//This is a neat program, it dump the x-windows clipboard to stdout.

//gcc -O2 -Wall t.c -o t -lXxf86vm

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

#define MAX_CLIP_SIZE        16384

Display *disp;
Window w;
Atom x11_clipboard;
char nothing;

char *clip_get(void) {
 unsigned char *xdata;
 Atom prop, type;
 unsigned long len, dummy;
 int fmt;
 if(!(x11_clipboard = XInternAtom(disp, "CLIPBOARD", True)))
  return &nothing;
 w = XGetSelectionOwner(disp, x11_clipboard);
 if(w==0) return &nothing;
 prop = 1;
 XChangeProperty(disp, w, prop, XA_STRING,
                 8, PropModeReplace, (unsigned char *)"", 0);
 XConvertSelection(disp,x11_clipboard, XA_STRING, prop, w, CurrentTime);
 XFlush(disp);
 XGetWindowProperty(disp, w, prop, 0, MAX_CLIP_SIZE,0,
                    AnyPropertyType, &type, &fmt, &len, &dummy, &xdata);
 if(len == 0) return &nothing;
 if(len>MAX_CLIP_SIZE) return &nothing;
 return xdata;
}

int main(void) {
 if(!(disp = XOpenDisplay(NULL))) {
  fprintf(stderr,"cannot open display\n");
  exit(-1);
 }
 nothing = 0;
 printf(clip_get());
}