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#pragma once
#include <stdlib.h>
#define LINK_OFFSET(type) ((size_t) &((type *)0)->link)
#define UPCAST(ptr, type) ({ \
const typeof( ((type *)0)->link ) *__mptr = (ptr); \
(type *)( (char *)__mptr - LINK_OFFSET(type) ); })
#define LIST_HEAD ((struct link) { .prev = NULL, .next = NULL })
#define LINK_EMPTY ((struct link) { 0 })
#define LINK(p) (&(p)->link)
struct link {
struct link *prev;
struct link *next;
};
/* list_XXX functions operate on the list head */
void list_free(struct link *head, void (*free_item)(void *), int offset);
int list_empty(struct link *head);
int list_len(struct link *head);
int list_ffind(struct link *head, struct link *link);
struct link *list_at(struct link *head, int n);
void list_push_front(struct link *head, struct link *link);
void list_push_back(struct link *head, struct link *link);
struct link *list_pop_front(struct link *head);
void link_prepend(struct link *list, struct link *link);
void link_append(struct link *list, struct link *link);
struct link *link_back(struct link *list);
struct link *link_pop(struct link *link);
struct link *link_iter(struct link *link, int n);
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