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|
#
package IO::File;
=head1 NAME
IO::File - supply object methods for filehandles
=head1 SYNOPSIS
use IO::File;
$fh = new IO::File;
if ($fh->open("< file")) {
print <$fh>;
$fh->close;
}
$fh = new IO::File "> file";
if (defined $fh) {
print $fh "bar\n";
$fh->close;
}
$fh = new IO::File "file", "r";
if (defined $fh) {
print <$fh>;
undef $fh; # automatically closes the file
}
$fh = new IO::File "file", O_WRONLY|O_APPEND;
if (defined $fh) {
print $fh "corge\n";
$pos = $fh->getpos;
$fh->setpos($pos);
undef $fh; # automatically closes the file
}
autoflush STDOUT 1;
=head1 DESCRIPTION
C<IO::File> inherits from C<IO::Handle> and C<IO::Seekable>. It extends
these classes with methods that are specific to file handles.
=head1 CONSTRUCTOR
=over 4
=item new ([ ARGS ] )
Creates a C<IO::File>. If it receives any parameters, they are passed to
the method C<open>; if the open fails, the object is destroyed. Otherwise,
it is returned to the caller.
=back
=head1 METHODS
=over 4
=item open( FILENAME [,MODE [,PERMS]] )
C<open> accepts one, two or three parameters. With one parameter,
it is just a front end for the built-in C<open> function. With two
parameters, the first parameter is a filename that may include
whitespace or other special characters, and the second parameter is
the open mode, optionally followed by a file permission value.
If C<IO::File::open> receives a Perl mode string ("E<gt>", "+E<lt>", etc.)
or a POSIX fopen() mode string ("w", "r+", etc.), it uses the basic
Perl C<open> operator.
If C<IO::File::open> is given a numeric mode, it passes that mode
and the optional permissions value to the Perl C<sysopen> operator.
For convenience, C<IO::File::import> tries to import the O_XXX
constants from the Fcntl module. If dynamic loading is not available,
this may fail, but the rest of IO::File will still work.
=back
=head1 SEE ALSO
L<perlfunc>,
L<perlop/"I/O Operators">,
L<IO::Handle>
L<IO::Seekable>
=head1 HISTORY
Derived from FileHandle.pm by Graham Barr E<lt>F<bodg@tiuk.ti.com>E<gt>.
=cut
require 5.000;
use strict;
use vars qw($VERSION @EXPORT @EXPORT_OK $AUTOLOAD @ISA);
use Carp;
use Symbol;
use SelectSaver;
use IO::Handle qw(_open_mode_string);
use IO::Seekable;
require Exporter;
require DynaLoader;
@ISA = qw(IO::Handle IO::Seekable Exporter DynaLoader);
$VERSION = "1.06";
@EXPORT = @IO::Seekable::EXPORT;
sub import {
my $pkg = shift;
my $callpkg = caller;
Exporter::export $pkg, $callpkg, @_;
#
# If the Fcntl extension is available,
# export its constants for sysopen().
#
eval {
require Fcntl;
Exporter::export 'Fcntl', $callpkg, '/^O_/';
};
}
################################################
## Constructor
##
sub new {
my $type = shift;
my $class = ref($type) || $type || "IO::File";
@_ >= 0 && @_ <= 3
or croak "usage: new $class [FILENAME [,MODE [,PERMS]]]";
my $fh = $class->SUPER::new();
if (@_) {
$fh->open(@_)
or return undef;
}
$fh;
}
################################################
## Open
##
sub open {
@_ >= 2 && @_ <= 4 or croak 'usage: $fh->open(FILENAME [,MODE [,PERMS]])';
my ($fh, $file) = @_;
if (@_ > 2) {
my ($mode, $perms) = @_[2, 3];
if ($mode =~ /^\d+$/) {
defined $perms or $perms = 0666;
return sysopen($fh, $file, $mode, $perms);
}
$file = "./" . $file unless $file =~ m#^/#;
$file = _open_mode_string($mode) . " $file\0";
}
open($fh, $file);
}
1;
|
