From: Marco Costalba <mcostalba@gmail.com>
Date: Sun, 27 May 2012 13:13:14 +0000 (+0100)
Subject: Fix an issue when adding a book during the game
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=0412f4a1ee1b738441490dd6f3d324c21ee75987;ds=sidebyside

Fix an issue when adding a book during the game

Currently when we fail to open a book file, for instance
if it doesn't exsist, we leave Book::open() with ifstream
failbit set. If then the book file is added, we correctly
open it at next attempt, but failbit is still set so that
after opening we exit because ifstream::good() returns false.

The fix is to reset failbit upon exiting.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/book.cpp b/src/book.cpp
index cc433a90..40b647cf 100644
--- a/src/book.cpp
+++ b/src/book.cpp
@@ -378,7 +378,10 @@ bool Book::open(const char* fName) {
   ifstream::open(fName, ifstream::in | ifstream::binary | ios::ate);
 
   if (!is_open())
+  {
+      clear();
       return false; // Silently fail if the file is not found
+  }
 
   // Get the book size in number of entries, we are already at the end of file
   size = (size_t)tellg() / sizeof(BookEntry);