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package Tie::StdHandle;
use strict;
use Tie::Handle;
use vars qw(@ISA $VERSION);
@ISA = 'Tie::Handle';
$VERSION = '4.4';
=head1 NAME
Tie::StdHandle - base class definitions for tied handles
=head1 SYNOPSIS
package NewHandle;
require Tie::Handle;
@ISA = qw(Tie::Handle);
sub READ { ... } # Provide a needed method
sub TIEHANDLE { ... } # Overrides inherited method
package main;
tie *FH, 'NewHandle';
=head1 DESCRIPTION
The B<Tie::StdHandle> package provide most methods for file handles described
in L<perltie> (the exceptions are C<UNTIE> and C<DESTROY>). It causes tied
file handles to behave exactly like standard file handles and allow for
selective overwriting of methods.
=cut
sub TIEHANDLE
{
my $class = shift;
my $fh = \do { local *HANDLE};
bless $fh,$class;
$fh->OPEN(@_) if (@_);
return $fh;
}
sub EOF { eof($_[0]) }
sub TELL { tell($_[0]) }
sub FILENO { fileno($_[0]) }
sub SEEK { seek($_[0],$_[1],$_[2]) }
sub CLOSE { close($_[0]) }
sub BINMODE { binmode($_[0]) }
sub OPEN
{
$_[0]->CLOSE if defined($_[0]->FILENO);
@_ == 2 ? open($_[0], $_[1]) : open($_[0], $_[1], $_[2]);
}
sub READ { &CORE::read(shift, \shift, @_) }
sub READLINE { my $fh = $_[0]; <$fh> }
sub GETC { getc($_[0]) }
sub WRITE
{
my $fh = $_[0];
local $\; # don't print any line terminator
print $fh substr($_[1], $_[3], $_[2]);
}
1;