However, this is only a good idea if your open statement opens only windows files.

Why do you say this? The :crlf layer doesn't hurt when opening files that have LF only. The following test passes on both Linux and Windows.

use warnings;
use strict;
use File::Temp qw/tempfile/;

my %tf = (
    crlf => do {
        my ($tfh, $tfn) = tempfile(UNLINK=>1);
        binmode $tfh;
        print $tfh "Foo\r\nBar\r\nQuz\r\n";
        close $tfh;
        $tfn },
    lf => do {
        my ($tfh, $tfn) = tempfile(UNLINK=>1);
        binmode $tfh;
        print $tfh "Foo\nBar\nQuz\n";
        close $tfh;
        $tfn },
    mix => do {
        my ($tfh, $tfn) = tempfile(UNLINK=>1);
        binmode $tfh;
        print $tfh "Foo\r\nBar\nQuz\r\n";
        close $tfh;
        $tfn },
    );

sub slurp {
    my ($fn, $mode) = @_;
    open my $fh, '<'.$mode, $fn or die "$fn: $!";
    local $/ = undef;
    return scalar <$fh>;
}

use Test::More tests=>10;

is $/, "\n";

is slurp($tf{crlf}, ':raw' ), "Foo\r\nBar\r\nQuz\r\n";
is slurp($tf{lf},   ':raw' ), "Foo\nBar\nQuz\n";
is slurp($tf{mix},  ':raw' ), "Foo\r\nBar\nQuz\r\n";

is slurp($tf{crlf}, ':crlf'), "Foo\nBar\nQuz\n";
is slurp($tf{lf},   ':crlf'), "Foo\nBar\nQuz\n";
is slurp($tf{mix},  ':crlf'), "Foo\nBar\nQuz\n";

is slurp($tf{crlf}, ''     ),
    $^O eq 'MSWin32' ? "Foo\nBar\nQuz\n" : "Foo\r\nBar\r\nQuz\r\n";
is slurp($tf{lf},   ''     ),
    $^O eq 'MSWin32' ? "Foo\nBar\nQuz\n" : "Foo\nBar\nQuz\n";
is slurp($tf{mix},  ''     ),
    $^O eq 'MSWin32' ? "Foo\nBar\nQuz\n" : "Foo\r\nBar\nQuz\r\n";

[download]

In reply to Re^3: Print Behavior with Carriage Return by haukex
in thread Print Behavior with Carriage Return by parapunker81

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