/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 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

    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public

    License along with this library; if not, write to the Free

    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#ifdef SAVE_RCSID

static char rcsid =

 "@(#) $Id$";

#endif

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

/* System dependent library loading routines                           */

#include <stdio.h>

#if defined(USE_DLOPEN)

# include <dlfcn.h>

#elif defined(WIN32)

# include <windows.h>

#elif defined(__BEOS__)

# include <be/kernel/image.h>

#elif defined(macintosh)

# include <string.h>

# include <Strings.h>

# include <CodeFragments.h>

# include <Errors.h>

#else

/*#error Unsupported dynamic link environment*/

#endif /* system type */

#include "SDL_types.h"

#include "SDL_error.h"

#include "SDL_loadso.h"

void *SDL_LoadObject(const char *sofile)

{

	void *handle = NULL;

	const char *loaderror = "SDL_LoadObject() not implemented";

#if defined(USE_DLOPEN)

/* * */

	handle = dlopen(sofile, RTLD_NOW);

	loaderror = (char *)dlerror();

#elif defined(WIN32)

/* * */

	char errbuf[512];

	handle = (void *)LoadLibrary(sofile);

	/* Generate an error message if all loads failed */

	if ( handle == NULL ) {

		FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |

					FORMAT_MESSAGE_FROM_SYSTEM),

				NULL, GetLastError(), 

				MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

				errbuf, SDL_TABLESIZE(errbuf), NULL);

		loaderror = errbuf;

	}

#elif defined(__BEOS__)

/* * */

	image_id library_id;

	library_id = load_add_on(sofile);

	if ( library_id == B_ERROR ) {

		loaderror = "BeOS error";

	} else {

		handle = (void *)(library_id);

	}

#elif defined(macintosh)

/* * */

	CFragConnectionID library_id;

	Ptr mainAddr;

	Str255 errName;

	OSErr error;

	char psofile[512];

	strncpy(psofile, sofile, SDL_TABLESIZE(psofile));

	psofile[SDL_TABLESIZE(psofile)-1] = '\0';

	error = GetSharedLibrary(C2PStr(psofile), kCompiledCFragArch,

			kLoadCFrag, &library_id, &mainAddr, errName);

	switch (error) {

		case noErr:

			break;

		case cfragNoLibraryErr:

			loaderror = "Library not found";

			break;

		case cfragUnresolvedErr:

			loaderror = "Unabled to resolve symbols";

			break;

		case cfragNoPrivateMemErr:

		case cfragNoClientMemErr:

			loaderror = "Out of memory";

			break;

		default:

			loaderror = "Unknown Code Fragment Manager error";

			break;

	}

	if ( loaderror == NULL ) {

		handle = (void *)(library_id);

	}

#endif /* system type */

	if ( handle == NULL ) {

		SDL_SetError("Failed loading %s: %s", sofile, loaderror);

	}

	return(handle);

}

void *SDL_LoadFunction(void *handle, const char *name)

{

	void *symbol = NULL;

	const char *loaderror = "SDL_LoadFunction not implemented";

#if defined(USE_DLOPEN)

/* * */

	symbol = dlsym(handle, name);

	if ( symbol == NULL ) {

		loaderror = (char *)dlerror();

	}

#elif defined(WIN32)

/* * */

	char errbuf[512];

	symbol = (void *)GetProcAddress((HMODULE)handle, name);

	if ( symbol == NULL ) {

		FormatMessage((FORMAT_MESSAGE_IGNORE_INSERTS |

					FORMAT_MESSAGE_FROM_SYSTEM),

				NULL, GetLastError(), 

				MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

				errbuf, SDL_TABLESIZE(errbuf), NULL);

		loaderror = errbuf;

	}

#elif defined(__BEOS__)

/* * */

	image_id library_id = (image_id)handle;

	if ( get_image_symbol(library_id,

		name, B_SYMBOL_TYPE_TEXT, &symbol) != B_NO_ERROR ) {

		loaderror = "Symbol not found";

	}

#elif defined(macintosh)

/* * */

	CFragSymbolClass class;

	CFragConnectionID library_id = (CFragConnectionID)handle;

	char pname[512];

	strncpy(pname, name, SDL_TABLESIZE(pname));

	pname[SDL_TABLESIZE(pname)-1] = '\0';

	if ( FindSymbol(library_id, C2PStr(pname),

	                (char **)&symbol, &class) != noErr ) {

		loaderror = "Symbol not found";

	}

#endif /* system type */

	if ( symbol == NULL ) {

		SDL_SetError("Failed loading %s: %s", name, loaderror);

	}

	return(symbol);

}

void SDL_UnloadObject(void *handle)

{

	if ( handle == NULL ) {

		return;

	}

#if defined(USE_DLOPEN)

/* * */

	dlclose(handle);

#elif defined(WIN32)

/* * */

	FreeLibrary((HMODULE)handle);

#elif defined(__BEOS__)

/* * */

	unload_add_on(library_id);

#elif defined(macintosh)

/* * */

	CFragConnectionID library_id = (CFragConnectionID)handle;

	CloseConnection(library_id);

#endif /* system type */

}