1 files changed, 123 insertions, 0 deletions
diff --git a/driver/clientmsg.c b/driver/clientmsg.c
new file mode 100644
index 0000000..f3d9d71
--- /dev/null
+++ b/driver/clientmsg.c
@@ -0,0 +1,123 @@
+/* xscreensaver, Copyright © 1991-2021 Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xatom.h>
+
+#include "blurb.h"
+#include "atoms.h"
+#include "clientmsg.h"
+
+extern Bool verbose_p;
+
+static int
+error_handler (Display *dpy, XErrorEvent *error)
+{
+  return 0;
+}
+
+
+Window
+find_screensaver_window (Display *dpy, char **version)
+{
+  int i;
+  Window root = RootWindowOfScreen (DefaultScreenOfDisplay (dpy));
+  Window root2, parent, *kids;
+  unsigned int nkids;
+  XErrorHandler old_handler;
+  Window ret = 0;
+
+  XSync (dpy, False);
+  old_handler = XSetErrorHandler (error_handler);
+
+  if (version) *version = 0;
+
+  if (! XQueryTree (dpy, root, &root2, &parent, &kids, &nkids))
+    abort ();
+  if (root != root2)
+    abort ();
+  if (parent)
+    abort ();
+  if (! (kids && nkids))
+    goto DONE;
+  for (i = 0; i < nkids; i++)
+    {
+      Atom type;
+      int format;
+      unsigned long nitems, bytesafter;
+      unsigned char *v = 0;
+      int status;
+
+      /* We're walking the list of root-level windows and trying to find
+         the one that has a particular property on it.  We need to trap
+         BadWindows errors while doing this, because it's possible that
+         some random window might get deleted in the meantime.  (That
+         window won't have been the one we're looking for.)
+       */
+      status = XGetWindowProperty (dpy, kids[i],
+                                   XA_SCREENSAVER_VERSION,
+                                   0, 200, False, XA_STRING,
+                                   &type, &format, &nitems, &bytesafter,
+                                   &v);
+      if (status == Success && type != None)
+	{
+          ret = kids[i];
+	  if (version)
+	    *version = (char *) v;
+          else
+            XFree (v);
+          goto DONE;
+	}
+      if (v) XFree (v);
+    }
+
+ DONE:
+  if (kids) XFree (kids);
+  XSetErrorHandler (old_handler);
+  return ret;
+}
+
+
+void
+clientmessage_response (Display *dpy, XEvent *xev, Bool ok, const char *msg)
+{
+  char *proto;
+  int L = 0;
+
+  if (verbose_p || !ok)
+    {
+      Atom cmd = xev->xclient.data.l[0];
+      char *name = XGetAtomName (dpy, cmd);
+      fprintf (stderr, "%s: ClientMessage %s: %s\n", blurb(), 
+               (name ? name : "???"), msg);
+    }
+
+  L = strlen (msg);
+  proto = (char *) malloc (L + 2);
+  if (!proto) return;
+  proto[0] = (ok ? '+' : '-');
+  memcpy (proto+1, msg, L);
+  L++;
+  proto[L] = 0;
+
+  XChangeProperty (dpy, xev->xclient.window,
+                   XA_SCREENSAVER_RESPONSE, XA_STRING, 8,
+		   PropModeReplace, (unsigned char *) proto, L);
+  free (proto);
+}