/* gcc test-wm-class.c -o test-wm-class -lX11 */

/* Normally you'd use XSetClassHint() to set WM_CLASS, which ensures
that it consists of 2 null terminated strings, but some applications don't
and we must handle malformed WM_CLASS safely */

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>

#include <X11/Xlib.h>
#include <X11/Xatom.h>

Display *d;


void test(unsigned char *buffer, unsigned int buffer_length)
{
  Window w;

  w = XCreateWindow(d, RootWindow(d, DefaultScreen(d)), 0, 0, 200, 200, 0,
                    CopyFromParent, InputOutput, CopyFromParent, 0, 0);

  Atom wm_class = XInternAtom(d, "WM_CLASS", False);

  XChangeProperty(d, w, wm_class, XA_STRING, 8, PropModeReplace, buffer, buffer_length);

  XMapWindow(d, w);
  XFlush(d);
  sleep(1);
}

int main(int argc, char **argv)
{
    d = XOpenDisplay(0);

    test("", 0);
    test("\0", 1);
    test("\0\0", 2);

    test("foo", 3);
    test("foo\0", 4);
    test("foo\0b", 5);
    test("foo\0bar", 7);
    test("foo\0bar\0", 8);

    while(1) sleep(1);
}