avoid unnecessary copying

mapbox · Oct 4, 2016 · d4cb5a3 · d4cb5a3
1 parent b9c10e3
commit d4cb5a3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/platform/darwin/src/MGLMultiPoint.mm b/platform/darwin/src/MGLMultiPoint.mm
@@ -112,7 +112,7 @@ - (void)setCoordinates:(CLLocationCoordinate2D *)coords range:(NSRange)range
         // appending new coordinate(s)
         NSUInteger newCount = NSMaxRange(range);
         CLLocationCoordinate2D *newCoordinates = (CLLocationCoordinate2D *)malloc(newCount * sizeof(CLLocationCoordinate2D));
-        memcpy(newCoordinates, _coordinates, _count * sizeof(CLLocationCoordinate2D));
+        memcpy(newCoordinates, _coordinates, fmin(_count, range.location) * sizeof(CLLocationCoordinate2D));
         memcpy(newCoordinates + range.location, coords, range.length * sizeof(CLLocationCoordinate2D));
         [self setupWithCoordinates:newCoordinates count:newCount];
         free(newCoordinates);