зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
3.8 KiB
C
99 строки
3.8 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2002 Jason Evans <jasone@canonware.com>.
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* 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(s), this list of conditions and the following disclaimer
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* unmodified other than the allowable addition of one or more
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* copyright notices.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice(s), this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************/
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/* Ring definitions. */
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#define qr(a_type) \
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struct { \
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a_type *qre_next; \
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a_type *qre_prev; \
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}
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/* Ring functions. */
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#define qr_new(a_qr, a_field) do { \
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(a_qr)->a_field.qre_next = (a_qr); \
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(a_qr)->a_field.qre_prev = (a_qr); \
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} while (0)
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#define qr_next(a_qr, a_field) ((a_qr)->a_field.qre_next)
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#define qr_prev(a_qr, a_field) ((a_qr)->a_field.qre_prev)
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#define qr_before_insert(a_qrelm, a_qr, a_field) do { \
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(a_qr)->a_field.qre_prev = (a_qrelm)->a_field.qre_prev; \
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(a_qr)->a_field.qre_next = (a_qrelm); \
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(a_qr)->a_field.qre_prev->a_field.qre_next = (a_qr); \
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(a_qrelm)->a_field.qre_prev = (a_qr); \
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} while (0)
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#define qr_after_insert(a_qrelm, a_qr, a_field) \
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do \
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{ \
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(a_qr)->a_field.qre_next = (a_qrelm)->a_field.qre_next; \
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(a_qr)->a_field.qre_prev = (a_qrelm); \
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(a_qr)->a_field.qre_next->a_field.qre_prev = (a_qr); \
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(a_qrelm)->a_field.qre_next = (a_qr); \
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} while (0)
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#define qr_meld(a_qr_a, a_qr_b, a_field) do { \
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void *t; \
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(a_qr_a)->a_field.qre_prev->a_field.qre_next = (a_qr_b); \
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(a_qr_b)->a_field.qre_prev->a_field.qre_next = (a_qr_a); \
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t = (a_qr_a)->a_field.qre_prev; \
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(a_qr_a)->a_field.qre_prev = (a_qr_b)->a_field.qre_prev; \
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(a_qr_b)->a_field.qre_prev = t; \
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} while (0)
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/* qr_meld() and qr_split() are functionally equivalent, so there's no need to
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* have two copies of the code. */
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#define qr_split(a_qr_a, a_qr_b, a_field) \
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qr_meld((a_qr_a), (a_qr_b), a_field)
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#define qr_remove(a_qr, a_field) do { \
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(a_qr)->a_field.qre_prev->a_field.qre_next \
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= (a_qr)->a_field.qre_next; \
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(a_qr)->a_field.qre_next->a_field.qre_prev \
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= (a_qr)->a_field.qre_prev; \
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(a_qr)->a_field.qre_next = (a_qr); \
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(a_qr)->a_field.qre_prev = (a_qr); \
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} while (0)
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#define qr_foreach(var, a_qr, a_field) \
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for ((var) = (a_qr); \
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(var) != NULL; \
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(var) = (((var)->a_field.qre_next != (a_qr)) \
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? (var)->a_field.qre_next : NULL))
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#define qr_reverse_foreach(var, a_qr, a_field) \
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for ((var) = ((a_qr) != NULL) ? qr_prev(a_qr, a_field) : NULL; \
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(var) != NULL; \
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(var) = (((var) != (a_qr)) \
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? (var)->a_field.qre_prev : NULL))
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