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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: ISC
*
* Permission to use, copy, modify, and distribute this software for any purpose
* with or without fee is hereby granted, provided that the above copyright
* notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef DLZ_LIST_H
#define DLZ_LIST_H 1
#define DLZ_LIST(type) \
struct { \
type *head, *tail; \
}
#define DLZ_LIST_INIT(list) \
do { \
(list).head = NULL; \
(list).tail = NULL; \
} while (0)
#define DLZ_LINK(type) \
struct { \
type *prev, *next; \
}
#define DLZ_LINK_INIT(elt, link) \
do { \
(elt)->link.prev = (void *)(-1); \
(elt)->link.next = (void *)(-1); \
} while (0)
#define DLZ_LIST_HEAD(list) ((list).head)
#define DLZ_LIST_TAIL(list) ((list).tail)
#define DLZ_LIST_APPEND(list, elt, link) \
do { \
if ((list).tail != NULL) \
(list).tail->link.next = (elt); \
else \
(list).head = (elt); \
(elt)->link.prev = (list).tail; \
(elt)->link.next = NULL; \
(list).tail = (elt); \
} while (0)
#define DLZ_LIST_PREV(elt, link) ((elt)->link.prev)
#define DLZ_LIST_NEXT(elt, link) ((elt)->link.next)
#define DLZ_LIST_UNLINK(list, elt, link) \
do { \
if ((elt)->link.next != NULL) \
(elt)->link.next->link.prev = (elt)->link.prev; \
else \
(list).tail = (elt)->link.prev; \
if ((elt)->link.prev != NULL) \
(elt)->link.prev->link.next = (elt)->link.next; \
else \
(list).head = (elt)->link.next; \
(elt)->link.prev = (void *)(-1); \
(elt)->link.next = (void *)(-1); \
} while (0)
#endif /* DLZ_LIST_H */
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