105 lines
3.9 KiB
C
105 lines
3.9 KiB
C
/****************************************************************************
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* lib/stdio/lib_meminstream.c
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*
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* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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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 "lib_internal.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: meminstream_getc
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****************************************************************************/
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static int meminstream_getc(FAR struct lib_instream_s *this)
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{
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FAR struct lib_meminstream_s *mthis = (FAR struct lib_meminstream_s *)this;
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int ret;
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DEBUGASSERT(this);
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/* Get the next character (if any) from the buffer */
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if (this->nget < mthis->buflen)
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{
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ret = mthis->buffer[this->nget];
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this->nget++;
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}
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else
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{
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ret = EOF;
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}
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return ret;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_meminstream
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*
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* Description:
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* Initializes a stream for use with a fixed-size memory buffer.
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*
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* Input parameters:
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* meminstream - User allocated, uninitialized instance of struct
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* lib_meminstream_s to be initialized.
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* bufstart - Address of the beginning of the fixed-size memory buffer
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* buflen - Size of the fixed-sized memory buffer in bytes
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*
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* Returned Value:
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* None (meminstream initialized).
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*
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****************************************************************************/
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void lib_meminstream(FAR struct lib_meminstream_s *meminstream,
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FAR const char *bufstart, int buflen)
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{
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meminstream->public.get = meminstream_getc;
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meminstream->public.nget = 0; /* Will be buffer index */
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meminstream->buffer = bufstart; /* Start of buffer */
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meminstream->buflen = buflen; /* Length of the buffer */
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}
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