const char *name2,		/* Second part of variable name. */
    int flags)			/* Information about what happened. */
{
    register TkButton *butPtr = clientData;
    const char *value;
    Tcl_Obj *valuePtr;














    /*
     * If the variable is being unset, then just re-establish the trace unless
     * the whole interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
	butPtr->flags &= ~(SELECTED | TRISTATED);
	if (!Tcl_InterpDeleted(interp)) {
	    ClientData probe = NULL;

	    do {
		probe = Tcl_VarTraceInfo(interp,
			Tcl_GetString(butPtr->selVarNamePtr),
			TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
			ButtonVarProc, probe);
		if (probe == (ClientData)butPtr) {
		    break;
		}
	    } while (probe);
	    if (probe) {
		/* 
		 * We were able to fetch the unset trace for our
		 * selVarNamePtr, which means it is not unset and not
		 * the cause of this unset trace. Instead some outdated
		 * former variable must be, and we should ignore it.
		 */
		goto redisplay;
	    }
	    Tcl_TraceVar2(interp, Tcl_GetString(butPtr->selVarNamePtr),
		    NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    ButtonVarProc, clientData);
	}
	goto redisplay;
    }

 */

	/* ARGSUSED */
static char *
ButtonTextVarProc(
    ClientData clientData,	/* Information about button. */
    Tcl_Interp *interp,		/* Interpreter containing variable. */
    const char *name1,		/* Not used. */
    const char *name2,		/* Not used. */
    int flags)			/* Information about what happened. */
{
    TkButton *butPtr = clientData;
    Tcl_Obj *valuePtr;

    if (butPtr->flags & BUTTON_DELETED) {
	return NULL;
    }














    /*
     * If the variable is unset, then immediately recreate it unless the whole
     * interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
	if (!Tcl_InterpDeleted(interp) && butPtr->textVarNamePtr != NULL) {

	    /*
	     * An unset trace on some variable brought us here, but is it
	     * the variable we have stored in butPtr->textVarNamePtr ? 
	     */

	    ClientData probe = NULL;

	    do {
		probe = Tcl_VarTraceInfo(interp,
			Tcl_GetString(butPtr->textVarNamePtr),
			TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
			ButtonTextVarProc, probe);
		if (probe == (ClientData)butPtr) {
		    break;
		}
	    } while (probe);
	    if (probe) {
		/* 
		 * We were able to fetch the unset trace for our
		 * textVarNamePtr, which means it is not unset and not
		 * the cause of this unset trace. Instead some outdated
		 * former textvariable must be, and we should ignore it.
		 */
		return NULL;
	    }

	    Tcl_ObjSetVar2(interp, butPtr->textVarNamePtr, NULL,
		    butPtr->textPtr, TCL_GLOBAL_ONLY);
	    Tcl_TraceVar2(interp, Tcl_GetString(butPtr->textVarNamePtr),
		    NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    ButtonTextVarProc, clientData);
	}
	return NULL;

 */

	/* ARGSUSED */
static char *
EntryTextVarProc(
    ClientData clientData,	/* Information about button. */
    Tcl_Interp *interp,		/* Interpreter containing variable. */
    const char *name1,		/* Not used. */
    const char *name2,		/* Not used. */
    int flags)			/* Information about what happened. */
{
    Entry *entryPtr = clientData;
    const char *value;

    if (entryPtr->flags & ENTRY_DELETED) {
	/*
	 * Just abort early if we entered here while being deleted.
	 */
	return NULL;
    }














    /*
     * If the variable is unset, then immediately recreate it unless the whole
     * interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
        if (!Tcl_InterpDeleted(interp) && entryPtr->textVarName) {
            ClientData probe = NULL;

            do {
                probe = Tcl_VarTraceInfo(interp,
                        entryPtr->textVarName,
                        TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                        EntryTextVarProc, probe);
                if (probe == (ClientData)entryPtr) {
                    break;
                }
            } while (probe);
            if (probe) {
                /*
                 * We were able to fetch the unset trace for our
                 * textVarName, which means it is not unset and not
                 * the cause of this unset trace. Instead some outdated
                 * former variable must be, and we should ignore it.
                 */
                return NULL;
            }
	    Tcl_SetVar2(interp, entryPtr->textVarName, NULL,
		    entryPtr->string, TCL_GLOBAL_ONLY);
	    Tcl_TraceVar2(interp, entryPtr->textVarName, NULL,
		    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    EntryTextVarProc, clientData);
	    entryPtr->flags |= ENTRY_VAR_TRACED;
	}

 *----------------------------------------------------------------------
 */

static char *
ListboxListVarProc(
    ClientData clientData,	/* Information about button. */
    Tcl_Interp *interp,		/* Interpreter containing variable. */
    const char *name1,		/* Not used. */
    const char *name2,		/* Not used. */
    int flags)			/* Information about what happened. */
{
    Listbox *listPtr = clientData;
    Tcl_Obj *oldListObj, *varListObj;
    int oldLength, i;
    Tcl_HashEntry *entry;














