static BOOL dt_timezone_read_registry()

in src/win32/dt_win32.c [680:730]

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

static BOOL dt_timezone_read_registry(dt_timezone_t *timezone)
{
    HKEY hkey_tz = NULL;
    DWORD dwErrorCode = ERROR_RESOURCE_NOT_FOUND;
    BOOL  returnStatus = FALSE;
    char timeZoneName[128] = {0,};
    char *keyPath = NULL;
    size_t keyPathSize = sizeof(REG_TIME_ZONES) + sizeof(timeZoneName) + sizeof(DYNAMIC_DST) + sizeof('\\') + sizeof('\0');
    DWORD dwEnumIndex = 0;
    YEARS_ARRAY yearsArray = {0,};
    dt_tz_data_t *reg_tz_data = NULL;

    WideCharToMultiByte(CP_ACP, WC_COMPOSITECHECK, timezone->dtzi->TimeZoneKeyName, sizeof(timezone->dtzi->TimeZoneKeyName), timeZoneName, sizeof(timeZoneName), "\0", NULL);
    keyPath = malloc(keyPathSize);
    snprintf(keyPath, keyPathSize, "%s%s\\%s", REG_TIME_ZONES, timeZoneName, DYNAMIC_DST);

    dwErrorCode = RegOpenKeyA(HKEY_LOCAL_MACHINE, keyPath, &hkey_tz);
    if (ERROR_SUCCESS != dwErrorCode) {
        if (ERROR_FILE_NOT_FOUND != dwErrorCode) {
            return FALSE;
        } else {
            timezone->reg_tz_data_size = 0;
            return TRUE;
        }
    }

    if (createYearsArray(hkey_tz, yearsArray) != EXIT_SUCCESS) {
        returnStatus = FALSE;
        goto GetTimeZoneInformationForYearLower_cleanup;
    }

    timezone->reg_tz_data_size = yearsArray.count;
    timezone->reg_tz_data = malloc(sizeof(dt_tz_data_t) * timezone->reg_tz_data_size);
    memset(timezone->reg_tz_data, 0, sizeof(dt_tz_data_t) * timezone->reg_tz_data_size);
    reg_tz_data = timezone->reg_tz_data;

    for (dwEnumIndex = 0; dwEnumIndex < yearsArray.count && yearsArray.years[dwEnumIndex] != YEAR_WRONG_VALUE; dwEnumIndex++) {
        readYearTZDataFromRegistry(keyPath, dwEnumIndex, yearsArray, reg_tz_data);
    }

    if (yearsArray.size > 0) {
        free(yearsArray.years);
    }

    returnStatus = TRUE;
GetTimeZoneInformationForYearLower_cleanup:
    RegCloseKey(hkey_tz);
    free(keyPath);

    return returnStatus;
}