--- a/src/lib/unichar.h	Sat Dec 08 15:42:25 2007 +0200
+++ b/src/lib/unichar.h	Sat Dec 08 15:45:17 2007 +0200
@@ -40,4 +40,11 @@
 int uni_utf8_to_decomposed_titlecase(const void *input, size_t max_len,
 				     buffer_t *output);
 
+/* If input contains only valid UTF-8 input, return it directly. If input
+   contains invalid UTF-8 input, write only valid UTF-8 characters to the
+   given buffer and return it. */
+const unsigned char *
+uni_utf8_get_valid_data(const unsigned char *input, size_t size,
+			buffer_t *tmpbuf, size_t *output_size_r);
+
 #endif