forked from Archive/PX4-Autopilot
79 lines
2.8 KiB
C
79 lines
2.8 KiB
C
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/****************************************************************************
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* lib/queue/dq_remlast.c
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*
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* Copyright (C) 2007, 2008, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <queue.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/***************************************************(************************
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* Name: dq_remlast
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*
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* Description:
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* dq_remlast removes the last entry from 'queue'
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*
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****************************************************************************/
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FAR dq_entry_t *dq_remlast(dq_queue_t *queue)
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{
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FAR dq_entry_t *ret = queue->tail;
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if (ret)
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{
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FAR dq_entry_t *prev = ret->blink;
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if (!prev)
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{
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queue->head = NULL;
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queue->tail = NULL;
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}
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else
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{
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queue->tail = prev;
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prev->flink = NULL;
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}
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ret->flink = NULL;
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ret->blink = NULL;
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}
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return ret;
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}
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