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  DailyRollingFileAppender::rollover(bool alreadyLocked)

The method did not determine that maxBackupIndex<=0

When setting maxBackupIndex to 0, the program always displays two files, "log.2009-11-07" and "log.2009-11-07.1". The correct one should only appear as "log.2009-11-07"

You can refer to the
RollingFileAppender:: roller (bool alreadyLocked)

//If maxBackups<=0, then there is no file renaming to be done
If (maxBackupIndex>0)
{...} Add a judgment