X-Git-Url: https://git.cworth.org/git?p=ttt;a=blobdiff_plain;f=src%2Fttt-board.c;h=73d2741c4c446a3386a634824178e6b1d04bfb59;hp=dd068b5850285110f84e5436f2fa99c960b2910d;hb=509e7fd528db9f7b1224b82aa955c978076dc2e5;hpb=b95a33abda8faac3638691dde70de0d59fadb30f

diff --git a/src/ttt-board.c b/src/ttt-board.c
index dd068b5..73d2741 100644
--- a/src/ttt-board.c
+++ b/src/ttt-board.c
@@ -19,7 +19,9 @@
  * Author: Carl Worth <cworth@cworth.org>
  */
 
+#include <stdio.h>
 #include "ttt-board.h"
+#include "ttt-error.h"
 
 /* Initialize an empty board. */
 void
@@ -30,6 +32,7 @@ ttt_board_init (ttt_board_t *board)
     {
 	board->cells[i] = TTT_CELL_EMPTY;
     }
+    board->current_player = TTT_CELL_X;
 }
 
 /* Initialize a board from its string representation.
@@ -82,3 +85,52 @@ ttt_board_write (ttt_board_t *board, FILE *file)
     free (s);
 }
 
+/* Makes a new move in the given board.
+ *
+ * The move value is a number from 0 to 9 giving the position to be
+ * moved as follows:
+ * 
+ *  0|1|2
+ *  3|4|5
+ *  6|7|8
+ *
+ * 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.
+ * 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;
+    for (i = 0; i <= 2; i++)
+    {
+	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]);
+	else 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);
+}