Function YYYYMMDDToSystemTime2

source/util.cpp:95–129

DWORD YYYYMMDDToSystemTime2(LPTSTR aYYYYMMDD, SYSTEMTIME *aSystemTime)
// Calls YYYYMMDDToSystemTime() to fill up to two elements of the aSystemTime array.
// Returns 0 if the parameter is empty or invalid, otherwise a GDTR bitwise combination
// to indicate which of the two elements, or both, are present.
// Caller must ensure that aYYYYMMDD is a modifiable string since it's temporarily altered and restored here.
{
	DWORD gdtr = 0;
	if (!*aYYYYMMDD)
		return gdtr;
	if (*aYYYYMMDD != '-') // Since first char isn't a dash, there is a minimum present.
	{
		LPTSTR cp;
		if (cp = _tcschr(aYYYYMMDD + 1, '-'))
			*cp = '\0'; // Temporarily terminate in case only the leading part of the YYYYMMDD format is present.  Otherwise, the dash and other chars would be considered invalid fields.
		if (YYYYMMDDToSystemTime(aYYYYMMDD, aSystemTime[0], true)) // Date string is valid.
			gdtr |= GDTR_MIN; // Indicate that minimum is present.
		if (cp)
		{
			*cp = '-'; // Undo the temp. termination.
			aYYYYMMDD = cp + 1; // Set it to the maximum's position for use below.
		}
		else // No dash, so there is no maximum.  Indicate this by making aYYYYMMDD empty.
			aYYYYMMDD = _T("");
	}
	else // *aYYYYMMDD=='-', so only the maximum is present; thus there will be no minimum.
		++aYYYYMMDD; // Skip over the dash to set it to the maximum's position.
	if (*aYYYYMMDD) // There is a maximum.
	{
		if (YYYYMMDDToSystemTime(aYYYYMMDD, aSystemTime[1], true)) // Date string is valid.
			gdtr |= GDTR_MAX; // Indicate that maximum is present.
		else
			gdtr = 0; // Indicate that the value is invalid.
	}
	return gdtr;
}