random hex string from sqlite3's CSRNG

build.sh

gcc -g -Wall -O1 sqlite3/sqlite3.c main.c -o randid

main.c

#include "sqlite3\sqlite3.h"
#include <stdio.h>

void rand_hex(int n, unsigned char *randp, char *hex) {
    sqlite3_randomness(n, randp);

    char *ptr = &hex[0];
    for (int i = 0; i < n; ++i)
        ptr += sprintf (ptr, "%02X", randp[i]);
}

int main (int argc, char *argv[]) {
    int n = 16;

    if (argc > 1) {
        int r = sscanf(argv[1], "%i", &n);
        if ((r < 1) || (n > 2048)) return 1;
    }

    unsigned char randp[2049] = {'\0'};
    char rand_id[2049] = {'\0'};

    rand_hex(n, randp, rand_id);
    rand_id[n] = '\0';
    
    fprintf(stdout, "%s", rand_id);

    return 0;
}

test.sh

./randid 64
#expected output: E4ED9621EA47A138047C95FEB1F0CEE8FEA58BF58762B573DB8EE87998A8769