#include <stdint.h>
#include <xcb/xcb.h>
#include <xkbcommon/xkbcommon.h>
#include <xkbcommon/xkbcommon-names.h>

uint32_t
keymaplookup(struct xkb_state *state, uint8_t keycode, uint16_t corestate)
{
	static const char *modname[] = {
		XKB_MOD_NAME_SHIFT,
		XKB_MOD_NAME_CAPS,
		XKB_MOD_NAME_CTRL,
		XKB_MOD_NAME_MOD1,
		XKB_MOD_NAME_MOD2,
		XKB_MOD_NAME_MOD3,
		XKB_MOD_NAME_MOD4,
		XKB_MOD_NAME_MOD5,
	};
	struct xkb_keymap *keymap;
	xkb_mod_index_t index;
	xkb_mod_mask_t mods;
	int i;

	if(state == NULL)
		return XKB_KEY_NoSymbol;
	keymap = xkb_state_get_keymap(state);
	mods = 0;
	for(i = 0; i < (int)(sizeof modname / sizeof modname[0]); i++){
		if(!(corestate & (1U << i)))
			continue;
		index = xkb_keymap_mod_get_index(keymap, modname[i]);
		if(index != XKB_MOD_INVALID && index < 8 * sizeof mods)
			mods |= (xkb_mod_mask_t)1 << index;
	}
	xkb_state_update_mask(state, mods, 0, 0, 0, 0,
		(corestate >> 13) & 3);
	return xkb_state_key_get_one_sym(state, keycode);
}