diff options
Diffstat (limited to 'lib/Cwd.pm')
| -rw-r--r-- | lib/Cwd.pm | 551 |
1 files changed, 0 insertions, 551 deletions
diff --git a/lib/Cwd.pm b/lib/Cwd.pm deleted file mode 100644 index d86527f9e0..0000000000 --- a/lib/Cwd.pm +++ /dev/null @@ -1,551 +0,0 @@ -package Cwd; -use 5.006; - -=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() 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. - -Re-implements the getcwd(3) (or getwd(3)) functions in Perl. - -=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). - -Unfortunately, cwd() tends to break if called under taint mode. - -=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(). - -=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. - -=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 $abs_path = abs_path($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 seperators 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 SEE ALSO - -L<File::chdir> - -=cut - -use strict; - -use Carp; - -our $VERSION = '2.06'; - -use base qw/ Exporter /; -our @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); -our @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); - -# sys_cwd may keep the builtin command - -# All the functionality of this module may provided by builtins, -# there is no sense to process the rest of the file. -# The best choice may be to have this in BEGIN, but how to return from BEGIN? - -if ($^O eq 'os2' && defined &sys_cwd && defined &sys_abspath) { - local $^W = 0; - *cwd = \&sys_cwd; - *getcwd = \&cwd; - *fastgetcwd = \&cwd; - *fastcwd = \&cwd; - *abs_path = \&sys_abspath; - *fast_abs_path = \&abs_path; - *realpath = \&abs_path; - *fast_realpath = \&abs_path; - return 1; -} - -eval { - require XSLoader; - undef *Cwd::fastcwd; # avoid redefinition warning - XSLoader::load('Cwd'); -}; - - -# 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 (qw(/bin/pwd /usr/bin/pwd)) { - if( -x $try ) { - $pwd_cmd = $try; - last; - } -} -$pwd_cmd ||= 'pwd'; - -# The 'natural and safe form' for UNIX (pwd may be setuid root) -sub _backtick_pwd { - 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; - $cwd; -} - -# Since some ports may predefine cwd internally (e.g., NT) -# we take care not to override an existing definition for cwd(). - -unless(defined &cwd) { - # The pwd command is not available in some chroot(2)'ed environments - if($^O eq 'MacOS' || grep { -x "$_/pwd" } split(':', $ENV{PATH})) { - *cwd = \&_backtick_pwd; - } - else { - *cwd = \&getcwd; - } -} - -# set a reasonable (and very safe) default for fastgetcwd, in case it -# isn't redefined later (20001212 rspier) -*fastgetcwd = \&cwd; - -# By Brandon S. Allbery -# -# Usage: $cwd = getcwd(); - -sub 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. - # To be more useful we untaint it then check that we landed where we started. - $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; - $path; -} - - -# 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'} = $newpwd; - return 1; - } - - if ($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; -} - - -# In case the XS version doesn't load. -*abs_path = \&_perl_abs_path unless defined &abs_path; -sub _perl_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]) - { - $dir = undef; - } - else - { - do - { - unless (defined ($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; -} - - -# 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(); - require File::Spec; - my $path = @_ ? shift : File::Spec->curdir; - CORE::chdir($path) || croak "Cannot chdir to $path:$!"; - my $realpath = getcwd(); - CORE::chdir($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 $path = VMS::Filespec::pathify($_[0]); - croak("Invalid path name $_[0]") unless defined $path; - return VMS::Filespec::rmsexpand($path); -} - -sub _os2_cwd { - $ENV{'PWD'} = `cmd /c cd`; - chop $ENV{'PWD'}; - $ENV{'PWD'} =~ s:\\:/:g ; - return $ENV{'PWD'}; -} - -sub _win32_cwd { - $ENV{'PWD'} = Win32::GetCwd(); - $ENV{'PWD'} =~ s:\\:/:g ; - return $ENV{'PWD'}; -} - -*_NT_cwd = \&_win32_cwd if (!defined &_NT_cwd && - defined &Win32::GetCwd); - -*_NT_cwd = \&_os2_cwd unless defined &_NT_cwd; - -sub _dos_cwd { - if (!defined &Dos::GetCwd) { - $ENV{'PWD'} = `command /c cd`; - chop $ENV{'PWD'}; - $ENV{'PWD'} =~ s:\\:/:g ; - } else { - $ENV{'PWD'} = Dos::GetCwd(); - } - return $ENV{'PWD'}; -} - -sub _qnx_cwd { - $ENV{'PWD'} = `/usr/bin/fullpath -t`; - chop $ENV{'PWD'}; - return $ENV{'PWD'}; -} - -sub _qnx_abs_path { - my $path = @_ ? shift : '.'; - my $realpath=`/usr/bin/fullpath -t $path`; - chop $realpath; - return $realpath; -} - -sub _epoc_cwd { - $ENV{'PWD'} = EPOC::getcwd(); - return $ENV{'PWD'}; -} - -{ - no warnings; # assignments trigger 'subroutine redefined' warning - - if ($^O eq 'VMS') { - *cwd = \&_vms_cwd; - *getcwd = \&_vms_cwd; - *fastcwd = \&_vms_cwd; - *fastgetcwd = \&_vms_cwd; - *abs_path = \&_vms_abs_path; - *fast_abs_path = \&_vms_abs_path; - } - elsif ($^O eq 'NT' or $^O eq 'MSWin32') { - # We assume that &_NT_cwd is defined as an XSUB or in the core. - *cwd = \&_NT_cwd; - *getcwd = \&_NT_cwd; - *fastcwd = \&_NT_cwd; - *fastgetcwd = \&_NT_cwd; - *abs_path = \&fast_abs_path; - *realpath = \&fast_abs_path; - } - elsif ($^O eq 'os2') { - # sys_cwd may keep the builtin command - *cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; - *getcwd = \&cwd; - *fastgetcwd = \&cwd; - *fastcwd = \&cwd; - *abs_path = \&fast_abs_path; - } - elsif ($^O eq 'dos') { - *cwd = \&_dos_cwd; - *getcwd = \&_dos_cwd; - *fastgetcwd = \&_dos_cwd; - *fastcwd = \&_dos_cwd; - *abs_path = \&fast_abs_path; - } - elsif ($^O =~ m/^(?:qnx|nto)$/ ) { - *cwd = \&_qnx_cwd; - *getcwd = \&_qnx_cwd; - *fastgetcwd = \&_qnx_cwd; - *fastcwd = \&_qnx_cwd; - *abs_path = \&_qnx_abs_path; - *fast_abs_path = \&_qnx_abs_path; - } - elsif ($^O eq 'cygwin') { - *getcwd = \&cwd; - *fastgetcwd = \&cwd; - *fastcwd = \&cwd; - *abs_path = \&fast_abs_path; - } - elsif ($^O eq 'epoc') { - *cwd = \&_epoc_cwd; - *getcwd = \&_epoc_cwd; - *fastgetcwd = \&_epoc_cwd; - *fastcwd = \&_epoc_cwd; - *abs_path = \&fast_abs_path; - } - elsif ($^O eq 'MacOS') { - *getcwd = \&cwd; - *fastgetcwd = \&cwd; - *fastcwd = \&cwd; - *abs_path = \&fast_abs_path; - } -} - - -1; |