#ifndef YX_UINT16_H
#define YX_UINT16_H
-
-
#include <stdint.h> /* for uint8_t, uint16_t */
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);
-/* 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);
+/* Return yx_uint16 coordinate one step from coordinate yx in direction "dir"
+ * (east: 'E', west: 'W', north: 'N', south: 'S').
+ *
+ * If an invalid dir "d" is passed, "yx" remains unchanged.
+ */
+extern struct yx_uint16 mv_yx_in_dir(char dir, struct yx_uint16 yx);
+
+
#endif