dirNode *dirNode::findNode(string pathname) {
 dirTokenizer path = dirTokenizer(pathname);
 string dir = path.next();
 dirNode *cur=this;
 if (cur‐>name != dir) return NULL;
 dir = path.next();
 if (dir == "") return cur;
 cur = cur‐>firstChild;
 while (cur != NULL) {
 if (cur‐>name != dir) {
 cur = cur‐>nextSibling;
 continue;
 }
 dir = path.next();
 if (dir == "") return cur;
 else cur = cur‐>firstChild;
 }
 return cur;
 }