# define IS_ABSOLUTE_PATH(P) (ISSLASH ((P)[0]) || HAS_DEVICE (P))
# define IS_PATH_WITH_DIR(P) \
(strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
-# define FILESYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
+# define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
#else
/* Unix */
# define ISSLASH(C) ((C) == '/')
# define IS_ABSOLUTE_PATH(P) ISSLASH ((P)[0])
# define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
-# define FILESYSTEM_PREFIX_LEN(P) 0
+# define FILE_SYSTEM_PREFIX_LEN(P) 0
#endif
/* Concatenate a directory pathname, a relative pathname and an optional