X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=src%2Fttt-board.c;h=273702185d8695ab312ef68275fcd4fecdcd3d1f;hb=7768c01e9aeec334dd3d5851fc2d1298317060dc;hp=8c34b3e0074165300f35958e73be7637bde7081f;hpb=e9d5cb082314c9a5f875519cbde6b5ff7ecadd41;p=ttt

diff --git a/src/ttt-board.c b/src/ttt-board.c
index 8c34b3e..2737021 100644
--- a/src/ttt-board.c
+++ b/src/ttt-board.c
@@ -94,31 +94,69 @@ ttt_board_write (ttt_board_t *board, FILE *file)
  *  3|4|5
  *  6|7|8
  *
- * Returns: 1 if a move is made succesfully. O if a move is invalid
- * (the given cell is not empty).
- *
- * Bugs: Currently this function always places X for all moves. So,
- * yeah, we'll need to fix that.
+ * Returns: TTT_ERROR_NONE if a move is made succesfully. TTT_ERROR_NOT_VALID_MOVE
+ * if a move is invalid (the given cell is not empty).
  */
 
- 
 ttt_error_t ttt_board_make_move (ttt_board_t *board, int move)
 {  
     if (board->cells[move] != TTT_CELL_EMPTY)
 	return TTT_ERROR_NOT_VALID_MOVE;
 
     board->cells[move] = board->current_player;
-
+    
     if (board->current_player == TTT_CELL_X)
 	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;
+}