king DONE

1 files changed, 37 insertions, 0 deletions

diff --git a/src/search/king_moves.c b/src/search/king_moves.c
new file mode 100644
index 0000000..631b7f0
--- /dev/null
+++ b/src/search/king_moves.c
@@ -0,0 +1,37 @@
+#include "../search.h"
+
+void get_king_moves(moves_t* moves, position_t position) {
+  assert_valid_position(position);
+
+  bitboard_t friendly_king;
+  int king_square;
+  bitboard_t friendly_pieces;
+  if (position.turn == WHITE_TURN) {
+    friendly_pieces = whites(position);
+    friendly_king = position.bitboards[WHITE_KING];
+  } else {
+    friendly_pieces = blacks(position);
+    friendly_king = position.bitboards[BLACK_KING];
+  }
+  king_square = __builtin_ctzll(friendly_king);
+
+  bitboard_t movement;
+  if (king_square >= 10) {
+    movement = 920078ULL << (king_square - 10);
+  } else {
+    movement = 920078ULL >> -(king_square - 10);
+  }
+  if (friendly_king & BITMASK_FILE_A) {
+    movement &= BITMASK_FILE_A | BITMASK_FILE_B;
+  } else if (friendly_king & BITMASK_FILE_H) {
+    movement &= BITMASK_FILE_G | BITMASK_FILE_H;
+  }
+
+  movement &= ~friendly_pieces;
+  print_bitboard(movement);
+  while (movement) {
+    int to = __builtin_ctzll(movement);
+    movement &= movement - 1;
+    add_move(moves, king_square, to);
+  }
+}