Current File : //lib/x86_64-linux-gnu/perl-base/IO/Handle.pm
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 = "1.52";
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 @_;
}
}
1;
Mini Shell