86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
|
/****************************************************************************
|
||
|
|
* libs/libc/stdio/lib_vfscanf.c
|
||
|
|
*
|
||
|
|
* Copyright (C) 2019 Gregory Nutt. All rights reserved.
|
||
|
|
* Author: Johannes Shock
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
*
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in
|
||
|
|
* the documentation and/or other materials provided with the
|
||
|
|
* distribution.
|
||
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
||
|
|
* used to endorse or promote products derived from this software
|
||
|
|
* without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Included Files
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
#include <nuttx/config.h>
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <semaphore.h>
|
||
|
|
|
||
|
|
#include "libc.h"
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* Public Functions
|
||
|
|
****************************************************************************/
|
||
|
|
|
||
|
|
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_vsscanf do the work. */
|
||
|
|
|
||
|
|
lib_stdinstream(&stdinstream, stream);
|
||
|
|
|
||
|
|
/* Hold the stream semaphore throughout the lib_vsscanf call so that
|
||
|
|
* this thread can get its entire message out before being pre-empted by
|
||
|
|
* the next thread.
|
||
|
|
*/
|
||
|
|
|
||
|
|
lib_take_semaphore(stream);
|
||
|
|
|
||
|
|
n = lib_vsscanf(&stdinstream.public, &lastc, fmt, ap);
|
||
|
|
|
||
|
|
/* The lib_vsscanf function reads always one character more, this
|
||
|
|
* character needs to be written back.
|
||
|
|
*/
|
||
|
|
|
||
|
|
if (lastc != EOF)
|
||
|
|
{
|
||
|
|
ungetc(lastc, stream);
|
||
|
|
}
|
||
|
|
|
||
|
|
lib_give_semaphore(stream);
|
||
|
|
}
|
||
|
|
|
||
|
|
return n;
|
||
|
|
}
|