[evolution-data-server] ECalRecur: Convert intervals < 1 into the default (1)

[Carlos Martín Nieto <cmartin src gnome org>]

commit ae8dad07c8c9b842d4f79aaabc611257ea0f0717
Author: Carlos Martín Nieto <carlos cmartin tk>
Date:   Mon Feb 21 16:55:32 2011 +0100

    ECalRecur: Convert intervals < 1 into the default (1)
    
    Negative intervals have been spotted in the wild. An interval lower
    than 1 doesn't make any sense and is against the standard, so if we
    see one, we replace it by the default interval of 1.

 calendar/libecal/e-cal-recur.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/calendar/libecal/e-cal-recur.c b/calendar/libecal/e-cal-recur.c
index 3c30618..11fc119 100644
--- a/calendar/libecal/e-cal-recur.c
+++ b/calendar/libecal/e-cal-recur.c
@@ -996,7 +996,14 @@ e_cal_recur_from_icalproperty (icalproperty *prop, gboolean exception,
 		ir = icalproperty_get_rrule (prop);
 
 	r->freq = ir.freq;
-	r->interval = ir.interval;
+
+	if(G_UNLIKELY(ir.interval < 1)){
+		g_warning("Invalid interval in rule %s - using 1\n",
+			icalrecurrencetype_as_string(&ir));
+		r->interval = 1;
+	} else {
+		r->interval = ir.interval;
+	}
 
   r->enddate = e_cal_recur_obtain_enddate (&ir, prop, zone, convert_end_date);