pwd() will fail if somenone has
|
|
# pwd in their path but it is not /bin/pwd or /usr/bin/pwd?
|
|
# See [perl #16774]. --jhi
|
|
$pwd_cmd = 'pwd';
|
|
}
|
|
|
|
# Lazy-load Carp
|
|
sub _carp { require Carp; Carp::carp(@_) }
|
|
sub _croak { require Carp; Carp::croak(@_) }
|
|
|
|
# The 'natural and safe form' for UNIX (pwd may be setuid root)
|
|
sub _backtick_pwd {
|
|
# Localize %ENV entries in a way that won't create new hash keys
|
|
my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV);
|
|
local @ENV{@localize};
|
|
|
|
my $cwd = `$pwd_cmd`;
|
|
# Belt-and-suspenders in case someone said "undef $/".
|
|
local $/ = "\n";
|
|
# `pwd` may fail e.g. if the disk is full
|
|
chomp($cwd) if defined $cwd;
|
|
$cwd;
|
|
}
|
|
|
|
# Since some ports may predefine cwd internally (e.g., NT)
|
|
# we take care not to override an existing definition for cwd().
|
|
|
|
unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) {
|
|
# The pwd command is not available in some chroot(2)'ed environments
|
|
my $sep = $Config::Config{path_sep} || ':';
|
|
my $os = $^O; # Protect $^O from tainting
|
|
|
|
|
|
# Try again to find a pwd, this time searching the whole PATH.
|
|
if (defined $ENV{PATH} and $os ne 'MSWin32') { # no pwd on Windows
|
|
my @candidates = split($sep, $ENV{PATH});
|
|
while (!$found_pwd_cmd and @candidates) {
|
|
my $candidate = shift @candidates;
|
|
$found_pwd_cmd = 1 if -x "$candidate/pwd";
|
|
}
|
|
}
|
|
|
|
# MacOS has some special magic to make `pwd` work.
|
|
if( $os eq 'MacOS' || $found_pwd_cmd )
|
|
{
|
|
*cwd = \&_backtick_pwd;
|
|
}
|
|
else {
|
|
*cwd = \&getcwd;
|
|
}
|
|
}
|
|
|
|
if ($^O eq 'cygwin') {
|
|
# We need to make sure cwd() is called with no args, because it's
|
|
# got an arg-less prototype and will die if args are present.
|
|
local $^W = 0;
|
|
my $orig_cwd = \&cwd;
|
|
*cwd = sub { &$orig_cwd() }
|
|
}
|
|
|
|
|
|
# set a reasonable (and very safe) default for fastgetcwd, in case it
|
|
# isn't redefined later (20001212 rspier)
|
|
*fastgetcwd = \&cwd;
|
|
|
|
# A non-XS version of getcwd() - also used to bootstrap the perl build
|
|
# process, when miniperl is running and no XS loading happens.
|
|
sub _perl_getcwd
|
|
{
|
|
abs_path('.');
|
|
}
|
|
|
|
# By John Bazik
|
|
#
|
|
# Usage: $cwd = &fastcwd;
|
|
#
|
|
# This is a faster version of getcwd. It's also more dangerous because
|
|
# you might chdir out of a directory that you can't chdir back into.
|
|
|
|
sub fastcwd_ {
|
|
my($odev, $oino, $cdev, $cino, $tdev, $tino);
|
|
my(@path, $path);
|
|
local(*DIR);
|
|
|
|
my($orig_cdev, $orig_cino) = stat('.');
|
|
($cdev, $cino) = ($orig_cdev, $orig_cino);
|
|
for (;;) {
|
|
my $direntry;
|
|
($odev, $oino) = ($cdev, $cino);
|
|
CORE::chdir('..') || return undef;
|
|
($cdev, $cino) = stat('.');
|
|
last if $odev == $cdev && $oino == $cino;
|
|
opendir(DIR, '.') || return undef;
|
|
for (;;) {
|
|
$direntry = readdir(DIR);
|
|
last unless defined $direntry;
|
|
next if $direntry eq '.';
|
|
next if $direntry eq '..';
|
|
|
|
($tdev, $tino) = lstat($direntry);
|
|
last unless $tdev != $odev || $tino != $oino;
|
|
}
|
|
closedir(DIR);
|
|
return undef unless defined $direntry; # should never happen
|
|
unshift(@path, $direntry);
|
|
}
|
|
$path = '/' . join('/', @path);