    /*
     * Bwah hahahaha! Puny mortal, you can't unset a -listvar'd variable!
     */

    if (flags & TCL_TRACE_UNSETS) {

        if (!Tcl_InterpDeleted(interp) && listPtr->listVarName) {
            ClientData probe = NULL;

            do {
                probe = Tcl_VarTraceInfo(interp,
                        listPtr->listVarName,
                        TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                        ListboxListVarProc, probe);
                if (probe == (ClientData)listPtr) {
                    break;
                }
            } while (probe);
            if (probe) {
                /*
                 * We were able to fetch the unset trace for our
                 * listVarName, which means it is not unset and not
                 * the cause of this unset trace. Instead some outdated
                 * former variable must be, and we should ignore it.
                 */
                return NULL;
            }
	    Tcl_SetVar2Ex(interp, listPtr->listVarName, NULL,
		    listPtr->listObj, TCL_GLOBAL_ONLY);
	    Tcl_TraceVar2(interp, listPtr->listVarName,
		    NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    ListboxListVarProc, clientData);
	    return NULL;
	}

    int flags)			/* Describes what just happened. */
{
    TkMenuEntry *mePtr = clientData;
    TkMenu *menuPtr;
    const char *value;
    const char *name, *onValue;

    if (Tcl_InterpDeleted(interp) || (mePtr->namePtr == NULL)) {
	/*
	 * Do nothing if the interpreter is going away or we have
	 * no variable name.
	 */

    	return NULL;
    }

    menuPtr = mePtr->menuPtr;

    if (menuPtr->menuFlags & MENU_DELETION_PENDING) {
    	return NULL;











    }

    name = Tcl_GetString(mePtr->namePtr);

    /*
     * If the variable is being unset, then re-establish the trace.
     */

    if (flags & TCL_TRACE_UNSETS) {
        ClientData probe = NULL;
	mePtr->entryFlags &= ~ENTRY_SELECTED;

        do {
                probe = Tcl_VarTraceInfo(interp, name,
                        TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                        MenuVarProc, probe);
                if (probe == (ClientData)mePtr) {
                    break;
                }
        } while (probe);
        if (probe) {
                /* 
                 * We were able to fetch the unset trace for our
                 * namePtr, which means it is not unset and not
                 * the cause of this unset trace. Instead some outdated
                 * former variable must be, and we should ignore it.
                 */
		return NULL;
        }
	Tcl_TraceVar2(interp, name, NULL,
		TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		MenuVarProc, clientData);
	TkpConfigureMenuEntry(mePtr);
	TkEventuallyRedrawMenu(menuPtr, NULL);
	return NULL;
    }

    /*
     * Use the value of the variable to update the selected status of the menu

 *	Arrange for an entry of a menu, or the whole menu, to be redisplayed
 *	at some point in the future.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	A when-idle handler is scheduled to do the redisplay, if there isn't
 *	one already scheduled.
 *
 *----------------------------------------------------------------------
 */

void
TkEventuallyRedrawMenu(

    const char *name2,		/* Second part of variable name. */
    int flags)			/* Information about what happened. */
{
    register TkMenuButton *mbPtr = clientData;
    const char *value;
    unsigned len;














    /*
     * If the variable is unset, then immediately recreate it unless the whole
     * interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
        if (!Tcl_InterpDeleted(interp) && mbPtr->textVarName) {
            ClientData probe = NULL;

            do {
                probe = Tcl_VarTraceInfo(interp,
                        mbPtr->textVarName,
                        TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                        MenuButtonTextVarProc, probe);
                if (probe == (ClientData)mbPtr) {
                    break;
                }
            } while (probe);
            if (probe) {
                /*
                 * We were able to fetch the unset trace for our
                 * textVarName, which means it is not unset and not
                 * the cause of this unset trace. Instead some outdated
                 * former variable must be, and we should ignore it.
                 */
                return NULL;
            }
	    Tcl_SetVar2(interp, mbPtr->textVarName, NULL, mbPtr->text,
		    TCL_GLOBAL_ONLY);
	    Tcl_TraceVar2(interp, mbPtr->textVarName, NULL,
		    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    MenuButtonTextVarProc, clientData);
	}
	return NULL;

    const char *name1,		/* Name of variable. */
    const char *name2,		/* Second part of variable name. */
    int flags)			/* Information about what happened. */
{
    register Message *msgPtr = clientData;
    const char *value;














    /*
     * If the variable is unset, then immediately recreate it unless the whole
     * interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
        if (!Tcl_InterpDeleted(interp) && msgPtr->textVarName) {
            ClientData probe = NULL;

            do {
                probe = Tcl_VarTraceInfo(interp,
                        msgPtr->textVarName,
                        TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                        MessageTextVarProc, probe);
                if (probe == (ClientData)msgPtr) {
                    break;
                }
            } while (probe);
            if (probe) {
                /*
                 * We were able to fetch the unset trace for our
                 * textVarName, which means it is not unset and not
                 * the cause of this unset trace. Instead some outdated
                 * former variable must be, and we should ignore it.
                 */
                return NULL;
            }
	    Tcl_SetVar2(interp, msgPtr->textVarName, NULL, msgPtr->string,
		    TCL_GLOBAL_ONLY);
	    Tcl_TraceVar2(interp, msgPtr->textVarName, NULL,
		    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    MessageTextVarProc, clientData);
	}
	return NULL;

{
    register TkScale *scalePtr = clientData;
    const char *resultStr;
    double value;
    Tcl_Obj *valuePtr;
    int result;














    /*
     * If the variable is unset, then immediately recreate it unless the whole
     * interpreter is going away.
     */

    if (flags & TCL_TRACE_UNSETS) {
        if (!Tcl_InterpDeleted(interp) && scalePtr->varNamePtr) {
            ClientData probe = NULL;

            do {
                probe = Tcl_VarTraceInfo(interp,
                        Tcl_GetString(scalePtr->varNamePtr),
                        TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
                        ScaleVarProc, probe);
                if (probe == (ClientData)scalePtr) {
                    break;
                }
            } while (probe);
            if (probe) {
                /* 
                 * We were able to fetch the unset trace for our
                 * varNamePtr, which means it is not unset and not
                 * the cause of this unset trace. Instead some outdated
                 * former variable must be, and we should ignore it.
                 */
                return NULL;
            }
	    Tcl_TraceVar2(interp, Tcl_GetString(scalePtr->varNamePtr),
		    NULL, TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
		    ScaleVarProc, clientData);
	    scalePtr->flags |= NEVER_SET;
	    TkScaleSetValue(scalePtr, scalePtr->value, 1, 0);
	}
	return NULL;

