list.h

/* SPDX-License-Identifier: LGPL-2.1-only */
/*
 * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
 */
 
#ifndef NETLINK_LIST_H_
#define NETLINK_LIST_H_
 
#include <stddef.h>
 
struct nl_list_head
{
        struct nl_list_head *   next;
        struct nl_list_head *   prev;
};
 
static inline void NL_INIT_LIST_HEAD(struct nl_list_head *list)
{
        list->next = list;
        list->prev = list;
}
 
static inline void __nl_list_add(struct nl_list_head *obj,
                                 struct nl_list_head *prev,
                                 struct nl_list_head *next)
{
        prev->next = obj;
        obj->prev = prev;
        next->prev = obj;
        obj->next = next;
}
 
static inline void nl_list_add_tail(struct nl_list_head *obj,
                                    struct nl_list_head *head)
{
        __nl_list_add(obj, head->prev, head);
}
 
static inline void nl_list_add_head(struct nl_list_head *obj,
                                    struct nl_list_head *head)
{
        __nl_list_add(obj, head, head->next);
}
 
static inline void nl_list_del(struct nl_list_head *obj)
{
        obj->next->prev = obj->prev;
        obj->prev->next = obj->next;
}
 
static inline int nl_list_empty(struct nl_list_head *head)
{
        return head->next == head;
}
 
#define nl_container_of(ptr, type, member) ({                   \
        const __typeof__( ((type *)0)->member ) *__mptr = (ptr);\
        (type *)( (char *)__mptr - (offsetof(type, member)));})
 
#define nl_list_entry(ptr, type, member) \
        nl_container_of(ptr, type, member)
 
#define nl_list_at_tail(pos, head, member) \
        ((pos)->member.next == (head))
 
#define nl_list_at_head(pos, head, member) \
        ((pos)->member.prev == (head))
 
#define NL_LIST_HEAD(name) \
        struct nl_list_head name = { &(name), &(name) }
 
#define nl_list_first_entry(head, type, member)                 \
        nl_list_entry((head)->next, type, member)
 
#define nl_list_for_each_entry(pos, head, member)                               \
        for (pos = nl_list_entry((head)->next, __typeof__(*pos), member);       \
             &(pos)->member != (head);  \
             (pos) = nl_list_entry((pos)->member.next, __typeof__(*(pos)), member))
 
#define nl_list_for_each_entry_safe(pos, n, head, member)                       \
        for (pos = nl_list_entry((head)->next, __typeof__(*pos), member),       \
                n = nl_list_entry(pos->member.next, __typeof__(*pos), member);  \
             &(pos)->member != (head);                                  \
             pos = n, n = nl_list_entry(n->member.next, __typeof__(*n), member))
 
#define nl_init_list_head(head) \
        do { (head)->next = (head); (head)->prev = (head); } while (0)
 
#endif