+function common_shorten_links($text, $always = false)
+{
+ common_debug("common_shorten_links() called");
+
+ $user = common_current_user();
+
+ $maxLength = User_urlshortener_prefs::maxNoticeLength($user);
+
+ common_debug("maxLength = $maxLength");
+
+ if ($always || mb_strlen($text) > $maxLength) {
+ common_debug("Forcing shortening");
+ return common_replace_urls_callback($text, array('File_redirection', 'forceShort'));
+ } else {
+ common_debug("Not forcing shortening");
+ return common_replace_urls_callback($text, array('File_redirection', 'makeShort'));
+ }
+}
+
+/**
+ * Very basic stripping of invalid UTF-8 input text.
+ *
+ * @param string $str
+ * @return mixed string or null if invalid input
+ *
+ * @todo ideally we should drop bad chars, and maybe do some of the checks
+ * from common_xml_safe_str. But we can't strip newlines, etc.
+ * @todo Unicode normalization might also be useful, but not needed now.
+ */
+function common_validate_utf8($str)