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/* Linux kernel style list handling function
*
* Written from scratch by Timo Teräs <timo.teras@iki.fi>, but modeled
* after the linux kernel code.
*
* This file is free software: you may copy, redistribute and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef LIST_H
#define LIST_H
#ifndef NULL
#define NULL 0L
#endif
#ifndef offsetof
#ifdef __compiler_offsetof
#define offsetof(TYPE,MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#endif
#endif
#ifndef container_of
#define container_of(ptr, type, member) \
({ \
const typeof(((type *)0)->member) *__mptr = (ptr); \
(type *)((char *)__mptr - offsetof(type, member)); \
})
#endif
struct hlist_head {
struct hlist_node *first;
};
struct hlist_node {
struct hlist_node *next;
struct hlist_node **pprev;
};
static inline int hlist_empty(const struct hlist_head *h)
{
return !h->first;
}
static inline int hlist_hashed(const struct hlist_node *n)
{
return n->pprev != NULL;
}
static inline void hlist_del(struct hlist_node *n)
{
struct hlist_node *next = n->next;
struct hlist_node **pprev = n->pprev;
*pprev = next;
if (next)
next->pprev = pprev;
n->next = NULL;
n->pprev = NULL;
}
static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
{
struct hlist_node *first = h->first;
n->next = first;
if (first)
first->pprev = &n->next;
n->pprev = &h->first;
h->first = n;
}
static inline void hlist_add_after(struct hlist_node *n,
struct hlist_node *prev)
{
n->next = prev->next;
n->pprev = &prev->next;
prev->next = n;
}
static inline struct hlist_node **hlist_tail_ptr(struct hlist_head *h)
{
struct hlist_node *n = h->first;
if (n == NULL)
return &h->first;
while (n->next != NULL)
n = n->next;
return &n->next;
}
#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
#define hlist_for_each(pos, head) \
for (pos = (head)->first; pos; pos = pos->next)
#define hlist_for_each_safe(pos, n, head) \
for (pos = (head)->first; pos && ({ \
n = pos->next; \
1; \
}); \
pos = n)
#define hlist_for_each_entry(tpos, pos, head, member) \
for (pos = (head)->first; \
pos && ({ \
tpos = hlist_entry(pos, typeof(*tpos), member); \
1; \
}); \
pos = pos->next)
#define hlist_for_each_entry_safe(tpos, pos, n, head, member) \
for (pos = (head)->first; \
pos && ({ \
n = pos->next; \
1; \
}) \
&& ({ \
tpos = hlist_entry(pos, typeof(*tpos), member); \
1; \
}); \
pos = n)
struct list_head {
struct list_head *next, *prev;
};
#define LIST_INITIALIZER(l) { .next = &l, .prev = &l }
static inline void list_init(struct list_head *list)
{
list->next = list;
list->prev = list;
}
static inline void __list_add(struct list_head *new, struct list_head *prev,
struct list_head *next)
{
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}
static inline void list_add(struct list_head *new, struct list_head *head)
{
__list_add(new, head, head->next);
}
static inline void list_add_tail(struct list_head *new, struct list_head *head)
{
__list_add(new, head->prev, head);
}
static inline void __list_del(struct list_head *prev, struct list_head *next)
{
next->prev = prev;
prev->next = next;
}
static inline void list_del(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
entry->next = NULL;
entry->prev = NULL;
}
static inline int list_hashed(const struct list_head *n)
{
return n->next != n && n->next != NULL;
}
static inline int list_empty(const struct list_head *n)
{
return !list_hashed(n);
}
#define list_next(ptr, type, member) \
(list_hashed(ptr) ? container_of((ptr)->next, type, member) : NULL)
#define list_entry(ptr, type, member) container_of(ptr,type,member)
#define list_for_each(pos, head) \
for (pos = (head)->next; pos != (head); pos = pos->next)
#define list_for_each_safe(pos, n, head) \
for (pos = (head)->next, n = pos->next; pos != (head); \
pos = n, n = pos->next)
#define list_for_each_entry(pos, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member); \
&pos->member != (head); \
pos = list_entry(pos->member.next, typeof(*pos), member))
#define list_for_each_entry_safe(pos, n, head, member) \
for (pos = ((head)->next != head ? \
list_entry((head)->next, typeof(*pos), member) : \
NULL), \
n = (pos ? \
list_entry(pos->member.next, typeof(*pos), member) : NULL); \
pos && (&pos->member != (head)); \
pos = n, n = list_entry(n->member.next, typeof(*n), member))
#endif
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