From: Eric Kohl <eric.kohl@t-online.de>
To: ReactOS Development List <ros-dev@reactos.org>
Date: Thu, 05 May 2011 22:41:24 +0200
Subject: Re: [ros-dev] [EVENTVWR/EVENTLOG] Fix a double off-by-one bug
Hi Love,

I just committed a fix for the calculation of the available number of event records. It addresses the issues you mentioned.

And this is how it works:
When a new log file is created, the first (or oldest) record gets the record number 1. With each new event record the record number is incremented by 1. To get the number of records in the log file we need to subtract the OldestRecordNumber from the CurrentRecordNumber. If the log file is empty the OldestRecordNumber will be 0. In this case we will return 0 for the number of event records.

Now we call clear a filled log file and fill it with new records. The oldest record will not be record number 1 but we can still return the true number of records in the log file.


Regards
Eric