mdw@git.distorted.org.uk Git - clg/blob - glib/glib.lisp

   1 ;; Common Lisp bindings for GTK+ v1.2.x
   2 ;; Copyright (C) 1999-2005 Espen S. Johnsen <espen@users-sf-net>
   3 ;;
   4 ;; This library is free software; you can redistribute it and/or
   5 ;; modify it under the terms of the GNU Lesser General Public
   6 ;; License as published by the Free Software Foundation; either
   7 ;; version 2 of the License, or (at your option) any later version.
   8 ;;
   9 ;; This library is distributed in the hope that it will be useful,
  10 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 ;; Lesser General Public License for more details.
  13 ;;
  14 ;; You should have received a copy of the GNU Lesser General Public
  15 ;; License along with this library; if not, write to the Free Software
  16 ;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17
  18 ;; $Id: glib.lisp,v 1.29 2005-04-18 10:34:51 espen Exp $
  19
  20
  21 (in-package "GLIB")
  22
  23 (use-prefix "g")
  24
  25
  26 ;;;; Memory management
  27
  28 (defbinding (allocate-memory "g_malloc0") () pointer
  29   (size unsigned-long))
  30
  31 (defbinding (reallocate-memory "g_realloc") () pointer
  32   (address pointer)
  33   (size unsigned-long))
  34
  35 (defbinding (deallocate-memory "g_free") () nil
  36   (address pointer))
  37 ;; (defun deallocate-memory (address)
  38 ;;   (declare (ignore address)))
  39
  40 (defun copy-memory (from length &optional (to (allocate-memory length)))
  41   #+cmu(system-area-copy from 0 to 0 (* 8 length))
  42   #+sbcl(system-area-ub8-copy from 0 to 0 length)
  43   to)
  44
  45
  46 ;;;; User data mechanism
  47
  48 (internal *user-data* *user-data-count*)
  49
  50 (defvar *user-data* (make-hash-table))
  51 (defvar *user-data-count* 0)
  52
  53 (defun register-user-data (object &optional destroy-function)
  54   (check-type destroy-function (or null symbol function))
  55   (incf *user-data-count*)
  56   (setf
  57    (gethash *user-data-count* *user-data*)
  58    (cons object destroy-function))
  59   *user-data-count*)
  60
  61 (defun find-user-data (id)
  62   (check-type id fixnum)
  63   (multiple-value-bind (user-data p) (gethash id *user-data*)
  64     (values (car user-data) p)))
  65
  66 (defun user-data-exists-p (id)
  67   (nth-value 1 (find-user-data id)))
  68
  69 (defun update-user-data (id object)
  70   (check-type id fixnum)
  71   (multiple-value-bind (user-data exists-p) (gethash id *user-data*)
  72     (cond
  73      ((not exists-p) (error "User data id ~A does not exist" id))
  74      (t
  75       (when (cdr user-data)
  76         (funcall (cdr user-data) (car user-data)))
  77       (setf (car user-data) object)))))
  78
  79 (defun destroy-user-data (id)
  80   (check-type id fixnum)
  81   (let ((user-data (gethash id *user-data*)))
  82     (when (cdr user-data)
  83       (funcall (cdr user-data) (car user-data))))
  84   (remhash id *user-data*))
  85
  86
  87 ;;;; Quarks
  88
  89 (deftype quark () 'unsigned)
  90
  91 (defbinding %quark-from-string () quark
  92   (string string))
  93
  94 (defun quark-intern (object)
  95   (etypecase object
  96     (quark object)
  97     (string (%quark-from-string object))
  98     (symbol (%quark-from-string (format nil "clg-~A:~A"
  99                                  (package-name (symbol-package object))
 100                                  object)))))
 101
 102 (defbinding quark-to-string () (copy-of string)
 103   (quark quark))
 104
 105
 106 ;;;; Linked list (GList)
 107
 108 (deftype glist (type)
 109   `(or (null (cons ,type list))))
 110
 111 (defbinding (%glist-append "g_list_append") () pointer
 112   (glist pointer)
 113   (nil null))
 114
 115 (defun make-glist (type list)
 116   (loop
 117    with writer = (writer-function type)
 118    for element in list
 119    as glist = (%glist-append (or glist (make-pointer 0)))
 120    do (funcall writer element glist)
 121    finally (return glist)))
 122
 123 (defun glist-next (glist)
 124   (unless (null-pointer-p glist)
 125     (sap-ref-sap glist +size-of-pointer+)))
 126
