172 lines
5.3 KiB
C
172 lines
5.3 KiB
C
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/************************************************************
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* lib_fflush.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 Gregory Nutt 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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* Compilation Switches
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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> /* for CONFIG_STDIO_BUFFER_SIZE */
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#if CONFIG_NFILE_STREAMS > 0
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#include <stdio.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "lib_internal.h"
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/************************************************************
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* 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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* Global Functions
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************************************************************/
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/************************************************************
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* fflush
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************************************************************/
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/* Called by the OS when a task exits */
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void lib_flushall(struct streamlist *list)
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{
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/* Make sure that there are streams associated with this thread */
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if (list)
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{
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int i;
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/* Process each stream in the thread's stream list */
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stream_semtake(list);
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for (i = 0; i < CONFIG_NFILE_STREAMS; i++)
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{
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/* If the stream is open (i.e., assigned a non-
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* negative file descriptor), then flush the
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* stream.
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*/
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if (list->sl_streams[i].fs_filedes >= 0)
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{
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(void)fflush(&list->sl_streams[i]);
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}
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}
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stream_semgive(list);
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}
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}
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int fflush(FILE *stream)
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{
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#if CONFIG_STDIO_BUFFER_SIZE > 0
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const unsigned char *src;
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size_t bytes_written;
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size_t nbuffer;
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if (stream->fs_filedes < 0 || (stream->fs_oflags & O_WROK) == 0)
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{
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*get_errno_ptr() = EBADF;
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return ERROR;
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}
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/* How many bytes are used in the buffer now */
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nbuffer = stream->fs_bufpos - stream->fs_bufstart;
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/* Try to write that amount */
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src = stream->fs_bufstart;
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bytes_written = write(stream->fs_filedes, src, nbuffer);
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if (bytes_written < 0)
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{
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return bytes_written;
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}
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/* Update pointers and counts */
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src += bytes_written;
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nbuffer -= bytes_written;
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/* Reset the buffer position to the beginning of the buffer */
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stream->fs_bufpos = stream->fs_bufstart;
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/* For the case of an incomplete write, nbuffer will be non-zero
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* It will hold the number of bytes that were not written.
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* Move the data down in the buffer to handle this (rare) case
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*/
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while (nbuffer)
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{
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*stream->fs_bufpos++ = *src++;
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--nbuffer;
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}
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/* Return the number of bytes remaining in the buffer */
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return stream->fs_bufpos - stream->fs_bufstart;
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#else
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return 0;
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#endif
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}
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#endif /* CONFIG_NFILE_STREAMS */
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