|
|
if ($^O eq 'apollo') { $path = "/".$path; }
|
|
# At this point $path may be tainted (if tainting) and chdir would fail.
|
|
# Untaint it then check that we landed where we started.
|
|
$path =~ /^(.*)\z/s # untaint
|
|
&& CORE::chdir($1) or return undef;
|
|
($cdev, $cino) = stat('.');
|
|
die "Unstable directory path, current directory changed unexpectedly"
|
|
if $cdev != $orig_cdev || $cino != $orig_cino;
|
|
$path;
|
|
}
|
|
if (not defined &fastcwd) { *fastcwd = \&fastcwd_ }
|
|
|
|
|
|
# Keeps track of current working directory in PWD environment var
|
|
# Usage:
|
|
# use Cwd 'chdir';
|
|
# chdir $newdir;
|
|
|
|
my $chdir_init = 0;
|
|
|
|
sub chdir_init {
|
|
if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') {
|
|
my($dd,$di) = stat('.');
|
|
my($pd,$pi) = stat($ENV{'PWD'});
|
|
if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) {
|
|
$ENV{'PWD'} = cwd();
|
|
}
|
|
}
|
|
else {
|
|
my $wd = cwd();
|
|
$wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32';
|
|
$ENV{'PWD'} = $wd;
|
|
}
|
|
# Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar)
|
|
if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) {
|
|
my($pd,$pi) = stat($2);
|
|
my($dd,$di) = stat($1);
|
|
if (defined $pd and defined $dd and $di == $pi and $dd == $pd) {
|
|
$ENV{'PWD'}="$2$3";
|
|
}
|
|
}
|
|
$chdir_init = 1;
|
|
}
|
|
|
|
sub chdir {
|
|
my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir)
|
|
$newdir =~ s|///*|/|g unless $^O eq 'MSWin32';
|
|
chdir_init() unless $chdir_init;
|
|
my $newpwd;
|
|
if ($^O eq 'MSWin32') {
|
|
# get the full path name *before* the chdir()
|
|
$newpwd = Win32::GetFullPathName($newdir);
|
|
}
|
|
|
|
return 0 unless CORE::chdir $newdir;
|
|
|
|
if ($^O eq 'VMS') {
|
|
return $ENV{'PWD'} = $ENV{'DEFAULT'}
|
|
}
|
|
elsif ($^O eq 'MacOS') {
|
|
return $ENV{'PWD'} = cwd();
|
|
}
|
|
elsif ($^O eq 'MSWin32') {
|
|
$ENV{'PWD'} = $newpwd;
|
|
return 1;
|
|
}
|
|
|
|
if (ref $newdir eq 'GLOB') { # in case a file/dir handle is passed in
|
|
$ENV{'PWD'} = cwd();
|
|
} elsif ($newdir =~ m#^/#s) {
|
|
$ENV{'PWD'} = $newdir;
|
|
} else {
|
|
my @curdir = split(m#/#,$ENV{'PWD'});
|
|
@curdir = ('') unless @curdir;
|
|
my $component;
|
|
foreach $component (split(m#/#, $newdir)) {
|
|
next if $component eq '.';
|
|
pop(@curdir),next if $component eq '..';
|
|
push(@curdir,$component);
|
|
}
|
|
$ENV{'PWD'} = join('/',@curdir) || '/';
|
|
}
|
|
1;
|
|
}
|
|
|
|
|
|
sub _perl_abs_path
|
|
{
|
|
my $start = @_ ? shift : '.';
|
|
my($dotdots, $cwd, @pst, @cst, $dir, @tst);
|
|
|
|
unless (@cst = stat( $start ))
|
|
{
|
|
_carp("stat($start): $!");
|
|
return '';
|
|
}
|
|
|
|
unless (-d _) {
|
|
# Make sure we can be invoked on plain files, not just directories.
|
|
# NOTE that this routine assumes that '/' is the only directory separator.
|
|
|
|
my ($dir, $file) = $start =~ m{^(.*)/(.+)$}
|
|
or return cwd() . '/' . $start;
|
|
|
|
# Can't use "-l _" here, because the previous stat was a stat(), not an lstat().
|
|
if (-l $start) {
|
|
my $link_target = readlink($start);
|
|
die "Can't resolve link $start: $!" unless defined $link_target;
|
|
|
|
require File::Spec;
|
|
$link_target = $dir . '/' . $link_target
|
|
unless File::Spec->file_name_is_absolute($link_target);
|
|
|
|
return abs_path($link_target);
|
|
}
|
|
|
|
return $dir ? abs_path($dir) . "/$file" : "/$file";
|
|
}
|
|
|
|
$cwd = '';
|
|
$dotdots = $start;
|
|
do
|
|
{
|
|
$dotdots .= '/..';
|
|
@pst = @cst;
|
|
local *PARENT;
|
|
unless (opendir(PARENT, $dotdots))
