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sbcl/.quicklisp/dists/quicklisp/software/cffi_0.20.1/tests/union.lisp

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+;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
+;;;
+;;; union.lisp --- Tests on C unions.
+;;;
+;;; Copyright (C) 2005-2006, James Bielman  <jamesjb@jamesjb.com>
+;;;
+;;; Permission is hereby granted, free of charge, to any person
+;;; obtaining a copy of this software and associated documentation
+;;; files (the "Software"), to deal in the Software without
+;;; restriction, including without limitation the rights to use, copy,
+;;; modify, merge, publish, distribute, sublicense, and/or sell copies
+;;; of the Software, and to permit persons to whom the Software is
+;;; furnished to do so, subject to the following conditions:
+;;;
+;;; The above copyright notice and this permission notice shall be
+;;; included in all copies or substantial portions of the Software.
+;;;
+;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+;;; DEALINGS IN THE SOFTWARE.
+;;;
+
+(in-package #:cffi-tests)
+
+(defcunion uint32-bytes
+  (int-value :unsigned-int)
+  (bytes :unsigned-char :count 4))
+
+(defctype uint32-bytes (:union uint32-bytes))
+
+(defun int-to-bytes (n)
+  "Convert N to a list of bytes using a union."
+  (with-foreign-object (obj 'uint32-bytes)
+    (setf (foreign-slot-value obj 'uint32-bytes 'int-value) n)
+    (loop for i from 0 below 4
+          collect (mem-aref
+                   (foreign-slot-value obj 'uint32-bytes 'bytes)
+                   :unsigned-char i))))
+
+(deftest union.1
+    (let ((bytes (int-to-bytes #x12345678)))
+      (cond ((equal bytes '(#x12 #x34 #x56 #x78))
+             t)
+            ((equal bytes '(#x78 #x56 #x34 #x12))
+             t)
+            (t bytes)))
+  t)