/*
 * Tcl_VarTraceProc for trace handles.
 */
static char *
VarTraceProc(
    ClientData clientData,	/* Widget record pointer */
    Tcl_Interp *interp, 	/* Interpreter containing variable. */
    const char *name1,		/* (unused) */
    const char *name2,		/* (unused) */
    int flags)			/* Information about what happened. */
{
    Ttk_TraceHandle *tracePtr = clientData;
    const char *name, *value;
    Tcl_Obj *valuePtr;

    if (flags & TCL_INTERP_DESTROYED) {
	return NULL;
    }












    name = Tcl_GetString(tracePtr->varnameObj);

    /*
     * If the variable is being unset, then re-establish the trace:
     */
    if (flags & TCL_TRACE_DESTROYED) {
	/*

#else
		    SdlTkX.screen->mwidth = (width * 254 + 360) / 720;
		    SdlTkX.screen->mheight = (height * 254 + 360) / 720;
#endif
		}
		dpy = SdlTkX.display->next_display;
		while (dpy != NULL) {
		    /* to pick up mwidth/mheight info */
		    SdlTkGenerateConfigureNotify(dpy, dpy->screens[0].root);
		    dpy = dpy->next_display;
		}
		_w = (_Window *) SdlTkX.screen->root;


		pixel = SDL_MapRGB(SdlTkX.sdlsurf->format,
#ifdef ANDROID
				   0x00, 0x00, 0x00
#else
				   0x00, 0x4E, 0x78
#endif
				   );

		    sr.y = oldh;
		    sr.h = height - oldh;
		    sr.x = 0;
		    sr.w = width;
		    SDL_FillRect(SdlTkX.sdlsurf, &sr, pixel);
		}


		SdlTkResizeWindow(SdlTkX.display, (Window) _w, width, height);


		child = _w->child;
		while (child != NULL) {
		    if (child->fullscreen) {
			int xx, yy, ww, hh;
			_Window *_ww = child;

	SdlTkUnlock(NULL);
    }
    if (objc <= 1) {
	Tcl_SetResult(interp, buffer, TCL_VOLATILE);
    }
    return TCL_OK;
}

static int
SizeObjCmd(ClientData clientData, Tcl_Interp *interp,
	   int objc, Tcl_Obj *const objv[])
{
    int w, h;
    char buffer[128];

    if ((objc != 1) && (objc != 3)) {
	Tcl_WrongNumArgs(interp, 1, objv, "?width height?");
	return TCL_ERROR;
    }
    if (objc > 1) {
	if ((Tcl_GetIntFromObj(interp, objv[1], &w) != TCL_OK) ||
	    (Tcl_GetIntFromObj(interp, objv[2], &h) != TCL_OK)) {
	    return TCL_ERROR;
	}
	if ((w <= 0) || (h <= 0)) {
	    Tcl_SetResult(interp, "unsupported width or height", TCL_STATIC);
	    return TCL_ERROR;
	}
    }
    if (objc > 1) {
	SdlTkSetWindowSize(w, h);
    } else {
	SdlTkLock(NULL);
	SDL_GetWindowSize(SdlTkX.sdlscreen, &w, &h);
	SdlTkUnlock(NULL);
	sprintf(buffer, "%d %d", w, h);
    }
    if (objc <= 1) {
	Tcl_SetResult(interp, buffer, TCL_VOLATILE);
    }
    return TCL_OK;
}

static int
ScreensaverObjCmd(ClientData clientData, Tcl_Interp *interp,
		  int objc, Tcl_Obj *const objv[])
{
    int flag;

    { "maximize", MaximizeObjCmd, NULL },
    { "paintvisrgn", PaintvisrgnObjCmd, NULL },
    { "pointer", PointerObjCmd, NULL },
    { "powerinfo", PowerinfoObjCmd, NULL },
    { "restore", RestoreObjCmd, NULL },
    { "root", RootObjCmd, NULL },
    { "screensaver", ScreensaverObjCmd, NULL },
    { "size", SizeObjCmd, NULL },
    { "stat", StatObjCmd, NULL },
    { "textinput", TextinputObjCmd, NULL },
    { "touchcalibration", TouchcalibObjCmd, NULL },
    { "touchtranslate", TouchtranslateObjCmd, NULL },
    { "viewport", ViewportObjCmd, NULL },
    { "vrmode", VRModeObjCmd, NULL },
    { "vsync", VsyncObjCmd, NULL },

extern void SdlTkSetWindowFlags(int flags, int x, int y, int w, int h);
extern void SdlTkSetWindowOpacity(double opacity);
extern void SdlTkSetWindowTitle(SDL_Window *window, const char *title);
extern void SdlTkStartStopTextInput(int on);
extern void SdlTkSetTextInputRect(SDL_Rect *rect, int hints);
extern void SdlTkWarpPointer(int x, int y);
extern int SdlTkShowPointer(int flag);
extern void SdlTkSetWindowSize(int w, int h);
extern int SdlTkKeysym2Unicode(KeySym keysym);
extern KeySym SdlTkUnicode2Keysym(int ucs);
extern KeySym SdlTkUtf2KeySym(const char *utf, int len, int *lenret);
extern void SdlTkMoveWindow(Display *display, Window w, int x, int y);
extern void SdlTkMoveResizeWindow(Display *display, Window w, int x, int y,
    unsigned int width, unsigned int height);
extern void SdlTkResizeWindow(Display *display, Window w,

