chdir "/tmp";
print $ENV{'PWD'};
- use Cwd 'abs_path';
+ use Cwd 'abs_path'; # aka realpath()
print abs_path($ENV{'PWD'});
use Cwd 'fast_abs_path';
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("."))
+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
use Carp;
-$VERSION = '2.01';
+$VERSION = '2.03';
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(cwd getcwd fastcwd fastgetcwd);
-@EXPORT_OK = qw(chdir abs_path fast_abs_path);
+@EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath);
# The 'natural and safe form' for UNIX (pwd may be setuid root)
# 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, $path);
if ($^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
+ $path = $1 if $path =~ /^(.*)\z/s; # untaint
CORE::chdir($path) || return undef;
($cdev, $cino) = stat('.');
die "Unstable directory path, current directory changed unexpectedly"
$ENV{'PWD'} = cwd();
}
# Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar)
- if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) {
+ if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) {
my($pd,$pi) = stat($2);
my($dd,$di) = stat($1);
if (defined $pd and defined $dd and $di == $pi and $dd == $pd) {
return 0 unless CORE::chdir $newdir;
if ($^O eq 'VMS') { return $ENV{'PWD'} = $ENV{'DEFAULT'} }
- if ($newdir =~ m#^/#) {
+ if ($newdir =~ m#^/#s) {
$ENV{'PWD'} = $newdir;
} else {
my @curdir = split(m#/#,$ENV{'PWD'});
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);
+# By Jeff "japhy" Pinyan (07/23/2000)
+# usage: abs_path(PATHNAME)
+# see the docs
+
+sub abs_path {
+ my $base = @_ ? $_[0] : ".";
+ my $path = "";
+ my $file;
+
+ do {
+ my @devino = (stat($base))[0,1] or
+ carp("stat($base): $!"), return;
- unless (@cst = stat( $start ))
- {
- carp "stat($start): $!";
- return '';
+ $base .= "/..";
+
+ opendir PREV, $base or carp("opendir($base): $!"), return;
+ while (defined($file = readdir PREV)) {
+ next if $file eq "." or $file eq "..";
+ my @entry = (lstat("$base/$file"))[0,1] or
+ carp("lstat($base/$file): $!"), return;
+ last if $devino[0] == $entry[0] and $devino[1] == $entry[1];
}
- $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])
- {
- $dir = undef;
- }
- else
- {
- do
- {
- unless (defined ($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;
+ closedir PREV;
+
+ $path = (defined $file and $file) . "/$path";
+ } while defined $file;
+
+ length($path) > 1 and chop $path;
+ return $path;
}
+
+# 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 || '.';
$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 ---
}
{
- 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
projects / p5sagit/p5-mst-13.2.git / blobdiff