+
+unsigned int utf8_hash_case_bytes (const char *, size_t n, unsigned int basis) WARN_UNUSED_RESULT;
+unsigned int utf8_hash_case_string (const char *, unsigned int basis) WARN_UNUSED_RESULT;
+unsigned int utf8_hash_case_substring (struct substring, unsigned int basis)
+ WARN_UNUSED_RESULT;
+int utf8_strcasecmp (const char *, const char *);
+int utf8_sscasecmp (struct substring, struct substring);
+int utf8_strncasecmp (const char *, size_t, const char *, size_t);
+int utf8_strverscasecmp (const char *, const char *);
+char *utf8_to_upper (const char *);
+char *utf8_to_lower (const char *);
+char *utf8_to_title (const char *);