UUID String to C Array

main.c

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

#define CHAR2INT(x) (('0' <= x && x <= '9') ? \
    (x - '0') : \
    (('a' <= x && x <= 'f') ? \
        (10 + (x - 'a')) : \
        (('A' <= x && x <= 'F') ? (10 + (x - 'A')) : (0))))

#define UUID2ARRAY(uuid) { \
    16 * CHAR2INT(uuid[6]) + CHAR2INT(uuid[7]), \
    16 * CHAR2INT(uuid[4]) + CHAR2INT(uuid[5]), \
    16 * CHAR2INT(uuid[2]) + CHAR2INT(uuid[3]), \
    16 * CHAR2INT(uuid[0]) + CHAR2INT(uuid[1]), \
    \
    16 * CHAR2INT(uuid[11]) + CHAR2INT(uuid[12]), \
    16 * CHAR2INT(uuid[9]) + CHAR2INT(uuid[10]), \
    \
    16 * CHAR2INT(uuid[16]) + CHAR2INT(uuid[17]), \
    16 * CHAR2INT(uuid[14]) + CHAR2INT(uuid[15]), \
    \
    16 * CHAR2INT(uuid[19]) + CHAR2INT(uuid[20]), \
    16 * CHAR2INT(uuid[21]) + CHAR2INT(uuid[22]), \
    \
    16 * CHAR2INT(uuid[24]) + CHAR2INT(uuid[25]), \
    16 * CHAR2INT(uuid[26]) + CHAR2INT(uuid[27]), \
    16 * CHAR2INT(uuid[28]) + CHAR2INT(uuid[29]), \
    16 * CHAR2INT(uuid[30]) + CHAR2INT(uuid[31]), \
    16 * CHAR2INT(uuid[32]) + CHAR2INT(uuid[33]), \
    16 * CHAR2INT(uuid[34]) + CHAR2INT(uuid[35]), \
}

#define N 16

int main(int argc, char const *argv[]) {
    unsigned char test[N] = {0x11,0xb0,0xd7,0x97,0xda,0x54,0x35,0x48,0xb3,0xc4,0x91,0x7a,0xd6,0xe7,0x3d,0x74};
    unsigned char arr[N] = UUID2ARRAY("97D7B011-54DA-4835-B3C4-917AD6E73D74");

    for (int i = 0; i < N; i++) {
        printf("0x%x ",  arr[i]);
    }
    printf("\n");

    int ret = memcmp(test, arr, N);
    if (ret == 0) {
        printf("PASS\n");
    } else {
        printf("FAILED\n");
    }
    return ret;
}