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