@echo off
REM PathAdd.bat - add a directory to the current path, if it's not already there

if "%1"=="" GOTO SHOW_HOW
if not "%2"=="" GOTO SHOW_HOW
cenvi %0.BAT %1
GOTO FINI

:SHOW_HOW
ECHO PathAdd.bat - Add a directory to the PATH if it's not already there
ECHO USAGE: PathBat DirSpec
GOTO FINI


GOTO CENVI_EXIT

main(argc,argv)
{
   NewDir = argv[1]
   if ( AlreadyInPath(NewDir) ) {
      printf("The Directory \"%s\" is already in PATH.\n",NewDir)
   } else {
      // File is not already in the path, and so append to the end of PATH.
      // If there isn't a semi-colon at the end of PATH already, then add one.
      if ( PATH[strlen(PATH)-1] != ';' )
         strcat(PATH,";")
      // Append this new directory to the end of the path statement
      strcat(PATH,NewDir)
   }
}

AlreadyInPath(Dir) // search through path for this Dir, return True if found, else False
{
   len = strlen(Dir)
   p = PATH
   do {
      if ( 0 == strnicmp(p,Dir,len)  && (p[len]==0 || p[len]==';') )
         return(True)
      p = strchr(p,';')
   } while( p++ != NULL )
   return(False)
}

:CENVI_EXIT
:FINI