X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=src%2Fttt-board.c;h=273702185d8695ab312ef68275fcd4fecdcd3d1f;hb=7768c01e9aeec334dd3d5851fc2d1298317060dc;hp=dfddf35ec168297011979468231596785870dafd;hpb=a17b73b1671accfb7d68f6e07616a265ae64e500;p=ttt

diff --git a/src/ttt-board.c b/src/ttt-board.c
index dfddf35..2737021 100644
--- a/src/ttt-board.c
+++ b/src/ttt-board.c
@@ -104,20 +104,59 @@ ttt_error_t ttt_board_make_move (ttt_board_t *board, int move)
 	return TTT_ERROR_NOT_VALID_MOVE;
 
     board->cells[move] = board->current_player;
-
+    
     if (board->current_player == TTT_CELL_X)
-    {
-	ttt_board_is_won (board);
 	board->current_player = TTT_CELL_O;	
-    }
     else
 	board->current_player = TTT_CELL_X;
-    
     return TTT_ERROR_NONE;
 }
 
+/* Checks to see if a player has won the game and should be called
+ * after every move.
+ * 
+ * Returns: TTT_CELL_X if X's win. TTT_CELL_O if O's
+ * win. TTT_CELL_EMPTY if no win.  The game can then check the value
+ * of the return and declare the winner.
+ */
 
+ttt_cell_t ttt_board_is_won (ttt_board_t *board)
+{
+    int i;
 
+    /* Loop over rows and columns looking for a win. */
+    for (i = 0; i < 3; i++)
+    {
+	/* Check the current column */
+	if (board->cells[i] != TTT_CELL_EMPTY &&
+	    board->cells[i] == board->cells[i + 3] &&
+	    board->cells[i] == board->cells[i + 6])
+	{
+	    return board->cells[i];
+	}
+	
+	/* Check the current row */
+	if (board->cells[i * 3] != TTT_CELL_EMPTY &&
+	    board->cells[i * 3] == board->cells[(i * 3) + 1] &&
+	    board->cells[i * 3] == board->cells[(i * 3) + 2])
+	{
+	    return board->cells[i * 3];
+	}
+    }
 
+    if (board->cells[0] != TTT_CELL_EMPTY &&
+	board->cells[0] == board->cells[4] &&
+	board->cells[0]== board->cells[8])
+    {
+    	return board->cells[0];
+    }
 
+    if (board->cells[2] != TTT_CELL_EMPTY &&
+	board->cells[2] == board->cells[4] &&
+	board->cells[2]== board->cells[6])
+    {
+    	return board->cells[2];
+    }
 
+    return TTT_CELL_EMPTY;
+}