Index: uspace/lib/c/include/str.h
===================================================================
--- uspace/lib/c/include/str.h	(revision 9c2c7d2247cc1ad0410cd61ab534af9a246d328b)
+++ uspace/lib/c/include/str.h	(revision 94c05b89b35e97bd16e44d00f32fdf77dcd0470c)
@@ -99,4 +99,5 @@
 extern int utf16_to_str(char *dest, size_t size, const uint16_t *src);
 extern int str_to_utf16(uint16_t *dest, size_t dlen, const char *src);
+extern size_t utf16_wsize(const uint16_t *ustr);
 
 extern char *str_chr(const char *str, wchar_t ch);