Method parse

src/common/TimeZoneUtil.cpp:457–503

Parses a time zone, offset- or region-based.

// Parses a time zone, offset- or region-based.
USHORT TimeZoneUtil::parse(const char* str, unsigned strLen, bool strict)
{
	// Non-strict parse is used to detect OS time zone.

	const char* end = str + strLen;
	const char* p = str;

	skipSpaces(p, end);

	const auto start = str;

	if (p < end && (*p == '-' || *p == '+'))
	{
		int sign = *p++ == '-' ? -1 : 1;
		skipSpaces(p, end);

		int tzh = parseNumber(p, end);

		if (tzh >= 0)
		{
			skipSpaces(p, end);

			if (!strict && p == end)
				return makeFromOffset(sign, tzh, 0);

			if (p < end && *p == ':')
			{
				++p;
				skipSpaces(p, end);
				int tzm = parseNumber(p, end);

				if (tzm >= 0)
				{
					skipSpaces(p, end);

					if (p == end)
						return makeFromOffset(sign, tzh, tzm);
				}
			}
		}

		status_exception::raise(Arg::Gds(isc_invalid_timezone_offset) << string(start, end));
		return 0;	// avoid warning
	}

	return parseRegion(p, str + strLen - p);
}

// Parses a time zone id from a region string.
USHORT TimeZoneUtil::parseRegion(const char* str, unsigned strLen)