 127 ;; Also used for gslists
 128 (defun map-glist (seqtype function glist element-type)
 129   (let ((reader (reader-function element-type)))
 130     (case seqtype
 131      ((nil)
 132       (loop
 133        as tmp = glist then (glist-next tmp)
 134        until (null-pointer-p tmp)
 135        do (funcall function (funcall reader tmp))))
 136      (list
 137       (loop
 138        as tmp = glist then (glist-next tmp)
 139        until (null-pointer-p tmp)
 140        collect (funcall function (funcall reader tmp))))
 141      (t
 142       (coerce
 143        (loop
 144         as tmp = glist then (glist-next tmp)
 145         until (null-pointer-p tmp)
 146         collect (funcall function (funcall reader tmp)))
 147        seqtype)))))
 148
 149 (defbinding (glist-free "g_list_free") () nil
 150   (glist pointer))
 151
 152 (defun destroy-glist (glist element-type)
 153   (loop
 154    with destroy = (destroy-function element-type)
 155    as tmp = glist then (glist-next tmp)
 156    until (null-pointer-p tmp)
 157    do (funcall destroy tmp 0))
 158   (glist-free glist))
 159
 160 (defmethod alien-type ((type (eql 'glist)) &rest args)
 161   (declare (ignore type args))
 162   (alien-type 'pointer))
 163
 164 (defmethod size-of ((type (eql 'glist)) &rest args)
 165   (declare (ignore type args))
 166   (size-of 'pointer))
 167
 168 (defmethod to-alien-form (list (type (eql 'glist)) &rest args)
 169   (declare (ignore type))
 170   (destructuring-bind (element-type) args
 171     `(make-glist ',element-type ,list)))
 172
 173 (defmethod to-alien-function ((type (eql 'glist)) &rest args)
 174   (declare (ignore type))
 175   (destructuring-bind (element-type) args
 176     #'(lambda (list)
 177         (make-glist element-type list))))
 178
 179 (defmethod from-alien-form (glist (type (eql 'glist)) &rest args)
 180   (declare (ignore type))
 181   (destructuring-bind (element-type) args
 182     `(let ((glist ,glist))
 183       (unwind-protect
 184            (map-glist 'list #'identity glist ',element-type)
 185         (destroy-glist glist ',element-type)))))
 186
 187 (defmethod from-alien-function ((type (eql 'glist)) &rest args)
 188   (declare (ignore type))
 189   (destructuring-bind (element-type) args
 190     #'(lambda (glist)
 191         (unwind-protect
 192              (map-glist 'list #'identity glist element-type)
 193           (destroy-glist glist element-type)))))
 194
 195 (defmethod copy-from-alien-form (glist (type (eql 'glist)) &rest args)
 196   (declare (ignore type))
 197   (destructuring-bind (element-type) args
 198     `(map-glist 'list #'identity ,glist ',element-type)))
 199
 200 (defmethod copy-from-alien-function ((type (eql 'glist)) &rest args)
 201   (declare (ignore type))
 202   (destructuring-bind (element-type) args
 203     #'(lambda (glist)
 204         (map-glist 'list #'identity glist element-type))))
 205
 206 (defmethod cleanup-form (glist (type (eql 'glist)) &rest args)
 207   (declare (ignore type))
 208   (destructuring-bind (element-type) args
 209     `(destroy-glist ,glist ',element-type)))
 210
 211 (defmethod cleanup-function ((type (eql 'glist)) &rest args)
 212   (declare (ignore type))
 213   (destructuring-bind (element-type) args
 214     #'(lambda (glist)
 215         (destroy-glist glist element-type))))
 216
 217 (defmethod writer-function ((type (eql 'glist)) &rest args)
 218   (declare (ignore type))
 219   (destructuring-bind (element-type) args
 220     #'(lambda (list location &optional (offset 0))
 221         (setf
 222          (sap-ref-sap location offset)
 223          (make-glist element-type list)))))
 224
 225 (defmethod reader-function ((type (eql 'glist)) &rest args)
 226   (declare (ignore type))
 227   (destructuring-bind (element-type) args
 228     #'(lambda (location &optional (offset 0))
 229         (unless (null-pointer-p (sap-ref-sap location offset))
 230           (map-glist 'list #'identity (sap-ref-sap location offset) element-type)))))
 231
 232 (defmethod destroy-function ((type (eql 'glist)) &rest args)
 233   (declare (ignore type))
