138 lines
4.3 KiB
C
138 lines
4.3 KiB
C
/****************************************************************************
|
|
* libs/libc/stream/lib_rawsistream.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: rawsistream_getc
|
|
****************************************************************************/
|
|
|
|
static int rawsistream_getc(FAR struct lib_sistream_s *this)
|
|
{
|
|
FAR struct lib_rawsistream_s *rthis = (FAR struct lib_rawsistream_s *)this;
|
|
int nread;
|
|
char ch;
|
|
|
|
DEBUGASSERT(this && rthis->fd >= 0);
|
|
|
|
/* Attempt to read one character */
|
|
|
|
nread = _NX_READ(rthis->fd, &ch, 1);
|
|
if (nread == 1)
|
|
{
|
|
this->nget++;
|
|
return ch;
|
|
}
|
|
|
|
/* Return EOF on any failure to read from the incoming byte stream. The
|
|
* only expected error is EINTR meaning that the read was interrupted
|
|
* by a signal. A Zero return value would indicated an end-of-file
|
|
* confition.
|
|
*/
|
|
|
|
return EOF;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: rawsistream_gets
|
|
****************************************************************************/
|
|
|
|
static int rawsistream_gets(FAR struct lib_instream_s *this,
|
|
FAR void *buffer, int len)
|
|
{
|
|
FAR struct lib_rawsistream_s *rthis = (FAR struct lib_rawsistream_s *)this;
|
|
int nread;
|
|
|
|
DEBUGASSERT(this && rthis->fd >= 0);
|
|
|
|
/* Attempt to read a buffer */
|
|
|
|
nread = _NX_READ(rthis->fd, buffer, len);
|
|
if (nread >= 0)
|
|
{
|
|
this->nget += nread;
|
|
}
|
|
else
|
|
{
|
|
nread = _NX_GETERRVAL(nread);
|
|
}
|
|
|
|
return nread;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: rawsistream_seek
|
|
****************************************************************************/
|
|
|
|
static off_t rawsistream_seek(FAR struct lib_sistream_s *this, off_t offset,
|
|
int whence)
|
|
{
|
|
FAR struct lib_rawsistream_s *mthis = (FAR struct lib_rawsistream_s *)this;
|
|
|
|
DEBUGASSERT(this);
|
|
return _NX_SEEK(mthis->fd, offset, whence);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: lib_rawsistream
|
|
*
|
|
* Description:
|
|
* Initializes a stream for use with a file descriptor.
|
|
*
|
|
* Input Parameters:
|
|
* instream - User allocated, uninitialized instance of struct
|
|
* lib_rawsistream_s to be initialized.
|
|
* fd - User provided file/socket descriptor (must have been opened
|
|
* for the correct access).
|
|
*
|
|
* Returned Value:
|
|
* None (User allocated instance initialized).
|
|
*
|
|
****************************************************************************/
|
|
|
|
void lib_rawsistream(FAR struct lib_rawsistream_s *instream, int fd)
|
|
{
|
|
instream->public.getc = rawsistream_getc;
|
|
instream->public.gets = rawsistream_gets;
|
|
instream->public.seek = rawsistream_seek;
|
|
instream->public.nget = 0;
|
|
instream->fd = fd;
|
|
}
|