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[gnugo-devel] Bug in 3.7.2 --score estimate

From: Eric Backus
Subject: [gnugo-devel] Bug in 3.7.2 --score estimate
Date: Sun, 13 Mar 2005 14:18:36 -0800
User-agent: KMail/1.6.2

I've been using gnugo to help improve my go skills, and I find it very 
helpful.  Thank you for making this available.  I decided to try development 
version 3.7.2, and found a problem with:

        gnugo --score estimate -l anygame.sgf

This gives me a segmentation fault.  I tried the latest CVS version and got 
the same thing.  Not that it matters, but this is on a relatively unmodified 
SuSE 9.1 Linux system, with gnugo compiled with gcc 3.3.3.

So I tracked the problem down, and found that sometimes gnugo_estimate_score 
is called with NULL arguments, but the function doesn't test for that.  
Here's a trivial patch which fixes the problem:

--- engine/interface.c.orig     2005-01-06 11:50:27.000000000 -0800
+++ engine/interface.c  2005-03-12 23:45:10.000000000 -0800
@@ -353,8 +353,10 @@
 gnugo_estimate_score(float *upper, float *lower)
-  *upper = white_score;
-  *lower = black_score;
+  if (upper != NULL)
+    *upper = white_score;
+  if (lower != NULL)
+    *lower = black_score;
   return ((white_score + black_score)/2.0);

                Eric Backus <address@hidden>

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