 234   (destructuring-bind (element-type) args
 235     #'(lambda (location &optional (offset 0))
 236         (unless (null-pointer-p (sap-ref-sap location offset))
 237           (destroy-glist (sap-ref-sap location offset) element-type)
 238           (setf (sap-ref-sap location offset) (make-pointer 0))))))
 239
 240
 241
 242 ;;;; Single linked list (GSList)
 243
 244 (deftype gslist (type) `(or (null (cons ,type list))))
 245
 246 (defbinding (%gslist-prepend "g_slist_prepend") () pointer
 247   (gslist pointer)
 248   (nil null))
 249
 250 (defun make-gslist (type list)
 251   (loop
 252    with writer = (writer-function type)
 253    for element in (reverse list)
 254    as gslist = (%gslist-prepend (or gslist (make-pointer 0)))
 255    do (funcall writer element gslist)
 256    finally (return gslist)))
 257
 258 (defbinding (gslist-free "g_slist_free") () nil
 259   (gslist pointer))
 260
 261 (defun destroy-gslist (gslist element-type)
 262   (loop
 263    with destroy = (destroy-function element-type)
 264    as tmp = gslist then (glist-next tmp)
 265    until (null-pointer-p tmp)
 266    do (funcall destroy tmp 0))
 267   (gslist-free gslist))
 268
 269 (defmethod alien-type ((type (eql 'gslist)) &rest args)
 270   (declare (ignore type args))
 271   (alien-type 'pointer))
 272
 273 (defmethod size-of ((type (eql 'gslist)) &rest args)
 274   (declare (ignore type args))
 275   (size-of 'pointer))
 276
 277 (defmethod to-alien-form (list (type (eql 'gslist)) &rest args)
 278   (declare (ignore type))
 279   (destructuring-bind (element-type) args
 280     `(make-sglist ',element-type ,list)))
 281
 282 (defmethod to-alien-function ((type (eql 'gslist)) &rest args)
 283   (declare (ignore type))
 284   (destructuring-bind (element-type) args
 285     #'(lambda (list)
 286         (make-gslist element-type list))))
 287
 288 (defmethod from-alien-form (gslist (type (eql 'gslist)) &rest args)
 289   (declare (ignore type))
 290   (destructuring-bind (element-type) args
 291     `(let ((gslist ,gslist))
 292       (unwind-protect
 293            (map-glist 'list #'identity gslist ',element-type)
 294         (destroy-gslist gslist ',element-type)))))
 295
 296 (defmethod from-alien-function ((type (eql 'gslist)) &rest args)
 297   (declare (ignore type))
 298   (destructuring-bind (element-type) args
 299     #'(lambda (gslist)
 300         (unwind-protect
 301              (map-glist 'list #'identity gslist element-type)
 302           (destroy-gslist gslist element-type)))))
 303
 304 (defmethod copy-from-alien-form (gslist (type (eql 'gslist)) &rest args)
 305   (declare (ignore type))
 306   (destructuring-bind (element-type) args
 307     `(map-glist 'list #'identity ,gslist ',element-type)))
 308
 309 (defmethod copy-from-alien-function ((type (eql 'gslist)) &rest args)
 310   (declare (ignore type))
 311   (destructuring-bind (element-type) args
 312     #'(lambda (gslist)
 313         (map-glist 'list #'identity gslist element-type))))
 314
 315 (defmethod cleanup-form (gslist (type (eql 'gslist)) &rest args)
 316   (declare (ignore type))
 317   (destructuring-bind (element-type) args
 318     `(destroy-gslist ,gslist ',element-type)))
 319
 320 (defmethod cleanup-function ((type (eql 'gslist)) &rest args)
 321   (declare (ignore type))
 322   (destructuring-bind (element-type) args
 323     #'(lambda (gslist)
 324         (destroy-gslist gslist element-type))))
 325
 326 (defmethod writer-function ((type (eql 'gslist)) &rest args)
 327   (declare (ignore type))
 328   (destructuring-bind (element-type) args
 329     #'(lambda (list location &optional (offset 0))
 330         (setf
 331          (sap-ref-sap location offset)
 332          (make-gslist element-type list)))))
 333
 334 (defmethod reader-function ((type (eql 'gslist)) &rest args)
 335   (declare (ignore type))
 336   (destructuring-bind (element-type) args
 337     #'(lambda (location &optional (offset 0))
 338         (unless (null-pointer-p (sap-ref-sap location offset))
 339           (map-glist 'list #'identity (sap-ref-sap location offset) element-type)))))
