Convert DrivenEngine rlog/wlog to use BaseWriter

luprex/cpp/core/streambuffer.hpp

@@ -381,7 +381,11 @@ public:
     // Throw a StreamCorruption exception.
     void raise_truncated() { throw StreamCorruption(); }
     void raise_string_too_long() { throw StreamCorruption(); }
-
+    
+    // This is always false, because this module throws exceptions
+    // when reading beyond EOF.
+    bool read_beyond_eof() { return false; }
+    
 private:
     // Start and end of the allocated block.
     char *buf_lo_;