From e2469e37488fe46257f1f4f4f8b0ebe11c08da47 Mon Sep 17 00:00:00 2001
From: Jelmer Vernooij <jelmer@samba.org>
Date: Sun, 1 Mar 2009 17:09:07 +0100
Subject: [PATCH] Don't generate array iterators when the length of the array
 is always 0. (bug #6140)

---
 pidl/lib/Parse/Pidl/Samba4/NDR/Parser.pm | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/pidl/lib/Parse/Pidl/Samba4/NDR/Parser.pm b/pidl/lib/Parse/Pidl/Samba4/NDR/Parser.pm
index 0e4a7e22894..34aebc7f0fb 100644
--- a/pidl/lib/Parse/Pidl/Samba4/NDR/Parser.pm
+++ b/pidl/lib/Parse/Pidl/Samba4/NDR/Parser.pm
@@ -586,9 +586,15 @@ sub ParseElementPushLevel
 		my $length = ParseExpr($l->{LENGTH_IS}, $env, $e->{ORIGINAL});
 		my $counter = "cntr_$e->{NAME}_$l->{LEVEL_INDEX}";
 
+		my $array_pointless = ($length eq "0");
+
+		if ($array_pointless) {
+			warning($e->{ORIGINAL}, "pointless array `$e->{NAME}' will always have size 0");
+		}
+
 		$var_name = get_array_element($var_name, $counter);
 
-		if (($primitives and not $l->{IS_DEFERRED}) or ($deferred and $l->{IS_DEFERRED})) {
+		if ((($primitives and not $l->{IS_DEFERRED}) or ($deferred and $l->{IS_DEFERRED})) and not $array_pointless) {
 			$self->pidl("for ($counter = 0; $counter < $length; $counter++) {");
 			$self->indent;
 			$self->ParseElementPushLevel($e, GetNextLevel($e, $l), $ndr, $var_name, $env, 1, 0);
@@ -596,7 +602,7 @@ sub ParseElementPushLevel
 			$self->pidl("}");
 		}
 
-		if ($deferred and ContainsDeferred($e, $l)) {
+		if ($deferred and ContainsDeferred($e, $l) and not $array_pointless) {
 			$self->pidl("for ($counter = 0; $counter < $length; $counter++) {");
 			$self->indent;
 			$self->ParseElementPushLevel($e, GetNextLevel($e, $l), $ndr, $var_name, $env, 0, 1);