 340
 341 (defmethod destroy-function ((type (eql 'gslist)) &rest args)
 342   (declare (ignore type))
 343   (destructuring-bind (element-type) args
 344     #'(lambda (location &optional (offset 0))
 345         (unless (null-pointer-p (sap-ref-sap location offset))
 346           (destroy-gslist (sap-ref-sap location offset) element-type)
 347           (setf (sap-ref-sap location offset) (make-pointer 0))))))
 348
 349
 350 ;;; Vector
 351
 352 (defun make-c-vector (type length &optional content location)
 353   (let* ((size-of-type (size-of type))
 354          (location (or location (allocate-memory (* size-of-type length))))
 355          (writer (writer-function type)))
 356     (etypecase content
 357       (vector
 358        (loop
 359         for element across content
 360         for i from 0 below length
 361         as offset = 0 then (+ offset size-of-type)
 362         do (funcall writer element location offset)))
 363       (list
 364        (loop
 365         for element in content
 366         for i from 0 below length
 367         as offset = 0 then (+ offset size-of-type)
 368         do (funcall writer element location offset))))
 369     location))
 370
 371
 372 (defun map-c-vector (seqtype function location element-type length)
 373   (let ((reader (reader-function element-type))
 374         (size-of-element (size-of element-type)))
 375     (case seqtype
 376      ((nil)
 377       (loop
 378        for i from 0 below length
 379        as offset = 0 then (+ offset size-of-element)
 380        do (funcall function (funcall reader location offset))))
 381      (list
 382       (loop
 383        for i from 0 below length
 384        as offset = 0 then (+ offset size-of-element)
 385        collect (funcall function (funcall reader location offset))))
 386      (t
 387       (loop
 388        with sequence = (make-sequence seqtype length)
 389        for i from 0 below length
 390        as offset = 0 then (+ offset size-of-element)
 391        do (setf
 392            (elt sequence i)
 393            (funcall function (funcall reader location offset)))
 394        finally (return sequence))))))
 395
 396
 397 (defun destroy-c-vector (location element-type length)
 398   (loop
 399    with destroy = (destroy-function element-type)
 400    with element-size = (size-of element-type)
 401    for i from 0 below length
 402    as offset = 0 then (+ offset element-size)
 403    do (funcall destroy location offset))
 404   (deallocate-memory location))
 405
 406
 407 (defmethod alien-type ((type (eql 'vector)) &rest args)
 408   (declare (ignore type args))
 409   (alien-type 'pointer))
 410
 411 (defmethod size-of ((type (eql 'vector)) &rest args)
 412   (declare (ignore type args))
 413   (size-of 'pointer))
 414
 415 (defmethod to-alien-form (vector (type (eql 'vector)) &rest args)
 416   (declare (ignore type))
 417   (destructuring-bind (element-type &optional (length '*)) args
 418     (if (eq length '*)
 419         `(let* ((vector ,vector)
 420                 (location (sap+
 421                            (allocate-memory (+ ,+size-of-int+
 422                                                (* ,(size-of element-type)
 423                                                   (length vector))))
 424                            ,+size-of-int+)))
 425           (make-c-vector ',element-type (length vector) vector location)
 426           (setf (sap-ref-32 location ,(- +size-of-int+)) (length vector))
 427           location)
 428       `(make-c-vector ',element-type ,length ,vector))))
 429
 430 (defmethod from-alien-form (c-vector (type (eql 'vector)) &rest args)
 431   (declare (ignore type))
 432   (destructuring-bind (element-type &optional (length '*)) args
 433     (if (eq length '*)
 434         (error "Can't use vector of variable size as return type")
 435       `(let ((c-vector ,c-vector))
 436         (prog1
 437             (map-c-vector 'vector #'identity c-vector ',element-type ,length)
 438           (destroy-c-vector c-vector ',element-type ,length))))))
 439
