text: #ifndef __LLIST_H
  #define __LLIST_H
  /***************************************************************************
   *                                  _   _ ____  _
   *  Project                     ___| | | |  _ \| |
   *                             / __| | | | |_) | |
   *                            | (__| |_| |  _ <| |___
   *                             \___|\___/|_| \_\_____|
   *
   * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
   *
   * This software is licensed as described in the file COPYING, which
   * you should have received as part of this distribution. The terms
   * are also available at http://curl.haxx.se/docs/copyright.html.
   *
   * You may opt to use, copy, modify, merge, publish, distribute and/or sell
   * copies of the Software, and permit persons to whom the Software is
   * furnished to do so, under the terms of the COPYING file.
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
   * KIND, either express or implied.
   *
   ***************************************************************************/
  
  #include "setup.h"
  #include <stddef.h>
  
  typedef void (*curl_llist_dtor)(void *, void *);
  
  struct curl_llist_element {
    void *ptr;
  
    struct curl_llist_element *prev;
    struct curl_llist_element *next;
  };
  
  struct curl_llist {
    struct curl_llist_element *head;
    struct curl_llist_element *tail;
  
    curl_llist_dtor dtor;
  
    size_t size;
  };
  
  void Curl_llist_init(struct curl_llist *, curl_llist_dtor);
  struct curl_llist *Curl_llist_alloc(curl_llist_dtor);
  int Curl_llist_insert_next(struct curl_llist *, struct curl_llist_element *,
                             const void *);
  int Curl_llist_insert_prev(struct curl_llist *, struct curl_llist_element *,
                             const void *);
  int Curl_llist_remove(struct curl_llist *, struct curl_llist_element *,
                        void *);
  int Curl_llist_remove_next(struct curl_llist *, struct curl_llist_element *,
                             void *);
  size_t Curl_llist_count(struct curl_llist *);
  void Curl_llist_destroy(struct curl_llist *, void *);
  int Curl_llist_move(struct curl_llist *, struct curl_llist_element *,
                      struct curl_llist *, struct curl_llist_element *);
  
  #endif
  