* fix cleanroom TDataLink.CalcFirstRecord (passes tests now)cleanroom

git-svn-id: http://svn.freepascal.org/svn/fpc/branches/cleanroom@10565 3ad0048d-3df7-0310-abae-a5850022a9f2

1 files changed, 5 insertions, 3 deletions

diff --git a/packages/fcl-db/src/base/datasource.inc b/packages/fcl-db/src/base/datasource.inc
index ce3af0baf6..bccb1db5bd 100644
--- a/packages/fcl-db/src/base/datasource.inc
+++ b/packages/fcl-db/src/base/datasource.inc
@@ -58,10 +58,12 @@ end;
 
 
 Function TDataLink.CalcFirstRecord(Index : Integer) : Integer;
-var
-  n: Integer;
 begin
-  Result := DataSource.DataSet.FActiveRecord - (FFirstRecord + Index + FBufferCount - 1);
+  if DataSource.DataSet.FActiveRecord > FFirstRecord + Index + FBufferCount - 1 then
+    Result := DataSource.DataSet.FActiveRecord - (FFirstRecord + Index + FBufferCount - 1)
+  else if DataSource.DataSet.FActiveRecord < FFirstRecord + Index then
+    Result := DataSource.DataSet.FActiveRecord - (FFirstRecord + Index)
+  else Result := 0;
   
   Inc(FFirstRecord, Index + Result);
 end;