 440 (defmethod copy-from-alien-form (c-vector (type (eql 'vector)) &rest args)
 441   (declare (ignore type))
 442   (destructuring-bind (element-type &optional (length '*)) args
 443     (if (eq length '*)
 444         (error "Can't use vector of variable size as return type")
 445       `(map-c-vector 'vector #'identity ,c-vector ',element-type ',length))))
 446
 447 (defmethod copy-from-alien-function ((type (eql 'vector)) &rest args)
 448   (declare (ignore type))
 449   (destructuring-bind (element-type &optional (length '*)) args
 450     (if (eq length '*)
 451         (error "Can't use vector of variable size as return type")
 452       #'(lambda (c-vector)
 453           (map-c-vector 'vector #'identity c-vector element-type length)))))
 454
 455 (defmethod cleanup-form (location (type (eql 'vector)) &rest args)
 456   (declare (ignore type))
 457   (destructuring-bind (element-type &optional (length '*)) args
 458     `(let* ((location ,location)
 459             (length ,(if (eq length '*)
 460                          `(sap-ref-32 location ,(- +size-of-int+))
 461                          length)))
 462       (loop
 463        with destroy = (destroy-function ',element-type)
 464        for i from 0 below length
 465        as offset = 0 then (+ offset ,(size-of element-type))
 466        do (funcall destroy location offset))
 467       (deallocate-memory ,(if (eq length '*)
 468                               `(sap+ location  ,(- +size-of-int+))
 469                             'location)))))
 470
 471 (defmethod writer-function ((type (eql 'vector)) &rest args)
 472   (declare (ignore type))
 473   (destructuring-bind (element-type &optional (length '*)) args
 474     #'(lambda (vector location &optional (offset 0))
 475         (setf
 476          (sap-ref-sap location offset)
 477          (make-c-vector element-type length vector)))))
 478
 479 (defmethod reader-function ((type (eql 'vector)) &rest args)
 480   (declare (ignore type))
 481   (destructuring-bind (element-type &optional (length '*)) args
 482     (if (eq length '*)
 483         (error "Can't create reader function for vector of variable size")
 484       #'(lambda (location &optional (offset 0))
 485           (unless (null-pointer-p (sap-ref-sap location offset))
 486             (map-c-vector 'vector #'identity (sap-ref-sap location offset)
 487              element-type length))))))
 488
 489 (defmethod destroy-function ((type (eql 'vector)) &rest args)
 490   (declare (ignore type))
 491   (destructuring-bind (element-type &optional (length '*)) args
 492     (if (eq length '*)
 493         (error "Can't create destroy function for vector of variable size")
 494       #'(lambda (location &optional (offset 0))
 495           (unless (null-pointer-p (sap-ref-sap location offset))
 496             (destroy-c-vector
 497              (sap-ref-sap location offset) element-type length)
 498             (setf (sap-ref-sap location offset) (make-pointer 0)))))))
 499
 500
 501 ;;;; Null terminated vector
 502
 503 (defun make-0-vector (type content &optional location)
 504   (let* ((size-of-type (size-of type))
 505          (location (or
 506                     location
 507                     (allocate-memory (* size-of-type (1+ (length content))))))
 508          (writer (writer-function type)))
 509     (etypecase content
 510       (vector
 511        (loop
 512         for element across content
 513         as offset = 0 then (+ offset size-of-type)
 514         do (funcall writer element location offset)
 515         finally (setf (sap-ref-sap location offset) (make-pointer 0))))
 516       (list
 517        (loop
 518         for element in content
 519         as offset = 0 then (+ offset size-of-type)
 520         do (funcall writer element location offset)
 521         finally (setf (sap-ref-sap location (+ offset size-of-type)) (make-pointer 0)))))
 522     location))
 523
 524
 525 (defun map-0-vector (seqtype function location element-type)
 526   (let ((reader (reader-function element-type))
 527         (size-of-element (size-of element-type)))
 528     (case seqtype
