英语翻译，用的PCOMM库，如果读取的数据比定义的长度小，会怎么样

Question

If the length of data in the driver's input buffer is less than the buffer defined for sio_read(), all data in the driver's input buffer will be transferred to that of sio_read(). Otherwise, sio_read() reads specified length bytes from the driver's input buffer.

Answer 1