int string2ull(const char *s, unsigned long long *value) {
    long long ll;
    if (string2ll(s,strlen(s),&ll)) {
        if (ll < 0) return 0; /* Negative values are out of range. */
        *value = ll;
        return 1;
    }
    errno = 0;
    char *endptr = NULL;
    *value = strtoull(s,&endptr,10);
    if (errno == EINVAL || errno == ERANGE || !(*s != '\0' && *endptr == '\0'))
        return 0; /* strtoull() failed. */
    return 1; /* Conversion done! */
}

The product does not correctly convert an object, resource, or structure from one type to a different type.