MODULE_SCOPE const TclIntStubs *tclIntStubsPtr;
MODULE_SCOPE const TclIntPlatStubs *tclIntPlatStubsPtr;

const TclStubs *tclStubsPtr = NULL;
const TclPlatStubs *tclPlatStubsPtr = NULL;
const TclIntStubs *tclIntStubsPtr = NULL;
const TclIntPlatStubs *tclIntPlatStubsPtr = NULL;

typedef Tcl_Obj *(NewStringObjProc) (const char *bytes, size_t length);


static const TclStubs *
HasStubSupport(
    Tcl_Interp *interp)
{
    Interp *iPtr = (Interp *) interp;

    if (!iPtr->stubTable) {
	/* No stub table at all? Nothing we can do. */
	return NULL;
    }
    if (iPtr->stubTable->magic != TCL_STUB_MAGIC) {
	/*
	 * We cannot acces interp->result and interp->freeProc
	 * any more: They will be gone in Tcl 9. In stead,
	 * assume that the iPtr->stubTable entry from Tcl_Interp
	 * and the Tcl_NewStringObj() and Tcl_SetObjResult() entries
	 * in the stub table don't change in Tcl 9. Need to add
	 * a test-case in Tcl 9 to assure that.
	 * 
	 * The signature of Tcl_NewStringObj will change: the length
	 * parameter will be of type size_t. But passing the value
	 * (size_t)-1 will work, whatever the signature will be.
	 */
	NewStringObjProc *newStringObj = (NewStringObjProc *)
		iPtr->stubTable->tcl_NewStringObj;
	iPtr->stubTable->tcl_SetObjResult(interp, newStringObj(
		"This extension is compiled for Tcl 8.x", (size_t)-1));

	return NULL;
    }
    return iPtr->stubTable;
}

/*
 * Use our own isdigit to avoid linking to libc on windows
 */

static int isDigit(const int c)