bisearch
unidx = bisearch(ibm_val, st, st->table_size);
*unidx = bisearch(unicode, st, st->table_size);
unidx = bisearch(ibm_val, st, st->table_size);
int bisearch(unsigned long val, _icv_state *st, int n);
idx = bisearch(search_val, st, st->table_size);
int bisearch(unsigned long val, _icv_state *st, int n);
idx = bisearch(search_val, st, st->table_size);
*unidx = bisearch(unicode, st, st->table_size);
int bisearch(unsigned long val, _icv_state *st, int n);