    }
    return 1;
}

static Tcl_HashEntry *
ffkAllocEntry(Tcl_HashTable *tablePtr, void *keyPtr)
{

    unsigned size;
    Tcl_HashEntry *hPtr;

    size = sizeof (Tcl_HashEntry) + sizeof (FileFaceKey);
    hPtr = ckalloc(size);
    memcpy(hPtr->key.words, keyPtr, sizeof (FileFaceKey));
    hPtr->clientData = NULL;

    event.user.data2 = (void *) &wreq;
    SDL_PeepEvents(&event, 1, SDL_ADDEVENT, 0, 0);
    while (wreq.running) {
	SdlTkWaitLock();
    }
    return wreq.y;
}

#ifndef ANDROID
static void
HandleWindowSize(struct RootSizeRequest *r)
{
    int width, height;

    if (SdlTkX.is_framebuffer || SdlTkX.arg_fullscreen ||
	!SdlTkX.arg_resizable) {
	goto done;
    }
    SDL_GetWindowSize(SdlTkX.sdlscreen, &width, &height);
    if ((width == r->width) && (height == r->height)) {
	goto done;
    }
    SDL_SetWindowSize(SdlTkX.sdlscreen, r->width, r->height);
done:
    if (r->running) {
	r->running = 0;
	SdlTkNotify();
    }
}
#endif

void
SdlTkSetWindowSize(int w, int h)
{
#ifndef ANDROID
    struct RootSizeRequest root;
    SDL_Event event;

    SdlTkLock(NULL);
    root.running = 1;
    root.width = w;
    root.height = h;
    event.type = SDL_USEREVENT;
    event.user.windowID = 0;
    event.user.code = 0;
    event.user.data1 = (void *) HandleWindowSize;
    event.user.data2 = (void *) &root;
    SDL_PeepEvents(&event, 1, SDL_ADDEVENT, 0, 0);
    while (root.running) {
	SdlTkWaitLock();
    }
    SdlTkUnlock(NULL);
#endif
}

/*
 *----------------------------------------------------------------------
 *
 * TimerCallback --
 *
 *	SDL timer callback function invoked every 10/20/200/400 ms.

    SdlTkX.is_framebuffer = 1;
#else
    /* Determine framebuffer mode from video driver. */
    if (strcmp(SDL_GetCurrentVideoDriver(), "KMSDRM") == 0) {
	SdlTkX.is_framebuffer = 1;
    } else if (strcmp(SDL_GetCurrentVideoDriver(), "RPI") == 0) {
	SdlTkX.is_framebuffer = 1;
    } else if (strcmp(SDL_GetCurrentVideoDriver(), "jsmpeg") == 0) {
	SdlTkX.is_framebuffer = 1;
    } else {
	SdlTkX.is_framebuffer = 0;
    }
#endif
    SdlTkX.scale = SdlTkX.scale_min = 1.0f;
    SdlTkX.outrect = NULL;
    SdlTkX.viewport.x = 0;

		markDone = 1;
	    } else if ((sdl_event.user.data1 == HandleRootSize) &&
		       (sdl_event.user.data2 != NULL)) {
		HandleRootSize((struct RootSizeRequest *)
			       sdl_event.user.data2);
		markDone = 1;
#ifndef ANDROID
	    } else if ((sdl_event.user.data1 == HandleWindowSize) &&
		       (sdl_event.user.data2 != NULL)) {
		HandleWindowSize((struct RootSizeRequest *)
			       sdl_event.user.data2);
		markDone = 1;
	    } else if ((sdl_event.user.data1 == HandleWindowFlags) &&
		       (sdl_event.user.data2 != NULL)) {
		HandleWindowFlags((struct WindowFlagsRequest *)
				  sdl_event.user.data2);
		markDone = 1;
#endif
#if defined(__APPLE__) || defined(_WIN32)

    focus -force .top.b
    update
    event generate .top.b <space>
    update  ; # shall not trigger error  invalid command name ".top.b"
} -cleanup {
    destroy .top.b .top
} -result {}

test button-15.1 {Bug [5d991b822e]} {
    # Want this not to segfault
    set var INIT
    button .b -textvariable var
    trace add variable var unset {apply {args {
	.b configure -textvariable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
} {}
test button-15.2 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    button .b -textvariable var
    trace add variable var unset {apply {args {
	.b configure -textvariable new
    }}}
    pack .b
    bind .b <Configure> {unset -nocomplain var}
    update
    destroy .b
    unset new
} {}
test button-15.3 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    checkbutton .b -variable var
    trace add variable var unset {apply {args {
	.b configure -variable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
} {}


imageFinish
cleanupTests
return

# Local variables:
# mode: tcl

    destroy .e
} -body {
    catch {entry .e -textvariable thisnsdoesntexist::myvar} result1
    set result1
} -cleanup {
  destroy .e
} -result {can't trace "thisnsdoesntexist::myvar": parent namespace doesn't exist}

test entry-25.1 {Bug [5d991b822e]} {
    # Want this not to segfault, or write to variable with empty name
    set var INIT
    entry .b -textvariable var
    trace add variable var unset {apply {args {
        .b configure -textvariable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
    info exists {}
} 0
test entry-25.2 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    entry .b -textvariable var
    trace add variable var unset {apply {args {
        .b configure -textvariable new
    }}}
    pack .b
    bind .b <Configure> {unset -nocomplain var}
    update
    destroy .b
    unset new
} {}


