/* glpenv08.c (shared library support) */

/***********************************************************************

*  This code is part of GLPK (GNU Linear Programming Kit).

*

*  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,

*  2009, 2010 Andrew Makhorin, Department for Applied Informatics,

*  Moscow Aviation Institute, Moscow, Russia. All rights reserved.

*  E-mail: <mao@gnu.org>.

*

*  GLPK 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, either version 3 of the License, or

*  (at your option) any later version.

*

*  GLPK 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 GLPK. If not, see <http://www.gnu.org/licenses/>.

***********************************************************************/

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include "glpenv.h"

/* GNU version ********************************************************/

#if defined(HAVE_LTDL)

#include <ltdl.h>

void *xdlopen(const char *module)

{     void *h = NULL;

      if (lt_dlinit() != 0)

      {  lib_err_msg(lt_dlerror());

         goto done;

      }

      h = lt_dlopen(module);

      if (h == NULL)

      {  lib_err_msg(lt_dlerror());

         if (lt_dlexit() != 0)

            xerror("xdlopen: %s\n", lt_dlerror());

      }

done: return h;

}

void *xdlsym(void *h, const char *symbol)

{     void *ptr;

      xassert(h != NULL);

      ptr = lt_dlsym(h, symbol);

      if (ptr == NULL)

         xerror("xdlsym: %s: %s\n", symbol, lt_dlerror());

      return ptr;

}

void xdlclose(void *h)

{     xassert(h != NULL);

      if (lt_dlclose(h) != 0)

         xerror("xdlclose: %s\n", lt_dlerror());

      if (lt_dlexit() != 0)

         xerror("xdlclose: %s\n", lt_dlerror());

      return;

}

/* POSIX version ******************************************************/

#elif defined(HAVE_DLFCN)

#include <dlfcn.h>

void *xdlopen(const char *module)

{     void *h;

      h = dlopen(module, RTLD_NOW);

      if (h == NULL)

         lib_err_msg(dlerror());

      return h;

}

void *xdlsym(void *h, const char *symbol)

{     void *ptr;

      xassert(h != NULL);

      ptr = dlsym(h, symbol);

      if (ptr == NULL)

         xerror("xdlsym: %s: %s\n", symbol, dlerror());

      return ptr;

}

void xdlclose(void *h)

{     xassert(h != NULL);

      if (dlclose(h) != 0)

         xerror("xdlclose: %s\n", dlerror());

      return;

}

/* Windows version ****************************************************/

#elif defined(__WOE__)

#include <windows.h>

void *xdlopen(const char *module)

{     void *h;

      h = LoadLibrary(module);

      if (h == NULL)

      {  char msg[20];

         sprintf(msg, "Error %d", GetLastError());

         lib_err_msg(msg);

      }

      return h;

}

void *xdlsym(void *h, const char *symbol)

{     void *ptr;

      xassert(h != NULL);

      ptr = GetProcAddress(h, symbol);

      if (ptr == NULL)

         xerror("xdlsym: %s: Error %d\n", symbol, GetLastError());

      return ptr;

}

void xdlclose(void *h)

{     xassert(h != NULL);

      if (!FreeLibrary(h))

         xerror("xdlclose: Error %d\n", GetLastError());

      return;

}

/* NULL version *******************************************************/

#else

void *xdlopen(const char *module)

{     xassert(module == module);

      lib_err_msg("Shared libraries not supported");

      return NULL;

}

void *xdlsym(void *h, const char *symbol)

{     xassert(h != h);

      xassert(symbol != symbol);

      return NULL;

}

void xdlclose(void *h)

{     xassert(h != h);

      return;

}

#endif

/* eof */