|
|
{
|
|
# probably a permissions issue. Try the native command.
|
|
return File::Spec->rel2abs( $start, _backtick_pwd() );
|
|
}
|
|
unless (@cst = stat($dotdots))
|
|
{
|
|
_carp("stat($dotdots): $!");
|
|
closedir(PARENT);
|
|
return '';
|
|
}
|
|
if ($pst[0] == $cst[0] && $pst[1] == $cst[1])
|
|
{
|
|
$dir = undef;
|
|
}
|
|
else
|
|
{
|
|
do
|
|
{
|
|
unless (defined ($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 = (defined $dir ? "$dir" : "" ) . "/$cwd" ;
|
|
closedir(PARENT);
|
|
} while (defined $dir);
|
|
chop($cwd) unless $cwd eq '/'; # drop the trailing /
|
|
$cwd;
|
|
}
|
|
|
|
|
|
my $Curdir;
|
|
sub fast_abs_path {
|
|
local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage
|
|
my $cwd = getcwd();
|
|
require File::Spec;
|
|
my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir);
|
|
|
|
# Detaint else we'll explode in taint mode. This is safe because
|
|
# we're not doing anything dangerous with it.
|
|
($path) = $path =~ /(.*)/;
|
|
($cwd) = $cwd =~ /(.*)/;
|
|
|
|
unless (-e $path) {
|
|
_croak("$path: No such file or directory");
|
|
}
|
|
|
|
unless (-d _) {
|
|
# Make sure we can be invoked on plain files, not just directories.
|
|
|
|
my ($vol, $dir, $file) = File::Spec->splitpath($path);
|
|
return File::Spec->catfile($cwd, $path) unless length $dir;
|
|
|
|
if (-l $path) {
|
|
my $link_target = readlink($path);
|
|
die "Can't resolve link $path: $!" unless defined $link_target;
|
|
|
|
$link_target = File::Spec->catpath($vol, $dir, $link_target)
|
|
unless File::Spec->file_name_is_absolute($link_target);
|
|
|
|
return fast_abs_path($link_target);
|
|
}
|
|
|
|
return $dir eq File::Spec->rootdir
|
|
? File::Spec->catpath($vol, $dir, $file)
|
|
: fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file;
|
|
}
|
|
|
|
if (!CORE::chdir($path)) {
|
|
_croak("Cannot chdir to $path: $!");
|
|
}
|
|
my $realpath = getcwd();
|
|
if (! ((-d $cwd) && (CORE::chdir($cwd)))) {
|
|
_croak("Cannot chdir back to $cwd: $!");
|
|
}
|
|
$realpath;
|
|
}
|
|
|
|
# added function alias to follow principle of least surprise
|
|
# based on previous aliasing. --tchrist 27-Jan-00
|
|
*fast_realpath = \&fast_abs_path;
|
|
|
|
|
|
# --- PORTING SECTION ---
|
|
|
|
# VMS: $ENV{'DEFAULT'} points to default directory at all times
|
|
# 06-Mar-1996 Charles Bailey bailey@newman.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
|
|
# 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 _vms_abs_path {
|
|
return $ENV{'DEFAULT'} unless @_;
|
|
my $path = shift;
|
|
|
|
my $efs = _vms_efs;
|
|
my $unix_rpt = _vms_unix_rpt;
|
|
|
|
if (defined &VMS::Filespec::vmsrealpath) {
|
|
my $path_unix = 0;
|
|
my $path_vms = 0;
|
|
|
|
$path_unix = 1 if ($path =~ m#(?<=\^)/#);
|
|
$path_unix = 1 if ($path =~ /^\.\.?$/);
|
|
$path_vms = 1 if ($path =~ m#[\[<\]]#);
|
|
$path_vms = 1 if ($path =~ /^--?$/);
|
|
|
|
my $unix_mode = $path_unix;
