[ekohl] 51598: [EVENTLOG] Fix the calculation of the number of event records.

Author: ekohl
Date: Thu May  5 20:27:05 2011
New Revision: 51598

URL: http://svn.reactos.org/svn/reactos?rev=51598&view=rev
Log:
[EVENTLOG]
Fix the calculation of the number of event records.

Modified:
    trunk/reactos/base/services/eventlog/rpc.c

Modified: trunk/reactos/base/services/eventlog/rpc.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/base/services/eventlog/rpc…
==============================================================================
--- trunk/reactos/base/services/eventlog/rpc.c [iso-8859-1] (original)
+++ trunk/reactos/base/services/eventlog/rpc.c [iso-8859-1] Thu May  5 20:27:05 2011
@@ -199,7 +199,7 @@
     DWORD *NumberOfRecords)
 {
     PLOGHANDLE lpLogHandle;
-    DWORD dwRecords;
+    PLOGFILE lpLogFile;
 
     lpLogHandle = ElfGetLogHandleEntryByHandle(LogHandle);
     if (!lpLogHandle)
@@ -207,9 +207,13 @@
         return STATUS_INVALID_HANDLE;
     }
 
-    dwRecords = lpLogHandle->LogFile->Header.CurrentRecordNumber;
-
-    *NumberOfRecords = (dwRecords > 0) ? (dwRecords - 1) : 0;
+    lpLogFile = lpLogHandle->LogFile;
+
+    if (lpLogFile->Header.OldestRecordNumber == 0)
+        *NumberOfRecords = 0;
+    else
+        *NumberOfRecords = lpLogFile->Header.CurrentRecordNumber -
+                           lpLogFile->Header.OldestRecordNumber;
 
     return STATUS_SUCCESS;
 }