C :: Can't Get Tic-tac-toe Win Algorithm To Work

I am writing a simple console-based tic-tac-toe game. I am trying to write a function to check whether someone has won the game.

The board data is saved in an array called board: Code: int board[3][3] with each element corresponding either to an empty spot, an X, or an O, using the numbers 0, 1, and 2, respectively. For clarity:

Code:
#define EMPTY 0
#define X 1
#define O 2 Here is my function: Code: int check_state(int board[3][3]) {
int winner = 0;

[Code].....