incubator-nuttx/libs/libc/stream/lib_stdinstream.c

116 lines
3.6 KiB
C

/****************************************************************************
* libs/libc/stream/lib_stdinstream.c
*
* SPDX-License-Identifier: Apache-2.0
*
* 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 <assert.h>
#include <stdio.h>
#include "libc.h"
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stdinstream_getc
****************************************************************************/
static int stdinstream_getc(FAR struct lib_instream_s *self)
{
FAR struct lib_stdinstream_s *stream =
(FAR struct lib_stdinstream_s *)self;
int ret;
DEBUGASSERT(self);
/* Get the next character from the incoming stream */
ret = getc(stream->handle);
if (ret != EOF)
{
self->nget++;
}
return ret;
}
/****************************************************************************
* Name: stdinstream_gets
****************************************************************************/
static int stdinstream_gets(FAR struct lib_instream_s *self,
FAR void *buffer, int len)
{
FAR struct lib_stdinstream_s *stream =
(FAR struct lib_stdinstream_s *)self;
int nread = 0;
DEBUGASSERT(self);
/* Get the buffer from the incoming stream handle */
nread = fread(buffer, len, 1, stream->handle);
if (nread >= 0)
{
self->nget += nread;
}
else
{
nread = _NX_GETERRVAL(nread);
}
return nread;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lib_stdinstream
*
* Description:
* Initializes a stream for use with a FILE instance.
*
* Input Parameters:
* instream - User allocated, uninitialized instance of struct
* lib_stdinstream_s to be initialized.
* handle - User provided handle instance (must have been opened for
* read access).
*
* Returned Value:
* None (User allocated instance initialized).
*
****************************************************************************/
void lib_stdinstream(FAR struct lib_stdinstream_s *stream,
FAR FILE *handle)
{
stream->common.getc = stdinstream_getc;
stream->common.gets = stdinstream_gets;
stream->common.nget = 0;
stream->handle = handle;
}