contrib/sb-posix/macros.lisp

   1 (in-package :sb-posix-internal)
   2
   3 ;;; some explanation may be necessary.  The namestring "[foo]"
   4 ;;; denotes a wild pathname.  When there's a file on the disk whose
   5 ;;; Unix name is "[foo]", the appropriate CL namestring for it is
   6 ;;; "\\[foo]".  So, don't call NAMESTRING, instead call a function
   7 ;;; that gets us the Unix name
   8 (defun native-filename (pathname)
   9   (let ((directory (pathname-directory pathname))
  10         (name (pathname-name pathname))
  11         (type (pathname-type pathname)))
  12     (with-output-to-string (s nil :element-type 'base-char)
  13       (etypecase directory
  14         (string (write-string directory s))
  15         (list
  16          (when (eq (car directory) :absolute)
  17            (write-char #\/ s))
  18          (dolist (piece (cdr directory))
  19            (etypecase piece
  20              (string (write-string piece s) (write-char #\/ s))))))
  21       (etypecase name
  22         (null)
  23         (string (write-string name s)))
  24       (etypecase type
  25         (null)
  26         (string (write-char #\. s) (write-string type s))))))
  27
  28 (define-designator filename c-string
  29   (pathname
  30    (native-filename (translate-logical-pathname filename)))
  31   (string filename))
  32
  33 (define-designator file-descriptor (integer 32)
  34   (sb-impl::file-stream (sb-impl::fd-stream-fd file-descriptor))
  35   (fixnum file-descriptor))
  36
  37 (define-designator sap-or-nil sb-sys:system-area-pointer
  38   (null (sb-sys:int-sap 0))
  39   (sb-sys:system-area-pointer sap-or-nil))
  40
  41 (defun lisp-for-c-symbol (s)
  42   (intern (substitute #\- #\_ (string-upcase s)) :sb-posix))
  43
  44 (defmacro define-call (name return-type error-predicate &rest arguments)
  45   (let ((lisp-name (lisp-for-c-symbol name)))
  46     (if (sb-fasl::foreign-symbol-address-as-integer-or-nil name)
  47         `(progn
  48           (export ',lisp-name :sb-posix)
  49           (declaim (inline ,lisp-name))
  50           (defun ,lisp-name ,(mapcar #'car arguments)
  51             (let ((r (alien-funcall
  52                       (extern-alien
  53                        ,name
  54                        (function ,return-type
  55                                  ,@(mapcar
  56                                     (lambda (x)
  57                                       (gethash (cadr x) *designator-types* (cadr x)))
  58                                     arguments)))
  59                       ,@(mapcar (lambda (x)
  60                                   (if (nth-value 1 (gethash (cadr x) *designator-types*))
  61                                       `(,(intern (symbol-name (cadr x)) :sb-posix)
  62                                         ,(car x))
  63                                       (car x)))
  64                                 arguments))))
  65               (if (,error-predicate r) (syscall-error) r))))
  66         `(progn
  67           (export ',lisp-name :sb-posix)
  68           (sb-int:style-warn "Didn't find definition for ~S" ,name)))))