WIP refactor

common.h

@@ -0,0 +1,26 @@
+
+#include <stdint.h>  /* int32_t */
+#include <stddef.h>  /* ptrdiff_t */
+#include <stdbool.h> /* true, false, bool */
+
+/** Type representing piece/tile on a chessboard */
+typedef int32_t tile_t;
+
+/** Type representing index of a chessboard tile */
+typedef ptrdiff_t index_t;
+
+#define BOARD_SIZE ((index_t)(8 * 8))
+
+#define WHITE 1
+#define BLACK -1
+
+#define E ((tile_t)0) ///< empty tile
+#define K ((tile_t)1) ///< king
+#define Q ((tile_t)2) ///< queen
+#define R ((tile_t)3) ///< rook
+#define B ((tile_t)4) ///< bishop
+#define N ((tile_t)5) ///< knight
+#define P ((tile_t)6) ///< pawn
+
+#define ROW ((index_t)8)
+#define COL ((index_t)1)