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91be0d8ce3
probably want to do something similar in sys/queue.h; it's bad to have STAILQ_LAST() generate GCC warnings.
228 lines
7.1 KiB
C
228 lines
7.1 KiB
C
/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)queue.h 8.5 (Berkeley) 8/20/94
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* $FreeBSD$
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*
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* $FreeBSD$
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*/
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#ifndef _QUEUE_H_
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#define _QUEUE_H_
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#undef __ofsetof
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#define __offsetof(type, field) ((size_t)(&((type *)0)->field))
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/*
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* Singly-linked Tail queue declarations.
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*/
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#undef STAILQ_HEAD
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#define STAILQ_HEAD(name, type) \
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struct name { \
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struct type *stqh_first;/* first element */ \
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struct type **stqh_last;/* addr of last next element */ \
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}
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#undef STAILQ_HEAD_INITIALIZER
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#define STAILQ_HEAD_INITIALIZER(head) \
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{ NULL, &(head).stqh_first }
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#undef STAILQ_ENTRY
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#define STAILQ_ENTRY(type) \
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struct { \
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struct type *stqe_next; /* next element */ \
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}
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#undef STAILQ_EMPTY
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#define STAILQ_EMPTY(head) ((head)->stqh_first == NULL)
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#undef STAILQ_FIRST
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#define STAILQ_FIRST(head) ((head)->stqh_first)
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#undef STAILQ_FOREACH
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#define STAILQ_FOREACH(var, head, field) \
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for((var) = STAILQ_FIRST((head)); \
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(var); \
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(var) = STAILQ_NEXT((var), field))
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#undef STAILQ_FOREACH_SAFE
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#define STAILQ_FOREACH_SAFE(var, head, field, tvar) \
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for ((var) = STAILQ_FIRST((head)); \
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(var) && ((tvar) = STAILQ_NEXT((var), field), 1); \
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(var) = (tvar))
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#undef STAILQ_INIT
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#define STAILQ_INIT(head) do { \
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STAILQ_FIRST((head)) = NULL; \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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#undef STAILQ_INSERT_AFTER
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#define STAILQ_INSERT_AFTER(head, tqelm, elm, field) do { \
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if ((STAILQ_NEXT((elm), field) = STAILQ_NEXT((tqelm), field)) == NULL)\
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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STAILQ_NEXT((tqelm), field) = (elm); \
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} while (0)
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#undef STAILQ_INSERT_HEAD
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#define STAILQ_INSERT_HEAD(head, elm, field) do { \
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if ((STAILQ_NEXT((elm), field) = STAILQ_FIRST((head))) == NULL) \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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STAILQ_FIRST((head)) = (elm); \
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} while (0)
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#undef STAILQ_INSERT_TAIL
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#define STAILQ_INSERT_TAIL(head, elm, field) do { \
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STAILQ_NEXT((elm), field) = NULL; \
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*(head)->stqh_last = (elm); \
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(head)->stqh_last = &STAILQ_NEXT((elm), field); \
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} while (0)
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#undef STAILQ_LAST
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#define STAILQ_LAST(head, type, field) \
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(STAILQ_EMPTY((head)) ? \
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NULL : \
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((struct type *)(void *) \
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((char *)((head)->stqh_last) - __offsetof(struct type, field))))
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#undef STAILQ_NEXT
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#define STAILQ_NEXT(elm, field) ((elm)->field.stqe_next)
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#undef STAILQ_REMOVE
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#define STAILQ_REMOVE(head, elm, type, field) do { \
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if (STAILQ_FIRST((head)) == (elm)) { \
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STAILQ_REMOVE_HEAD((head), field); \
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} \
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else { \
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struct type *curelm = STAILQ_FIRST((head)); \
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while (STAILQ_NEXT(curelm, field) != (elm)) \
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curelm = STAILQ_NEXT(curelm, field); \
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if ((STAILQ_NEXT(curelm, field) = \
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STAILQ_NEXT(STAILQ_NEXT(curelm, field), field)) == NULL)\
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(head)->stqh_last = &STAILQ_NEXT((curelm), field);\
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} \
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} while (0)
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#undef STAILQ_REMOVE_HEAD
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#define STAILQ_REMOVE_HEAD(head, field) do { \
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if ((STAILQ_FIRST((head)) = \
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STAILQ_NEXT(STAILQ_FIRST((head)), field)) == NULL) \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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#undef STAILQ_REMOVE_HEAD_UNTIL
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#define STAILQ_REMOVE_HEAD_UNTIL(head, elm, field) do { \
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if ((STAILQ_FIRST((head)) = STAILQ_NEXT((elm), field)) == NULL) \
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(head)->stqh_last = &STAILQ_FIRST((head)); \
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} while (0)
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/*
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* List declarations.
