extern const char * const bb_msg_memory_exhausted;
extern const char * const bb_msg_invalid_date;
extern const char * const bb_msg_io_error;
+extern const char * const bb_msg_read_error;
extern const char * const bb_msg_write_error;
extern const char * const bb_msg_name_longer_than_foo;
extern const char * const bb_msg_unknown;