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#include <cstdio>
11#include <fstream>
12
13#if defined(_LIBCPP_WIN32API)
14#  define WIN32_LEAN_AND_MEAN
15#  define NOMINMAX
16#  include <io.h>
17#  include <windows.h>
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21
22#if defined(_LIBCPP_WIN32API)
23
24// Confirm that `HANDLE` is `void*` as implemented in `basic_filebuf`
25static_assert(std::same_as<HANDLE, void*>);
26
27_LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept {
28  // https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/get-osfhandle?view=msvc-170
29  intptr_t __handle = _get_osfhandle(fileno(__file));
30  if (__handle == -1)
31    return nullptr;
32  return reinterpret_cast<void*>(__handle);
33}
34
35#endif
36
37_LIBCPP_END_NAMESPACE_STD