From 32e0123e1bdf7910849e35ae7c2c82576caa2c88 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <c.oelckers@github.noreply.com>
Date: Sat, 12 Nov 2016 14:01:34 +0100
Subject: [PATCH] - fixed: FResourceLump::LumpNameSetup passed negative numbers
 to FString::Truncate for extension-less lump names.

---
 src/resourcefiles/resourcefile.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/resourcefiles/resourcefile.cpp b/src/resourcefiles/resourcefile.cpp
index 912998d9a..603606341 100644
--- a/src/resourcefiles/resourcefile.cpp
+++ b/src/resourcefiles/resourcefile.cpp
@@ -95,7 +95,8 @@ void FResourceLump::LumpNameSetup(FString iname)
 {
 	long slash = iname.LastIndexOf('/');
 	FString base = (slash >= 0) ? iname.Mid(slash + 1) : iname;
-	base.Truncate(base.LastIndexOf('.'));
+	auto dot = base.LastIndexOf('.');
+	if (dot >= 0) base.Truncate(dot);
 	uppercopy(Name, base);
 	Name[8] = 0;
 	FullName = iname;