_XkbBell(ClientPtr client, DeviceIntPtr dev, WindowPtr pWin,
         int bellClass, int bellID, int pitch, int duration,
         int percent, int forceSound, int eventOnly, Atom name)
{
    int base;
    void *ctrl;
    int oldPitch, oldDuration;
    int newPercent;

    if (bellClass == KbdFeedbackClass) {
        KbdFeedbackPtr k;

        if (bellID == XkbDfltXIId)
            k = dev->kbdfeed;
        else {
            for (k = dev->kbdfeed; k; k = k->next) {
                if (k->ctrl.id == bellID)
                    break;
            }
        }
        if (!k) {
            client->errorValue = _XkbErrCode2(0x5, bellID);
            return BadValue;
        }
        base = k->ctrl.bell;
        ctrl = (void *) &(k->ctrl);
        oldPitch = k->ctrl.bell_pitch;
        oldDuration = k->ctrl.bell_duration;
        if (pitch != 0) {
            if (pitch == -1)
                k->ctrl.bell_pitch = defaultKeyboardControl.bell_pitch;
            else
                k->ctrl.bell_pitch = pitch;
        }
        if (duration != 0) {
            if (duration == -1)
                k->ctrl.bell_duration = defaultKeyboardControl.bell_duration;
            else
                k->ctrl.bell_duration = duration;
        }
    }
    else if (bellClass == BellFeedbackClass) {
        BellFeedbackPtr b;

        if (bellID == XkbDfltXIId)
            b = dev->bell;
        else {
            for (b = dev->bell; b; b = b->next) {
                if (b->ctrl.id == bellID)
                    break;
            }
        }
        if (!b) {
            client->errorValue = _XkbErrCode2(0x6, bellID);
            return BadValue;
        }
        base = b->ctrl.percent;
        ctrl = (void *) &(b->ctrl);
        oldPitch = b->ctrl.pitch;
        oldDuration = b->ctrl.duration;
        if (pitch != 0) {
            if (pitch == -1)
                b->ctrl.pitch = defaultKeyboardControl.bell_pitch;
            else
                b->ctrl.pitch = pitch;
        }
        if (duration != 0) {
            if (duration == -1)
                b->ctrl.duration = defaultKeyboardControl.bell_duration;
            else
                b->ctrl.duration = duration;
        }
    }
    else {
        client->errorValue = _XkbErrCode2(0x7, bellClass);
        return BadValue;
    }

    newPercent = (base * percent) / 100;
    if (percent < 0)
        newPercent = base + newPercent;
    else
        newPercent = base - newPercent + percent;

    XkbHandleBell(forceSound, eventOnly,
                  dev, newPercent, ctrl, bellClass, name, pWin, client);
    if ((pitch != 0) || (duration != 0)) {
        if (bellClass == KbdFeedbackClass) {
            KbdFeedbackPtr k;

            k = (KbdFeedbackPtr) ctrl;
            if (pitch != 0)
                k->ctrl.bell_pitch = oldPitch;
            if (duration != 0)
                k->ctrl.bell_duration = oldDuration;
        }
        else {
            BellFeedbackPtr b;

            b = (BellFeedbackPtr) ctrl;
            if (pitch != 0)
                b->ctrl.pitch = oldPitch;
            if (duration != 0)
                b->ctrl.duration = oldDuration;
        }
    }

    return Success;
}
Unknown