Method lookupCharset

src/jrd/intl.cpp:184–236

CharSetContainer* CharSetContainer::lookupCharset(thread_db* tdbb, USHORT ttype)
{
/**************************************
 *
 *      l o o k u p C h a r s e t
 *
 **************************************
 *
 * Functional description
 *
 *      Lookup a character set descriptor.
 *
 *      First, search the appropriate vector that hangs
 *      off the dbb.  If not found, then call the lower
 *      level lookup routine to allocate it, or punt
 *		if we don't know about the charset.
 *
 * Returns:
 *      *charset
 *      <never>         - if error
 *
 **************************************/
	CharSetContainer* cs = NULL;

	SET_TDBB(tdbb);
	Jrd::Attachment* attachment = tdbb->getAttachment();
	fb_assert(attachment);

	USHORT id = TTYPE_TO_CHARSET(ttype);
	if (id == CS_dynamic)
		id = tdbb->getCharSet();

	if (id >= attachment->att_charsets.getCount())
		attachment->att_charsets.resize(id + 10);
	else
		cs = attachment->att_charsets[id];

	// allocate a new character set object if we couldn't find one.
	if (!cs)
	{
		SubtypeInfo info;

		if (lookupInternalCharSet(id, &info) || MET_get_char_coll_subtype_info(tdbb, id, &info))
		{
			attachment->att_charsets[id] = cs =
				FB_NEW_POOL(*attachment->att_pool) CharSetContainer(*attachment->att_pool, id, &info);
		}
		else
			ERR_post(Arg::Gds(isc_text_subtype) << Arg::Num(ttype));
	}

	return cs;
}


// Lookup a system character set without looking in the database.