@ECHO OFF
IF "%1"=="" GOTO USAGE
IF NOT EXIST %1.WAD GOTO FILE_ERROR
IF NOT EXIST BLANK.WAD GOTO BLANK_ERROR
COPY /b /y %1.wad+blank.wad %1.wad
GOTO END
:BLANK_ERROR
ECHO.
ECHO.
ECHO ERROR: Cannot find file BLANK.WAD in current directory.
ECHO.
GOTO END
:FILE_ERROR
ECHO.
ECHO.
ECHO ERROR: Cannot find file %1.WAD.
ECHO.
GOTO END
:USAGE
ECHO.
ECHO.
ECHO USAGE: ADDBLANK Wadfilename[.WAD]
ECHO.
:END