getopt_long_2.c

char getopt_long_2(int argc, char** argv, const char* optString, const struct option* longOpts, int* optIndex) {
    int c = getopt_long(argc, argv, optString, longOpts, optIndex);
    if (c == -1) {
        // No more options
        return c;
    }

    if (c == 0) {
        // Long option was specified -- find the short option
        c = longOpts[*optIndex].val;
    } else {
        // Short option was specified -- find the long option
        for (const struct option* i = longOpts; i->name != nullptr; ++i) {
            if (c == i->val) {
                *optIndex = i - longOpts;
                break;
            }
        }
    }

    // If the parameter requires an optional argument then
    // we need to work around some BS behavior of getopt_long here:
    // it expects optional arguments to be specified with =,
    // whereas it does not specify this requirement in literally
    // any another case >_>
    if (longOpts[*optIndex].has_arg == optional_argument &&
        optarg == nullptr &&
        optind < argc &&
        argv[optind][0] != '-') {
        optarg = argv[optind++];
    }

    return c;
}