d1d46335df
Signed-off-by: anjiahao <anjiahao@xiaomi.com> Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/****************************************************************************
|
|
* libs/libc/stdio/lib_vfscanf.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 <stdio.h>
|
|
|
|
#include <nuttx/streams.h>
|
|
|
|
#include "libc.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: vfscanf
|
|
****************************************************************************/
|
|
|
|
int vfscanf(FAR FILE *stream, FAR const IPTR char *fmt, va_list ap)
|
|
{
|
|
struct lib_stdinstream_s stdinstream;
|
|
int n = ERROR;
|
|
int lastc;
|
|
|
|
if (stream)
|
|
{
|
|
/* Wrap the stream in a stream object and let lib_vscanf do the work. */
|
|
|
|
lib_stdinstream(&stdinstream, stream);
|
|
|
|
/* Hold the stream semaphore throughout the lib_vscanf call so that
|
|
* this thread can get its entire message out before being pre-empted
|
|
* by the next thread.
|
|
*/
|
|
|
|
lib_take_lock(stream);
|
|
|
|
n = lib_vscanf(&stdinstream.public, &lastc, fmt, ap);
|
|
|
|
/* The lib_vscanf function reads always one character more, this
|
|
* character needs to be written back.
|
|
*/
|
|
|
|
if (lastc != EOF)
|
|
{
|
|
ungetc(lastc, stream);
|
|
}
|
|
|
|
lib_give_lock(stream);
|
|
}
|
|
|
|
return n;
|
|
}
|