#include <X11/Xlib.h>
//#include <X11/Xutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
//#include <math.h>
#include <stdarg.h>

#include <X11/XKBlib.h>

void error(char *format, ...)
{
	va_list ap;
	va_start(ap, format);
	vfprintf(stderr, format, ap);
	va_end(ap);
	exit(1);
}

void warning(char *format, ...)
{
	va_list ap;
	va_start(ap, format);
	vfprintf(stderr, format, ap);
	va_end(ap);
}

void show_keysym_for_event(Display *display, XEvent event)
{
	KeySym keysym;
	switch (event.type) {
		case KeyPress:
			keysym = XkbKeycodeToKeysym(display, event.xkey.keycode, 0, event.xkey.state & ShiftMask ? 1 : 0);
			printf("%d %d %s\n", event.xkey.keycode, event.xkey.state, XKeysymToString(keysym));
			break;
		default:
			warning("unhandled event, type: 0x%04x\n", event.type);
			break;
	}
}

int main(int argc, char **argv)
{
	Window root, window;
	Display *display;
	int screen_number;
	long black, white;

	if ((display = XOpenDisplay(NULL)) == NULL)
		error("cannot open display\n");

	screen_number = DefaultScreen(display);
	white = WhitePixel(display, screen_number);
	black = BlackPixel(display, screen_number);

	root = DefaultRootWindow(display);
	window = XCreateSimpleWindow(
		display, root, 0, 0, 10, 10, 0,
		white, black);
	XSelectInput(display, window, KeyPressMask);
	XMapWindow(display, window);

	while (1) {
		XEvent event;
		XNextEvent(display, &event);
		show_keysym_for_event(display, event);
	}

	XUnmapWindow(display, window);
	XDestroyWindow(display, window);
	XCloseDisplay(display);
	exit(0);
}