From 2440ab75b9cf52e17ae92a50ba951d8f08af9e53 Mon Sep 17 00:00:00 2001
From: Plagman <Plagman@1a8010ca-5511-0410-912e-c29ae57300e0>
Date: Mon, 16 Apr 2007 02:15:43 +0000
Subject: [PATCH] The Abyss crash fix.

git-svn-id: https://svn.eduke32.com/eduke32@533 1a8010ca-5511-0410-912e-c29ae57300e0
---
 polymer/build/src/engine.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/polymer/build/src/engine.c b/polymer/build/src/engine.c
index a21cb88f8..ea0a79c5f 100644
--- a/polymer/build/src/engine.c
+++ b/polymer/build/src/engine.c
@@ -8316,8 +8316,15 @@ long hitscan(long xs, long ys, long zs, short sectnum, long vx, long vy, long vz
                 if ((cstat&64) != 0)
                     if ((zs > intz) == ((cstat&8)==0)) continue;
 
+#if 1           // Abyss crash prevention code ((intz-zs)*zx overflowing a 8-bit word)
+                zz=(long)((intz-zs)*vx);
+                intx = xs+scale(zz,1,vz);
+                zz=(long)((intz-zs)*vy);
+                inty = ys+scale(zz,1,vz);
+#else
                 intx = xs+scale(intz-zs,vx,vz);
                 inty = ys+scale(intz-zs,vy,vz);
+#endif
 
                 if (klabs(intx-xs)+klabs(inty-ys) > klabs((*hitx)-xs)+klabs((*hity)-ys)) continue;