xkb layout switcher

xkbgroup.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/XKBlib.h>

int main(int argc, char **argv) {
    
    if (argc != 2) {
        printf("Usage: %s list|<match>\nMatch is lazy, the first layout beginning with the token is chosen\n", argv[0]);
        return False;
    }

    Display* dpy = XOpenDisplay(NULL);


    XkbDescRec* kbdDescPtr = XkbAllocKeyboard();
    if (!kbdDescPtr) {
        printf("Failed to get keyboard description.\n"); 
        return False;
    }
    kbdDescPtr->dpy = dpy;

    int deviceId = XkbUseCoreKbd;
/*     if (deviceId != XkbUseCoreKbd) {
        kbdDescPtr->device_spec = deviceId;
    } */

    XkbGetControls(dpy, XkbAllControlsMask, kbdDescPtr);
    XkbGetNames(dpy, XkbSymbolsNameMask|XkbGroupNamesMask, kbdDescPtr);

    Atom* groupSource = kbdDescPtr->names->groups;
    int groupCount = 0;
    if (kbdDescPtr->ctrls) {
        groupCount = kbdDescPtr->ctrls->num_groups;
    } else {
        while (groupCount < XkbNumKbdGroups && groupSource[groupCount]) {
            ++groupCount;
        }
    }

    Atom* tmpGroupSource = kbdDescPtr->names->groups;
    Atom curGroupAtom;
    char* groupName;
    int printList = (strncmp(argv[1], "list", 4) == 0);
    for (int i = 0; i < groupCount; i++) {
        if ((curGroupAtom = tmpGroupSource[i]) != None) {
            groupName = XGetAtomName(dpy, curGroupAtom);
            if (!groupName) {
                continue;
            }
            if (printList) {
                printf("%s\n", groupName);
            } else if (strncmp(argv[1], groupName, strlen(argv[1])) == 0) {
                printf ("Setting %s\n", groupName);
//                printf ("%d\n", i);
                XkbLockGroup(dpy, deviceId, i);
                XFree(groupName);
                XCloseDisplay(dpy);
                return True;
            }
            XFree(groupName);
        } 
    }
    XCloseDisplay(dpy);
    return printList;
}