Function INTL_key_length

src/jrd/intl.cpp:982–1020

USHORT INTL_key_length(thread_db* tdbb, USHORT idxType, USHORT iLength)
{
/**************************************
 *
 *      I N T L _ k e y _ l e n g t h
 *
 **************************************
 *
 * Functional description
 *      Given an index type, and a maximum length (iLength)
 *      return the length of the byte string key descriptor to
 *      use when collating text of this type.
 *
 **************************************/
	SET_TDBB(tdbb);

	fb_assert(idxType >= idx_first_intl_string);

	const USHORT ttype = INTL_INDEX_TO_TEXT(idxType);

	USHORT key_length;
	if (ttype <= ttype_last_internal)
		key_length = iLength;
	else
	{
		TextType* obj = INTL_texttype_lookup(tdbb, ttype);
		key_length = obj->key_length(iLength);
	}

	// Validity checks on the computed key_length

	if (key_length > MAX_KEY)
		key_length = MAX_KEY;

	if (key_length < iLength)
		key_length = iLength;

	return (key_length);
}


CharSet* INTL_charset_lookup(thread_db* tdbb, USHORT parm1)