129 lines
4.6 KiB
C
129 lines
4.6 KiB
C
/****************************************************************************
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* libc/stdio/lib_rawsostream.c
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*
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* Copyright (C) 2014 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 <unistd.h>
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#include <assert.h>
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#include <errno.h>
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#include "lib_internal.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: rawsostream_putc
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****************************************************************************/
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static void rawsostream_putc(FAR struct lib_sostream_s *this, int ch)
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{
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FAR struct lib_rawsostream_s *rthis = (FAR struct lib_rawsostream_s *)this;
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int nwritten;
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char buffer = ch;
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DEBUGASSERT(this && rthis->fd >= 0);
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/* Loop until the character is successfully transferred or until an
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* irrecoverable error occurs.
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*/
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do
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{
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nwritten = write(rthis->fd, &buffer, 1);
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if (nwritten == 1)
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{
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this->nput++;
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return;
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}
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/* The only expected error is EINTR, meaning that the write operation
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* was awakened by a signal. Zero would not be a valid return value
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* from write().
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*/
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DEBUGASSERT(nwritten < 0);
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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: rawsostream_seek
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****************************************************************************/
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static off_t rawsostream_seek(FAR struct lib_sostream_s *this, off_t offset,
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int whence)
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{
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FAR struct lib_rawsostream_s *mthis = (FAR struct lib_rawsostream_s *)this;
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DEBUGASSERT(this);
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return lseek(mthis->fd, offset, whence);
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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_rawsostream
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*
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* Description:
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* Initializes a stream for use with a file descriptor.
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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_rawsostream_s to be initialized.
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* fd - User provided file/socket descriptor (must have been opened
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* for 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_rawsostream(FAR struct lib_rawsostream_s *outstream, int fd)
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{
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outstream->public.put = rawsostream_putc;
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#ifdef CONFIG_STDIO_LINEBUFFER
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outstream->public.flush = lib_snoflush;
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#endif
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outstream->public.seek = rawsostream_seek;
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outstream->public.nput = 0;
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outstream->fd = fd;
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}
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