Function pj_generic_grid_init

src/grids.cpp:3213–3247

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ListOfGenericGrids pj_generic_grid_init(PJ *P, const char *gridkey) {
    std::string key("s");
    key += gridkey;
    const char *gridnames = pj_param(P->ctx, P->params, key.c_str()).s;
    if (gridnames == nullptr)
        return {};

    auto listOfGridNames = internal::split(std::string(gridnames), ',');
    ListOfGenericGrids grids;
    for (const auto &gridnameStr : listOfGridNames) {
        const char *gridname = gridnameStr.c_str();
        bool canFail = false;
        if (gridname[0] == '@') {
            canFail = true;
            gridname++;
        }
        auto gridSet = GenericShiftGridSet::open(P->ctx, gridname);
        if (!gridSet) {
            if (!canFail) {
                if (proj_context_errno(P->ctx) !=
                    PROJ_ERR_OTHER_NETWORK_ERROR) {
                    proj_context_errno_set(
                        P->ctx, PROJ_ERR_INVALID_OP_FILE_NOT_FOUND_OR_INVALID);
                }
                return {};
            }
            proj_context_errno_set(P->ctx,
                                   0); // don't treat as a persistent error
        } else {
            grids.emplace_back(std::move(gridSet));
        }
    }

    return grids;
}

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