Pass pointers to yx_uint16 structs to yx_uint16_cmp() instead of structs themselves.

[plomrogue] / src / yx_uint16.h

diff --git a/src/yx_uint16.h b/src/yx_uint16.h
index 3a13f0194a8b87564dac6d5f61280149550edf30..e5249b0ab3ca4e69685fc7a845209fb963af9760 100644 (file)
--- a/src/yx_uint16.h
+++ b/src/yx_uint16.h
@@ -1,19 +1,38 @@
+/* yx_uint16.h
+ *
+ * Structs and routines for coordinates and movement in 2-dimensional space
+ * (such as the ncurses screen and game maps).
+ */
+
 #ifndef YX_UINT16_H
 #define YX_UINT16_H
 
-#include <stdint.h>
 
-enum dir {
-  NORTH = 1,
-  EAST  = 2,
-  SOUTH = 3,
-  WEST  = 4 };
 
-struct yx_uint16 {
-  uint16_t y;
-  uint16_t x; };
+#include <stdint.h> /* for uint8_t, uint16_t */
+
+
+
+/* Coordinates for maps of max. 65536x65536 cells. */
+struct yx_uint16
+{
+    uint16_t y;
+    uint16_t x;
+};
+
+/* Directions available for movement. */
+enum dir
+{
+    NORTH = 1,
+    EAST,
+    SOUTH,
+    WEST
+};
+
+/* Return 1 if two yx_uint16 coordinates at "a" and "b" are equal, else 0. */
+extern uint8_t yx_uint16_cmp(struct yx_uint16 * a, struct yx_uint16 * b);
 
-extern char yx_uint16_cmp (struct yx_uint16, struct yx_uint16);
-extern struct yx_uint16 mv_yx_in_dir (enum dir, struct yx_uint16);
+/* Return yx_uint16 coordinate one step from coordinate yx in direction dir. */
+extern struct yx_uint16 mv_yx_in_dir(enum dir d, struct yx_uint16 yx);
 
 #endif