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Fix a possible 'Division by zero'

Browse source 
In case a book entry has 'count' field set to 0
we crash. Spotted by Clang's static analyzer.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-05-26 23:14:37 +01:00
parent 3361ad4242
commit 61a054b170
1 changed files with 1 additions and 1 deletions
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2
src/book.cpp
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@ -420,7 +420,7 @@ Move Book::probe(const Position& pos, const string& fName, bool pickBest) {
// Choose book move according to its score. If a move has a very
// high score it has higher probability to be choosen than a move
// with lower score. Note that first entry is always chosen.
if ( (RKiss.rand<unsigned>() % sum < e.count)
if ( (sum && RKiss.rand<unsigned>() % sum < e.count)
|| (pickBest && e.count == best))
move = Move(e.move);
}