PathNode *path_shortest(int iFrom, int iTo, int directOnly){
  Stmt s;
  PathNode *pPrev;
  PathNode *p;

  path_reset();
  path.pStart = path_new_node(iFrom, 0, 0);
  if( iTo==iFrom ) return path.pStart;
  if( iTo==iFrom ){
    path.pEnd = path.pStart;
    return path.pStart;
  }
  if( directOnly ){
    db_prepare(&s, 
        "SELECT cid, 1 FROM plink WHERE pid=:pid AND isprim "
        "UNION ALL "
        "SELECT pid, 0 FROM plink WHERE cid=:pid AND isprim"
    );
  }else{

  int nChng = 0;           /* Number of files whose names have changed */
  int *aChng;              /* Two integers per name change */
  int i;                   /* Loop counter */
  Stmt q1;                 /* Query of name changes */

  *pnChng = 0;
  *aiChng = 0;
  if( iFrom==iTo ) return;
  path_reset();
  p = path_shortest(iFrom, iTo, 0);
  if( p==0 ) return;
  path_reverse_path();
  db_prepare(&q1,
     "SELECT pfnid, fnid FROM mlink WHERE mid=:mid AND pfnid>0"
  );