b8e622ea5d
Return the error code when all gets occur when an error is wrong and return immediately when obtaining any valid data Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_stdsistream.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 <assert.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: stdsistream_getc
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****************************************************************************/
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static int stdsistream_getc(FAR struct lib_sistream_s *this)
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{
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FAR struct lib_stdsistream_s *sthis = (FAR struct lib_stdsistream_s *)this;
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int ret;
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DEBUGASSERT(this);
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/* Get the next character from the incoming stream */
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ret = getc(sthis->stream);
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if (ret != EOF)
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{
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this->nget++;
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}
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return ret;
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}
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/****************************************************************************
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* Name: stdsistream_gets
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****************************************************************************/
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static int stdsistream_gets(FAR struct lib_instream_s *this,
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FAR void *buffer, int len)
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{
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FAR struct lib_stdsistream_s *sthis = (FAR struct lib_stdsistream_s *)this;
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int nread = 0;
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DEBUGASSERT(this);
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/* Get the buffer from the incoming stream */
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nread = fread(buffer, len, 1, sthis->stream);
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if (nread >= 0)
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{
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this->nget += nread;
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}
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else
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{
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nread = _NX_GETERRVAL(nread);
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}
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return nread;
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}
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/****************************************************************************
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* Name: stdsistream_seek
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****************************************************************************/
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static off_t stdsistream_seek(FAR struct lib_sistream_s *this, off_t offset,
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int whence)
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{
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FAR struct lib_stdsistream_s *mthis = (FAR struct lib_stdsistream_s *)this;
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DEBUGASSERT(this);
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return fseek(mthis->stream, 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_stdsistream
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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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* instream - User allocated, uninitialized instance of struct
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* lib_stdsistream_s to be initialized.
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* stream - User provided stream instance (must have been opened for
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* read 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_stdsistream(FAR struct lib_stdsistream_s *instream,
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FAR FILE *stream)
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{
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instream->public.getc = stdsistream_getc;
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instream->public.gets = stdsistream_gets;
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instream->public.seek = stdsistream_seek;
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instream->public.nget = 0;
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instream->stream = stream;
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}
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