Fix generator to cope with call-by-ref long types

From: Matthias Bolte <matthias.bolte@googlemail.com>
Tested-by: NJim Fehlig <jfehlig@novell.com>

Matthias provided this patch to fix an issue I encountered in the
generator with APIs containing call-by-ref long type, e.g.

int virDomainMigrateGetMaxSpeed(virDomainPtr domain,
                                unsigned long *bandwidth,
                                unsigned int flags);

src/rpc/gendispatch.pl

@@ -640,10 +640,11 @@ elsif ($opt_b) {
                 } elsif ($ret_member =~ m/^(?:unsigned )?hyper (\S+)<\S+>;/) {
                     # error out on unannotated arrays
                     die "hyper array without insert@<offset> annotation: $ret_member";
-                } elsif ($ret_member =~ m/^(unsigned )?hyper (\S+);/) {
+                } elsif ($ret_member =~ m/^(unsigned )?hyper (\S+);(?:\s*\/\*\s*insert@(\d+)\s*\*\/)?/) {
                     my $type_name = $1;
                     my $ret_name = $2;
                     my $ret_assign;
+                    my $insert = $3;
 
                     if (hyper_to_long($call->{ProcName}, "ret", $ret_name)) {
                         my $sign = ""; $sign = "U" if ($1);
@@ -657,7 +658,13 @@ elsif ($opt_b) {
 
                     push(@vars_list, "$type_name $ret_name");
                     push(@ret_list, $ret_assign);
-                    $single_ret_var = $ret_name;
+
+                    if ($insert) {
+                        splice(@args_list, int($insert), 0, "&$ret_name");
+                        $single_ret_var = undef;
+                    } else {
+                        $single_ret_var = $ret_name;
+                    }
 
                     if ($call->{ProcName} eq "DomainGetMaxMemory" or
                         $call->{ProcName} eq "NodeGetFreeMemory") {
@@ -1283,6 +1290,24 @@ elsif ($opt_k) {
                         push(@ret_list, "rv = ret.$arg_name;");
                     }
 
+                    $single_ret_var = "int rv = -1";
+                    $single_ret_type = "int";
+                } elsif ($ret_member =~ m/^(unsigned )?hyper (\S+);\s*\/\*\s*insert@(\d+)\s*\*\//) {
+                    my $type_name = $1;
+                    my $sign = ""; $sign = "U" if ($1);
+                    my $ret_name = $2;
+                    my $insert = $3;
+
+                    if (hyper_to_long($call->{ProcName}, "ret", $ret_name)) {
+                        $type_name .= "long";
+                        push(@ret_list, "if ($ret_name) HYPER_TO_${sign}LONG(*$ret_name, ret.$ret_name);");
+                    } else {
+                        $type_name .= "long long";
+                        push(@ret_list, "if ($ret_name) *$ret_name = ret.$ret_name;");
+                    }
+
+                    splice(@args_list, int($insert), 0, ("$type_name *$ret_name"));
+                    push(@ret_list, "rv = 0;");
                     $single_ret_var = "int rv = -1";
                     $single_ret_type = "int";
                 } elsif ($ret_member =~ m/^unsigned hyper (\S+);/) {