b96035885a
Improve performance for raw fd based printf like operation. Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
121 lines
3.9 KiB
C
121 lines
3.9 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_bufferedoutstream.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 <nuttx/config.h>
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#include <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/fs/fs.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: bufferedoutstream_flush
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****************************************************************************/
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static int bufferedoutstream_flush(FAR struct lib_outstream_s *this)
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{
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FAR struct lib_bufferedoutstream_s *rthis =
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(FAR struct lib_bufferedoutstream_s *)this;
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int ret = OK;
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ret = lib_stream_puts(rthis->backend, rthis->buffer,
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rthis->pending);
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if (ret >= 0)
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{
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rthis->pending = 0;
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}
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return ret;
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}
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/****************************************************************************
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* Name: bufferedoutstream_puts
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****************************************************************************/
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static int bufferedoutstream_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_bufferedoutstream_s *rthis =
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(FAR struct lib_bufferedoutstream_s *)this;
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int ret = len;
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if (rthis->pending + len <= CONFIG_STREAM_OUT_BUFFER_SIZE)
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{
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/* If buffer is enough to save incoming data, cache it */
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memcpy(rthis->buffer + rthis->pending, buf, len);
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rthis->pending += len;
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}
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else
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{
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/* Or, for long data flush buffer and write it directly */
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ret = lib_stream_flush(this);
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if (ret >= 0)
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{
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ret = lib_stream_puts(rthis->backend, buf, len);
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}
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}
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return ret;
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}
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/****************************************************************************
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* Name: bufferedoutstream_putc
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****************************************************************************/
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static void bufferedoutstream_putc(FAR struct lib_outstream_s *this, int ch)
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{
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char c = ch;
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bufferedoutstream_puts(this, &c, 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_bufferedoutstream
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****************************************************************************/
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void lib_bufferedoutstream(FAR struct lib_bufferedoutstream_s *outstream,
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FAR struct lib_outstream_s *backend)
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{
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outstream->public.putc = bufferedoutstream_putc;
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outstream->public.puts = bufferedoutstream_puts;
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outstream->public.flush = bufferedoutstream_flush;
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outstream->public.nput = 0;
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outstream->backend = backend;
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outstream->pending = 0;
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}
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