+
+/*
+ * we mark the ampersand with \007 when converting text->html
+ * because after text->html we do hyperlink detecting, which
+ * could be screwed up by the ampersand.
+ * ie. 1<3 ==> 1\007lt;3
+ */
+#define MARK_AMP '\007'
+#define MARK_AMP_STR "\007"
+
+/* mark & separately, because they are parts of urls.
+ * ie. a&b => a\006amp;b, but a>b => a\007gt;b
+ *
+ * we need to handle '&' separately, because it can be part of URIs
+ * (as in href="http://foo.bar?a=1&b=1"), so inside those URIs
+ * we need to re-replace \006amp; with '&' again, while outside uri's
+ * it will be '&'
+ *
+ * yes, it's messy, but a consequence of doing text->html first, then hyperlinkify
+ */
+#define MARK_AMP_URI '\006'
+#define MARK_AMP_URI_STR "\006"
+
+