input_event_size
if (count != 0 && count < input_event_size())
while (retval + input_event_size() <= count) {
retval += input_event_size();
if (count != 0 && count < input_event_size())
while (read + input_event_size() <= count &&
read += input_event_size();
if (count != 0 && count < input_event_size())
while (bytes + input_event_size() <= count) {
bytes += input_event_size();
while (read + input_event_size() <= count &&
read += input_event_size();
if (count != 0 && count < input_event_size())