text: //
  //  Upcaste Performance Libraries
  //  Copyright (C) 2012-2013 Jesse W. Towner
  //
  //  Permission is hereby granted, free of charge, to any person obtaining
  //  a copy of this software and associated documentation files (the
  //  "Software"), to deal in the Software without restriction, including
  //  without limitation the rights to use, copy, modify, merge, publish,
  //  distribute, sublicense, and/or sell copies of the Software, and to
  //  permit persons to whom the Software is furnished to do so, subject to
  //  the following conditions:
  //
  //  The above copyright notice and this permission notice shall be
  //  included in all copies or substantial portions of the Software.
  //
  //  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  //  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  //  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  //  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  //  CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  //  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  //  SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  
  #include <up/cerrno.hpp>
  
  #define WIN32_LEAN_AND_MEAN
  #include <Windows.h>
  
  namespace up
  {
      LIBUPCOREAPI UPPURE
      int hresult_to_errno(long result) noexcept {
          if (SUCCEEDED(result)) {
              return 0;
          }
          
          if (HRESULT_FACILITY(result) == FACILITY_ITF) {
              return EACCES;
          }
  
          switch (result) {
          case E_NOTIMPL: return ENOSYS;
          case E_NOINTERFACE: return ENOENT;
          case E_POINTER: return EFAULT;
          case E_ABORT: return ECANCELED;
          case E_FAIL: return EACCES;
          case E_UNEXPECTED: return EACCES;
          case E_ACCESSDENIED: return EACCES;
          case E_HANDLE: return EFAULT;
          case E_OUTOFMEMORY: return ENOMEM;
          case E_INVALIDARG: return EINVAL;
          default: break;
          }
  
          return oserror_to_errno(static_cast<unsigned long>(HRESULT_CODE(result)));
      }
  }
  