Random Path/Multidimensional Array

// Chapter 8 Programming Project #9

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>

#define SIZE 10
#define PATH_SIZE ((int) (sizeof(brd_path)))
#define ROW_SIZE ((int) (sizeof(board) / sizeof(board[0])))
#define UP y - 1
#define DOWN y + 1
#define LEFT x - 1
#define RIGHT x + 1

int main(void)
{
    char board[SIZE][SIZE] = {};
    char brd_path[26] = {'A', 'B', 'C', 'D', 'E', 'F', 'G',
                       'H', 'I', 'J', 'K', 'L', 'M', 'N',
                       'O', 'P', 'Q', 'R', 'S', 'T', 'U',
                       'V', 'W', 'X', 'Y', 'Z'};
    // 0 = Up, 1 = Down, 2 = Left, 3 = Right
    bool path_dir_chk[4] = {false};
    bool blocked = false;
    unsigned short i, j, x = 0, y = 0;

    srand((unsigned) time(NULL));
    int test, dir = rand() % 4;

    for (x = 0; x < ROW_SIZE; x++) {
        for (y = 0; y < ROW_SIZE; y++)
            board[x][y] = '.';
    }

    while (blocked != true) {
        for (i = 0; i < 26;) {
            // Reset path_dir_chk values if empty
            for (j = 0; j < 4; j++) {
                if (board[x][UP] == '.')
                    path_dir_chk[0] = false;
                if (board[x][DOWN] == '.')
                    path_dir_chk[1] = false;
                if (board[LEFT][y] == '.')
                    path_dir_chk[2] = false;
                if (board[RIGHT][y] == '.')
                    path_dir_chk[3] = false;
            }
            // Check the direction and replace that char
            if (dir == 0) {
                if (board[x][UP] == '.') {
                    board[x][UP] = brd_path[i];
                    y = UP;
                    printf("I is now: %d\n", ++i);
                }
            }
            if (dir == 1) {
                if (board[x][DOWN] == '.') {
                    board[x][DOWN] = brd_path[i];
                    y = DOWN;
                    printf("I is now: %d\n", ++i);
                }
            }
            if (dir == 2) {
                if (board[LEFT][y] == '.') {
                    board[LEFT][y] = brd_path[i];
                    y = LEFT;
                    printf("I is now: %d\n", ++i);
                }
            }
            if (dir == 3) {
                if (board[RIGHT][y] == '.') {
                    board[RIGHT][y] = brd_path[i];
                    y = RIGHT;
                    printf("I is now: %d\n", ++i);
                }
            }
            // Set path_dir_chk values if not empty
            for (int j = 0; j < 4; j++) {
                if (board[x][UP] != '.')
                    path_dir_chk[0] = true;
                if (board[x][DOWN] != '.')
                    path_dir_chk[1] = true;
                if (board[LEFT][y] != '.')
                    path_dir_chk[2] = true;
                if (board[RIGHT][y] != '.')
                    path_dir_chk[3] = true;
        }
        // if all path's are true exit
        if (path_dir_chk[0] == true &&
            path_dir_chk[1] == true &&
            path_dir_chk[2] == true &&
            path_dir_chk[3] == true)
            blocked = true;
        // Reset the random direction
        dir = rand() % 4;
        }
    }

    for (x = 0; x < ROW_SIZE; x++) {
        for (y = 0; y < ROW_SIZE; y++)
            printf("%c ", board[x][y]);
        printf("\n");
    }

    return 0;
}