diff --git a/poppler/Function.cc b/poppler/Function.cc
index 73a6b5f..389265f 100644
--- a/poppler/Function.cc
+++ b/poppler/Function.cc
@@ -13,6 +13,7 @@
 // All changes made under the Poppler project to this file are licensed
 // under GPL version 2 or later
 //
+// Copyright (C) 2010 Thomas Freitag <Thomas.Freitag@alfa.de>
 // Copyright (C) 2006, 2008, 2009 Albert Astals Cid <aacid@kde.org>
 // Copyright (C) 2006 Jeff Muizelaar <jeff@infidigm.net>
 //
@@ -49,6 +50,13 @@
 //------------------------------------------------------------------------
 
 Function::Function() {
+	int c;
+	for (c = 0; c < funcMaxInputs; c++) {
+		domain[0][0] = 0.0;
+		domain[0][1] = 1.0;
+		range[0][0] = 0.0;
+		range[0][1] = 1.0;
+	}
 }
 
 Function::~Function() {
@@ -1012,11 +1020,13 @@ void PSStack::roll(int n, int j) {
     }
   } else {
     j = n - j;
-    obj = stack[sp + n - 1];
-    for (k = sp + n - 1; k > sp; --k) {
-      stack[k] = stack[k-1];
-    }
-    stack[sp] = obj;
+    for (i = 0; i < j; ++i) {
+		obj = stack[sp + n - 1];
+		for (k = sp + n - 1; k > sp; --k) {
+		  stack[k] = stack[k-1];
+		}
+		stack[sp] = obj;
+	}
   }
 }