--- loncom/homework/response.pm	2004/09/27 22:47:49	1.105
+++ loncom/homework/response.pm	2004/12/23 22:53:41	1.112
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # various response type definitons response definition
 #
-# $Id: response.pm,v 1.105 2004/09/27 22:47:49 albertel Exp $
+# $Id: response.pm,v 1.112 2004/12/23 22:53:41 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -124,11 +124,17 @@ sub setrandomnumber {
 	if (defined($Apache::inputtags::response[-1])) {
 	    $rndmod+=&Apache::lonnet::numval($Apache::inputtags::response[-1]);
 	}
-    } else {
+    } elsif ($rand_alg eq '64bit3') {
 	$rndmod=(&Apache::lonnet::numval2($Apache::inputtags::part) << 10);
 	if (defined($Apache::inputtags::response[-1])) {
 	    $rndmod+=&Apache::lonnet::numval2($Apache::inputtags::response[-1]);
 	}
+    } else {
+	my $shift=(4*scalar(@Apache::inputtags::responselist))%30;
+	$rndmod=(&Apache::lonnet::numval3($Apache::inputtags::part) << (($shift+15)%30));
+	if (defined($Apache::inputtags::response[-1])) {
+	    $rndmod+=(&Apache::lonnet::numval3($Apache::inputtags::response[-1]) << $shift );
+	}
     }
     if ($rndseed =~/([,:])/) {
 	my $char=$1;
@@ -136,12 +142,17 @@ sub setrandomnumber {
 	my ($num1,$num2)=split(/\Q$char\E/,$rndseed);
 	$num1+=$rndmod;
 	$num2+=$rndmod;
+	if($Apache::lonnet::_64bit) { $num1=(($num1<<32)>>32); $num2=(($num2<<32)>>32); }
 	$rndseed=$num1.$char.$num2;
     } else {
 	$rndseed+=$rndmod;
+	if($Apache::lonnet::_64bit) {
+	    use integer;
+	    $rndseed=(($rndseed<<32)>>32);
+	}
     }
+    &Apache::lonxml::debug("randseed $rndmod $rndseed");
     &Apache::lonnet::setup_random_from_rndseed($rndseed);
-    &Apache::lonxml::debug("randseed $rndseed");
     return '';
 }
 
@@ -268,10 +279,11 @@ sub handle_previous {
     if ($$previous{'used'} && ($$previous{'award'} eq $ad) ) {
 	if ($$previous{'last'}) {
 	    push(@Apache::inputtags::previous,'PREVIOUSLY_LAST');
-	} else {
+	    push(@Apache::inputtags::previous_version,$$previous{'version'});
+	} elsif ($Apache::lonhomework::type ne 'survey') {
 	    push(@Apache::inputtags::previous,'PREVIOUSLY_USED');
+	    push(@Apache::inputtags::previous_version,$$previous{'version'});
 	}
-	push(@Apache::inputtags::previous_version,$$previous{'version'});
     }
 }
 
@@ -507,6 +519,7 @@ sub showallfoils {
 	    return 1;
 	}
     }
+    if ($Apache::lonhomework::type eq 'survey') { return 1; }
     return 0;
 }
 
@@ -646,7 +659,7 @@ sub analyze_store_foilgroup {
 sub check_if_computed {
     my ($token,$parstack,$safeeval,$name)=@_;
     my $value = &Apache::lonxml::get_param($name,$parstack,$safeeval);
-    if ($value ne $token->[2]{$name}) {
+    if (ref($token->[2]) eq 'HASH' && $value ne $token->[2]{$name}) {
 	my $part_id="$Apache::inputtags::part.$Apache::inputtags::response[-1]";
 	$Apache::lonhomework::analyze{"$part_id.answercomputed"} = 1;
     }