fix mouse movement and prevent moves on completed boards

uttt.c

@@ -77,7 +77,10 @@ int ut_move(struct ut_state *new_state, const struct ut_state *old_state, int ro
 	if (old_state->playBoard != -1 && old_state->playBoard != 3 * (row / 3) + (col / 3)) {return 1;}
 
 	// bad move - tile is occupied
-	if(old_state->tiles[row][col] != '\0') {return 1;} // replace with ' ' maybe
+	if(old_state->tiles[row][col] != '\0') {return 1;}
+
+	// bad move - board is finished
+	if(old_state->boards[row / 3][col / 3] != '\0') {return 1;}
 
 	// copy old_state->{tiles,boards} to new_state->{tiles,boards}
 	memmove(new_state->tiles, old_state->tiles, sizeof(old_state->tiles));
@@ -164,13 +167,10 @@ int ut_click(const struct ut_state *state, int *r, int *c)
 				{
 					if(event.y < 0 || event.y >= 21) {break;}
 					if(event.x < 0 || event.x >= 21) {break;}
-					*r = event.y % 7 - 1; // this messes up cursor position
-					*c = event.x % 7 - 1;
-					if(*r % 2 != 0) {break;}
-					if(*c % 2 != 0) {break;}
-					*r /= 2; *c /= 2;
-					*r += 3 * (event.y / 7);
-					*c += 3 * (event.x / 7);
+					*r = (event.y % 7 - 1) / 2 + 3 * (event.y / 7);
+					*c = (event.x % 7 - 1) / 2 + 3 * (event.x / 7);
+					if(((event.y % 7) - 1) % 2 != 0) {break;}
+					if(((event.x % 7) - 1) % 2 != 0) {break;}
 					return 0;
 				}
 				break;