get_plane_no_by_big5
get_plane_no_by_big5(st, &unidx, &cnscode);
void get_plane_no_by_big5(_iconv_st * , int * , unsigned long *);
plane_no = get_plane_no_by_big5(st->keepc[0],
static int get_plane_no_by_big5(const char, const char, int*, unsigned long*);
plane_no = get_plane_no_by_big5(st->keepc[0],
static int get_plane_no_by_big5(const char, const char, int*, unsigned long*);