Programming key table

// Key table source excerpt

KeySym CortronKeyMap[] = {
    XK_KP_Space,    NoSymbol,   NoSymbol,   NoSymbol,   // 00   // 11 80
    XK_Help,    NoSymbol,   NoSymbol,   NoSymbol,       // 71 81
    XK_Execute, NoSymbol,   NoSymbol,   NoSymbol,       // 71 82
// ...
    XK_Delete,  NoSymbol,   NoSymbol,   NoSymbol,       // 10 FF
};

#define Alt_Mask Mod3Mask
CARD8 ctrnModmap[][2] = {
        {94,     ShiftMask},
        {95,     ShiftMask},
        {15,     ControlMask},
        {10,     Alt_Mask},
         {0,     0}
};
KeySymsRec ctrnKeySyms[] = {    {CortronKeyMap, 0, 0x7f, 4}   };


// Code to program key table

static CARD8 *ctrn_workingModMap = NULL;
static KeySymsRec *ctrn_workingKeySyms = NULL;

static Bool decinput_set_cortron_keymap_cb(ClientPtr client, pointer closure)
{
    set_keymap_t *pc = closure;
    XkbApplyMappingChange(pc->dev, ctrn_workingKeySyms,
            ctrn_workingKeySyms->minKeyCode,
            ctrn_workingKeySyms->maxKeyCode - ctrn_workingKeySyms->minKeyCode + 1,
            ctrn_workingModMap, serverClient);
   free(pc);
   return TRUE;
}


static int decinput_set_cortron_keymap(InputInfoPtr pInfo)
{
    int i;
    DeviceIntPtr dev = pInfo->dev;
    set_keymap_t *pc = calloc(1, sizeof(set_keymap_t));
    if (!pc) return !Success;

    if (!ctrn_workingKeySyms) {
        ctrn_workingKeySyms = &ctrnKeySyms[0];

        if (ctrn_workingKeySyms->minKeyCode < MIN_KEYCODE) {
            ctrn_workingKeySyms->minKeyCode += MIN_KEYCODE;
            ctrn_workingKeySyms->maxKeyCode += MIN_KEYCODE;
        }
        if (ctrn_workingKeySyms->maxKeyCode > MAX_KEYCODE)
            ctrn_workingKeySyms->maxKeyCode = MAX_KEYCODE;
    }
    if (!ctrn_workingModMap) {
        ctrn_workingModMap=(CARD8 *)malloc(MAP_LENGTH);
        if (!ctrn_workingModMap) {
            //ErrorF("ctrnKbdProc failed: could not alloc modmap \n");
            return (!Success);
        }
        (void) memset(ctrn_workingModMap, 0, MAP_LENGTH);
        for(i=0; ctrnModmap[i][0] != 0; i++) {
            ctrn_workingModMap[(ctrnModmap[i][0]) + MIN_KEYCODE] = ctrnModmap[i][1];
        }
    }

    pc->dev = dev;
    QueueWorkProc(decinput_set_cortron_keymap_cb, serverClient, pc);
    return Success;
}