Checks if a provided MAC address is valid

check_valid_mac.cpp

bool check_valid_mac(u_char *mac) {
    /* Check for the colons */
    for (int i = 2; i < strlen((char*)mac); i += 3) {
        if (mac[i] != ':') {
            return false;
        }
    }

    /* Check that the rest are valid characters */
    for (int i = 0; i < strlen((char*)mac); i++) {
        if (mac[i] != ':') {
            if (!isalpha(mac[i]) && !isdigit(mac[i])) {
                return false;
            }
        }
    }

    return true;
}