+
+/**
+ * g_utf8_strreverse:
+ * @str: a UTF-8 encoded string
+ * @len: the maximum length of @str to use, in bytes. If @len < 0,
+ * then the string is nul-terminated.
+ *
+ * Reverses a UTF-8 string. @str must be valid UTF-8 encoded text.
+ * (Use g_utf8_validate() on all text before trying to use UTF-8
+ * utility functions with it.)
+ *
+ * This function is intended for programmatic uses of reversed strings.
+ * It pays no attention to decomposed characters, combining marks, byte
+ * order marks, directional indicators (LRM, LRO, etc) and similar
+ * characters which might need special handling when reversing a string
+ * for display purposes.
+ *
+ * Note that unlike g_strreverse(), this function returns
+ * newly-allocated memory, which should be freed with g_free() when
+ * no longer needed.
+ *
+ * Returns: a newly-allocated string which is the reverse of @str
+ *
+ * Since: 2.2
+ */
+gchar *
+g_utf8_strreverse (const gchar *str,
+ gssize len)
+{
+ gchar *r, *result;
+ const gchar *p;
+
+ if (len < 0)
+ len = strlen (str);
+
+ result = g_new (gchar, len + 1);
+ r = result + len;
+ p = str;
+ while (r > result)
+ {
+ gchar *m, skip = g_utf8_skip[*(guchar*) p];
+ r -= skip;
+ for (m = r; skip; skip--)
+ *m++ = *p++;
+ }
+ result[len] = 0;
+
+ return result;
+}
+
+
+gchar *
+_g_utf8_make_valid (const gchar *name)
+{
+ GString *string;
+ const gchar *remainder, *invalid;
+ gint remaining_bytes, valid_bytes;
+
+ g_return_val_if_fail (name != NULL, NULL);
+
+ string = NULL;
+ remainder = name;
+ remaining_bytes = strlen (name);
+
+ while (remaining_bytes != 0)
+ {
+ if (g_utf8_validate (remainder, remaining_bytes, &invalid))
+ break;
+ valid_bytes = invalid - remainder;
+
+ if (string == NULL)
+ string = g_string_sized_new (remaining_bytes);
+
+ g_string_append_len (string, remainder, valid_bytes);
+ /* append U+FFFD REPLACEMENT CHARACTER */
+ g_string_append (string, "\357\277\275");
+
+ remaining_bytes -= valid_bytes + 1;
+ remainder = invalid + 1;
+ }
+
+ if (string == NULL)
+ return g_strdup (name);
+
+ g_string_append (string, remainder);
+
+ g_assert (g_utf8_validate (string->str, -1, NULL));
+
+ return g_string_free (string, FALSE);
+}