104 lines
4.2 KiB
C
104 lines
4.2 KiB
C
/****************************************************************************
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* libc/stdio/lib_memoutstream.c
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*
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* Copyright (C) 2007-2009, 2011-2012, 2014 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: memoutstream_putc
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****************************************************************************/
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static void memoutstream_putc(FAR struct lib_outstream_s *this, int ch)
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{
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FAR struct lib_memoutstream_s *mthis = (FAR struct lib_memoutstream_s *)this;
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DEBUGASSERT(this);
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/* If this will not overrun the buffer, then write the character to the
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* buffer. Not that buflen was pre-decremented when the stream was
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* created so it is okay to write past the end of the buflen by one.
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*/
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if (this->nput < mthis->buflen)
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{
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mthis->buffer[this->nput] = ch;
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this->nput++;
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mthis->buffer[this->nput] = '\0';
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}
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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_memoutstream
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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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* outstream - User allocated, uninitialized instance of struct
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* lib_memoutstream_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 (outstream initialized).
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*
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****************************************************************************/
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void lib_memoutstream(FAR struct lib_memoutstream_s *outstream,
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FAR char *bufstart, int buflen)
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{
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outstream->public.put = memoutstream_putc;
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#ifdef CONFIG_STDIO_LINEBUFFER
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outstream->public.flush = lib_noflush;
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#endif
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outstream->public.nput = 0; /* Will be buffer index */
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outstream->buffer = bufstart; /* Start of buffer */
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outstream->buflen = buflen - 1; /* Save space for null terminator */
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outstream->buffer[0] = '\0'; /* Start with an empty string */
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}
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