#ifndef LIST_INCLUDED
#define	LIST_INCLUDED

typedef struct list_entry
{
  struct list_entry *prev; /*+ Pointer to previous entry +*/
  struct list_entry *next; /*+ Pointer to next entry +*/
  void *data; /*+ Pointer to data item associated with this entry +*/
} ListEntry;

typedef struct
{
  ListEntry *head; /*+ Pointer to Entry at Head of List +*/
  ListEntry *tail; /*+ Pointer to Entry at Tail of List +*/
  ListEntry *current; /*+ Pointer to current Entry in List +*/
  ListEntry *prev; /*+ Pointer to next entry following current +*/
  ListEntry *next; /*+ Pointer to next entry following current +*/
} List;

List *ListCreate (void);
int ListFree (List *list, void (*func)());
int ListAddHead (List *list, void *data);
int ListAddTail (List *list, void *data);
List *ListMerge (List *list1, List *list2);
void ListSort (List *list, int (*func)());
int ListReset (List *list);
int ListTraverse (List *list, void **entry);
int ListTraverseBck (List *list, void **entry);
int ListDeleteEntry (List *list);
int ListInsertBefore (List *list, void *data);
int ListInsertAfter (List *list, void *data);
int ListSwapEntry (List *list);

#endif