--- /dev/null
+/* src/server/yx_uint8.c */
+
+#include "yx_uint8.h"
+#include <stdint.h> /* uint8_t, UINT8_MAX */
+#include "../common/yx_uint8.h" /* yx_uint8 struct */
+
+
+
+extern uint8_t yx_uint8_cmp(struct yx_uint8 * a, struct yx_uint8 * b)
+{
+ if (a->y == b->y && a->x == b->x)
+ {
+ return 1;
+ }
+ return 0;
+}
+
+
+
+extern struct yx_uint8 mv_yx_in_dir(char d, struct yx_uint8 yx)
+{
+ if (d == '8' && yx.y > 0)
+ {
+ yx.y--;
+ }
+ else if (d == '9' && yx.y > 0 && yx.x < UINT8_MAX)
+ {
+ yx.y--;
+ yx.x++;
+ }
+ else if (d == '6' && yx.x < UINT8_MAX)
+ {
+ yx.x++;
+ }
+ else if (d == '3' && yx.x < UINT8_MAX && yx.y < UINT8_MAX)
+ {
+ yx.y++;
+ yx.x++;
+ }
+ else if (d == '2' && yx.y < UINT8_MAX)
+ {
+ yx.y++;
+ }
+ else if (d == '1' && yx.y < UINT8_MAX && yx.x > 0)
+ {
+ yx.y++;
+ yx.x--;
+ }
+ else if (d == '4' && yx.x > 0)
+ {
+ yx.x--;
+ }
+ else if (d == '7' && yx.x > 0 && yx.y > 0)
+ {
+ yx.y--;
+ yx.x--;
+ }
+ return yx;
+}