read-byte stream &optional eof-error-p eof-value ⇒ byte
| stream | a binary input stream. |
| eof-error-p | a generalized boolean. The default is true. |
| eof-value | an object. The default is nil. |
| byte | an integer, or the eof-value. |
read-byte reads and returns one byte from stream.
If an end of file_2 occurs and eof-error-p is false, the eof-value is returned.
(with-open-file (s "temp-bytes"
:direction :output
:element-type 'unsigned-byte)
(write-byte 101 s)) ⇒ 101
(with-open-file (s "temp-bytes" :element-type 'unsigned-byte)
(format t "~S ~S" (read-byte s) (read-byte s nil 'eof)))
|> 101 EOF
⇒ NIL
Modifies stream.
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.