1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
3 ;;; union.lisp --- Tests on C unions.
5 ;;; Copyright (C) 2005-2006, James Bielman <jamesjb@jamesjb.com>
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:
15 ;;; The above copyright notice and this permission notice shall be
16 ;;; included in all copies or substantial portions of the Software.
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.
28 (in-package #:cffi-tests
)
30 (defcunion uint32-bytes
31 (int-value :unsigned-int
)
32 (bytes :unsigned-char
:count
4))
34 (defctype uint32-bytes
(:union uint32-bytes
))
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
42 (foreign-slot-value obj
'uint32-bytes
'bytes
)
46 (let ((bytes (int-to-bytes #x12345678
)))
47 (cond ((equal bytes
'(#x12
#x34
#x56
#x78
))
49 ((equal bytes
'(#x78
#x56
#x34
#x12
))