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*/
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#undef LIST_HEAD
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#define LIST_HEAD(name, type) \
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struct name { \
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struct type *lh_first; /* first element */ \
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}
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#undef LIST_HEAD_INITIALIZER
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#define LIST_HEAD_INITIALIZER(head) \
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{ NULL }
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#undef LIST_ENTRY
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#define LIST_ENTRY(type) \
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struct { \
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struct type *le_next; /* next element */ \
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struct type **le_prev; /* address of previous next element */ \
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}
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/*
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* List functions.
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*/
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#undef LIST_EMPTY
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#define LIST_EMPTY(head) ((head)->lh_first == NULL)
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#undef LIST_FIRST
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#define LIST_FIRST(head) ((head)->lh_first)
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#undef LIST_FOREACH
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#define LIST_FOREACH(var, head, field) \
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for ((var) = LIST_FIRST((head)); \
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(var); \
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(var) = LIST_NEXT((var), field))
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#undef LIST_FOREACH_SAFE
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#define LIST_FOREACH_SAFE(var, head, field, tvar) \
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for ((var) = LIST_FIRST((head)); \
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(var) && ((tvar) = LIST_NEXT((var), field), 1); \
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(var) = (tvar))
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#undef LIST_INIT
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#define LIST_INIT(head) do { \
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LIST_FIRST((head)) = NULL; \
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} while (0)
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#undef LIST_INSERT_AFTER
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#define LIST_INSERT_AFTER(listelm, elm, field) do { \
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if ((LIST_NEXT((elm), field) = LIST_NEXT((listelm), field)) != NULL)\
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LIST_NEXT((listelm), field)->field.le_prev = \
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&LIST_NEXT((elm), field); \
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LIST_NEXT((listelm), field) = (elm); \
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(elm)->field.le_prev = &LIST_NEXT((listelm), field); \
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} while (0)
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#undef LIST_INSERT_BEFORE
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#define LIST_INSERT_BEFORE(listelm, elm, field) do { \
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(elm)->field.le_prev = (listelm)->field.le_prev; \
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LIST_NEXT((elm), field) = (listelm); \
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*(listelm)->field.le_prev = (elm); \
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(listelm)->field.le_prev = &LIST_NEXT((elm), field); \
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} while (0)
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#undef LIST_INSERT_HEAD
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#define LIST_INSERT_HEAD(head, elm, field) do { \
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if ((LIST_NEXT((elm), field) = LIST_FIRST((head))) != NULL) \
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LIST_FIRST((head))->field.le_prev = &LIST_NEXT((elm), field);\
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LIST_FIRST((head)) = (elm); \
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(elm)->field.le_prev = &LIST_FIRST((head)); \
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} while (0)
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#undef LIST_NEXT
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#define LIST_NEXT(elm, field) ((elm)->field.le_next)
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#undef LIST_REMOVE
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#define LIST_REMOVE(elm, field) do { \
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if (LIST_NEXT((elm), field) != NULL) \
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LIST_NEXT((elm), field)->field.le_prev = \
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(elm)->field.le_prev; \
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*(elm)->field.le_prev = LIST_NEXT((elm), field); \
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} while (0)
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#endif /* !_QUEUE_H_ */
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