nuttx/libs/libc/queue/sq_count.c

/****************************************************************************
 * libs/libc/queue/sq_count.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <nuttx/queue.h>
#include <assert.h>

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: sq_count
 *
 * Description:
 *   Return the number of nodes in the queue.
 *
 ****************************************************************************/

size_t sq_count(FAR sq_queue_t *queue)
{
  FAR sq_entry_t *node;
  size_t count;

  DEBUGASSERT(queue != NULL);

  for (node = queue->head, count = 0;
       node != NULL;
       node = node->flink, count++);

  return count;
}