Example implementation

updateexample.c

find_pkg_updates(Pool *pool, Solvable *s) 
{
  Id p, pp, evr;
  Dataiterator di; 
  Solvable *is = 0;
  Queue q;

  /* first find installed package for the range */
  FOR_PROVIDES(p, pp, s->name) 
    {   
      Solvable *iscand = pool->solvables + p;
      if (!iscand->repo || iscand->repo != pool->installed)
        continue;
      if (iscand->name != s->name || iscand->arch != s->arch)
        continue;
      if (!is || pool_evrcmp(pool, is->evr, iscand->evr) < 0)
        is = iscand;
    }   
  queue_init(&q);
  dataiterator_init(&di, pool, 0, 0, UPDATE_COLLECTION_NAME, pool_id2str(pool, s->name), SEARCH_STRING);
  dataiterator_prepend_keyname(&di, UPDATE_COLLECTION);
  while (dataiterator_step(&di))
    {   
      dataiterator_setpos_parent(&di);
      if (pool_lookup_id(pool, SOLVID_POS, UPDATE_COLLECTION_ARCH) != s->arch)
        continue;
      evr = pool_lookup_id(pool, SOLVID_POS, UPDATE_COLLECTION_EVR);
      if (!evr)
        continue;
      if (is && pool_evrcmp(pool, is->evr, evr) >= 0)
        continue;       /* already installed */
      if (pool_evrcmp(pool, s->evr, evr) < 0)
        continue;
      queue_push(&q, di.solvid);
    }   
  dataiterator_free(&di);
}