*
 * Copyright (c) 1995 Apple Computer, Inc.
 * Copyright (c) 2001-2007 Daniel A. Steffen <das@users.sourceforge.net>
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclLoadDyld.c,v 1.35 2010/04/02 21:21:06 kennykb Exp $
 */

#include "tclInt.h"

#ifndef MODULE_SCOPE
#define MODULE_SCOPE extern
#endif

#if (TCL_DYLD_USE_DLFCN && MAC_OS_X_VERSION_MIN_REQUIRED < 1040) || \
	defined(TCL_LOAD_FROM_MEMORY)
MODULE_SCOPE long tclMacOSXDarwinRelease;
#endif

#ifdef TCL_DEBUG_LOAD
#define TclLoadDbgMsg(m, ...) do { \

	    fprintf(stderr, "%s:%d: %s(): " m ".\n", \
	    strrchr(__FILE__, '/')+1, __LINE__, __func__, ##__VA_ARGS__); \

	} while (0)
#else
#define TclLoadDbgMsg(m, ...)
#endif


/* Static functions defined in this file */


static void* FindSymbol(Tcl_Interp* interp, Tcl_LoadHandle loadHandle,
			const char* symbol);
static void UnloadFile(Tcl_LoadHandle handle);



#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
/*
 *----------------------------------------------------------------------
 *
 * DyldOFIErrorMsg --
 *
 *	Converts a numerical NSObjectFileImage error into an error message
 *	string.
 *
 * Results:
 *	Error message string.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static const char*
DyldOFIErrorMsg(
    int err)
{
    switch(err) {
    case NSObjectFileImageSuccess:
	return NULL;
    case NSObjectFileImageFailure:

				 * (*unloadProcPtr)() to unload the file. */
    Tcl_FSUnloadFileProc **unloadProcPtr)
				/* Filled with address of Tcl_FSUnloadFileProc
				 * function which should be used for this
				 * file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle;
    Tcl_LoadHandle* newHandle;
#if TCL_DYLD_USE_DLFCN
    void *dlHandle = NULL;
#endif
#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
    const struct mach_header *dyldLibHeader = NULL;
    Tcl_DyldModuleHandle *modulePtr = NULL;
#endif

#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY)
	dyldLoadHandle->dyldLibHeader = dyldLibHeader;
	dyldLoadHandle->modulePtr = modulePtr;
#endif
	newHandle = (Tcl_LoadHandle) ckalloc(sizeof(*newHandle));
	newHandle->clientData = dyldLoadHandle;
	newHandle->findSymbolProcPtr = &FindSymbol;
	newHandle->unloadProcPtr = &UnloadFile;
	*unloadProcPtr = &UnloadFile;
	*loadHandle = newHandle;
	result = TCL_OK;
    } else {
	Tcl_AppendResult(interp, errMsg, NULL);
#if TCL_DYLD_USE_NSMODULE
	if (objFileImageErrMsg) {

 *	Returns a pointer to the function associated with 'symbol' if it is
 *	found. Otherwise returns NULL and may leave an error message in the
 *	interp's result.
 *
 *----------------------------------------------------------------------
 */

static void*
FindSymbol(
    Tcl_Interp *interp,		/* For error reporting. */
    Tcl_LoadHandle loadHandle,	/* Handle from TclpDlopen. */
    const char *symbol)		/* Symbol name to look up. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle =
	(Tcl_DyldLoadHandle *) (loadHandle->clientData);
    Tcl_PackageInitProc *proc = NULL;
    const char *errMsg = NULL;
    Tcl_DString ds;
    const char *native;

    native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds);
#if TCL_DYLD_USE_DLFCN

	}
	Tcl_DStringFree(&newName);
#endif /* TCL_DYLD_USE_NSMODULE */
    }
    Tcl_DStringFree(&ds);
    if (errMsg && (interp != NULL)) {
	Tcl_AppendResult(interp, errMsg, NULL);
	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, NULL);

    }
    return proc;
}

/*
 *----------------------------------------------------------------------
 *

static void
UnloadFile(
    Tcl_LoadHandle loadHandle)	/* loadHandle returned by a previous call to
				 * TclpDlopen(). The loadHandle is a token
				 * that represents the loaded file. */
{
    Tcl_DyldLoadHandle *dyldLoadHandle = 
	(Tcl_DyldLoadHandle *) (loadHandle->clientData);

#if TCL_DYLD_USE_DLFCN
    if (dyldLoadHandle->dlHandle) {
	int result;

	result = dlclose(dyldLoadHandle->dlHandle);
	if (!result) {

	    }
	    ptr = modulePtr;
	    modulePtr = modulePtr->nextPtr;
	    ckfree(ptr);
	}
#endif /* TCL_DYLD_USE_NSMODULE */
    }
    ckfree((char*) dyldLoadHandle);
    ckfree((char*) loadHandle);
}

/*
 *----------------------------------------------------------------------
 *
 * TclGuessPackageName --
 *