From 1a52152852ff29c727673fc80e8bf8eca5ed6365 Mon Sep 17 00:00:00 2001
From: Aargh Rai <aargh.rai+git@gmail.com>
Date: Thu, 16 Jul 2026 14:08:24 +0530
Subject: starting pos, move count, test pass

---
 src/engine/moves/king.c | 47 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 3 deletions(-)

(limited to 'src/engine/moves/king.c')

diff --git a/src/engine/moves/king.c b/src/engine/moves/king.c
index 706cf9c..98c6ab9 100644
--- a/src/engine/moves/king.c
+++ b/src/engine/moves/king.c
@@ -42,15 +42,51 @@ void get_king_moves(moves_t* moves, position_t position) {
       .flags = ((enemy_pieces >> to) & 1) ? MOVE_CAPTURE : 0,
     );
   }
+
+  bitboard_t all_occupied = friendly_pieces | enemy_pieces;
+  if (position.turn == WHITE_TURN) {
+    if ((position.castling & WHITE_SHORT_CASTLE) &&
+        king_square == 4 &&
+        !((all_occupied >> 5) & 1) &&
+        !((all_occupied >> 6) & 1))
+    {
+      add_move(moves, 4, 6, .flags = MOVE_SHORT_CASTLE);
+    }
+    if ((position.castling & WHITE_LONG_CASTLE) &&
+        king_square == 4 &&
+        !((all_occupied >> 3) & 1) &&
+        !((all_occupied >> 2) & 1) &&
+        !((all_occupied >> 1) & 1))
+    {
+      add_move(moves, 4, 2, .flags = MOVE_LONG_CASTLE);
+    }
+  } else {
+    if ((position.castling & BLACK_SHORT_CASTLE) &&
+        king_square == 60 &&
+        !((all_occupied >> 61) & 1) &&
+        !((all_occupied >> 62) & 1))
+    {
+      add_move(moves, 60, 62, .flags = MOVE_SHORT_CASTLE);
+    }
+    if ((position.castling & BLACK_LONG_CASTLE) &&
+        king_square == 60 &&
+        !((all_occupied >> 59) & 1) &&
+        !((all_occupied >> 58) & 1) &&
+        !((all_occupied >> 57) & 1))
+    {
+      add_move(moves, 60, 58, .flags = MOVE_LONG_CASTLE);
+    }
+  }
 }
 
 #ifdef TEST_MOD
 #include <stdbool.h>
-#include "vec.c"
 
 bool test_white_king_corners() {
-  moves_t moves = moves_init();
+  moves_t moves;
+  moves_init(&moves);
   position_t p = {0};
+  p.bitboards[BLACK_KING] = 100;
   p.bitboards[WHITE_KING] = 1;
   p.turn = WHITE_TURN;
   get_king_moves(&moves, p);
@@ -82,12 +118,16 @@ bool test_white_king_corners() {
   if (moves.moves[2].from != 56) return false;
   if (moves.moves[2].to != 57) return false;
 
+  moves_deinit(moves);
   return true;
 }
 
 bool test_black_king_corners() {
-  moves_t moves = moves_init();
+  moves_t moves;
+  moves_init(&moves);
+
   position_t p = {0};
+  p.bitboards[WHITE_KING] = 100;
   p.bitboards[BLACK_KING] = 1;
   p.turn = BLACK_TURN;
   get_king_moves(&moves, p);
@@ -119,6 +159,7 @@ bool test_black_king_corners() {
   if (moves.moves[2].from != 56) return false;
   if (moves.moves[2].to != 57) return false;
 
+  moves_deinit(moves);
   return true;
 }
 #endif
-- 
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