text: /****************************************************************************
   * net/bluetooth/iob/iob_add_queue.c
   *
   *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name NuttX nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <tinyara/config.h>
  
  #include <assert.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <tinyara/bluetooth/iob/iob.h>
  
  #include "iob.h"
  
  #if CONFIG_IOB_NCHAINS > 0
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  #ifndef NULL
  #define NULL ((FAR void *)0)
  #endif
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: iob_add_queue_internal
   *
   * Description:
   *   Add one I/O buffer chain to the end of a queue.  May fail due to lack
   *   of resources.
   *
   ****************************************************************************/
  
  static int iob_add_queue_internal(FAR struct iob_s *iob, FAR struct iob_queue_s *iobq, FAR struct iob_qentry_s *qentry)
  {
  	/* Add the I/O buffer chain to the container */
  
  	qentry->qe_head = iob;
  
  	/* Add the container to the end of the queue */
  
  	qentry->qe_flink = NULL;
  	if (!iobq->qh_head) {
  		iobq->qh_head = qentry;
  		iobq->qh_tail = qentry;
  	} else {
  		DEBUGASSERT(iobq->qh_tail);
  		iobq->qh_tail->qe_flink = qentry;
  		iobq->qh_tail = qentry;
  	}
  
  	return 0;
  }
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: iob_add_queue
   *
   * Description:
   *   Add one I/O buffer chain to the end of a queue.  May fail due to lack
   *   of resources.
   *
   ****************************************************************************/
  
  int iob_add_queue(FAR struct iob_s *iob, FAR struct iob_queue_s *iobq)
  {
  	FAR struct iob_qentry_s *qentry;
  
  	/* Allocate a container to hold the I/O buffer chain */
  
  	qentry = iob_alloc_qentry();
  	if (!qentry) {
  		ioberr("ERROR: Failed to allocate a container\n");
  		return -ENOMEM;
  	}
  
  	return iob_add_queue_internal(iob, iobq, qentry);
  }
  
  /****************************************************************************
   * Name: iob_tryadd_queue
   *
   * Description:
   *   Add one I/O buffer chain to the end of a queue without waiting for
   *   resources to become free.
   *
   ****************************************************************************/
  
  int iob_tryadd_queue(FAR struct iob_s *iob, FAR struct iob_queue_s *iobq)
  {
  	FAR struct iob_qentry_s *qentry;
  
  	/* Allocate a container to hold the I/O buffer chain */
  
  	qentry = iob_tryalloc_qentry();
  	if (!qentry) {
  		ioberr("ERROR: Failed to allocate a container\n");
  		return -ENOMEM;
  	}
  
  	return iob_add_queue_internal(iob, iobq, qentry);
  }
  #endif							/* CONFIG_IOB_NCHAINS > 0 */
  