list.h

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/* Simple Plugin API
 *
 * Copyright © 2018 Wim Taymans
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef SPA_LIST_H
#define SPA_LIST_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct spa_list {
        struct spa_list *next;
        struct spa_list *prev;
};
 
#define SPA_LIST_INIT(list) ((struct spa_list){ (list), (list) })
 
static inline void spa_list_init(struct spa_list *list)
{
        *list = SPA_LIST_INIT(list);
}
 
static inline int spa_list_is_initialized(struct spa_list *list)
{
        return !!list->prev;
}
 
#define spa_list_is_empty(l)  ((l)->next == (l))
 
static inline void spa_list_insert(struct spa_list *list, struct spa_list *elem)
{
        elem->prev = list;
        elem->next = list->next;
        list->next = elem;
        elem->next->prev = elem;
}
 
static inline void spa_list_insert_list(struct spa_list *list, struct spa_list *other)
{
        if (spa_list_is_empty(other))
                return;
        other->next->prev = list;
        other->prev->next = list->next;
        list->next->prev = other->prev;
        list->next = other->next;
}
 
static inline void spa_list_remove(struct spa_list *elem)
{
        elem->prev->next = elem->next;
        elem->next->prev = elem->prev;
}
 
#define spa_list_first(head, type, member)                              \
        SPA_CONTAINER_OF((head)->next, type, member)
 
#define spa_list_last(head, type, member)                               \
        SPA_CONTAINER_OF((head)->prev, type, member)
 
#define spa_list_append(list, item)                                     \
        spa_list_insert((list)->prev, item)
 
#define spa_list_prepend(list, item)                                    \
        spa_list_insert(list, item)
 
#define spa_list_is_end(pos, head, member)                              \
        (&(pos)->member == (head))
 
#define spa_list_next(pos, member)                                      \
        SPA_CONTAINER_OF((pos)->member.next, __typeof__(*(pos)), member)
 
#define spa_list_prev(pos, member)                                      \
        SPA_CONTAINER_OF((pos)->member.prev, __typeof__(*(pos)), member)
 
#define spa_list_consume(pos, head, member)                             \
        for ((pos) = spa_list_first(head, __typeof__(*(pos)), member);  \
             !spa_list_is_empty(head);                                  \
             (pos) = spa_list_first(head, __typeof__(*(pos)), member))
 
#define spa_list_for_each_next(pos, head, curr, member)                 \
        for ((pos) = spa_list_first(curr, __typeof__(*(pos)), member);  \
             !spa_list_is_end(pos, head, member);                       \
             (pos) = spa_list_next(pos, member))
 
#define spa_list_for_each_prev(pos, head, curr, member)                 \
        for ((pos) = spa_list_last(curr, __typeof__(*(pos)), member);   \
             !spa_list_is_end(pos, head, member);                       \
             (pos) = spa_list_prev(pos, member))
 
#define spa_list_for_each(pos, head, member)                            \
        spa_list_for_each_next(pos, head, head, member)
 
#define spa_list_for_each_reverse(pos, head, member)                    \
        spa_list_for_each_prev(pos, head, head, member)
 
#define spa_list_for_each_safe_next(pos, tmp, head, curr, member)       \
        for ((pos) = spa_list_first(curr, __typeof__(*(pos)), member);  \
             (tmp) = spa_list_next(pos, member),                                \
             !spa_list_is_end(pos, head, member);                       \
             (pos) = (tmp))
 
#define spa_list_for_each_safe_prev(pos, tmp, head, curr, member)       \
        for ((pos) = spa_list_last(curr, __typeof__(*(pos)), member);   \
             (tmp) = spa_list_prev(pos, member),                                \
             !spa_list_is_end(pos, head, member);                       \
             (pos) = (tmp))
 
#define spa_list_for_each_safe(pos, tmp, head, member)                  \
        spa_list_for_each_safe_next(pos, tmp, head, head, member)
 
#define spa_list_for_each_safe_reverse(pos, tmp, head, member)          \
        spa_list_for_each_safe_prev(pos, tmp, head, head, member)
 
#define spa_list_cursor_start(cursor, head, member)                     \
        spa_list_prepend(head, &(cursor).member)
 
#define spa_list_for_each_cursor(pos, cursor, head, member)             \
        for((pos) = spa_list_first(&(cursor).member, __typeof__(*(pos)), member); \
            spa_list_remove(&(pos)->member),                            \
            spa_list_append(&(cursor).member, &(pos)->member),          \
            !spa_list_is_end(pos, head, member);                        \
            (pos) = spa_list_next(&(cursor), member))
 
#define spa_list_cursor_end(cursor, member)                             \
        spa_list_remove(&(cursor).member)
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_LIST_H */