FM / IO

/usr/lib/x86_64-linux-gnu/perl-base/IO

Name	Size	Mode	Actions
Socket/	-	0755	rm
File.pm	1636	0644	edit dl rm
Handle.pm	7700	0644	edit dl rm
Pipe.pm	3414	0644	edit dl rm
Seekable.pm	642	0644	edit dl rm
Select.pm	4714	0644	edit dl rm
Socket.pm	9938	0644	edit dl rm

Edit: /usr/lib/x86_64-linux-gnu/perl-base/IO/Handle.pm (7700B)

package IO::Handle;

use 5.008_001;
use strict;
use Carp;
use Symbol;
use SelectSaver;
use IO ();	# Load the XS module

require Exporter;
our @ISA = qw(Exporter);

our $VERSION = "1.46";

our @EXPORT_OK = qw(
    autoflush
    output_field_separator
    output_record_separator
    input_record_separator
    input_line_number
    format_page_number
    format_lines_per_page
    format_lines_left
    format_name
    format_top_name
    format_line_break_characters
    format_formfeed
    format_write

print
    printf
    say
    getline
    getlines

printflush
    flush

SEEK_SET
    SEEK_CUR
    SEEK_END
    _IOFBF
    _IOLBF
    _IONBF
);

################################################
## Constructors, destructors.
##

sub new {
    my $class = ref($_[0]) || $_[0] || "IO::Handle";
    if (@_ != 1) {
	# Since perl will automatically require IO::File if needed, but
	# also initialises IO::File's @ISA as part of the core we must
	# ensure IO::File is loaded if IO::Handle is. This avoids effect-
	# ively "half-loading" IO::File.
	if ($] > 5.013 && $class eq 'IO::File' && !$INC{"IO/File.pm"}) {
	    require IO::File;
	    shift;
	    return IO::File::->new(@_);
	}
	croak "usage: $class->new()";
    }
    my $io = gensym;
    bless $io, $class;
}

sub new_from_fd {
    my $class = ref($_[0]) || $_[0] || "IO::Handle";
    @_ == 3 or croak "usage: $class->new_from_fd(FD, MODE)";
    my $io = gensym;
    shift;
    IO::Handle::fdopen($io, @_)
	or return undef;
    bless $io, $class;
}

#
# There is no need for DESTROY to do anything, because when the
# last reference to an IO object is gone, Perl automatically
# closes its associated files (if any).  However, to avoid any
# attempts to autoload DESTROY, we here define it to do nothing.
#
sub DESTROY {}

################################################
## Open and close.
##

sub _open_mode_string {
    my ($mode) = @_;
    $mode =~ /^\+?(<|>>?)$/
      or $mode =~ s/^r(\+?)$/$1</
      or $mode =~ s/^w(\+?)$/$1>/
      or $mode =~ s/^a(\+?)$/$1>>/
      or croak "IO::Handle: bad open mode: $mode";
    $mode;
}

sub fdopen {
    @_ == 3 or croak 'usage: $io->fdopen(FD, MODE)';
    my ($io, $fd, $mode) = @_;
    local(*GLOB);

if (ref($fd) && "$fd" =~ /GLOB\(/o) {
	# It's a glob reference; Alias it as we cannot get name of anon GLOBs
	my $n = qualify(*GLOB);
	*GLOB = *{*$fd};
	$fd =  $n;
    } elsif ($fd =~ m#^\d+$#) {
	# It's an FD number; prefix with "=".
	$fd = "=$fd";
    }

open($io, _open_mode_string($mode) . '&' . $fd)
	? $io : undef;
}

sub close {
    @_ == 1 or croak 'usage: $io->close()';
    my($io) = @_;

close($io);
}

################################################
## Normal I/O functions.
##

# flock
# select

sub opened {
    @_ == 1 or croak 'usage: $io->opened()';
    defined fileno($_[0]);
}

sub fileno {
    @_ == 1 or croak 'usage: $io->fileno()';
    fileno($_[0]);
}

sub getc {
    @_ == 1 or croak 'usage: $io->getc()';
    getc($_[0]);
}

sub eof {
    @_ == 1 or croak 'usage: $io->eof()';
    eof($_[0]);
}

sub print {
    @_ or croak 'usage: $io->print(ARGS)';
    my $this = shift;
    print $this @_;
}

sub printf {
    @_ >= 2 or croak 'usage: $io->printf(FMT,[ARGS])';
    my $this = shift;
    printf $this @_;
}

sub say {
    @_ or croak 'usage: $io->say(ARGS)';
    my $this = shift;
    local $\ = "\n";
    print $this @_;
}

sub truncate {
    @_ == 2 or croak 'usage: $io->truncate(LEN)';
    truncate($_[0], $_[1]);
}

sub read {
    @_ == 3 || @_ == 4 or croak 'usage: $io->read(BUF, LEN [, OFFSET])';
    read($_[0], $_[1], $_[2], $_[3] || 0);
}

sub sysread {
    @_ == 3 || @_ == 4 or croak 'usage: $io->sysread(BUF, LEN [, OFFSET])';
    sysread($_[0], $_[1], $_[2], $_[3] || 0);
}

