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84 lines
3.6 KiB
C
84 lines
3.6 KiB
C
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/*****************************************************************************
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Filename: mfifo.h
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Contents: header for MFIFO
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License/Copyright:
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Copyright (c) 2007, Jan Vidar Berger, Case Labs, Ltd. All rights reserved.
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email:janvb@caselaboratories.com
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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 are
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met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of the Case Labs, Ltd nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN 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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#ifndef _MFIFO
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#define _MFIFO
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/*****************************************************************************
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Struct: MINDEX
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Description: Message Index used to index a dynamic size Message FIFO.
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*****************************************************************************/
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typedef struct _mindex
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{
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int offset; /* offset to message in buf */
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int size; /* size of message in bytes */
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}MINDEX;
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/*****************************************************************************
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Struct: MFIFO
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Description: Message FIFO. Provides a dynamic sized message based FIFO
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queue.
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*****************************************************************************/
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typedef struct _mfifo
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{
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int first; /* first out */
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int last; /* last in + 1 */
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int bsize; /* buffer size */
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char *buf; /* ptr to start of buffer */
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int ixsize; /* index size */
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MINDEX ix[1]; /* message index */
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}MFIFO;
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/*****************************************************************************
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Function prototypes.
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*****************************************************************************/
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int MFIFOCreate(char *buf, int size, int index);
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void MFIFOClear(char * buf);
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int MFIFOGetLBOffset(char *buf);
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int MFIFOGetFBOffset(char *buf);
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void MFIFOWriteIX(char *buf, char *mes, int size, int ix, int off);
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int MFIFOWriteMes(char *buf, char *mes, int size);
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char * MFIFOGetMesPtr(char *buf, int *size);
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void MFIFOKillNext(char *buf);
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#endif
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