# Gathered comments about lacks
# XXX Still need to write tests for EntryBlinkProc, EntryFocusProc,
# and EntryTextVarProc.
# No tests for DisplayEntry.
# XXX Still need to write tests for EntryScanTo and EntrySelectTo.
# No tests for EventuallyRedraw

    event generate .l <1> -x 5 -y 5  ; # <<ListboxSelect>> fires
    selection clear                  ; # <<ListboxSelect>> fires again
    update
    set res
} -cleanup {
    destroy .l
} -result {{.l 0} {{} {}}}

test listbox-32.1 {Bug [5d991b822e]} {
    # Want this not to segfault, or write to variable with empty name
    set var INIT
    listbox .b -listvariable var
    trace add variable var unset {apply {args {
        .b configure -listvariable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
    info exists {}
} 0
test listbox-32.2 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    listbox .b -listvariable var
    trace add variable var unset {apply {args {
        .b configure -listvariable new
    }}}
    pack .b
    bind .b <Configure> {unset -nocomplain var}
    update
    destroy .b
    unset new
} {}

resetGridInfo
deleteWindows
option clear

# cleanup
cleanupTests

    menu .m1
    set foo "hello"
    list [.m1 add checkbutton -variable foo -onvalue hello -offvalue goodbye] \
		[set foo "goodbye"] [unset foo]
} -cleanup {
	deleteWindows
} -result {{} goodbye {}}
test menu-17.6 {MenuVarProc [5d991b822e]} -setup {
	deleteWindows
} -body {
    # Want this not to crash
    menu .b
    set var INIT
    .b add checkbutton -variable var
    trace add variable var unset {apply {args {
        .b entryconfigure 1 -variable {}
    }}}
    unset var
} -cleanup {
	deleteWindows
} -result {}
test menu-17.7 {MenuVarProc [5d991b822e]} -setup {
	deleteWindows
} -body {
    # Want this not to duplicate traces
    menu .b
    set var INIT
    .b add checkbutton -variable var
    trace add variable var unset {apply {args {
        .b entryconfigure 1 -variable new
    }}}
    unset var
} -cleanup {
	deleteWindows
} -result {}


test menu-18.1 {TkActivateMenuEntry} -setup {
	deleteWindows
} -body {
    menu .m1
    .m1 add command -label "test"

    menubutton .mb
    interp hide {} .mb
    destroy .mb
    set res1 [list [winfo children .] [interp hidden]]
    set res2 [list {} $l]
    expr {$res1 eq $res2}
} -result 1

test menubutton-9.1 {Bug [5d991b822e]} {
    # Want this not to segfault, or write to variable with empty name
    unset -nocomplain {}
    set var INIT
    menubutton .b -textvariable var
    trace add variable var unset {apply {args {
        .b configure -textvariable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
    info exists {}
} 0
test menubutton-9.2 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    menubutton .b -textvariable var
    trace add variable var unset {apply {args {
        .b configure -textvariable new
    }}}
    pack .b
    bind .b <Configure> {unset -nocomplain var}
    update
    destroy .b
    unset new
} {}




deleteWindows
option clear
imageFinish

} -body {
    .m configure -bd 4
    .m configure -bg #ffffff
    lindex [.m configure -bd] 4
} -cleanup {
    destroy .m
} -result {4}

test message-4.1 {Bug [5d991b822e]} {
    # Want this not to segfault, or write to variable with empty name
    unset -nocomplain {}
    set var INIT
    message .b -textvariable var
    trace add variable var unset {apply {args {
        .b configure -textvariable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
    info exists {}
} 0
test message-4.2 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    message .b -textvariable var
    trace add variable var unset {apply {args {
        .b configure -textvariable new
    }}}
    pack .b
    bind .b <Configure> {unset -nocomplain var}
    update
    destroy .b
    unset new
} {}

cleanupTests
return

} -body {
    pack [scale .s]
    # non-regression test for bug [55b95f578a] - shall just not crash
    .s configure -from -6.8e99 -to 8.8e99
} -cleanup {
    destroy .s
} -result {}

test scale-22.1 {Bug [5d991b822e]} {
    # Want this not to crash
    set var INIT
    scale .b -variable var
    trace add variable var unset {apply {args {
        .b configure -variable {}
    }}}
    pack .b
    bind .b <Configure> {unset var}
    update
    destroy .b
} {}
test scale-22.2 {Bug [5d991b822e]} {
    # Want this not to leak traces
    set var INIT
    scale .b -variable var
    trace add variable var unset {apply {args {
        .b configure -variable new
    }}}
    pack .b
    bind .b <Configure> {unset -nocomplain var}
    update
    destroy .b
    unset new
} {}

option clear

# cleanup
cleanupTests
return

The return value from \fIproc\fR is only used during read and
write tracing.
During unset traces, the return value is ignored and all relevant
trace procedures will always be invoked.
.SH "RESTRICTIONS"
.PP
A trace procedure can be called at any time, even when there
are partially formed results stored in the interpreter.  If
the trace procedure does anything that could damage this result (such
as calling \fBTcl_Eval\fR) then it must use the \fBTcl_SaveInterpState\fR
and related routines to save and restore the original state of
the interpreter before it returns.
.SH "UNDEFINED VARIABLES"
.PP
It is legal to set a trace on an undefined variable.
The variable will still appear to be undefined until the
first time its value is set.
If an undefined variable is traced and then unset, the unset will fail
with an error

	     * long range get auto-narrowed to tclIntType, while all the
	     * values in the unsigned long range will fit in a long.
	     */

	    mp_int big;

	    UNPACK_BIGNUM(objPtr, big);
	    if ((size_t) big.used <= (CHAR_BIT * sizeof(long) + MP_DIGIT_BIT - 1)
		    / MP_DIGIT_BIT) {
		unsigned long value = 0, numBytes = sizeof(long);
		long scratch;
		unsigned char *bytes = (unsigned char *) &scratch;

		if (mp_to_unsigned_bin_n(&big, bytes, &numBytes) == MP_OKAY) {
		    while (numBytes-- > 0) {
			value = (value << CHAR_BIT) | *bytes++;

