gbk4_3rd_byte
if ( gbk4_3rd_byte( (unsigned char)**inbuf )) {
if ( gbk4_3rd_byte((unsigned char)**inbuf) ) {
if ( gbk4_3rd_byte((unsigned char)**inbuf) ) {
if ( gbk4_3rd_byte((unsigned char)**inbuf) ) {
if ( gbk4_3rd_byte((unsigned char)**inbuf) ) {
if ( gbk4_3rd_byte((unsigned char)**inbuf) )