b96035885a
Improve performance for raw fd based printf like operation. Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
65 lines
2.7 KiB
C
65 lines
2.7 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_vdprintf.c
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*
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* Copyright (C) 2012 Andrew Tridgell. All rights reserved.
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* Authors: Andrew Tridgell <andrew@tridgell.net>
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* 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 <nuttx/config.h>
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#include <stdio.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int vdprintf(int fd, FAR const IPTR char *fmt, va_list ap)
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{
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int ret;
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struct lib_rawoutstream_s rawoutstream;
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struct lib_bufferedoutstream_s outstream;
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/* Wrap the fd in a stream object and let lib_vsprintf do the work. */
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lib_rawoutstream(&rawoutstream, fd);
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lib_bufferedoutstream(&outstream, &rawoutstream.public);
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ret = lib_vsprintf(&outstream.public, fmt, ap);
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lib_stream_flush(&outstream.public);
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return ret;
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}
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