4935ab5243
This backs out a part of PR 1179 which has a very serious error: If C buffered I/O is available, then printf() and vprintf MUST use it. Otherwise, the ordering of the I/O will be screwed up. They must not use direct file descriptor I/O UNLESS C buffered I/O is disabled.
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_printf.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 <stdio.h>
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#include <stdarg.h>
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#include <unistd.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: printf
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****************************************************************************/
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int printf(FAR const IPTR char *fmt, ...)
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{
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va_list ap;
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int ret;
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va_start(ap, fmt);
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#if CONFIG_NFILE_STREAMS > 0
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ret = vfprintf(stdout, fmt, ap);
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#else
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ret = vdprintf(STDOUT_FILENO, fmt, ap);
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#endif
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va_end(ap);
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return ret;
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}
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