stash undo3

abuf.c

@@ -71,6 +71,13 @@ ab_append(abuf *buf, const char *s, size_t len)
 }
 
 
+void
+ab_append_ab(abuf *buf, const abuf *other)
+{
+	ab_append(buf, other->b, other->size);
+}
+
+
 void
 ab_prependch(abuf *buf, const char c)
 {