Bugfix: when --line is used, lengths passed buffer size aren't handled.

Bugfix: when --line is used, lengths passed buffer size aren't handled.

data->line is not a position, do not use it as a position (if (data->line < data->buffer.used) { is doing this).

If the line is exceeds the buffer, return f_data_not and properly handle that return case.
For --total, this means print 0.
For just about everything else, print nothing.