llvm-project

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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <__config>
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#ifndef _LIBCPP_HAS_NO_FILESYSTEM
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#  include <fstream>
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#endif
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#include <ostream>
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#include "std_stream.h"
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_LIBCPP_BEGIN_NAMESPACE_STD
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_LIBCPP_EXPORTED_FROM_ABI FILE* __get_ostream_file(ostream& __os) {
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  // dynamic_cast requires RTTI, this only affects users whose vendor builds
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  // the dylib with RTTI disabled. It does not affect users who build with RTTI
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  // disabled but use a dylib where the RTTI is enabled.
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  //
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  // Returning a nullptr means the stream is not considered a terminal and the
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  // special terminal handling is not done. The terminal handling is mainly of
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  // importance on Windows.
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#ifndef _LIBCPP_HAS_NO_RTTI
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  auto* __rdbuf = __os.rdbuf();
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#  ifndef _LIBCPP_HAS_NO_FILESYSTEM
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  if (auto* __buffer = dynamic_cast<filebuf*>(__rdbuf))
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    return __buffer->__file_;
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#  endif
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  if (auto* __buffer = dynamic_cast<__stdoutbuf<char>*>(__rdbuf))
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    return __buffer->__file_;
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#endif // _LIBCPP_HAS_NO_RTTI
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  return nullptr;
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}
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_LIBCPP_END_NAMESPACE_STD
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