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105 lines
4.2 KiB
105 lines
4.2 KiB
/**************************************************************************** |
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* libc/stdio/lib_memoutstream.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: 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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* memoutstream - 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 (memoutstream initialized). |
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* |
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****************************************************************************/ |
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void lib_memoutstream(FAR struct lib_memoutstream_s *memoutstream, |
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FAR char *bufstart, int buflen) |
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{ |
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memoutstream->public.put = memoutstream_putc; |
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#ifdef CONFIG_STDIO_LINEBUFFER |
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memoutstream->public.flush = lib_noflush; |
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#endif |
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memoutstream->public.nput = 0; /* Will be buffer index */ |
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memoutstream->buffer = bufstart; /* Start of buffer */ |
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memoutstream->buflen = buflen - 1; /* Save space for null terminator */ |
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memoutstream->buffer[0] = '\0'; /* Start with an empty string */ |
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} |
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