How to map a X11 KeySym to a Unicode character?

Question

This is an exact duplicate of this question; however the code linked in the accepted answer is nearly 11 years old, and this comment in the code leads to my duplicate questi

Answer 1

This may help somebody... adapted from xmodmap source and online doc (http://tronche.com/gui/x/xlib/utilities/keyboard/XKeycodeToKeysym.html)

KeySym ks = XKeycodeToKeysym(dpy, keycode+min_keycode, modifier);
const char *s;
if (ks != NoSymbol)
    s = XKeysymToString (ks);
else {
    printf("Keycode has no symbol. Ignored.\n");
    return NULL;
}

printf ("0x%04x (%s)\n", (unsigned int)ks, s);
printf ("wide char:%lc\n", (wchar_t)ks);

Keysym is already the UTF value. The problem would be to set keycombinations... 'á' for example.