dt_status_t dt_timestamp_to_representation()

in src/win32/dt_win32.c [232:289]

• 43 lines of code
• 13 McCabe index (conditional complexity)

dt_status_t dt_timestamp_to_representation(const dt_timestamp_t *timestamp, const dt_timezone_t *timezone, dt_representation_t *representation)
{
    DWORD dwError = -1;
    SYSTEMTIME tLocalTime = {0};
    SYSTEMTIME tUniversalTime = {0};
    TIME_ZONE_INFORMATION tzi = {0};
    time_t time = 0;
    unsigned long nano = 0;
    struct tm result = {0};
    dt_status_t status = DT_UNKNOWN_ERROR;

    if (timestamp == NULL || representation == NULL) {
        return DT_INVALID_ARGUMENT;
    }


    if (timezone == NULL ) {
        dwError = GetTimeZoneInformation(&tzi);
        if (dwError != 0) {
            return DT_TIMEZONE_NOT_FOUND;
        }
    } else if (timezone->dtzi == NULL) {
        return DT_INVALID_ARGUMENT;
    }


    status = dt_timestamp_to_posix_time(timestamp, &time, &nano);
    if (status != DT_OK) {
        return status;
    }

    if (UnixTimeToSystemTime(&time, &tUniversalTime)) {
        //return DT_CONVERT_ERROR;
        return DT_INVALID_ARGUMENT; // TODO: Maybe to return a DT_SYSTEM_CALL_ERROR?
    }

    if (timezone != NULL && (GetTimeZoneInformationForYearLower(tUniversalTime.wYear, timezone, &tzi) == FALSE)) {
        //return DT_CONVERT_ERROR;
        return DT_INVALID_ARGUMENT; // TODO: Maybe to return a DT_SYSTEM_CALL_ERROR?
    }

    if (SystemTimeToTzSpecificLocalTime(&tzi, &tUniversalTime, &tLocalTime) == FALSE) {
        //return DT_CONVERT_ERROR;
        return DT_INVALID_ARGUMENT; // TODO: Maybe to return a DT_SYSTEM_CALL_ERROR?
    }

    if (TmFromSystemTime(&tLocalTime, &result) != EXIT_SUCCESS) {
        //return DT_CONVERT_ERROR;
        return DT_INVALID_ARGUMENT; // TODO: Maybe to return a DT_SYSTEM_CALL_ERROR?
    }

    status = dt_tm_to_representation(&result, nano, representation);
    if (status != DT_OK) {
        return status;
    }

    return DT_OK;
}