 529      ((nil)
 530       (loop
 531        as offset = 0 then (+ offset size-of-element)
 532        until (null-pointer-p (sap-ref-sap location offset))
 533        do (funcall function (funcall reader location offset))))
 534      (list
 535       (loop
 536        as offset = 0 then (+ offset size-of-element)
 537        until (null-pointer-p (sap-ref-sap location offset))
 538        collect (funcall function (funcall reader location offset))))
 539      (t
 540       (coerce
 541        (loop
 542         as offset = 0 then (+ offset size-of-element)
 543         until (null-pointer-p (sap-ref-sap location offset))
 544         collect (funcall function (funcall reader location offset)))
 545        seqtype)))))
 546
 547
 548 (defun destroy-0-vector (location element-type)
 549   (loop
 550    with destroy = (destroy-function element-type)
 551    with element-size = (size-of element-type)
 552    as offset = 0 then (+ offset element-size)
 553    until (null-pointer-p (sap-ref-sap location offset))
 554    do (funcall destroy location offset))
 555   (deallocate-memory location))
 556
 557 (deftype null-terminated-vector (element-type) `(vector ,element-type))
 558
 559 (defmethod alien-type ((type (eql 'null-terminated-vector)) &rest args)
 560   (declare (ignore type args))
 561   (alien-type 'pointer))
 562
 563 (defmethod size-of ((type (eql 'null-terminated-vector)) &rest args)
 564   (declare (ignore type args))
 565   (size-of 'pointer))
 566
 567 (defmethod to-alien-form (vector (type (eql 'null-terminated-vector)) &rest args)
 568   (declare (ignore type))
 569   (destructuring-bind (element-type) args
 570     `(make-0-vector ',element-type ,vector)))
 571
 572 (defmethod from-alien-form (c-vector (type (eql 'null-terminated-vector)) &rest args)
 573   (declare (ignore type))
 574   (destructuring-bind (element-type) args
 575     `(let ((c-vector ,c-vector))
 576        (prog1
 577            (map-0-vector 'vector #'identity c-vector ',element-type)
 578          (destroy-0-vector c-vector ',element-type)))))
 579
 580 (defmethod copy-from-alien-form (c-vector (type (eql 'null-terminated-vector)) &rest args)
 581   (declare (ignore type))
 582   (destructuring-bind (element-type) args
 583     `(map-0-vector 'vector #'identity ,c-vector ',element-type)))
 584
 585 (defmethod cleanup-form (location (type (eql 'null-terminated-vector)) &rest args)
 586   (declare (ignore type))
 587   (destructuring-bind (element-type) args
 588     `(destroy-0-vector ,location ',element-type)))
 589
 590 (defmethod writer-function ((type (eql 'null-terminated-vector)) &rest args)
 591   (declare (ignore type))
 592   (destructuring-bind (element-type) args
 593     (unless (eq (alien-type element-type) (alien-type 'pointer))
 594       (error "Elements in null-terminated vectors need to be of pointer types"))
 595     #'(lambda (vector location &optional (offset 0))
 596         (setf
 597          (sap-ref-sap location offset)
 598          (make-0-vector element-type vector)))))
 599
 600 (defmethod reader-function ((type (eql 'null-terminated-vector)) &rest args)
 601   (declare (ignore type))
 602   (destructuring-bind (element-type) args
 603     (unless (eq (alien-type element-type) (alien-type 'pointer))
 604       (error "Elements in null-terminated vectors need to be of pointer types"))
 605     #'(lambda (location &optional (offset 0))
 606         (unless (null-pointer-p (sap-ref-sap location offset))
 607           (map-0-vector 'vector #'identity (sap-ref-sap location offset)
 608            element-type)))))
 609
 610 (defmethod destroy-function ((type (eql 'null-terminated-vector)) &rest args)
 611   (declare (ignore type))
 612   (destructuring-bind (element-type) args
 613     (unless (eq (alien-type element-type) (alien-type 'pointer))
 614       (error "Elements in null-terminated vectors need to be of pointer types"))
 615     #'(lambda (location &optional (offset 0))
 616           (unless (null-pointer-p (sap-ref-sap location offset))
 617             (destroy-0-vector
 618              (sap-ref-sap location offset) element-type)
