+#include <stdint.h> /* for uint8_t */
struct World;
struct Map;
-/* Exit orderly without message or on error with an error message ("msg").
- */
+/* Exit orderly, clean up. */
extern void exit_game(struct World * world);
-extern void exit_err(struct World * world, char * msg);
+
+
+
+/* If "err" == 0, do nothing. Else, clean up and exit with an error message that
+ * consists, first, of "msg" or (if "msg" is a NULL pointer) a generic "Details
+ * unknown", secondly of "err" as the "internal error code", and thirdly of
+ * errno if it is non-zero.
+ */
+extern void exit_err(uint8_t err, struct World * world, char * msg);