+
+/* if the appended element turns out to have an embedded sep char, rewind
+and do the lazy-coded separate string method */
+
+if (!check || !Ustrchr(&list->s[start], sep))
+ return list;
+
+va_start(ap, fmt);
+g = string_vformat_trc(NULL, US __FUNCTION__, __LINE__,
+ STRING_SPRINTF_BUFFER_SIZE, SVFMT_REBUFFER|SVFMT_EXTEND, fmt, ap);
+va_end(ap);
+
+list->ptr = start;
+return string_append_listele_n(list, sep, g->s, g->ptr);