sub write {
    @_ >= 2 && @_ <= 4 or croak 'usage: $io->write(BUF [, LEN [, OFFSET]])';
    local($\) = "";
    $_[2] = length($_[1]) unless defined $_[2];
    print { $_[0] } substr($_[1], $_[3] || 0, $_[2]);
}

sub syswrite {
    @_ >= 2 && @_ <= 4 or croak 'usage: $io->syswrite(BUF [, LEN [, OFFSET]])';
    if (defined($_[2])) {
	syswrite($_[0], $_[1], $_[2], $_[3] || 0);
    } else {
	syswrite($_[0], $_[1]);
    }
}

sub stat {
    @_ == 1 or croak 'usage: $io->stat()';
    stat($_[0]);
}

################################################
## State modification functions.
##

sub autoflush {
    my $old = SelectSaver->new(qualify($_[0], caller));
    my $prev = $|;
    $| = @_ > 1 ? $_[1] : 1;
    $prev;
}

sub output_field_separator {
    carp "output_field_separator is not supported on a per-handle basis"
	if ref($_[0]);
    my $prev = $,;
    $, = $_[1] if @_ > 1;
    $prev;
}

sub output_record_separator {
    carp "output_record_separator is not supported on a per-handle basis"
	if ref($_[0]);
    my $prev = $\;
    $\ = $_[1] if @_ > 1;
    $prev;
}

sub input_record_separator {
    carp "input_record_separator is not supported on a per-handle basis"
	if ref($_[0]);
    my $prev = $/;
    $/ = $_[1] if @_ > 1;
    $prev;
}

sub input_line_number {
    local $.;
    () = tell qualify($_[0], caller) if ref($_[0]);
    my $prev = $.;
    $. = $_[1] if @_ > 1;
    $prev;
}

sub format_page_number {
    my $old;
    $old = SelectSaver->new(qualify($_[0], caller)) if ref($_[0]);
    my $prev = $%;
    $% = $_[1] if @_ > 1;
    $prev;
}

sub format_lines_per_page {
    my $old;
    $old = SelectSaver->new(qualify($_[0], caller)) if ref($_[0]);
    my $prev = $=;
    $= = $_[1] if @_ > 1;
    $prev;
}

sub format_lines_left {
    my $old;
    $old = SelectSaver->new(qualify($_[0], caller)) if ref($_[0]);
    my $prev = $-;
    $- = $_[1] if @_ > 1;
    $prev;
}

sub format_name {
    my $old;
    $old = SelectSaver->new(qualify($_[0], caller)) if ref($_[0]);
    my $prev = $~;
    $~ = qualify($_[1], caller) if @_ > 1;
    $prev;
}

sub format_top_name {
    my $old;
    $old = SelectSaver->new(qualify($_[0], caller)) if ref($_[0]);
    my $prev = $^;
    $^ = qualify($_[1], caller) if @_ > 1;
    $prev;
}

sub format_line_break_characters {
    carp "format_line_break_characters is not supported on a per-handle basis"
	if ref($_[0]);
    my $prev = $:;
    $: = $_[1] if @_ > 1;
    $prev;
}

sub format_formfeed {
    carp "format_formfeed is not supported on a per-handle basis"
	if ref($_[0]);
    my $prev = $^L;
    $^L = $_[1] if @_ > 1;
    $prev;
}

sub formline {
    my $io = shift;
    my $picture = shift;
    local($^A) = $^A;
    local($\) = "";
    formline($picture, @_);
    print $io $^A;
}

sub format_write {
    @_ < 3 || croak 'usage: $io->write( [FORMAT_NAME] )';
    if (@_ == 2) {
	my ($io, $fmt) = @_;
	my $oldfmt = $io->format_name(qualify($fmt,caller));
	CORE::write($io);
	$io->format_name($oldfmt);
    } else {
	CORE::write($_[0]);
    }
}

sub fcntl {
    @_ == 3 || croak 'usage: $io->fcntl( OP, VALUE );';
    my ($io, $op) = @_;
    return fcntl($io, $op, $_[2]);
}

sub ioctl {
    @_ == 3 || croak 'usage: $io->ioctl( OP, VALUE );';
    my ($io, $op) = @_;
    return ioctl($io, $op, $_[2]);
}

# this sub is for compatibility with older releases of IO that used
# a sub called constant to determine if a constant existed -- GMB
#
# The SEEK_* and _IO?BF constants were the only constants at that time
# any new code should just check defined(&CONSTANT_NAME)

sub constant {
    no strict 'refs';
    my $name = shift;
    (($name =~ /^(SEEK_(SET|CUR|END)|_IO[FLN]BF)$/) && defined &{$name})
	? &{$name}() : undef;
}

# so that flush.pl can be deprecated

sub printflush {
    my $io = shift;
    my $old;
    $old = SelectSaver->new(qualify($io, caller)) if ref($io);
    local $| = 1;
    if(ref($io)) {
        print $io @_;
    }
    else {
	print @_;
    }
}

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