my $data = read_port();

while( 0 == match_data($data) )
{
    do_if_no_match();
    $data = read_port();
}

process_match($data);
do_if_no_match();

# End.

##</code><code>##

my $loop_i = 0;
my $max_i = 100;
my $data = read_port();

while( $loop_i < $max_i )
{
    if( match_data($data) )
    {
        do_if_no_match($data);
    }
    else
    {
        do_if_no_match( $loop_i );
    }
    
    $data = read_port();
    $loop_i ++;
}

# End.