-;;;; This file contains some extensions to the Alien facility to
-;;;; simplify importing C interfaces.
+;;;; FIXME: This file and host-c-call.lisp are separate from the
+;;;; rest of the alien source code for historical reasons: CMU CL
+;;;; made a distinction between the stuff in the C-CALL package and
+;;;; stuff in the ALIEN package. There's no obvious boundary
+;;;; there, though, and SBCL doesn't try to make this distinction,
+;;;; so it might make sense to just merge these files in with the
+;;;; rest of the SB-ALIEN code.
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
-(in-package "SB!C-CALL")
+(in-package "SB!ALIEN")
\f
;;;; extra types
(define-alien-type char (integer 8))
(define-alien-type short (integer 16))
(define-alien-type int (integer 32))
-(define-alien-type long (integer #!-alpha 32 #!+alpha 64))
+(define-alien-type long (integer #.sb!vm::n-machine-word-bits))
(define-alien-type unsigned-char (unsigned 8))
(define-alien-type unsigned-short (unsigned 16))
(define-alien-type unsigned-int (unsigned 32))
-(define-alien-type unsigned-long (unsigned #!-alpha 32 #!+alpha 64))
+(define-alien-type unsigned-long (unsigned #.sb!vm::n-machine-word-bits))
(define-alien-type float single-float)
(define-alien-type double double-float)
(define-alien-type-translator void ()
(parse-alien-type '(values) (sb!kernel:make-null-lexenv)))
\f
+;;; FIXME: %NATURALIZE-C-STRING (and the UTF8 siblings below) would
+;;; appear to be vulnerable to the lisp string moving from underneath
+;;; them if the world undergoes a GC, possibly triggered by another
+;;; thread. Ugh.
(defun %naturalize-c-string (sap)
(declare (type system-area-pointer sap))
- (with-alien ((ptr (* char) sap))
- (locally
- (declare (optimize (speed 3) (safety 0)))
- (let ((length (loop
- for offset of-type fixnum upfrom 0
- until (zerop (deref ptr offset))
- finally (return offset))))
- (let ((result (make-string length)))
- (sb!kernel:copy-from-system-area (alien-sap ptr) 0
- result (* sb!vm:vector-data-offset
- sb!vm:n-word-bits)
- (* length sb!vm:n-byte-bits))
- result)))))
+ (locally
+ (declare (optimize (speed 3) (safety 0)))
+ (let ((length (loop for offset of-type fixnum upfrom 0
+ until (zerop (sap-ref-8 sap offset))
+ finally (return offset))))
+ (let ((result (make-string length :element-type 'base-char)))
+ (sb!kernel:copy-from-system-area sap 0
+ result (* sb!vm:vector-data-offset
+ sb!vm:n-word-bits)
+ (* length sb!vm:n-byte-bits))
+ result))))
+
+(defun %naturalize-utf8-string (sap)
+ (declare (type system-area-pointer sap))
+ (locally
+ (declare (optimize (speed 3) (safety 0)))
+ (let ((length (do* ((offset 0)
+ (byte (sap-ref-8 sap offset) (sap-ref-8 sap offset))
+ (index 0 (1+ index)))
+ ((zerop byte) index)
+ (declare (type fixnum offset index))
+ (cond
+ ;; FIXME: Here, and below, we don't defend
+ ;; against malformed utf-8 with any degree of
+ ;; rigour.
+ ((< byte #x80) (incf offset))
+ ((< byte #xe0) (incf offset 2))
+ ((< byte #xf0) (incf offset 3))
+ (t (incf offset 4))))))
+ (let ((result (make-string length :element-type 'character)))
+ (do* ((offset 0)
+ (byte (sap-ref-8 sap offset) (sap-ref-8 sap offset))
+ (index 0 (1+ index)))
+ ((>= index length) result)
+ (declare (type fixnum offset index))
+ (setf (char result index)
+ (cond
+ ((< byte #x80)
+ (prog1 (code-char byte) (incf offset)))
+ ((< byte #xe0)
+ (prog1 (code-char (dpb byte (byte 5 6)
+ (sap-ref-8 sap (1+ offset))))
+ (incf offset 2)))
+ ((< byte #xf0)
+ (prog1 (code-char
+ (dpb byte (byte 4 12)
+ (dpb (sap-ref-8 sap (1+ offset)) (byte 6 6)
+ (sap-ref-8 sap (+ 2 offset)))))
+ (incf offset 3)))
+ (t
+ (prog1
+ (code-char
+ (dpb byte (byte 3 18)
+ (dpb (sap-ref-8 sap (1+ offset)) (byte 6 12)
+ (dpb (sap-ref-8 sap (+ 2 offset)) (byte 6 6)
+ (sap-ref-8 sap (+ 3 offset))))))
+ (incf offset 4))))))))))
+
+(defun %deport-utf8-string (string)
+ (declare (type simple-string string))
+ (locally
+ (declare (optimize (speed 3) (safety 0)))
+ (let ((length (1+ (do* ((offset 0)
+ (length (length string))
+ (index 0 (1+ index)))
+ ((= index length) offset)
+ (declare (type fixnum offset))
+ (let ((bits (char-code (char string index))))
+ (cond
+ ((< bits #x80) (incf offset 1))
+ ((< bits #x800) (incf offset 2))
+ ((< bits #x10000) (incf offset 3))
+ (t (incf offset 4))))))))
+ (let ((vector (make-array length :element-type '(unsigned-byte 8)
+ :initial-element 0)))
+ (do* ((offset 0)
+ (length (length string))
+ (index 0 (1+ index)))
+ ((= index length) vector)
+ (declare (type fixnum offset))
+ (let ((bits (char-code (char string index))))
+ (cond
+ ((< bits #x80)
+ (setf (aref vector offset) bits)
+ (incf offset))
+ ((< bits #x800)
+ (setf (aref vector offset) (logior #xc0 (ldb (byte 5 6) bits)))
+ (setf (aref vector (1+ offset))
+ (logior #x80 (ldb (byte 6 0) bits)))
+ (incf offset 2))
+ ((< bits #x10000)
+ (setf (aref vector offset) (logior #xe0 (ldb (byte 4 12) bits)))
+ (setf (aref vector (1+ offset))
+ (logior #x80 (ldb (byte 6 6) bits)))
+ (setf (aref vector (+ offset 2))
+ (logior #x80 (ldb (byte 6 0) bits)))
+ (incf offset 3))
+ (t
+ (setf (aref vector offset) (logior #xf0 (ldb (byte 3 18) bits)))
+ (setf (aref vector (1+ offset))
+ (logior #x80 (ldb (byte 6 12) bits)))
+ (setf (aref vector (+ offset 2))
+ (logior #x80 (ldb (byte 6 6) bits)))
+ (setf (aref vector (+ offset 3))
+ (logior #x80 (ldb (byte 6 0) bits)))
+ (incf offset 4)))))))))
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