From: Glenn Morris <rgm@gnu.org>
Date: Thu, 2 Apr 2009 06:33:18 +0000 (+0000)
Subject: (diary-cyclic): Check for +ve N.
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(diary-cyclic): Check for +ve N.
---

diff --git a/lisp/calendar/diary-lib.el b/lisp/calendar/diary-lib.el
index 57f18f69137..0081170d8ac 100644
--- a/lisp/calendar/diary-lib.el
+++ b/lisp/calendar/diary-lib.el
@@ -1912,6 +1912,8 @@ and %s by the ordinal ending of that number (that is, `st', `nd',
 
 An optional parameter MARK specifies a face or single-character
 string to use when highlighting the day in the calendar."
+  (or (> n 0)
+      (error "Day count must be positive"))
   (let* ((diff (- (calendar-absolute-from-gregorian date)
                   (calendar-absolute-from-gregorian
                    (diary-make-date month day year))))