libmain.cpp

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// libdoomwad: manipulates Doom wad files.
// Copyright (C) 2005  John Gaughan
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// This library is distributed with the full text of the LGPL. Please see
// the accompanying file named COPYING.
// 
// You may contact the author at john@johngaughan.net

// C++ required.
#if !defined __cplusplus
#error C++ compiler required
#endif

// Windows header
#if defined WINDOWS
#include <windows.h>
#endif

// Standard headers
#include <iostream>

// Doom headers
#include "global.hpp"
#include "eventlog.hpp"
#include "libmain.hpp"

// This is the cool part. Since Linux uses separate functions instead of one
// with a parameter, I can use the same functions to initialize both versions
// of the library. Most of libdoomwad is OS-independent, so the only thing to
// worry about is how to get into the library.

void _init (void)
{

  // Log errors to stderr.
  Doomwad::EventLog::setStream (&std::cerr);
}

void _fini (void)
{

  // Detach error log from stream to avoid possible dangling pointer issues as
  // this library and libstdc++ both try to unload.
  Doomwad::EventLog::setStream (NULL);
}

#if defined WINDOWS

EXPORT int WINAPI DllMain (HINSTANCE instance, DWORD reason, PVOID reserved)
{

  // Shut up the compiler about unused variable warnings.
  instance = NULL;
  reserved = NULL;

  // Only care about attaching/detaching to/from processes. Thread stuff does
  // not matter because there is no per-thread crap to worry about here.
  switch (reason)
  {
    case DLL_PROCESS_ATTACH:
      _init ();
      break;
    case DLL_PROCESS_DETACH:
      _fini ();
      break;
    default:
      break;
  }
  return 1;
}
#endif

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