1//===----------------------------------------------------------------------===//
 2//
 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 4// See https://llvm.org/LICENSE.txt for license information.
 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 6//
 7//===----------------------------------------------------------------------===//
 8
 9#include <__config>
10#if _LIBCPP_HAS_FILESYSTEM
11#  include <fstream>
12#endif
13#include <ostream>
14
15#include "std_stream.h"
16
17_LIBCPP_BEGIN_NAMESPACE_STD
18
19_LIBCPP_EXPORTED_FROM_ABI FILE* __get_ostream_file(ostream& __os) {
20  // dynamic_cast requires RTTI, this only affects users whose vendor builds
21  // the dylib with RTTI disabled. It does not affect users who build with RTTI
22  // disabled but use a dylib where the RTTI is enabled.
23  //
24  // Returning a nullptr means the stream is not considered a terminal and the
25  // special terminal handling is not done. The terminal handling is mainly of
26  // importance on Windows.
27#if _LIBCPP_HAS_RTTI
28  auto* __rdbuf = __os.rdbuf();
29#  if _LIBCPP_HAS_FILESYSTEM
30  if (auto* __buffer = dynamic_cast<filebuf*>(__rdbuf))
31    return __buffer->__file_;
32#  endif
33
34  if (auto* __buffer = dynamic_cast<__stdoutbuf<char>*>(__rdbuf))
35    return __buffer->__file_;
36#endif // _LIBCPP_HAS_RTTI
37
38  return nullptr;
39}
40
41_LIBCPP_END_NAMESPACE_STD