and wishes to read more. If DONEP is true then the condition (<= START
USED END) must hold; the FUNC has consumed the buffer as far as USED
(exclusive) and has completed successfully; the values DONEP and `t' are
and wishes to read more. If DONEP is true then the condition (<= START
USED END) must hold; the FUNC has consumed the buffer as far as USED
(exclusive) and has completed successfully; the values DONEP and `t' are