@echo off
@setlocal
set BATNAME=pathtest_is_this_file_on_the_path.bat
set THISDIR=%~dp0
set TESTDIR=%THISDIR%foo;bar\
set TESTBAT=%TESTDIR%%BATNAME%
if not exist "%TESTDIR%" mkdir "%TESTDIR%"
echo @exit /b 0 >"%TESTBAT%"

set PATH=
call :dotest

set PATH=%THISDIR%foo;bar
call :dotest

set PATH=%THISDIR%"foo;bar"
call :dotest

set PATH="%THISDIR%foo;bar"
call :dotest

set PATH=%THISDIR%"foo;"bar
call :dotest

set PATH=%THISDIR%foo";"bar
call :dotest

set PATH=%THISDIR%""foo";"bar""
call :dotest

set PATH=
call :dotest

set PATH=%THISDIR%foo";bar
call :dotest

del "%TESTBAT%"
rmdir "%TESTDIR%"

goto :eof

:dotest
echo PATH=%PATH%
call %BATNAME% 2> NUL && echo SUCCESS || echo FAIL
echo.
exit /b 0