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4588 mejdrech 1 
/*
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 * Copyright (c) 2009 Lukas Mejdrech
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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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 *
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 * - 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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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup net
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 *  @{
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 */
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/** @file
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 *  Dynamic first in first out positive integer queue.
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 *  Possitive integer values only.
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 */
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#ifndef __NET_DYNAMIC_FIFO_H__
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#define __NET_DYNAMIC_FIFO_H__
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/** Type definition of the dynamic fifo queue.
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 *  @see dyn_fifo
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 */
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typedef struct dyn_fifo dyn_fifo_t;
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/** Type definition of the dynamic fifo queue pointer.
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 *  @see dyn_fifo
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 */
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typedef dyn_fifo_t *    dyn_fifo_ref;
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/** Dynamic first in first out positive integer queue.
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 *  Possitive integer values only.
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 *  The queue automatically resizes if needed.
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 */
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struct dyn_fifo{
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    /** Stored item field.
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     */
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    int *   items;
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    /** Actual field size.
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     */
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    int     size;
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    /** First item in the queue index.
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     */
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    int     head;
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    /** Last item in the queue index.
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     */
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    int     tail;
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    /** Consistency check magic value.
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     */
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    int     magic_value;
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};
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/** Initializes the dynamic queue.
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 *  @param[in,out] fifo The dynamic queue.
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 *  @param[in] size The initial queue size.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the queue is not valid.
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 *  @returns EBADMEM if the fifo parameter is NULL.
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 *  @returns ENOMEM if there is not enough memory left.
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 */
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int dyn_fifo_initialize( dyn_fifo_ref fifo, int size );
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/** Appends a new item to the queue end.
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 *  @param[in,out] fifo The dynamic queue.
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 *  @param[in] value The new item value. Should be positive.
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 *  @param[in] max_size The maximum queue size. The queue is not resized beyound this limit. May be zero or negative (<=0) to indicate no limit.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the queue is not valid.
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 *  @returns ENOMEM if there is not enough memory left.
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 */
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int dyn_fifo_push( dyn_fifo_ref fifo, int value, int max_size );
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/** Returns and excludes the first item in the queue.
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 *  @param[in,out] fifo The dynamic queue.
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 *  @returns Value of the first item in the queue.
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 *  @returns EINVAL if the queue is not valid.
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 *  @returns ENOENT if the queue is empty.
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 */
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int dyn_fifo_pop( dyn_fifo_ref fifo );
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/** Returns and keeps the first item in the queue.
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 *  @param[in,out] fifo The dynamic queue.
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 *  @returns Value of the first item in the queue.
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 *  @returns EINVAL if the queue is not valid.
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 *  @returns ENOENT if the queue is empty.
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 */
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int dyn_fifo_value( dyn_fifo_ref fifo );
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/** Clears and destroys the queue.
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 *  @param[in,out] fifo The dynamic queue.
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 *  @returns EOK on success.
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 *  @returns EINVAL if the queue is not valid.
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 */
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int dyn_fifo_destroy( dyn_fifo_ref fifo );
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#endif
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/** @}
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 */