149 lines
4.7 KiB
C
149 lines
4.7 KiB
C
/****************************************************************************
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* libs/libc/stream/lib_fileoutstream.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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: rawoutstream_puts
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****************************************************************************/
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static ssize_t fileoutstream_puts(FAR struct lib_outstream_s *self,
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FAR const void *buf, size_t len)
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{
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FAR struct lib_fileoutstream_s *stream =
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(FAR struct lib_fileoutstream_s *)self;
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ssize_t nwritten;
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do
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{
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nwritten = file_write(&stream->file, buf, 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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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: rawoutstream_putc
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****************************************************************************/
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static void fileoutstream_putc(FAR struct lib_outstream_s *self, int ch)
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{
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char tmp = ch;
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fileoutstream_puts(self, &tmp, 1);
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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_fileoutstream_open
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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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* This function sets up the stream structure to enable writing to a file
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* specified by the provide path. It initializes the necessary function
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* pointers for character and string output, as well as the flush behavior.
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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_rawoutstream_s to be initialized.
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* path - Path to file to open.
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* oflag - Open flags.
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* mode - Mode flags.
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*
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* Returned Value:
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* 0 on success, negative error code in failuer.
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*
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****************************************************************************/
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int lib_fileoutstream_open(FAR struct lib_fileoutstream_s *stream,
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FAR const char *path, int oflag, mode_t mode)
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{
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int ret;
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ret = file_open(&stream->file, path, oflag, mode);
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if (ret < 0)
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{
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return ret;
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}
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stream->common.putc = fileoutstream_putc;
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stream->common.puts = fileoutstream_puts;
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stream->common.flush = lib_noflush;
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stream->common.nput = 0;
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return 0;
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}
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/****************************************************************************
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* Name: lib_fileoutstream_close
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*
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* Description:
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* Closes the file associated with the stream.
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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_rawoutstream_s to be initialized.
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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_fileoutstream_close(FAR struct lib_fileoutstream_s *stream)
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{
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if (stream != NULL)
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{
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file_close(&stream->file);
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stream->common.nput = 0;
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}
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}
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