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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* lists and queues implementations
*/
#ifndef _FRR_QUEUE_H
#define _FRR_QUEUE_H
#ifdef __cplusplus
extern "C" {
#endif
#if defined(__OpenBSD__) && !defined(STAILQ_HEAD)
#include "openbsd-queue.h"
/* Try to map FreeBSD implementation to OpenBSD one. */
#define STAILQ_HEAD(name, type) SIMPLEQ_HEAD(name, type)
#define STAILQ_HEAD_INITIALIZER(head) SIMPLEQ_HEAD_INITIALIZER(head)
#define STAILQ_ENTRY(entry) SIMPLEQ_ENTRY(entry)
#define STAILQ_CONCAT(head1, head2) SIMPLEQ_CONCAT(head1, head2)
#define STAILQ_EMPTY(head) SIMPLEQ_EMPTY(head)
#define STAILQ_FIRST(head) SIMPLEQ_FIRST(head)
#define STAILQ_FOREACH(var, head, field) SIMPLEQ_FOREACH(var, head, field)
#define STAILQ_FOREACH_SAFE(var, head, field, tvar) SIMPLEQ_FOREACH_SAFE(var, head, field, tvar)
#define STAILQ_INIT(head) SIMPLEQ_INIT(head)
#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) SIMPLEQ_INSERT_AFTER(head, tqelm, elm, field)
#define STAILQ_INSERT_HEAD(head, elm, field) SIMPLEQ_INSERT_HEAD(head, elm, field)
#define STAILQ_INSERT_TAIL(head, elm, field) SIMPLEQ_INSERT_TAIL(head, elm, field)
#define STAILQ_LAST(head, type, field) \
(SIMPLEQ_EMPTY((head)) \
? NULL \
: ((struct type *)(void *)((char *)((head)->sqh_last) \
- offsetof(struct type, field))))
#define STAILQ_NEXT(elm, field) SIMPLEQ_NEXT(elm, field)
#define STAILQ_REMOVE(head, elm, type, field) \
do { \
if (SIMPLEQ_FIRST((head)) == (elm)) { \
SIMPLEQ_REMOVE_HEAD((head), field); \
} else { \
struct type *curelm = SIMPLEQ_FIRST((head)); \
while (SIMPLEQ_NEXT(curelm, field) != (elm)) \
curelm = SIMPLEQ_NEXT(curelm, field); \
SIMPLEQ_REMOVE_AFTER(head, curelm, field); \
} \
} while (0)
#define STAILQ_REMOVE_AFTER(head, elm, field) SIMPLEQ_REMOVE_AFTER(head, elm, field)
#define STAILQ_REMOVE_HEAD(head, field) SIMPLEQ_REMOVE_HEAD(head, field)
#define STAILQ_SWAP(head1, head2, type) \
do { \
struct type *swap_first = STAILQ_FIRST(head1); \
struct type **swap_last = (head1)->sqh_last; \
STAILQ_FIRST(head1) = STAILQ_FIRST(head2); \
(head1)->sqh_last = (head2)->sqh_last; \
STAILQ_FIRST(head2) = swap_first; \
(head2)->sqh_last = swap_last; \
if (STAILQ_EMPTY(head1)) \
(head1)->sqh_last = &STAILQ_FIRST(head1); \
if (STAILQ_EMPTY(head2)) \
(head2)->sqh_last = &STAILQ_FIRST(head2); \
} while (0)
#else
#include "freebsd-queue.h"
#endif /* defined(__OpenBSD__) && !defined(STAILQ_HEAD) */
#ifndef TAILQ_POP_FIRST
#define TAILQ_POP_FIRST(head, field) \
({ typeof((head)->tqh_first) _elm = TAILQ_FIRST(head); \
if (_elm) { \
if ((TAILQ_NEXT((_elm), field)) != NULL) \
TAILQ_NEXT((_elm), field)->field.tqe_prev = \
&TAILQ_FIRST(head); \
else \
(head)->tqh_last = &TAILQ_FIRST(head); \
TAILQ_FIRST(head) = TAILQ_NEXT((_elm), field); \
}; _elm; })
#endif
#ifdef __cplusplus
}
#endif
#endif /* _FRR_QUEUE_H */
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