-# ifndef ISSLASH
-# define ISSLASH(C) ((C) == DIRECTORY_SEPARATOR)
-# endif
-
-# ifndef FILE_SYSTEM_PREFIX_LEN
-# if FILE_SYSTEM_ACCEPTS_DRIVE_LETTER_PREFIX
- /* This internal macro assumes ASCII, but all hosts that support drive
- letters use ASCII. */
-# define _IS_DRIVE_LETTER(c) (((unsigned int) (c) | ('a' - 'A')) - 'a' \
- <= 'z' - 'a')
-# define FILE_SYSTEM_PREFIX_LEN(Filename) \
- (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':' ? 2 : 0)
-# else
-# define FILE_SYSTEM_PREFIX_LEN(Filename) 0
-# endif
-# endif
-
-# ifndef FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE
-# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0
-# endif
-