libcxx/src/fstream.cpp

   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`
  25 static_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