	     * Tcl_WideInt, even when auto-narrowing is enabled.
	     */

	    mp_int big;

	    UNPACK_BIGNUM(objPtr, big);
	    if ((size_t) big.used <= (CHAR_BIT * sizeof(Tcl_WideInt)
		     + MP_DIGIT_BIT - 1) / MP_DIGIT_BIT) {
		Tcl_WideUInt value = 0;
		unsigned long numBytes = sizeof(Tcl_WideInt);
		Tcl_WideInt scratch;
		unsigned char *bytes = (unsigned char *) &scratch;

		if (mp_to_unsigned_bin_n(&big, bytes, &numBytes) == MP_OKAY) {
		    while (numBytes-- > 0) {

    Tcl_Obj *objPtr,		/* Object to set */
    mp_int *bignumValue)	/* Value to store */
{
    if (Tcl_IsShared(objPtr)) {
	Tcl_Panic("%s called with shared object", "Tcl_SetBignumObj");
    }
    if ((size_t) bignumValue->used
	    <= (CHAR_BIT * sizeof(long) + MP_DIGIT_BIT - 1) / MP_DIGIT_BIT) {
	unsigned long value = 0, numBytes = sizeof(long);
	long scratch;
	unsigned char *bytes = (unsigned char *) &scratch;

	if (mp_to_unsigned_bin_n(bignumValue, bytes, &numBytes) != MP_OKAY) {
	    goto tooLargeForLong;
	}

	}
	mp_clear(bignumValue);
	return;
    }
  tooLargeForLong:
#ifndef TCL_WIDE_INT_IS_LONG
    if ((size_t) bignumValue->used
	    <= (CHAR_BIT * sizeof(Tcl_WideInt) + MP_DIGIT_BIT - 1) / MP_DIGIT_BIT) {
	Tcl_WideUInt value = 0;
	unsigned long numBytes = sizeof(Tcl_WideInt);
	Tcl_WideInt scratch;
	unsigned char *bytes = (unsigned char *)&scratch;

	if (mp_to_unsigned_bin_n(bignumValue, bytes, &numBytes) != MP_OKAY) {
	    goto tooLargeForWide;

     * significand (the most significant) corresponds to the
     * 2**(binExponent+M2 + 1) bit of 2*M2*v. Allocate enough digits to hold
     * that quantity, then convert the significand to a large integer, scaled
     * appropriately. Then multiply by the appropriate power of 5.
     */

    msb = binExponent + M2;	/* 1008 */
    nDigits = msb / MP_DIGIT_BIT + 1;
    mp_init_size(&twoMv, nDigits);
    i = (msb % MP_DIGIT_BIT + 1);
    twoMv.used = nDigits;
    significand *= SafeLdExp(1.0, i);
    while (--nDigits >= 0) {
	twoMv.dp[nDigits] = (mp_digit) significand;
	significand -= (mp_digit) significand;
	significand = SafeLdExp(significand, MP_DIGIT_BIT);
    }
    for (i = 0; i <= 8; ++i) {
	if (M5 & (1 << i)) {
	    mp_mul(&twoMv, pow5+i, &twoMv);
	}
    }

static inline int
ShouldBankerRoundUpPowD(
    mp_int *b,			/* Numerator of the fraction. */
    int sd,			/* Denominator is 2**(sd*DIGIT_BIT). */
    int isodd)			/* 1 if the digit is odd, 0 if even. */
{
    int i;
    static const mp_digit topbit = ((mp_digit)1) << (MP_DIGIT_BIT - 1);

    if (b->used < sd || (b->dp[sd-1] & topbit) == 0) {
	return 0;
    }
    if (b->dp[sd-1] != topbit) {
	return 1;
    }

	     * The denominator is a power of 2, so we can replace division by
	     * digit shifts. First we round up s2 to a multiple of DIGIT_BIT,
	     * and adjust m2 and b2 accordingly. Then we launch into a version
	     * of the comparison that's specialized for the 'power of mp_digit
	     * in the denominator' case.
	     */

	    if (s2 % MP_DIGIT_BIT != 0) {
		int delta = MP_DIGIT_BIT - (s2 % MP_DIGIT_BIT);

		b2 += delta;
		m2plus += delta;
		m2minus += delta;
		s2 += delta;
	    }
	    return ShorteningBignumConversionPowD(&d, convType, bw, b2, b5,
		    m2plus, m2minus, m5, s2/MP_DIGIT_BIT, k, len, ilim, ilim1,
		    decpt, endPtr);
	} else {
	    /*
	     * Alas, there's no helpful special case; use full-up bignum
	     * arithmetic for the conversion.
	     */

	     * The denominator is a power of 2, so we can replace division by
	     * digit shifts. First we round up s2 to a multiple of DIGIT_BIT,
	     * and adjust m2 and b2 accordingly. Then we launch into a version
	     * of the comparison that's specialized for the 'power of mp_digit
	     * in the denominator' case.
	     */

	    if (s2 % MP_DIGIT_BIT != 0) {
		int delta = MP_DIGIT_BIT - (s2 % MP_DIGIT_BIT);

		b2 += delta;
		s2 += delta;
	    }
	    return StrictBignumConversionPowD(&d, convType, bw, b2, b5,
		    s2/MP_DIGIT_BIT, k, len, ilim, ilim1, decpt, endPtr);
	} else {
	    /*
	     * There are no helpful special cases, but at least we know in
	     * advance how many digits we will convert. We can run the
	     * conversion in steps of DIGIT_GROUP digits, so as to have many
	     * fewer mp_int divisions.
	     */

     * the significand of a double.
     */

    maxDigits = (int) ((DBL_MAX_EXP * log((double) FLT_RADIX)
	    + 0.5 * log(10.)) / log(10.));
    minDigits = (int) floor((DBL_MIN_EXP - DBL_MANT_DIG)
	    * log((double) FLT_RADIX) / log(10.));
    log10_DIGIT_MAX = (int) floor(MP_DIGIT_BIT * log(2.) / log(10.));

