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134 lines
4.8 KiB
134 lines
4.8 KiB
/**************************************************************************** |
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* libc/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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