110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_rawsistream.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 <nuttx/config.h>
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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 <nuttx/fs/fs.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: rawsistream_getc
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****************************************************************************/
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static int rawsistream_getc(FAR struct lib_sistream_s *this)
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{
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FAR struct lib_rawsistream_s *rthis = (FAR struct lib_rawsistream_s *)this;
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int nread;
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char ch;
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DEBUGASSERT(this && rthis->fd >= 0);
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/* Attempt to read one character */
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nread = _NX_READ(rthis->fd, &ch, 1);
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if (nread == 1)
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{
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this->nget++;
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return ch;
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}
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/* Return EOF on any failure to read from the incoming byte stream. The
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* only expected error is EINTR meaning that the read was interrupted
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* by a signal. A Zero return value would indicated an end-of-file
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* confition.
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*/
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return EOF;
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}
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/****************************************************************************
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* Name: rawsistream_seek
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****************************************************************************/
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static off_t rawsistream_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_rawsistream_s *mthis = (FAR struct lib_rawsistream_s *)this;
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DEBUGASSERT(this);
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return _NX_SEEK(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_rawsistream
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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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* instream - User allocated, uninitialized instance of struct
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* lib_rawsistream_s to be initialized.
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* fd - User provided file/socket descriptor (must have been opened
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* for the correct 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_rawsistream(FAR struct lib_rawsistream_s *instream, int fd)
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{
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instream->public.get = rawsistream_getc;
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instream->public.seek = rawsistream_seek;
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instream->public.nget = 0;
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instream->fd = fd;
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}
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