71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/****************************************************************************
|
|
* libs/libc/stdio/lib_fread.c
|
|
*
|
|
* 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 <nuttx/config.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
|
|
#include "libc.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: fread
|
|
****************************************************************************/
|
|
|
|
size_t fread_unlocked(FAR void *ptr, size_t size,
|
|
size_t n_items, FAR FILE *stream)
|
|
{
|
|
size_t full_size = n_items * (size_t)size;
|
|
ssize_t bytes_read;
|
|
size_t items_read = 0;
|
|
|
|
/* Write the data into the stream buffer */
|
|
|
|
bytes_read = lib_fread_unlocked(ptr, full_size, stream);
|
|
if (bytes_read > 0)
|
|
{
|
|
/* Return the number of full items read */
|
|
|
|
items_read = bytes_read / size;
|
|
}
|
|
|
|
return items_read;
|
|
}
|
|
|
|
size_t fread(FAR void *ptr, size_t size, size_t n_items, FAR FILE *stream)
|
|
{
|
|
size_t ret;
|
|
|
|
flockfile(stream);
|
|
ret = fread_unlocked(ptr, size, n_items, stream);
|
|
funlockfile(stream);
|
|
|
|
return ret;
|
|
}
|
|
|