H3Error H3_EXPORT()

in h3_algos.c [221:253]

• 29 lines of code
• 5 McCabe index (conditional complexity)

H3Error H3_EXPORT(gridDiskDistances)(H3Index origin, int k, H3Index *out,
                                     int *distances) {
    // Optimistically try the faster gridDiskUnsafe algorithm first
    const H3Error failed =
        H3_EXPORT(gridDiskDistancesUnsafe)(origin, k, out, distances);
    if (failed) {
        int64_t maxIdx;
        H3Error err = H3_EXPORT(maxGridDiskSize)(k, &maxIdx);
        if (err) {
            return err;
        }
        // Fast algo failed, fall back to slower, correct algo
        // and also wipe out array because contents untrustworthy
        memset(out, 0, maxIdx * sizeof(H3Index));

        if (distances == NULL) {
            distances = H3_MEMORY(calloc)(maxIdx, sizeof(int));
            if (!distances) {
                return E_MEMORY_ALLOC;
            }
            H3Error result = _gridDiskDistancesInternal(origin, k, out,
                                                        distances, maxIdx, 0);
            H3_MEMORY(free)(distances);
            return result;
        } else {
            memset(distances, 0, maxIdx * sizeof(int));
            return _gridDiskDistancesInternal(origin, k, out, distances, maxIdx,
                                              0);
        }
    } else {
        return E_SUCCESS;
    }
}