;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
-(in-package "SB!C-CALL")
+(in-package "SB!ALIEN")
(/show0 "host-c-call.lisp 12")
-(define-alien-type-class (c-string :include pointer :include-args (to)))
+(define-alien-type-class (c-string :include pointer :include-args (to))
+ (external-format :default :type keyword)
+ (element-type 'character :type (member character base-char)))
-(define-alien-type-translator c-string ()
- (make-alien-c-string-type :to
- (parse-alien-type 'char
- (sb!kernel::make-null-lexenv))))
+(define-alien-type-translator c-string
+ (&key (external-format :default)
+ (element-type 'character))
+ (make-alien-c-string-type
+ :to (parse-alien-type 'char (sb!kernel:make-null-lexenv))
+ :element-type element-type
+ :external-format external-format))
+
+(defun c-string-external-format (type)
+ (let ((external-format (alien-c-string-type-external-format type)))
+ (if (eq external-format :default)
+ (default-c-string-external-format)
+ external-format)))
(define-alien-type-method (c-string :unparse) (type)
- (declare (ignore type))
- 'c-string)
+ (list 'c-string
+ :external-format (alien-c-string-type-external-format type)
+ :element-type (alien-c-string-type-element-type type)))
(define-alien-type-method (c-string :lisp-rep) (type)
(declare (ignore type))
- '(or simple-base-string null (alien (* char))))
+ '(or simple-string null (alien (* char)) (simple-array (unsigned-byte 8))))
-(define-alien-type-method (c-string :naturalize-gen) (type alien)
+(define-alien-type-method (c-string :deport-pin-p) (type)
+ (declare (ignore type))
+ t)
+
+(defun c-string-needs-conversion-p (type)
+ #+sb-xc-host
(declare (ignore type))
+ #+sb-xc-host
+ t
+ #-sb-xc-host
+ (let ((external-format (sb!impl::get-external-format
+ ;; Can't use C-STRING-EXTERNAL-FORMAT here,
+ ;; since the meaning of :DEFAULT can change
+ ;; when *DEFAULT-C-STRING-EXTERNAL-FORMAT*
+ ;; changes.
+ (alien-c-string-type-external-format type))))
+ (not (and external-format
+ (or (eq (caar external-format) :ascii)
+ ;; On non-SB-UNICODE all latin-1 codepoints will fit
+ ;; into a base-char, on SB-UNICODE they won't.
+ #!-sb-unicode
+ (eq (caar external-format) :latin-1))))))
+
+(define-alien-type-method (c-string :naturalize-gen) (type alien)
`(if (zerop (sap-int ,alien))
nil
- (%naturalize-c-string ,alien)))
+ ;; Check whether we need to do a full external-format
+ ;; conversion, or whether we can just do a cheap byte-by-byte
+ ;; copy of the c-string data.
+ ;;
+ ;; On SB-UNICODE we can never do the cheap copy, even if the
+ ;; external format and element-type are suitable, since
+ ;; simple-base-strings may not contain ISO-8859-1 characters.
+ ;; If we need to check for non-ascii data in the input, we
+ ;; might as well go through the usual external-format machinery
+ ;; instead of rewriting another version of it.
+ ,(if #!+sb-unicode t
+ #!-sb-unicode (c-string-needs-conversion-p type)
+ `(sb!alien::c-string-to-string ,alien
+ (c-string-external-format ,type)
+ (alien-c-string-type-element-type
+ ,type))
+ `(%naturalize-c-string ,alien))))
(define-alien-type-method (c-string :deport-gen) (type value)
(declare (ignore type))
+ ;; This SAP taking is safe as DEPORT callers pin the VALUE when
+ ;; necessary.
`(etypecase ,value
(null (int-sap 0))
((alien (* char)) (alien-sap ,value))
- (simple-base-string (vector-sap ,value))))
+ (vector (vector-sap ,value))))
+
+(define-alien-type-method (c-string :deport-alloc-gen) (type value)
+ `(etypecase ,value
+ (null nil)
+ ((alien (* char)) ,value)
+ (simple-base-string
+ ,(if (c-string-needs-conversion-p type)
+ ;; If the alien type is not ascii-compatible (+SB-UNICODE)
+ ;; or latin-1-compatible (-SB-UNICODE), we need to do
+ ;; external format conversion.
+ `(string-to-c-string ,value
+ (c-string-external-format ,type))
+ ;; Otherwise we can just pass it uncopied.
+ value))
+ (simple-string
+ (string-to-c-string ,value
+ (c-string-external-format ,type)))))
(/show0 "host-c-call.lisp end of file")
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