tsearch_inner
tsearch_inner( const void *key, struct hs_base* head,
tsearch_inner(p->keyptr,
tsearch_inner(n->keyptr,
r = tsearch_inner(key,head,compar,want_insert,&inserted,&nullme);
r = tsearch_inner(key,head,compar,only_find,&inserted,&nullme);
found = tsearch_inner(key,head,compar,want_delete,&inserted,