+#include <stdint.h> /* for uint8_t */
struct World;
struct Map;
-/* 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.)
+/* 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(unsigned char err, struct World * world, char * msg);
+extern void exit_err(uint8_t err, struct World * world, char * msg);