gbk4_2nd_byte
if ( gbk4_2nd_byte((unsigned char) **inbuf )) {
#define gbk4_4th_byte(v) gbk4_2nd_byte(v)
} else if ( gbk4_2nd_byte((unsigned char)**inbuf) ) {
#define gbk4_4th_byte(v) gbk4_2nd_byte(v)
if ( gbk4_2nd_byte((unsigned char)**inbuf) ) {
#define gbk4_4th_byte(v) gbk4_2nd_byte(v)
} else if ( gbk4_2nd_byte((unsigned char)**inbuf) ) {
#define gbk4_4th_byte(v) gbk4_2nd_byte(v)
} else if ( gbk4_2nd_byte((unsigned char)**inbuf) ) {
#define gbk4_4th_byte(v) gbk4_2nd_byte(v)
} else if ( gbk4_2nd_byte((unsigned char)**inbuf) ) {
#define gbk4_4th_byte(v) gbk4_2nd_byte(v)