+int utf32_is_grapheme_boundary(const uint32_t *s, size_t ns, size_t n);
+int utf32_is_word_boundary(const uint32_t *s, size_t ns, size_t n);
+
+utf32_iterator utf32_iterator_new(const uint32_t *s, size_t ns);
+void utf32_iterator_destroy(utf32_iterator it);
+
+size_t utf32_iterator_where(utf32_iterator it);
+int utf32_iterator_set(utf32_iterator it, size_t n);
+int utf32_iterator_advance(utf32_iterator it, size_t n);
+uint32_t utf32_iterator_code(utf32_iterator it);
+int utf32_iterator_grapheme_boundary(utf32_iterator it);
+int utf32_iterator_word_boundary(utf32_iterator it);
+void utf32_iterator_tailor_word_break(utf32_iterator it,
+ unicode_property_tailor *pt);
+
+uint32_t **utf32_word_split(const uint32_t *s, size_t ns, size_t *nwp,
+ unicode_property_tailor *wbreak);
+char **utf8_word_split(const char *s, size_t ns, size_t *nwp,
+ unicode_property_tailor *wbreak);
+
+/** @brief Convert 0-terminated UTF-32 to UTF-8
+ * @param s 0-terminated UTF-32 string
+ * @return 0-terminated UTF-8 string or 0 on error
+ *
+ * See utf32_to_utf8() for possible causes of errors.
+ */
+static inline char *utf32nt_to_utf8(const uint32_t *s) {
+ return utf32_to_utf8(s, utf32_len(s), 0);
+}
+
+/** @brief Convert 0-terminated UTF-8 to UTF-32
+ * @param s 0-terminated UTF-8 string
+ * @return 0-terminated UTF-32 string or 0 on error
+ *
+ * See utf8_to_utf32() for possible causes of errors.
+ */
+static inline uint32_t *utf8nt_to_utf32(const char *s) {
+ return utf8_to_utf32(s, strlen(s), 0);
+}