union.lisp - clic - Clic is an command line interactive client for gopher written in Common LISP
 (HTM) git clone git://bitreich.org/clic/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/clic/
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       ---
       union.lisp (1994B)
       ---
            1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
            2 ;;;
            3 ;;; union.lisp --- Tests on C unions.
            4 ;;;
            5 ;;; Copyright (C) 2005-2006, James Bielman  <jamesjb@jamesjb.com>
            6 ;;;
            7 ;;; Permission is hereby granted, free of charge, to any person
            8 ;;; obtaining a copy of this software and associated documentation
            9 ;;; files (the "Software"), to deal in the Software without
           10 ;;; restriction, including without limitation the rights to use, copy,
           11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
           12 ;;; of the Software, and to permit persons to whom the Software is
           13 ;;; furnished to do so, subject to the following conditions:
           14 ;;;
           15 ;;; The above copyright notice and this permission notice shall be
           16 ;;; included in all copies or substantial portions of the Software.
           17 ;;;
           18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
           19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
           20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
           21 ;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
           22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
           23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
           24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
           25 ;;; DEALINGS IN THE SOFTWARE.
           26 ;;;
           27 
           28 (in-package #:cffi-tests)
           29 
           30 (defcunion uint32-bytes
           31   (int-value :unsigned-int)
           32   (bytes :unsigned-char :count 4))
           33 
           34 (defctype uint32-bytes (:union uint32-bytes))
           35 
           36 (defun int-to-bytes (n)
           37   "Convert N to a list of bytes using a union."
           38   (with-foreign-object (obj 'uint32-bytes)
           39     (setf (foreign-slot-value obj 'uint32-bytes 'int-value) n)
           40     (loop for i from 0 below 4
           41           collect (mem-aref
           42                    (foreign-slot-value obj 'uint32-bytes 'bytes)
           43                    :unsigned-char i))))
           44 
           45 (deftest union.1
           46     (let ((bytes (int-to-bytes #x12345678)))
           47       (cond ((equal bytes '(#x12 #x34 #x56 #x78))
           48              t)
           49             ((equal bytes '(#x78 #x56 #x34 #x12))
           50              t)
           51             (t bytes)))
           52   t)