1 ;;;; FIXME: This file and host-c-call.lisp are separate from the
2 ;;;; rest of the alien source code for historical reasons: CMU CL
3 ;;;; made a distinction between the stuff in the C-CALL package and
4 ;;;; stuff in the ALIEN package. There's no obvious boundary
5 ;;;; there, though, and SBCL doesn't try to make this distinction,
6 ;;;; so it might make sense to just merge these files in with the
7 ;;;; rest of the SB-ALIEN code.
9 ;;;; This software is part of the SBCL system. See the README file for
10 ;;;; more information.
12 ;;;; This software is derived from the CMU CL system, which was
13 ;;;; written at Carnegie Mellon University and released into the
14 ;;;; public domain. The software is in the public domain and is
15 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
16 ;;;; files for more information.
18 (in-package "SB!ALIEN")
22 (define-alien-type char (integer 8))
23 (define-alien-type short (integer 16))
24 (define-alien-type int (integer 32))
25 (define-alien-type long (integer #.sb!vm::n-machine-word-bits))
27 (define-alien-type unsigned-char (unsigned 8))
28 (define-alien-type unsigned-short (unsigned 16))
29 (define-alien-type unsigned-int (unsigned 32))
30 (define-alien-type unsigned-long (unsigned #.sb!vm::n-machine-word-bits))
32 (define-alien-type float single-float)
33 (define-alien-type double double-float)
35 (define-alien-type-translator void ()
36 (parse-alien-type '(values) (sb!kernel:make-null-lexenv)))
38 ;;; FIXME: %NATURALIZE-C-STRING (and the UTF8 siblings below) would
39 ;;; appear to be vulnerable to the lisp string moving from underneath
40 ;;; them if the world undergoes a GC, possibly triggered by another
42 (defun %naturalize-c-string (sap)
43 (declare (type system-area-pointer sap))
45 (declare (optimize (speed 3) (safety 0)))
46 (let ((length (loop for offset of-type fixnum upfrom 0
47 until (zerop (sap-ref-8 sap offset))
48 finally (return offset))))
49 (let ((result (make-string length :element-type 'base-char)))
50 (sb!kernel:copy-ub8-from-system-area sap 0 result 0 length)
53 (defun %naturalize-utf8-string (sap)
54 (declare (type system-area-pointer sap))
56 (declare (optimize (speed 3) (safety 0)))
57 (let ((byte-length (do* ((offset 0 (1+ offset))
58 (byte #1=(sap-ref-8 sap offset) #1#))
59 ((zerop byte) offset))))
60 (handler-bind ((sb!impl::octet-decoding-error #'sb!impl::use-unicode-replacement-char))
61 (sb!impl::utf8->string-sap-ref-8 sap 0 byte-length)))))
63 (defun %deport-utf8-string (string)
64 (declare (type simple-string string))
65 (sb!impl::string->utf8 string 0 (length string) 1))