133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_stdoutstream.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <fcntl.h>
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#include <assert.h>
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#include <errno.h>
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#include "libc.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stdoutstream_putc
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****************************************************************************/
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static void stdoutstream_putc(FAR struct lib_outstream_s *this, int ch)
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{
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FAR struct lib_stdoutstream_s *sthis =
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(FAR struct lib_stdoutstream_s *)this;
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int result;
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DEBUGASSERT(this && sthis->stream);
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/* Loop until the character is successfully transferred or an irrecoverable
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* error occurs.
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*/
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do
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{
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result = fputc(ch, sthis->stream);
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if (result != EOF)
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{
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this->nput++;
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return;
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}
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/* EINTR (meaning that fputc was interrupted by a signal) is the only
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* recoverable error.
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*/
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}
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while (get_errno() == EINTR);
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}
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/****************************************************************************
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* Name: stdoutstream_flush
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****************************************************************************/
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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static int stdoutstream_flush(FAR struct lib_outstream_s *this)
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{
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FAR struct lib_stdoutstream_s *sthis =
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(FAR struct lib_stdoutstream_s *)this;
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DEBUGASSERT(sthis != NULL && sthis->stream != NULL);
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return lib_fflush(sthis->stream, true);
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_stdoutstream
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*
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* Description:
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* Initializes a stream for use with a FILE instance.
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*
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* Input Parameters:
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* outstream - User allocated, uninitialized instance of struct
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* lib_stdoutstream_s to be initialized.
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* stream - User provided stream instance (must have been opened for
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* write access).
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*
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* Returned Value:
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* None (User allocated instance initialized).
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*
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****************************************************************************/
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void lib_stdoutstream(FAR struct lib_stdoutstream_s *outstream,
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FAR FILE *stream)
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{
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/* Select the put operation */
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outstream->public.put = stdoutstream_putc;
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/* Select the correct flush operation. This flush is only called when
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* a newline is encountered in the output stream. However, we do not
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* want to support this line buffering behavior if the stream was
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* opened in binary mode. In binary mode, the newline has no special
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* meaning.
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*/
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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if (stream->fs_bufstart != NULL && (stream->fs_oflags & O_BINARY) == 0)
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{
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outstream->public.flush = stdoutstream_flush;
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}
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else
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#endif
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{
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outstream->public.flush = lib_noflush;
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}
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/* Set the number of bytes put to zero and remember the stream */
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outstream->public.nput = 0;
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outstream->stream = stream;
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}
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