/*
   Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */

#ifndef MY_SHAREDLIB_INCLUDED
#define MY_SHAREDLIB_INCLUDED

/**
  @file include/my_sharedlib.h
  Functions related to handling of plugins and other dynamically loaded
  libraries.
*/

#if defined(_WIN32)
#define dlsym(lib, name) (void*)GetProcAddress((HMODULE)lib, name)
#define dlopen(libname, unused) LoadLibraryEx(libname, NULL, 0)
#define dlclose(lib) FreeLibrary((HMODULE)lib)
#define DLERROR_GENERATE(errmsg, error_number) \
  char win_errormsg[2048]; \
  if(FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, \
                   0, error_number, 0, win_errormsg, 2048, NULL)) \
  { \
    char *ptr; \
    for (ptr= &win_errormsg[0] + strlen(win_errormsg) - 1; \
         ptr >= &win_errormsg[0] && strchr("\r\n\t\0x20", *ptr); \
         ptr--) \
      *ptr= 0; \
    errmsg= win_errormsg; \
  } \
  else \
    errmsg= ""
#define dlerror() ""
#define dlopen_errno GetLastError()

#else /* _WIN32 */

#ifndef MYSQL_ABI_CHECK
#include <dlfcn.h>
#include <errno.h>
#endif

#define DLERROR_GENERATE(errmsg, error_number) errmsg= dlerror()
#define dlopen_errno errno
#endif /* _WIN32 */

/* 
  MYSQL_PLUGIN_IMPORT macro is used to export mysqld data
  (i.e variables) for usage in storage engine loadable plugins.
  Outside of Windows, it is dummy.
*/
#if (defined(_WIN32) && defined(MYSQL_DYNAMIC_PLUGIN))
#define MYSQL_PLUGIN_IMPORT __declspec(dllimport)
#else
#define MYSQL_PLUGIN_IMPORT
#endif

#endif  // MY_SHAREDLIB_INCLUDED
