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struct item
{
void *data;
struct item *prev;
struct item *next;
};
/*
* Move element in item to the head of list mainlist.
*/
void movetohead(struct item **mainlist, struct item *item);
/*
* Create space for a new item and add it to the head of mainlist.
*
* Returns item or NULL if out of memory.
*/
struct item *additem(struct item **mainlist);
/*
* Delete item from list mainlist.
*/
void delitem(struct item **mainlist, struct item *item);
/*
* Free any data in current item and then delete item. Optionally
* update number of items in list if stored != NULL.
*/
void freeitem(struct item **list, int *stored,
struct item *item);
/*
* Delete all items in list. Optionally update number of items in list
* if stored != NULL.
*/
void delallitems(struct item **list, int *stored);
/*
* Print all items in mainlist on stdout.
*/
void listitems(struct item *mainlist);
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