Yet another way would be to write a custom PerlIO layer (similar in spirit to :crlf, but for reading only), e.g. using PerlIO::via.

In its most simple form it could look something like: 

package PerlIO::via::AnyCRLF;    # save as PerlIO/via/AnyCRLF.pm

sub PUSHED {
    my ($class) = @_;
    my $dummy;
    return bless \$dummy, $class;
}

sub FILL {
    my ($self, $fh) = @_;
    my $len = read $fh, my $buf, 4096;
    if (defined $buf) {
        $buf =~ s/\r\n/\n/g;
        $buf =~ s/\r/\n/g;
    }
    return $len > 0 ? $buf : undef;
}
1;

[download]

Sample usage: 

#!/usr/bin/perl

use PerlIO::via::AnyCRLF;

open my $f, "<:via(AnyCRLF)", "le.txt" or die $!;

print while <$f>;

[download]

Handling the corner case (when \r\n gets split such that \r is in one buffer read, and \n in the next) is left as an exercise for the reader ;) — A quick fix could be to delegate the \r\n to \n translation to the regular :crlf layer (i.e. "<:crlf:via(AnyCRLF)"), and only do the \r to \n translation in this layer...

In reply to Re: line ending troubles by almut
in thread line ending troubles by Dirk80

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