BIO_ctrl_pending() returns the number of bytes currently stored.
-BIO_set_mem_eof_return() sets the behavior of memory BIO B<b> when it is
+BIO_set_mem_eof_return() sets the behaviour of memory BIO B<b> when it is
empty. If the B<v> is zero then an empty memory BIO will return EOF (that is
it will return zero and BIO_should_retry(b) will be false. If B<v> is non
zero then it will return B<v> when it is empty and it will set the read retry