int main()

in src/apps/filters/latLngToCell.c [60:122]
52 lines of code
9 McCabe index (conditional complexity)

int main(int argc, char *argv[]) {
    int res = 0;
    double lat = 0;
    double lng = 0;

    Arg helpArg = ARG_HELP;
    Arg resArg = {.names = {"-r", "--resolution"},
                  .required = true,
                  .scanFormat = "%d",
                  .valueName = "res",
                  .value = &res,
                  .helpText = "Resolution, 0-15 inclusive."};
    Arg latArg = {.names = {"--lat", "--latitude"},
                  .scanFormat = "%lf",
                  .valueName = "lat",
                  .value = &lat,
                  .helpText =
                      "Latitude in degrees. If not specified, \"latitude "
                      "longitude\" pairs will be read from standard input."};
    Arg lngArg = {.names = {"--lng", "--longitude"},
                  .scanFormat = "%lf",
                  .valueName = "lng",
                  .value = &lng,
                  .helpText = "Longitude in degrees."};

    Arg *args[] = {&helpArg, &resArg, &latArg, &lngArg};
    const int numArgs = 4;
    const char *helpText =
        "Convert degrees latitude/longitude coordinates to H3 indexes.";

    if (parseArgs(argc, argv, numArgs, args, &helpArg, helpText)) {
        return helpArg.found ? 0 : 1;
    }

    if (latArg.found != lngArg.found) {
        // One is found but the other is not.
        printHelp(stderr, argv[0], helpText, numArgs, args,
                  "Latitude and longitude must both be specified.", NULL);
        return 1;
    }

    if (latArg.found) {
        doCoords(lat, lng, res);
    } else {
        // process the lat/lng's on stdin
        char buff[BUFF_SIZE];
        while (1) {
            // get a lat/lng from stdin
            if (!fgets(buff, BUFF_SIZE, stdin)) {
                if (feof(stdin))
                    break;
                else
                    error("reading lat/lng");
            }

            if (sscanf(buff, "%lf %lf", &lat, &lng) != 2)
                error("parsing lat/lng");

            // convert to H3
            doCoords(lat, lng, res);
        }
    }
}