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Diffstat (limited to '')
| -rw-r--r-- | lib/queue.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/lib/queue.h b/lib/queue.h new file mode 100644 index 0000000..26a5d4d --- /dev/null +++ b/lib/queue.h @@ -0,0 +1,83 @@ +// 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 */ |