On streams that support it, this function reads multiple bytes of
data into a buffer. The buffer must be a
(simple-array (unsigned-byte 8) (*)). The argument
nbytes specifies the desired number of bytes, and the return
value is the number of bytes actually read.
end-of-filecondition is signalled if end-of-file is encountered before count bytes have been read.
read-n-bytes readsas much data is currently available (up to count bytes.) On pipes or similar devices, this function returns as soon as any data is available, even if the amount read is less than count and eof has not been hit. See also