#!/usr/bin/perl
use strict;
use warnings;
use Perl6::Slurp;

# write file with different line endings
# \r = 0x0D
# \n = 0x0A
my $win_line = "Windows\r\n";
my $unix_line = "Unix\n";
my $mac_line = "Mac\r";

open(my $fh, ">", "le_big.txt") or die "Failed file open: $!";
binmode($fh);

for (1 .. 100000)
{
	print $fh $win_line;
	print $fh $unix_line;
	print $fh $mac_line;
	print $fh $win_line;
	print $fh $mac_line;
	print $fh $win_line;
	print $fh $unix_line;
}

close($fh);

# read file with slurp

# PerlIO-layer 'crlf' is doing the conversion \r\n --> \n
# i.e. the input record separator only has to handle the line endings \n and \r
# Win32: crlf-layer is activated as default, so it is not necessary
#        to explicitly add this layer
# Unix and other OS: crlf-layer is NOT activated as default
#                    necessary to add this layer

for my $line (slurp("<:crlf", "le_big.txt", {irs => qr/\n|\r/, chomp => 1}) )
{
   print  $line . "\n";
}

# NOTE:
# It would also be possible to write a regexp which is working
# if the crlf-layer is active or not:
# irs => qr/\r\n|\n|\r/
# crlf-layer active: possible line endings are \n OR \r
# crlf-layer NOT active: possible line endings are \n\r OR \n OR \r