159 lines
5.0 KiB
C
159 lines
5.0 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_rawsostream.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: rawsostream_putc
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****************************************************************************/
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static void rawsostream_putc(FAR struct lib_sostream_s *self, int ch)
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{
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FAR struct lib_rawsostream_s *stream =
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(FAR struct lib_rawsostream_s *)self;
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char buffer = ch;
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int nwritten;
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DEBUGASSERT(self && stream->fd >= 0);
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/* Loop until the character is successfully transferred or until an
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* irrecoverable error occurs.
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*/
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do
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{
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nwritten = _NX_WRITE(stream->fd, &buffer, 1);
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if (nwritten == 1)
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{
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self->nput++;
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return;
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}
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/* The only expected error is EINTR, meaning that the write operation
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* was awakened by a signal. Zero would not be a valid return value
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* from _NX_WRITE().
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*/
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nwritten = _NX_GETERRVAL(nwritten);
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DEBUGASSERT(nwritten < 0);
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}
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while (nwritten == -EINTR);
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}
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/****************************************************************************
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* Name: rawsostream_puts
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****************************************************************************/
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static int rawsostream_puts(FAR struct lib_sostream_s *self,
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FAR const void *buffer, int len)
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{
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FAR struct lib_rawsostream_s *stream =
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(FAR struct lib_rawsostream_s *)self;
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int nwritten;
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DEBUGASSERT(self && stream->fd >= 0);
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/* Loop until the buffer is successfully transferred or until an
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* irrecoverable error occurs.
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*/
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do
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{
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nwritten = _NX_WRITE(stream->fd, buffer, len);
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if (nwritten >= 0)
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{
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self->nput += nwritten;
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return nwritten;
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}
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/* The only expected error is EINTR, meaning that the write operation
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* was awakened by a signal. Zero would not be a valid return value
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* from _NX_WRITE().
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*/
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nwritten = _NX_GETERRVAL(nwritten);
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DEBUGASSERT(nwritten < 0);
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}
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while (nwritten == -EINTR);
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return nwritten;
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}
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/****************************************************************************
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* Name: rawsostream_seek
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****************************************************************************/
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static off_t rawsostream_seek(FAR struct lib_sostream_s *self, off_t offset,
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int whence)
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{
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FAR struct lib_rawsostream_s *stream =
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(FAR struct lib_rawsostream_s *)self;
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DEBUGASSERT(self);
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return _NX_SEEK(stream->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_rawsostream
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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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* stream - User allocated, uninitialized instance of struct
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* lib_rawsostream_s to be initialized.
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* fd - User provided file/socket descriptor (must have been opened
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* for write 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_rawsostream(FAR struct lib_rawsostream_s *stream, int fd)
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{
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stream->common.putc = rawsostream_putc;
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stream->common.puts = rawsostream_puts;
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stream->common.flush = lib_snoflush;
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stream->common.seek = rawsostream_seek;
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stream->common.nput = 0;
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stream->fd = fd;
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}
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