sub IRS_chunky {
    my($buf, $leftover, @lines);
    local $/ = \10240;
    open(FILE, "totalfoo");
    while( $buf = <FILE> ) {
       $buf = $leftover.$buf;
       @lines = split(/\n/, $buf);
       $leftover = ($buf !~ /\n$/) ? pop @lines : "";
       foreach (@lines) { }
    }
    
    close(FILE);
}