 619             (setf (sap-ref-sap location offset) (make-pointer 0))))))
 620
 621 (defmethod unbound-value ((type (eql 'null-terminated-vector)) &rest args)
 622   (declare (ignore type args))
 623   (values t nil))
 624
 625
 626 ;;; Counted vector
 627
 628 (defun make-counted-vector (type content)
 629   (let* ((size-of-type (size-of type))
 630          (length (length content))
 631          (location
 632           (allocate-memory (+ +size-of-int+ (* size-of-type length)))))
 633     (setf (sap-ref-32 location 0) length)
 634     (make-c-vector type length content (sap+ location +size-of-int+))))
 635
 636 (defun map-counted-vector (seqtype function location element-type)
 637   (let ((length (sap-ref-32 location 0)))
 638     (map-c-vector
 639      seqtype function (sap+ location +size-of-int+)
 640      element-type length)))
 641
 642 (defun destroy-counted-vector (location element-type)
 643   (loop
 644    with destroy = (destroy-function element-type)
 645    with element-size = (size-of element-type)
 646    for i from 0 below (sap-ref-32 location 0)
 647    as offset = +size-of-int+ then (+ offset element-size)
 648    do (funcall destroy location offset))
 649   (deallocate-memory location))
 650
 651
 652 (deftype counted-vector (element-type) `(vector ,element-type))
 653
 654 (defmethod alien-type ((type (eql 'counted-vector)) &rest args)
 655   (declare (ignore type args))
 656   (alien-type 'pointer))
 657
 658 (defmethod size-of ((type (eql 'counted-vector)) &rest args)
 659   (declare (ignore type args))
 660   (size-of 'pointer))
 661
 662 (defmethod to-alien-form (vector (type (eql 'counted-vector)) &rest args)
 663   (declare (ignore type))
 664   (destructuring-bind (element-type) args
 665     `(make-counted-vector ',element-type ,vector)))
 666
 667 (defmethod from-alien-form (c-vector (type (eql 'counted-vector)) &rest args)
 668   (declare (ignore type))
 669   (destructuring-bind (element-type) args
 670     `(let ((c-vector ,c-vector))
 671        (prog1
 672            (map-counted-vector 'vector #'identity c-vector ',element-type)
 673          (destroy-counted-vector c-vector ',element-type)))))
 674
 675 (defmethod copy-from-alien-form (c-vector (type (eql 'counted-vector)) &rest args)
 676   (declare (ignore type))
 677   (destructuring-bind (element-type) args
 678     `(map-counted-vector 'vector #'identity ,c-vector ',element-type)))
 679
 680 (defmethod copy-from-alien-function ((type (eql 'counted-vector)) &rest args)
 681   (declare (ignore type))
 682   (destructuring-bind (element-type) args
 683     #'(lambda (c-vector)
 684         (map-counted-vector 'vector #'identity c-vector element-type))))
 685
 686 (defmethod cleanup-form (location (type (eql 'counted-vector)) &rest args)
 687   (declare (ignore type))
 688   (destructuring-bind (element-type) args
 689     `(destroy-counted-vector ,location ',element-type)))
 690
 691 (defmethod writer-function ((type (eql 'counted-vector)) &rest args)
 692   (declare (ignore type))
 693   (destructuring-bind (element-type) args
 694     #'(lambda (vector location &optional (offset 0))
 695         (setf
 696          (sap-ref-sap location offset)
 697          (make-counted-vector element-type vector)))))
 698
 699 (defmethod reader-function ((type (eql 'counted-vector)) &rest args)
 700   (declare (ignore type))
 701   (destructuring-bind (element-type) args
 702     #'(lambda (location &optional (offset 0))
 703         (unless (null-pointer-p (sap-ref-sap location offset))
 704           (map-counted-vector 'vector #'identity
 705            (sap-ref-sap location offset) element-type)))))
 706
 707 (defmethod destroy-function ((type (eql 'counted-vector)) &rest args)
 708   (declare (ignore type))
 709   (destructuring-bind (element-type) args
 710     #'(lambda (location &optional (offset 0))
 711         (unless (null-pointer-p (sap-ref-sap location offset))
 712           (destroy-counted-vector
 713            (sap-ref-sap location offset) element-type)
 714           (setf (sap-ref-sap location offset) (make-pointer 0))))))