    /*
     * Nokia 770's software-emulated floating point is "middle endian": the
     * bytes within a 32-bit word are little-endian (like the native
     * integers), but the two words of a 'double' are presented most
     * significant word first.
     */

    /*
     * Accumulate the result, one mp_digit at a time.
     */

    r = 0.0;
    for (i=b.used-1 ; i>=0 ; --i) {
	r = ldexp(r, MP_DIGIT_BIT) + b.dp[i];
    }
    mp_clear(&b);

    /*
     * Scale the result to the correct number of bits.
     */

	    } else {
		mp_copy(a, &b);
	    }
	    if (!exact) {
		mp_add_d(&b, 1, &b);
	    }
	    for (i=b.used-1 ; i>=0 ; --i) {
		r = ldexp(r, MP_DIGIT_BIT) + b.dp[i];
	    }
	    r = ldexp(r, bits - mantBits);
	}
    }
    mp_clear(&b);
    return r;
}

		mp_mul_2d(a, shift, &b);
	    } else if (shift < 0) {
		mp_div_2d(a, -shift, &b, NULL);
	    } else {
		mp_copy(a, &b);
	    }
	    for (i=b.used-1 ; i>=0 ; --i) {
		r = ldexp(r, MP_DIGIT_BIT) + b.dp[i];
	    }
	    r = ldexp(r, bits - mantBits);
	}
    }
    mp_clear(&b);
    return r;
}

    /*
     * Accumulate the result, one mp_digit at a time.
     */

    r = 0.0;
    for (i=b.used-1; i>=0; --i) {
	r = ldexp(r, MP_DIGIT_BIT) + b.dp[i];
    }
    mp_clear(&b);

    /*
     * Return the result with the appropriate sign.
     */

		    bits = uw;
		    while (uw) {
			numDigits++;
			uw /= base;
		    }
#endif
		} else if (useBig && big.used) {
		    int leftover = (big.used * MP_DIGIT_BIT) % numBits;
		    mp_digit mask = (~(mp_digit)0) << (MP_DIGIT_BIT-leftover);

		    numDigits = 1 +
			    (((Tcl_WideInt) big.used * MP_DIGIT_BIT) / numBits);
		    while ((mask & big.dp[big.used-1]) == 0) {
			numDigits--;
			mask >>= numBits;
		    }
		    if (numDigits > INT_MAX) {
			msg = overflow;
			errCode = "OVERFLOW";

		bytes = TclGetString(pure);
		toAppend = length = (int) numDigits;
		while (numDigits--) {
		    int digitOffset;

		    if (useBig && big.used) {
			if (index < big.used && (size_t) shift <
				CHAR_BIT*sizeof(Tcl_WideUInt) - MP_DIGIT_BIT) {
			    bits |= ((Tcl_WideUInt) big.dp[index++]) << shift;
			    shift += MP_DIGIT_BIT;
			}
			shift -= numBits;
		    }
		    digitOffset = (int) (bits % base);
		    if (digitOffset > 9) {
			if (ch == 'X') {
			    bytes[numDigits] = 'A' + digitOffset - 10;

/* LibTomMath, multiple-precision integer library -- Tom St Denis */








/* SPDX-License-Identifier: Unlicense */

#ifndef BN_H_
#define BN_H_

#include "tclTomMathDecls.h"
#ifndef MODULE_SCOPE
#define MODULE_SCOPE extern
#endif

#   define DIGIT_BIT (((CHAR_BIT * MP_SIZEOF_MP_DIGIT) - 1))  /* bits per digit */
#endif

#define MP_DIGIT_BIT     DIGIT_BIT
#define MP_MASK          ((((mp_digit)1)<<((mp_digit)DIGIT_BIT))-((mp_digit)1))
#define MP_DIGIT_MAX     MP_MASK

typedef int mp_sign;
#define MP_ZPOS       0   /* positive integer */
#define MP_NEG        1   /* negative */
typedef int mp_ord;
#define MP_LT        -1   /* less than */
#define MP_EQ         0   /* equal to */
#define MP_GT         1   /* greater than */
typedef int mp_bool;
#define MP_YES        1   /* yes response */
#define MP_NO         0   /* no response */
typedef int mp_err;
#define MP_OKAY       0   /* ok result */
#define MP_ERR        -1  /* unknown error */
#define MP_MEM        -2  /* out of mem */
#define MP_VAL        -3  /* invalid input */
#define MP_RANGE      MP_VAL
#define MP_ITER       -4  /* Max. iterations reached */




/* Primality generation flags */
#define LTM_PRIME_BBS      0x0001 /* BBS style prime */
#define LTM_PRIME_SAFE     0x0002 /* Safe prime (p-1)/2 == prime */
#define LTM_PRIME_2MSB_ON  0x0008 /* force 2nd MSB to 1 */

/* tunable cutoffs */

/* define this to use lower memory usage routines (exptmods mostly) */
/* #define MP_LOW_MEM */

/* default precision */
#ifndef MP_PREC
#   ifndef MP_LOW_MEM
#      define MP_PREC 32        /* default digits of precision */
#   elif defined(MP_8BIT)
#      define MP_PREC 16        /* default digits of precision */
#   else
#      define MP_PREC 8         /* default digits of precision */
#   endif
#endif

/* size of comba arrays, should be at least 2 * 2**(BITS_PER_WORD - BITS_PER_DIGIT*2) */
#define MP_WARRAY               (1u << (((sizeof(mp_word) * CHAR_BIT) - (2 * DIGIT_BIT)) + 1))

