105 lines
3.9 KiB
C
105 lines
3.9 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_memoutstream.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 "libc.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_puts
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****************************************************************************/
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static int memoutstream_puts(FAR struct lib_outstream_s *this,
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FAR const void *buf, int len)
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{
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FAR struct lib_memoutstream_s *mthis =
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(FAR struct lib_memoutstream_s *)this;
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int ncopy;
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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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ncopy = mthis->buflen - this->nput >= len ?
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len : mthis->buflen - this->nput;
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if (ncopy > 0)
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{
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memcpy(mthis->buffer + this->nput, buf, ncopy);
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this->nput += ncopy;
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mthis->buffer[this->nput] = '\0';
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}
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return ncopy;
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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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char tmp = ch;
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(void)memoutstream_puts(this, &tmp, 1);
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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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outstream->public.puts = memoutstream_puts;
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outstream->public.flush = lib_noflush;
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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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