Represent maze heads more compactly

src/maze.c

@@ -10,7 +10,7 @@
 /* The list of heads: places that will be later incorporated into the maze. */
 struct heads {
 	struct head {
-		short x, y;
+		unsigned char x, y;
 	} *arr;
 	size_t len, cap;
 };

src/maze.h

@@ -18,7 +18,8 @@ struct maze {
 };
 
 /* The maximum width and height in nodes, chosen so that width * height (of type
- * int) can never overflow. */
+ * int) can never overflow, and so that x and y coordinates can each fit inside
+ * one byte. */
 #define MAZE_WIDTH_NODES_MAX 90
 #define MAZE_HEIGHT_NODES_MAX 90
 

src/player.c

@@ -7,7 +7,7 @@
 /* The list of player sight reveal heads. */
 struct heads {
 	struct head {
-		short x, y;
+		unsigned char x, y;
 	} *arr;
 	size_t len, cap;
 };

src/version.h

@@ -1,2 +1,2 @@
 /* The version of the program: */
-#define VERSION "0.5.13"
+#define VERSION "0.5.14"