initial commit

1 files changed, 62 insertions, 0 deletions

diff --git a/chess.h b/chess.h
new file mode 100644
index 0000000..b0b316e
--- /dev/null
+++ b/chess.h
@@ -0,0 +1,62 @@
+#include <unistd.h>
+#include <assert.h>
+#include <ctype.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#define COORD_END 0xdeadbeef
+#define ARRAYLEN(x) (sizeof(x)/sizeof((x)[0]))
+#define ABS(x) ((x)<0:-(x):(x))
+
+enum player { NONE = 0, WHITE, BLACK };
+enum piece { EMPTY = 0, PAWN, ROOK, KNIGHT, BISHOP, QUEEN, KING };
+
+struct piece_t {
+    enum piece type;
+    enum player color;
+};
+
+struct coordinates {
+    int y, x; /* 0-indexed */
+};
+
+struct promotion_t {
+    struct coordinates to, from;
+    enum piece type;
+};
+
+struct move_t {
+    enum player color;
+    enum { NORMAL, CASTLE, PROMOTION, NOMOVE } type;
+    union {
+        struct { struct coordinates to, from; } normal;
+        enum { QUEENSIDE, KINGSIDE } castle_style;
+        struct promotion_t promotion;
+    } data;
+};
+
+struct chess_ctx {
+    struct piece_t board[8][8]; /* [rank (y)],[file (x)] */
+    enum player to_move;
+    bool king_moved[2];
+    bool rook_moved[2][2]; /* [player][0=first file,1=eighth file] */
+};
+
+int eval_position(const struct chess_ctx *ctx, int color, int depth);
+struct move_t best_move(const struct chess_ctx *ctx, int *score, int depth);
+void execute_move(struct chess_ctx *ctx, struct move_t move);
+void gen_and_call(const struct chess_ctx *ctx,
+                  int y, int x,
+                  int dy, int dx,
+                  void (*cb)(void *data, const struct chess_ctx*, struct move_t),
+                  void *data, bool enforce, bool in_check);
+void for_each_move(const struct chess_ctx *ctx,
+                   int y, int x,
+                   void (*cb)(void *data, const struct chess_ctx*, struct move_t),
+                   void *data, bool enforce_check);
+struct move_t worst_move(const struct chess_ctx *ctx, int *score, int depth);
+bool king_in_check(const struct chess_ctx *ctx, int color);
+void print_ctx(const struct chess_ctx *ctx);