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/****************************************************************************
* libc/stdio/lib_stdoutstream.c
*
* Copyright (C) 2007-2009, 2011-2012, 2014 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 <fcntl.h>
#include <assert.h>
#include <errno.h>
#include "lib_internal.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stdoutstream_putc
****************************************************************************/
static void stdoutstream_putc(FAR struct lib_outstream_s *this, int ch)
{
FAR struct lib_stdoutstream_s *sthis = (FAR struct lib_stdoutstream_s *)this;
int result;
DEBUGASSERT(this && sthis->stream);
/* Loop until the character is successfully transferred or an irrecoverable
* error occurs.
*/
do
{
result = fputc(ch, sthis->stream);
if (result != EOF)
{
this->nput++;
return;
}
/* EINTR (meaning that fputc was interrupted by a signal) is the only
* recoverable error.
*/
}
while (get_errno() == EINTR);
}
/****************************************************************************
* Name: stdoutstream_flush
****************************************************************************/
#if defined(CONFIG_STDIO_LINEBUFFER) && CONFIG_STDIO_BUFFER_SIZE > 0
static int stdoutstream_flush(FAR struct lib_outstream_s *this)
{
FAR struct lib_stdoutstream_s *sthis = (FAR struct lib_stdoutstream_s *)this;
return lib_fflush(sthis->stream, true);
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lib_stdoutstream
*
* Description:
* Initializes a stream for use with a FILE instance.
*
* Input parameters:
* outstream - User allocated, uninitialized instance of struct
* lib_stdoutstream_s to be initialized.
* stream - User provided stream instance (must have been opened for
* write access).
*
* Returned Value:
* None (User allocated instance initialized).
*
****************************************************************************/
void lib_stdoutstream(FAR struct lib_stdoutstream_s *outstream,
FAR FILE *stream)
{
/* Select the put operation */
outstream->public.put = stdoutstream_putc;
/* Select the correct flush operation. This flush is only called when
* a newline is encountered in the output stream. However, we do not
* want to support this line buffering behavior if the stream was
* opened in binary mode. In binary mode, the newline has no special
* meaning.
*/
#ifdef CONFIG_STDIO_LINEBUFFER
#if CONFIG_STDIO_BUFFER_SIZE > 0
if ((stream->fs_oflags & O_BINARY) == 0)
{
outstream->public.flush = stdoutstream_flush;
}
else
#endif
{
outstream->public.flush = lib_noflush;
}
#endif
/* Set the number of bytes put to zero and remember the stream */
outstream->public.nput = 0;
outstream->stream = stream;
}
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