Arguments and Values
read-byte reads and returns one byte from stream.
If an end of file occurs and eof-error-p is false, the eof-value is returned.
Should signal an error of type type-error if stream is not a stream.
Should signal an error of type error if stream is not a binary input stream.
If there are no bytes remaining in the stream and eof-error-p is true, an error of type end-of-file is signaled.