Xlib color text

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/X.h>
#include <X11/Xlib.h>

int main() {
  Display *dpy;
  Window rootwin;
  Window win;
  Colormap cmap;
  XEvent e;
  int scr;
  GC gc;

  if (!(dpy = XOpenDisplay(NULL))) {
    fprintf(stderr, "ERROR: could not open display\n");
    exit(1);
  }
  scr = DefaultScreen(dpy);
  rootwin = RootWindow(dpy, scr);
  cmap = DefaultColormap(dpy, scr);

  win = XCreateSimpleWindow(dpy, rootwin, 1, 1, 100, 50, 0,
                            BlackPixel(dpy, scr), BlackPixel(dpy, scr));
  XStoreName(dpy, win, "hello");
  gc = XCreateGC(dpy, win, 0, NULL);

  XSelectInput(dpy, win, ExposureMask | ButtonPressMask);
  XMapWindow(dpy, win);

    while (1) {
      XNextEvent(dpy, &e);

      if (e.type == Expose && e.xexpose.count < 1) {

        char buf[] = "Hello World\x01, Bye!\x02";
        char cleanBuf[strlen(buf)];
        memset(cleanBuf, 0, strlen(cleanBuf));
        char *copy = strdup(buf);
        char *delim = "\x01\x02";
        char *res = strtok(buf, delim);
        strcat(cleanBuf, res);
        unsigned long color1 = 0xff0000;
        unsigned long color2 = 0x00ff00;
        unsigned long color;
        int x = 10;
        while (res) {
          /* Figure out what delimiter was used */
          // Thanks to http://stackoverflow.com/a/12460511/1612432
          char deli = copy[res - buf + strlen(res)];
          if (deli == '\x01')
            color = color1;
          else if (deli == '\x02')
            color = color2;
          else
            color = 0xffffff;
          XSetForeground(dpy, gc, color);
          XDrawString(dpy, win, gc, x, 10, res, strlen(res));
          x += 50;
          res = strtok(0, delim);
          if (res)
            strcat(cleanBuf, res);
        }
        free(copy);

      } else if (e.type == ButtonPress)
        break;

    }

  XCloseDisplay(dpy);
  return 0;
}