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
42