+;;; some explanation may be necessary. The namestring "[foo]"
+;;; denotes a wild pathname. When there's a file on the disk whose
+;;; Unix name is "[foo]", the appropriate CL namestring for it is
+;;; "\\[foo]". So, don't call NAMESTRING, instead call a function
+;;; that gets us the Unix name
+(defun native-filename (pathname)
+ (let ((directory (pathname-directory pathname))
+ (name (pathname-name pathname))
+ (type (pathname-type pathname)))
+ (with-output-to-string (s nil :element-type 'base-char)
+ (etypecase directory
+ (string (write-string directory s))
+ (list
+ (when (eq (car directory) :absolute)
+ (write-char #\/ s))
+ (dolist (piece (cdr directory))
+ (etypecase piece
+ (string (write-string piece s) (write-char #\/ s))
+ ((member :up) (write-string "../" s))))))
+ (etypecase name
+ (null)
+ (string (write-string name s)))
+ (etypecase type
+ (null)
+ (string (write-char #\. s) (write-string type s))))))
+
+(define-designator filename c-string
+ (pathname
+ (native-filename (translate-logical-pathname filename)))
+ (string filename))
+
+(define-designator file-descriptor (integer 32)
+ (file-stream (sb-sys:fd-stream-fd file-descriptor))
+ (fixnum file-descriptor))
+
+(define-designator sap-or-nil sb-sys:system-area-pointer
+ (null (sb-sys:int-sap 0))
+ (sb-sys:system-area-pointer sap-or-nil))
+
+(define-designator alien-pointer-to-anything-or-nil (* t)
+ (null (sb-alien:sap-alien (sb-sys:int-sap 0) (* t)))
+ ((alien (* t)) alien-pointer-to-anything-or-nil))
+