+#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, exit with an error message "msg" and clean up. (For "err",
+ * pass the result of functions that return non-zero as an error status and
+ * thereby avoid bloating up the code with if-error-conditionals.)
+ */
+extern void exit_err(uint8_t err, struct World * world, char * msg);