CMD: failure of %~d0 when CALL quotes the name of the batch file

Question

Why the following failure of %~d0 to return the batch file\'s drive letter S: when CALL quotes the name of the batch file?

S:\\!DJ DAP>type test.b         


        

Answer 1

Like dbenham: Fascinating!

I suppose it's a feature of cmd.exe.

Quotes aren't stripped from %0 in the main batch context.
But they are all stripped by a call to a subroutine. This can be realized when more than two quotes are used, only one quote from each side will be removed when the %0 is expanded.

ParamTest.bat

@echo off
cls
setlocal
d:
echo Main %%0: %~0, %~f0
echo Main %%1: %~1, %~f1
call :func %1
exit /b

:func
echo Func %%0: %~0, %~f0
echo Func %%1: %~1, %~f1
exit /b

Output for: """"PARAM"test.BAT" ""paramTEST.bAt""

Main %0: """PARAM"test.BAT, D:\"""PARAM"test.BAT
Main %1: "paramTEST.bAt", D:\"paramTEST.bAt"
Func %0: :func, C:\temp\ParamTest.bat
Func %1: "paramTEST.bAt", D:\"paramTEST.bAt"

And %0 seems to save the related directory, as you get different results for %~f0 and %~f1 even when the content seems to be equal.
But perhaps the path is just prefixed to %0.

Output for: PARAMtest.BAT paramTEST.bAt

Main %0: PARAMtest.BAT, C:\temp\ParamTest.bat
Main %1: paramTEST.bAt, D:\paramTEST.bAt
Func %0: :func, C:\temp\ParamTest.bat
Func %1: paramTEST.bAt, D:\paramTEST.bAt