135 lines
4.8 KiB
C
135 lines
4.8 KiB
C
/****************************************************************************
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* lib/stdio/lib_wrflush.c
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*
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* Copyright (C) 2008-2009, 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 <nuttx/config.h>
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#include <stdbool.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "lib_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Global Constant Data
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****************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/****************************************************************************
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* Private Constant Data
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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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_wrflush
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*
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* Description:
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* This is simply a version of fflush that does not report an error if
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* the file is not open for writing.
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*
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****************************************************************************/
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int lib_wrflush(FAR FILE *stream)
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{
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#if CONFIG_STDIO_BUFFER_SIZE > 0
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/* Verify that we were passed a valid (i.e., non-NULL) stream */
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#ifdef CONFIG_DEBUG
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if (!stream)
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{
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return -EINVAL;
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}
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#endif
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/* Verify that the stream is opened for writing... lib_fflush will
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* return an error if it is called for a stream that is not opened for
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* writing. Check that first so that this function will not fail in
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* that case.
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*/
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if ((stream->fs_oflags & O_WROK) == 0)
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{
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/* Report that the success was successful if we attempt to flush a
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* read-only stream.
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*/
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return OK;
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}
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/* Flush the stream. Return success if there is no buffered write data
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* -- i.e., that the stream is opened for writing and that all of the
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* buffered write data was successfully flushed by lib_fflush().
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*/
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return lib_fflush(stream, true);
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#else
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/* Verify that we were passed a valid (i.e., non-NULL) stream */
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#ifdef CONFIG_DEBUG
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if (!stream)
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{
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return -EINVAL;
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}
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#endif
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return OK;
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#endif
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}
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