118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
/****************************************************************************
|
|
* libs/libc/stream/lib_rawoutstream.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <unistd.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/fs/fs.h>
|
|
|
|
#include "libc.h"
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: rawsostream_putc
|
|
****************************************************************************/
|
|
|
|
static void rawsostream_putc(FAR struct lib_sostream_s *this, int ch)
|
|
{
|
|
FAR struct lib_rawsostream_s *rthis = (FAR struct lib_rawsostream_s *)this;
|
|
char buffer = ch;
|
|
int nwritten;
|
|
int errcode;
|
|
|
|
DEBUGASSERT(this && rthis->fd >= 0);
|
|
|
|
/* Loop until the character is successfully transferred or until an
|
|
* irrecoverable error occurs.
|
|
*/
|
|
|
|
do
|
|
{
|
|
nwritten = _NX_WRITE(rthis->fd, &buffer, 1);
|
|
if (nwritten == 1)
|
|
{
|
|
this->nput++;
|
|
return;
|
|
}
|
|
|
|
/* The only expected error is EINTR, meaning that the write operation
|
|
* was awakened by a signal. Zero would not be a valid return value
|
|
* from _NX_WRITE().
|
|
*/
|
|
|
|
errcode = _NX_GETERRNO(nwritten);
|
|
DEBUGASSERT(nwritten < 0);
|
|
}
|
|
while (errcode == EINTR);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: rawsostream_seek
|
|
****************************************************************************/
|
|
|
|
static off_t rawsostream_seek(FAR struct lib_sostream_s *this, off_t offset,
|
|
int whence)
|
|
{
|
|
FAR struct lib_rawsostream_s *mthis = (FAR struct lib_rawsostream_s *)this;
|
|
|
|
DEBUGASSERT(this);
|
|
return _NX_SEEK(mthis->fd, offset, whence);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: lib_rawsostream
|
|
*
|
|
* Description:
|
|
* Initializes a stream for use with a file descriptor.
|
|
*
|
|
* Input Parameters:
|
|
* outstream - User allocated, uninitialized instance of struct
|
|
* lib_rawsostream_s to be initialized.
|
|
* fd - User provided file/socket descriptor (must have been opened
|
|
* for write access).
|
|
*
|
|
* Returned Value:
|
|
* None (User allocated instance initialized).
|
|
*
|
|
****************************************************************************/
|
|
|
|
void lib_rawsostream(FAR struct lib_rawsostream_s *outstream, int fd)
|
|
{
|
|
outstream->public.put = rawsostream_putc;
|
|
outstream->public.flush = lib_snoflush;
|
|
outstream->public.seek = rawsostream_seek;
|
|
outstream->public.nput = 0;
|
|
outstream->fd = fd;
|
|
}
|