问当3x3 tic tac toe板中的每一行和每一列都被X和O填充时，我如何结束循环？

EN

void CreateBoard(int m, int n, char board[][n])
{
    int i, j, position;
    int count = 0;
    do {
        SCAN:
        printf("Enter the number of the cell you want to insert X or O or enter -1 to exit: \n");
        scanf("%d", &position);

        if(position < 0){
            break;
        }
        if(position > 9){
            goto SCAN;
        }

        printf("Type X or O: \n");

        switch(position)
        {
            case 1: scanf(" %c", &board[0][0]); break;
            case 2: scanf(" %c", &board[0][1]); break;
            case 3: scanf(" %c", &board[0][2]); break;
            case 4: scanf(" %c", &board[1][0]); break;
            case 5: scanf(" %c", &board[1][1]); break;
            case 6: scanf(" %c", &board[1][2]); break;
            case 7: scanf(" %c", &board[2][0]); break;
            case 8: scanf(" %c", &board[2][1]); break;
            case 9: scanf(" %c", &board[2][2]); break;
        }

        for (int i = 0; i < m; i++)
        {
            for (int j = 0; j < n; j++)
            {
            printf("%c ", board[i][j]);
            if (j != 2)
                printf(" | ");
            }      
            if (i != 2)
                printf("\n------------");
            printf("\n");
        }

        count++;

        if(count == 10){
            break;
        }
    }while(position != -1);

}