|
|
if ($efs) {
|
|
# In case of a tie, the Unix report mode decides.
|
|
if ($path_vms == $path_unix) {
|
|
$unix_mode = $unix_rpt;
|
|
} else {
|
|
$unix_mode = 0 if $path_vms;
|
|
}
|
|
}
|
|
|
|
if ($unix_mode) {
|
|
# Unix format
|
|
return VMS::Filespec::unixrealpath($path);
|
|
}
|
|
|
|
# VMS format
|
|
|
|
my $new_path = VMS::Filespec::vmsrealpath($path);
|
|
|
|
# Perl expects directories to be in directory format
|
|
$new_path = VMS::Filespec::pathify($new_path) if -d $path;
|
|
return $new_path;
|
|
}
|
|
|
|
# Fallback to older algorithm if correct ones are not
|
|
# available.
|
|
|
|
if (-l $path) {
|
|
my $link_target = readlink($path);
|
|
die "Can't resolve link $path: $!" unless defined $link_target;
|
|
|
|
return _vms_abs_path($link_target);
|
|
}
|
|
|
|
# may need to turn foo.dir into [.foo]
|
|
my $pathified = VMS::Filespec::pathify($path);
|
|
$path = $pathified if defined $pathified;
|
|
|
|
return VMS::Filespec::rmsexpand($path);
|
|
}
|
|
|
|
sub _os2_cwd {
|
|
$ENV{'PWD'} = `cmd /c cd`;
|
|
chomp $ENV{'PWD'};
|
|
$ENV{'PWD'} =~ s:\\:/:g ;
|
|
return $ENV{'PWD'};
|
|
}
|
|
|
|
sub _win32_cwd_simple {
|
|
$ENV{'PWD'} = `cd`;
|
|
chomp $ENV{'PWD'};
|
|
$ENV{'PWD'} =~ s:\\:/:g ;
|
|
return $ENV{'PWD'};
|
|
}
|
|
|
|
sub _win32_cwd {
|
|
if (eval 'defined &DynaLoader::boot_DynaLoader') {
|
|
$ENV{'PWD'} = Win32::GetCwd();
|
|
}
|
|
else { # miniperl
|
|
chomp($ENV{'PWD'} = `cd`);
|
|
}
|
|
$ENV{'PWD'} =~ s:\\:/:g ;
|
|
return $ENV{'PWD'};
|
|
}
|
|
|
|
*_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_win32_cwd_simple;
|
|
|
|
sub _dos_cwd {
|
|
if (!defined &Dos::GetCwd) {
|
|
$ENV{'PWD'} = `command /c cd`;
|
|
chomp $ENV{'PWD'};
|
|
$ENV{'PWD'} =~ s:\\:/:g ;
|
|
} else {
|
|
$ENV{'PWD'} = Dos::GetCwd();
|
|
}
|
|
return $ENV{'PWD'};
|
|
}
|
|
|
|
sub _qnx_cwd {
|
|
local $ENV{PATH} = '';
|
|
local $ENV{CDPATH} = '';
|
|
local $ENV{ENV} = '';
|
|
$ENV{'PWD'} = `/usr/bin/fullpath -t`;
|
|
chomp $ENV{'PWD'};
|
|
return $ENV{'PWD'};
|
|
}
|
|
|
|
sub _qnx_abs_path {
|
|
local $ENV{PATH} = '';
|
|
local $ENV{CDPATH} = '';
|
|
local $ENV{ENV} = '';
|
|
my $path = @_ ? shift : '.';
|
|
local *REALPATH;
|
|
|
|
defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or
|
|
die "Can't open /usr/bin/fullpath: $!";
|
|
my $realpath = <REALPATH>;
|
|
close REALPATH;
|
|
chomp $realpath;
|
|
return $realpath;
|
|
}
|
|
|
|
sub _epoc_cwd {
|
|
$ENV{'PWD'} = EPOC::getcwd();
|
|
return $ENV{'PWD'};
|
|
}
|
|
|
|
|
|
# Now that all the base-level functions are set up, alias the
|
|
# user-level functions to the right places
|
|
|
|
if (exists $METHOD_MAP{$^O}) {
|
|
my $map = $METHOD_MAP{$^O};
|
|
foreach my $name (keys %$map) {
|
|
local $^W = 0; # assignments trigger 'subroutine redefined' warning
|
|
no strict 'refs';
|
|
*{$name} = \&{$map->{$name}};
|
|
}
|
|
}
|
|
|
|
# In case the XS version doesn't load.
|
|
*abs_path = \&_perl_abs_path unless defined &abs_path;
|
|
*getcwd = \&_perl_getcwd unless defined &getcwd;
|
|
|
|
# added function alias for those of us more
|
|
# used to the libc function. --tchrist 27-Jan-00
|
|
*realpath = \&abs_path;
|
|
|
|
1;
|