/*
 * MP_WUR - warn unused result
 * ---------------------------
 *
 * The result of functions annotated with MP_WUR must be
 * checked and cannot be ignored.
 *
 * Most functions in libtommath return an error code.
 * This error code must be checked in order to prevent crashes or invalid
 * results.
 *
 * If you still want to avoid the error checks for quick and dirty programs
 * without robustness guarantees, you can `#define MP_WUR` before including
 * tommath.h, disabling the warnings.
 */
#ifndef MP_WUR
#  if defined(__GNUC__) && __GNUC__ >= 4
#     define MP_WUR __attribute__((warn_unused_result))
#  else
#     define MP_WUR
#  endif
#endif

#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 301)
#  define MP_DEPRECATED(x) __attribute__((deprecated("replaced by " #x)))
#  define PRIVATE_MP_DEPRECATED_PRAGMA(s) _Pragma(#s)
#  define MP_DEPRECATED_PRAGMA(s) PRIVATE_MP_DEPRECATED_PRAGMA(GCC warning s)
#elif defined(_MSC_VER) && _MSC_VER >= 1500
#  define MP_DEPRECATED(x) __declspec(deprecated("replaced by " #x))
#  define MP_DEPRECATED_PRAGMA(s) __pragma(message(s))
#else
#  define MP_DEPRECATED
#  define MP_DEPRECATED_PRAGMA(s)
#endif

#define USED(m)    ((m)->used)
#define DIGIT(m,k) ((m)->dp[(k)])
#define SIGN(m)    ((m)->sign)

/* the infamous mp_int structure */
#ifndef MP_INT_DECLARED
#define MP_INT_DECLARED
typedef struct mp_int mp_int;
#endif
struct mp_int {
   int used, alloc, sign;
   mp_digit *dp;
};

/* callback for mp_prime_random, should fill dst with random bytes and return how many read [upto len] */
typedef int ltm_prime_callback(unsigned char *dst, int len, void *dat);






/* error code to char* string */
const char *mp_error_to_string(int code);

/* ---> init and deinit bignum functions <--- */
/* init a bignum */
/*
int mp_init(mp_int *a);

#define XFREE(mem, size)                TclBNFree(mem)
#define XREALLOC(mem, oldsize, newsize) TclBNRealloc(mem, newsize)


/* Rename the global symbols in libtommath to avoid linkage conflicts */

#define bn_reverse TclBN_reverse
#define s_mp_reverse TclBN_reverse
#define fast_s_mp_mul_digs TclBN_fast_s_mp_mul_digs
#define s_mp_mul_digs_fast TclBN_fast_s_mp_mul_digs
#define fast_s_mp_sqr TclBN_fast_s_mp_sqr
#define s_mp_sqr_fast TclBN_fast_s_mp_sqr
#define mp_add TclBN_mp_add
#define mp_add_d TclBN_mp_add_d
#define mp_and TclBN_mp_and
#define mp_clamp TclBN_mp_clamp
#define mp_clear TclBN_mp_clear
#define mp_clear_multi TclBN_mp_clear_multi
#define mp_cmp TclBN_mp_cmp

#define mp_init TclBN_mp_init
#define mp_init_copy TclBN_mp_init_copy
#define mp_init_multi TclBN_mp_init_multi
#define mp_init_set TclBN_mp_init_set
#define mp_init_set_int TclBN_mp_init_set_int
#define mp_init_size TclBN_mp_init_size
#define mp_karatsuba_mul TclBN_mp_karatsuba_mul
#define s_mp_karatsuba_mul TclBN_mp_karatsuba_mul
#define mp_karatsuba_sqr TclBN_mp_karatsuba_sqr
#define s_mp_karatsuba_sqr TclBN_mp_karatsuba_sqr
#define mp_lshd TclBN_mp_lshd
#define mp_mod TclBN_mp_mod
#define mp_mod_2d TclBN_mp_mod_2d
#define mp_mul TclBN_mp_mul
#define mp_mul_2 TclBN_mp_mul_2
#define mp_mul_2d TclBN_mp_mul_2d
#define mp_mul_d TclBN_mp_mul_d

#define mp_tc_and TclBN_mp_tc_and
#define mp_tc_div_2d TclBN_mp_tc_div_2d
#define mp_tc_or TclBN_mp_tc_or
#define mp_tc_xor TclBN_mp_tc_xor
#define mp_to_unsigned_bin TclBN_mp_to_unsigned_bin
#define mp_to_unsigned_bin_n TclBN_mp_to_unsigned_bin_n
#define mp_toom_mul TclBN_mp_toom_mul
#define s_mp_toom_mul TclBN_mp_toom_mul
#define mp_toom_sqr TclBN_mp_toom_sqr
#define s_mp_toom_sqr TclBN_mp_toom_sqr
#define mp_toradix_n TclBN_mp_toradix_n
#define mp_unsigned_bin_size TclBN_mp_unsigned_bin_size
#define mp_xor TclBN_mp_xor
#define mp_zero TclBN_mp_zero
#define s_mp_add TclBN_s_mp_add
#define s_mp_mul_digs TclBN_s_mp_mul_digs
#define s_mp_sqr TclBN_s_mp_sqr

    /*
     * Store the magnitude in the bignum.
     */

    p = a->dp;
    while (v) {
	*p++ = (mp_digit) (v & MP_MASK);
	v >>= MP_DIGIT_BIT;
    }
    a->used = p - a->dp;
}

/*
 *----------------------------------------------------------------------
 *

    /*
     * Store the magnitude in the bignum.
     */

    p = a->dp;
    while (v) {
	*p++ = (mp_digit) (v & MP_MASK);
	v >>= MP_DIGIT_BIT;
    }
    a->used = p - a->dp;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */