0.8.21.21: fix & share EXTERN-ALIEN-NAME logic (fixes bug #373)
[sbcl.git] / 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              ((member :up) (write-string "../" s))))))
22       (etypecase name
23         (null)
24         (string (write-string name s)))
25       (etypecase type
26         (null)
27         (string (write-char #\. s) (write-string type s))))))
28
29 (define-designator filename c-string
30   (pathname 
31    (native-filename (translate-logical-pathname filename)))
32   (string filename))
33
34 (define-designator file-descriptor (integer 32)
35   (file-stream (sb-sys:fd-stream-fd file-descriptor))
36   (fixnum file-descriptor))
37
38 (define-designator sap-or-nil sb-sys:system-area-pointer
39   (null (sb-sys:int-sap 0))
40   (sb-sys:system-area-pointer sap-or-nil))
41
42 (define-designator alien-pointer-to-anything-or-nil (* t)
43   (null (sb-alien:sap-alien (sb-sys:int-sap 0) (* t)))
44   ((alien (* t)) alien-pointer-to-anything-or-nil))
45
46 (defun lisp-for-c-symbol (s)
47   (intern (substitute #\- #\_ (string-upcase s)) :sb-posix))
48
49 (defmacro define-call-internally (lisp-name c-name return-type error-predicate
50                                   &rest arguments)
51   (if (sb-sys:foreign-symbol-address-as-integer-or-nil c-name)
52       `(progn
53         (declaim (inline ,lisp-name))
54         (defun ,lisp-name ,(mapcar #'car arguments)
55           (let ((r (alien-funcall
56                     (extern-alien
57                      ,c-name
58                      (function ,return-type
59                                ,@(mapcar
60                                   (lambda (x)
61                                     (gethash (cadr x)
62                                              *designator-types*
63                                              (cadr x)))
64                                   arguments)))
65                     ,@(mapcar (lambda (x)
66                                 (if (nth-value 1
67                                                (gethash (cadr x)
68                                                         *designator-types*))
69                                     `(,(intern (symbol-name (cadr x))
70                                                :sb-posix)
71                                       ,(car x))
72                                     (car x)))
73                               arguments))))
74             (if (,error-predicate r) (syscall-error) r))))
75       `(sb-int:style-warn "Didn't find definition for ~S" ,c-name)))
76
77 (defmacro define-call (name return-type error-predicate &rest arguments)
78   (let ((lisp-name (lisp-for-c-symbol name)))
79     `(progn
80        (export ',lisp-name :sb-posix)
81        (define-call-internally ,lisp-name
82            ,name
83          ,return-type
84          ,error-predicate
85          ,@arguments))))
86
87 (defmacro define-entry-point (name arglist &body body)
88   (let ((lisp-name (lisp-for-c-symbol name)))
89     `(progn
90       (export ',lisp-name :sb-posix)
91       (declaim (inline ,lisp-name))
92       (defun ,lisp-name ,arglist
93         ,@body))))