From http://www.jwz.org/xscreensaver/xscreensaver-5.16.tar.gz

[xscreensaver] / utils / textclient.h

diff --git a/utils/textclient.h b/utils/textclient.h
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+/* xscreensaver, Copyright (c) 2012 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.
+ *
+ * Running "xscreensaver-text" and returning bytes from it.
+ */
+
+#ifndef __TEXTCLIENT_H__
+#define __TEXTCLIENT_H__
+
+# ifdef USE_IPHONE
+#  undef HAVE_FORKPTY
+# endif
+
+typedef struct text_data text_data;
+
+extern text_data *textclient_open (Display *);
+extern void textclient_close (text_data *);
+extern void textclient_reshape (text_data *,
+                                int pix_w, int pix_h,
+                                int char_w, int char_h);
+extern int textclient_getc (text_data *);
+extern Bool textclient_putc (text_data *, XKeyEvent *);
+
+#endif /* __TEXTCLIENT_H__ */