From http://www.jwz.org/xscreensaver/xscreensaver-5.31.tar.gz

[xscreensaver] / utils / utf8wc.h

diff --git a/utils/utf8wc.h b/utils/utf8wc.h
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+/* xscreensaver, Copyright (c) 2014 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.
+ */
+
+#ifndef __XSCREENSAVER_UTF8WC_H__
+#define __XSCREENSAVER_UTF8WC_H__
+
+/* Utilities for converting between UTF8 and XChar2b. */
+
+/* Converts a null-terminated UTF8 string to a null-terminated XChar2b array.
+   This only handles characters that can be represented in 16 bits, the
+   Basic Multilingual Plane. (No hieroglyphics, Elvish, Klingon or Emoji.)
+ */
+extern XChar2b * utf8_to_XChar2b (const char *, int *length_ret);
+
+/* Converts a null-terminated XChar2b array to a null-terminated UTF8 string.
+ */
+extern char *    XChar2b_to_utf8 (const XChar2b *, int *length_ret);
+
+/* Split a UTF8 string into an array of strings, one per character.
+   The sub-strings will be null terminated and may be multiple bytes.
+ */
+extern char ** utf8_split (const char *string, int *length_ret);
+
+/* Converts a UTF8 string to the closest Latin1 or ASCII equivalent.
+ */
+extern char *utf8_to_latin1 (const char *string, Bool ascii_p);
+
+#endif /* __XSCREENSAVER_UTF8WC_H__ */