Enforce legal moves

[dvonn] / dvonn-board.h

diff --git a/dvonn-board.h b/dvonn-board.h
index b0ee8cc46a449dfd5d7d4f4201b68140520567fe..66464d8dee95d9fbd421dfc466cb70e6b3dfada9 100644 (file)
--- a/dvonn-board.h
+++ b/dvonn-board.h
@@ -45,6 +45,7 @@ typedef enum {
 typedef struct {
     dvonn_cell_type_t type;
     int height;
+    dvonn_bool_t contains_red;
 } dvonn_cell_t;
 
 #define DVONN_BOARD_X_SIZE 11
@@ -87,4 +88,17 @@ dvonn_board_move (dvonn_board_t *board,
                int x2, int y2,
                char **error);
 
+/* Is the cell at (x,y) occupied by a piece. Returns FALSE for all
+ * out-of-bounds coordinates. */
+dvonn_bool_t
+dvonn_board_cell_occupied (dvonn_board_t *board,
+                          int x, int y);
+
+/* Is the cell at (x,y) surrounded by other pieces, (such that it is
+ * not legal for a piece at (x,y) to move. */
+dvonn_bool_t
+dvonn_board_cell_surrounded (dvonn_board_t *board,
+                            int x, int y);
+
+
 #endif