Function run

extern/icu/tzdata/update-ids.cpp:56–197

int run(int argc, const char* argv[])
{
	if (argc != 4)
	{
		cerr << "Syntax: " << argv[0] << " <ids.dat file> <TimeZones.h file> <TimeZoneIds.h file>" << endl;
		return 1;
	}

	const unsigned MAX_ID = 65535;
	unordered_set<string> zonesSet;
	vector<string> zonesVector;

	for (unsigned i = 0; i < sizeof(BUILTIN_TIME_ZONE_LIST) / sizeof(BUILTIN_TIME_ZONE_LIST[0]); ++i)
	{
		zonesSet.insert(BUILTIN_TIME_ZONE_LIST[i]);
		zonesVector.push_back(BUILTIN_TIME_ZONE_LIST[i]);
	}

	UErrorCode icuErrorCode = U_ZERO_ERROR;

	const char* databaseVersion = ucal_getTZDataVersion(&icuErrorCode);
	cout << "Database version: " << databaseVersion << endl;

	UEnumeration* uenum = ucal_openTimeZones(&icuErrorCode);
	assert(uenum);

	int32_t length;
	char buffer[512];

	while (const UChar* str = uenum_unext(uenum, &length, &icuErrorCode))
	{
		for (unsigned i = 0; i <= length; ++i)
			buffer[i] = (char) str[i];

		if (zonesSet.find(buffer) == zonesSet.end())
		{
			cout << "New time zone included: " << buffer << "(" << (MAX_ID - zonesVector.size()) << ")." << endl;
			zonesVector.push_back(buffer);
		}
	}

	uenum_close(uenum);

	ofstream datStream, headerStream, idsHeaderStream;

	datStream.open(argv[1], std::fstream::out | std::fstream::trunc | std::fstream::binary);
	headerStream.open(argv[2], std::fstream::out | std::fstream::trunc);
	idsHeaderStream.open(argv[3], std::fstream::out | std::fstream::trunc);

	uint8_t byte;

	// file signature
	writeString(datStream, "FBTZ", true);

	// file format version
	const unsigned fileVersion = 1;
	byte = fileVersion & 0xFF;
	datStream.write((char*) &byte, 1);