Fixes the Oracle invalid date bug when date is greater or equal to 2800

By converting the char into unsigned char to avoid the overflow when
getting the century from a char for years greater or equal to 2800.

Task-number: QTBUG-8210
Reviewed-by: Michael Goddard

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sql/drivers/oci/qsql_oci.cpp b/src/sql/drivers/oci/qsql_oci.cpp
index 2f0cfdce58..c56b9955b5 100644
--- a/src/sql/drivers/oci/qsql_oci.cpp
+++ b/src/sql/drivers/oci/qsql_oci.cpp
@@ -648,7 +648,7 @@ QByteArray qMakeOraDate(const QDateTime& dt)
 
 QDateTime qMakeDate(const char* oraDate)
 {
-    int century = oraDate[0];
+    int century = uchar(oraDate[0]);
     if(century >= 100){
         int year    = uchar(oraDate[1]);
         year = ((century-100)*100) + (year-100);