"get_netbios_name()" can never return a negative number as the name

type, so "netbios_add_name()" doesn't need to check for it doing so
(yes, the tvbuff stuff *does* catch "get_netbios_name()" running past
the end of the packet, and causes an exception to be thrown).  Get rid
of the check, and get rid of "netbios_add_name()"s return value.

In "dissect_nbipx_dg()", always call the SMB dissector if there's data
left in the packet, regardless of whether the "tree" argument is null or
not; subdissectors should always be called, so they can build any
internal state on the first pass through the capture, and so that they
can fill in the Protocol and Info columns.

svn path=/trunk/; revision=2899

1 files changed, 27 insertions, 31 deletions

diff --git a/packet-nbipx.c b/packet-nbipx.c
index a99d153231..462f129ebf 100644
--- a/packet-nbipx.c
+++ b/packet-nbipx.c
@@ -2,7 +2,7 @@
  * Routines for NetBIOS over IPX packet disassembly
  * Gilbert Ramirez <gram@xiexie.org>
  *
- * $Id: packet-nbipx.c,v 1.35 2001/01/10 10:36:02 guy Exp $
+ * $Id: packet-nbipx.c,v 1.36 2001/01/15 04:39:28 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -236,7 +236,7 @@ dissect_nbipx_ns(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 static void
 dissect_nbipx_dg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 {
-	proto_tree			*nbipx_tree;
+	proto_tree			*nbipx_tree = NULL;
 	proto_item			*ti;
 	int				offset = 0;
 	guint8				conn_control;
@@ -273,31 +273,31 @@ dissect_nbipx_dg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 		proto_tree_add_text(cc_tree, tvb, offset, 1, "%s",
 		      decode_boolean_bitfield(conn_control, 0x08, 8,
 			      "Resend", "No resend"));
-		offset += 1;
+	}
+	offset += 1;
 
-		packet_type = tvb_get_guint8(tvb, offset);
+	packet_type = tvb_get_guint8(tvb, offset);
+	if (tree) {
 		proto_tree_add_text(nbipx_tree, tvb, offset, 1,
 				"Packet Type: %s (%02X)",
 				val_to_str(packet_type, nbipx_data_stream_type_vals, "Unknown"),
 				packet_type);
-		offset += 1;
+	}
+	offset += 1;
 
-		if (!netbios_add_name("Receiver's Name", tvb, offset,
-		    nbipx_tree))
-			return;
-		offset += NETBIOS_NAME_LEN;
+	if (tree)
+		netbios_add_name("Receiver's Name", tvb, offset, nbipx_tree);
+	offset += NETBIOS_NAME_LEN;
 
-		if (!netbios_add_name("Sender's Name", tvb, offset,
-		    nbipx_tree))
-			return;
-		offset += NETBIOS_NAME_LEN;
+	if (tree)
+		netbios_add_name("Sender's Name", tvb, offset, nbipx_tree);
+	offset += NETBIOS_NAME_LEN;
 
-		if (tvb_offset_exists(tvb, offset)) {
-			next_tvb = tvb_new_subset(tvb, offset, -1, -1);
-			tvb_compat(next_tvb, &next_pd, &next_offset);
-			dissect_smb(next_pd, next_offset, pinfo->fd, tree,
-			    tvb_length(next_tvb));
-		}
+	if (tvb_offset_exists(tvb, offset)) {
+		next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+		tvb_compat(next_tvb, &next_pd, &next_offset);
+		dissect_smb(next_pd, next_offset, pinfo->fd, tree,
+		    tvb_length(next_tvb));
 	}
 }
 
@@ -416,12 +416,10 @@ dissect_nwlink_dg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 			    decode_boolean_bitfield(name_type_flag, 0x01, 8,
 			      "Name deregistered", "Name not deregistered"));
 
-			if (!netbios_add_name("Group name", tvb, offset+36,
-			    nbipx_tree))
-				return;
-			if (!netbios_add_name("Node name", tvb, offset+52,
-			    nbipx_tree))
-				return;
+			netbios_add_name("Group name", tvb, offset+36,
+			    nbipx_tree);
+			netbios_add_name("Node name", tvb, offset+52,
+			    nbipx_tree);
 			proto_tree_add_text(nbipx_tree, tvb, offset+33, 1,
 			    "Packet Type: %s (%02X)",
 			    val_to_str(packet_type, nwlink_data_stream_type_vals, "Unknown"),
@@ -436,12 +434,10 @@ dissect_nwlink_dg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 			proto_tree_add_text(nbipx_tree, tvb, offset+34, 2,
 			    "Message ID: 0x%04x",
 			    tvb_get_letohs(tvb, offset+34));
-			if (!netbios_add_name("Requested name", tvb, offset+36,
-			    nbipx_tree))
-				return;
-			if (!netbios_add_name("Source name", tvb, offset+52,
-			    nbipx_tree))
-				return;
+			netbios_add_name("Requested name", tvb, offset+36,
+			    nbipx_tree);
+			netbios_add_name("Source name", tvb, offset+52,
+			    nbipx_tree);
 		}
 	}