#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/keysym.h>
#include <X11/Xutil.h>

int
main(int argc, char *argv[]) {
	XEvent ev;
	Window root;
	Display *dpy;
	int screen, len, running;
	char text[512];

	if (!(dpy = XOpenDisplay(0))) {
		fprintf(stderr, "grab: cannot open display\n");
		exit(EXIT_FAILURE);
	}

	screen = DefaultScreen(dpy);
	root = RootWindow(dpy, screen);

	for (len = 1000; len; len--) {
		if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime) == GrabSuccess)
			break;
		usleep(1000);
	}

	if (!len) {
	    fprintf(stderr, "grab: cannot grab keyboard\n");
	    exit(EXIT_FAILURE);
	}

	XSync(dpy, False);
	
	text[0] = 0;
	while (running && !XNextEvent(dpy, &ev)) {
		if (ev.type == KeyPress) {
			KeySym ksym;
			char buf[32];

			len = strlen(text);
			XLookupString(&ev.xkey, buf, sizeof(buf), &ksym, 0);
			switch (ksym) {
				case XK_Return:
					printf("%s\n", text);
				case XK_Escape:
					running = 0;
					break;
				case XK_BackSpace:
					if (len)
					    text[--len] = 0;
					break;
				default:
					strncat(text, buf, sizeof(text));
			}
		}
	}

	XUngrabKeyboard(dpy, CurrentTime);
	XCloseDisplay(dpy);
	return 0;
}