Linux lhjmq-records 5.15.0-118-generic #128-Ubuntu SMP Fri Jul 5 09:28:59 UTC 2024 x86_64
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package DirHandle;
our $VERSION = '1.05';
=head1 NAME
DirHandle - (obsolete) supply object methods for directory handles
=head1 SYNOPSIS
# recommended approach since Perl 5.6: do not use DirHandle
if (opendir my $d, '.') {
while (readdir $d) { something($_); }
rewind $d;
while (readdir $d) { something_else($_); }
}
# how you would use this module if you were going to
use DirHandle;
if (my $d = DirHandle->new(".")) {
while (defined($_ = $d->read)) { something($_); }
$d->rewind;
while (defined($_ = $d->read)) { something_else($_); }
}
=head1 DESCRIPTION
B<There is no reason to use this module nowadays.>
The C<DirHandle> method provide an alternative interface to the
opendir(), closedir(), readdir(), and rewinddir() functions.
Up to Perl 5.5, opendir() could not autovivify a directory handle from
C<undef>, so using a lexical handle required using a function from L<Symbol>
to create an anonymous glob, which took a separate step.
C<DirHandle> encapsulates this, which allowed cleaner code than opendir().
Since Perl 5.6, opendir() alone has been all you need for lexical handles.
=cut
require 5.000;
use Carp;
use Symbol;
sub new {
@_ >= 1 && @_ <= 2 or croak 'usage: DirHandle->new( [DIRNAME] )';
my $class = shift;
my $dh = gensym;
if (@_) {
DirHandle::open($dh, $_[0])
or return undef;
}
bless $dh, $class;
}
sub DESTROY {
my ($dh) = @_;
# Don't warn about already being closed as it may have been closed
# correctly, or maybe never opened at all.
local($., $@, $!, $^E, $?);
no warnings 'io';
closedir($dh);
}
sub open {
@_ == 2 or croak 'usage: $dh->open(DIRNAME)';
my ($dh, $dirname) = @_;
opendir($dh, $dirname);
}
sub close {
@_ == 1 or croak 'usage: $dh->close()';
my ($dh) = @_;
closedir($dh);
}
sub read {
@_ == 1 or croak 'usage: $dh->read()';
my ($dh) = @_;
readdir($dh);
}
sub rewind {
@_ == 1 or croak 'usage: $dh->rewind()';
my ($dh) = @_;
rewinddir($dh);
}
1;
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