65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/****************************************************************************
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* libs/libc/queue/sq_cat.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.h>
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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: sq_cat
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*
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* Description:
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* Move the content of queue1 to the end of queue2.
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*
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****************************************************************************/
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void sq_cat(FAR sq_queue_t *queue1, FAR sq_queue_t *queue2)
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{
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DEBUGASSERT(queue1 != NULL && queue2 != NULL);
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/* If queue2 is empty, then just move queue1 to queue2 */
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if (sq_empty(queue2))
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{
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sq_move(queue1, queue2);
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}
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/* Do nothing if queue1 is empty */
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else if (!sq_empty(queue1))
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{
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/* Attach the head of queue1 to the final entry of queue2 */
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queue2->tail->flink = queue1->head;
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/* The tail of queue1 is the new tail of queue2 */
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queue2->tail = queue1->tail;
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sq_init(queue1);
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}
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}
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