chdir "/tmp";
print $ENV{'PWD'};
+ use Cwd 'abs_path'; # aka realpath()
+ print abs_path($ENV{'PWD'});
+
+ use Cwd 'fast_abs_path';
+ print fast_abs_path($ENV{'PWD'});
+
=head1 DESCRIPTION
The getcwd() function re-implements the getcwd(3) (or getwd(3)) functions
in Perl.
+The abs_path() function takes a single argument and returns the
+absolute pathname for that argument. It uses the same algorithm
+as getcwd(). (Actually, getcwd() is abs_path(".")) Symbolic links
+and relative-path components ("." and "..") are resolved to return
+the canonical pathname, just like realpath(3). Also callable as
+realpath().
+
The fastcwd() function looks the same as getcwd(), but runs faster.
It's also more dangerous because it might conceivably chdir() you out
of a directory that it can't chdir() you back into. If fastcwd
changed it will C<die> with the message "Unstable directory path,
current directory changed unexpectedly". That should never happen.
+The fast_abs_path() function looks the same as abs_path(), but runs faster.
+And like fastcwd() is more dangerous.
+
The cwd() function looks the same as getcwd and fastgetcwd but is
implemented using the most natural and safe form for the current
architecture. For most systems it is identical to `pwd` (but without
=cut
-## use strict;
+use strict;
use Carp;
-$VERSION = '2.01';
+our $VERSION = '2.03';
-require Exporter;
-@ISA = qw(Exporter);
-@EXPORT = qw(cwd getcwd fastcwd fastgetcwd);
-@EXPORT_OK = qw(chdir abs_path fast_abs_path);
+use base qw/ Exporter /;
+our @EXPORT = qw(cwd getcwd fastcwd fastgetcwd);
+our @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath);
# The 'natural and safe form' for UNIX (pwd may be setuid root)
sub _backtick_pwd {
- my $cwd;
- chop($cwd = `pwd`);
+ my $cwd = `pwd`;
+ # `pwd` may fail e.g. if the disk is full
+ chomp($cwd) if defined $cwd;
$cwd;
}
# 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.
-# List of metachars taken from do_exec() in doio.c
-my $quoted_shell_meta = quotemeta('$&*(){}[]";\\|?<>~`'."'\n");
-
sub fastcwd {
my($odev, $oino, $cdev, $cino, $tdev, $tino);
my(@path, $path);
for (;;) {
my $direntry;
($odev, $oino) = ($cdev, $cino);
- chdir('..') || return undef;
+ CORE::chdir('..') || return undef;
($cdev, $cino) = stat('.');
last if $odev == $cdev && $oino == $cino;
opendir(DIR, '.') || return undef;
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.
# To be more useful we untaint it then check that we landed where we started.
- $path = $1 if $path =~ /^(.*)$/; # untaint
- chdir($path) || return undef;
+ $path = $1 if $path =~ /^(.*)\z/s; # untaint
+ CORE::chdir($path) || return undef;
($cdev, $cino) = stat('.');
die "Unstable directory path, current directory changed unexpectedly"
if $cdev != $orig_cdev || $cino != $orig_cino;
my $chdir_init = 0;
sub chdir_init {
- if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos') {
+ if ($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) {
}
}
else {
- $ENV{'PWD'} = cwd();
+ my $wd = cwd();
+ $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32';
+ $ENV{'PWD'} = $wd;
}
# Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar)
- if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) {
+ 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) {
}
sub chdir {
- my $newdir = shift || ''; # allow for no arg (chdir to HOME dir)
- $newdir =~ s|///*|/|g;
+ my $newdir = @? ? shift : ''; # allow for no arg (chdir to HOME dir)
+ $newdir =~ s|///*|/|g unless $^O eq 'MSWin32';
chdir_init() unless $chdir_init;
return 0 unless CORE::chdir $newdir;
- if ($^O eq 'VMS') { return $ENV{'PWD'} = $ENV{'DEFAULT'} }
+ if ($^O eq 'VMS') {
+ return $ENV{'PWD'} = $ENV{'DEFAULT'}
+ }
+ elsif ($^O eq 'MSWin32') {
+ $ENV{'PWD'} = Win32::GetFullPathName($newdir);
+ return 1;
+ }
- if ($newdir =~ m#^/#) {
+ if ($newdir =~ m#^/#s) {
$ENV{'PWD'} = $newdir;
} else {
my @curdir = split(m#/#,$ENV{'PWD'});
$cwd;
}
+# added function alias for those of us more
+# used to the libc function. --tchrist 27-Jan-00
+*realpath = \&abs_path;
+
sub fast_abs_path {
my $cwd = getcwd();
- my $path = shift || '.';
- chdir($path) || croak "Cannot chdir to $path:$!";
+ my $path = @_ ? shift : '.';
+ CORE::chdir($path) || croak "Cannot chdir to $path:$!";
my $realpath = getcwd();
- chdir($cwd) || croak "Cannot chdir back to $cwd:$!";
+ 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@genetics.upenn.edu
+# 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
}
sub _qnx_abs_path {
- my $path = shift || '.';
+ my $path = @_ ? shift : '.';
my $realpath=`/usr/bin/fullpath -t $path`;
chop $realpath;
return $realpath;
}
{
- local $^W = 0; # assignments trigger 'subroutine redefined' warning
+ no warnings; # assignments trigger 'subroutine redefined' warning
if ($^O eq 'VMS') {
*cwd = \&_vms_cwd;
*abs_path = \&_qnx_abs_path;
*fast_abs_path = \&_qnx_abs_path;
}
+ elsif ($^O eq 'cygwin') {
+ *getcwd = \&cwd;
+ *fastgetcwd = \&cwd;
+ *fastcwd = \&cwd;
+ *abs_path = \&fast_abs_path;
+ }
}
# package main; eval join('',<DATA>) || die $@; # quick test
https://perl5.git.perl.org / perl5.git / blobdiff