/*
 * dlist.h -- dual list data structure
 * (C)Copyright 1998, 99 by Hiroshi Takekawa
 * Last Modified: Sat Oct 16 23:41:41 1999.
 * $Id: dlist.h,v 1.2 1999/10/18 12:26:53 sian Exp $
 */

#ifndef _DLIST_H_
#define _DLIST_H_

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct _dlist_data {
  void *data;
  struct _dlist_data *prev;
  struct _dlist_data *next;
} Dlist_data;

typedef struct _dlist {
  int ndata;
  Dlist_data *top;
  Dlist_data *head;
} Dlist;

Dlist *dlist_create(void);
int dlist_destroy(Dlist *, int);
Dlist_data *dlist_add(Dlist *, void *);
Dlist_data *dlist_stradd(Dlist *, char *);
int dlist_delete(Dlist *, Dlist_data *, int);
int dlist_move_to_top(Dlist *, Dlist_data *);
Dlist_data *dlist_gettop(Dlist *);
Dlist_data *dlist_gethead(Dlist *);
int dlist_getndata(Dlist *);

#endif