forked from Archive/PX4-Autopilot
135 lines
4.8 KiB
C
135 lines
4.8 KiB
C
/****************************************************************************
|
|
* lib/stdio/lib_wrflush.c
|
|
*
|
|
* Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
|
|
#include "lib_internal.h"
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Type Declarations
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Global Constant Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Global Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Constant Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Variables
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: lib_wrflush
|
|
*
|
|
* Description:
|
|
* This is simply a version of fflush that does not report an error if
|
|
* the file is not open for writing.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int lib_wrflush(FAR FILE *stream)
|
|
{
|
|
#if CONFIG_STDIO_BUFFER_SIZE > 0
|
|
/* Verify that we were passed a valid (i.e., non-NULL) stream */
|
|
|
|
#ifdef CONFIG_DEBUG
|
|
if (!stream)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/* Verify that the stream is opened for writing... lib_fflush will
|
|
* return an error if it is called for a stream that is not opened for
|
|
* writing. Check that first so that this function will not fail in
|
|
* that case.
|
|
*/
|
|
|
|
if ((stream->fs_oflags & O_WROK) == 0)
|
|
{
|
|
/* Report that the success was successful if we attempt to flush a
|
|
* read-only stream.
|
|
*/
|
|
|
|
return OK;
|
|
}
|
|
|
|
/* Flush the stream. Return success if there is no buffered write data
|
|
* -- i.e., that the stream is opened for writing and that all of the
|
|
* buffered write data was successfully flushed by lib_fflush().
|
|
*/
|
|
|
|
return lib_fflush(stream, true);
|
|
#else
|
|
/* Verify that we were passed a valid (i.e., non-NULL) stream */
|
|
|
|
#ifdef CONFIG_DEBUG
|
|
if (!stream)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
return OK;
|
|
#endif
|
|
}
|