3rdparties/software/cffi_0.21.0/examples/translator-test.lisp (3565 bytes)
1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*- 2 ;;; 3 ;;; translator-test.lisp --- Testing type translators. 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 (defpackage #:cffi-translator-test 29 (:use #:common-lisp #:cffi)) 30 31 (in-package #:cffi-translator-test) 32 33 ;;;# Verbose Pointer Translator 34 ;;; 35 ;;; This is a silly type translator that doesn't actually do any 36 ;;; translating, but it prints out a debug message when the pointer is 37 ;;; converted to/from its foreign representation. 38 39 (define-foreign-type verbose-pointer-type () 40 () 41 (:actual-type :pointer)) 42 43 (defmethod translate-to-foreign (value (type verbose-pointer-type)) 44 (format *debug-io* "~&;; to foreign: VERBOSE-POINTER: ~S~%" value) 45 value) 46 47 (defmethod translate-from-foreign (value (type verbose-pointer-type)) 48 (format *debug-io* "~&;; from foreign: VERBOSE-POINTER: ~S~%" value) 49 value) 50 51 ;;;# Verbose String Translator 52 ;;; 53 ;;; A VERBOSE-STRING extends VERBOSE-POINTER and converts Lisp strings 54 ;;; C strings. If things are working properly, both type translators 55 ;;; should be called when converting a Lisp string to/from a C string. 56 ;;; 57 ;;; The translators should be called most-specific-first when 58 ;;; translating to C, and most-specific-last when translating from C. 59 60 (define-foreign-type verbose-string-type (verbose-pointer-type) 61 () 62 (:simple-parser verbose-string)) 63 64 (defmethod translate-to-foreign ((s string) (type verbose-string-type)) 65 (let ((value (foreign-string-alloc s))) 66 (format *debug-io* "~&;; to foreign: VERBOSE-STRING: ~S -> ~S~%" s value) 67 (values (call-next-method value type) t))) 68 69 (defmethod translate-to-foreign (value (type verbose-string-type)) 70 (if (pointerp value) 71 (progn 72 (format *debug-io* "~&;; to foreign: VERBOSE-STRING: ~S -> ~:*~S~%" value) 73 (values (call-next-method) nil)) 74 (error "Cannot convert ~S to a foreign string: it is not a Lisp ~ 75 string or pointer." value))) 76 77 (defmethod translate-from-foreign (ptr (type verbose-string-type)) 78 (let ((value (foreign-string-to-lisp (call-next-method)))) 79 (format *debug-io* "~&;; from foreign: VERBOSE-STRING: ~S -> ~S~%" ptr value) 80 value)) 81 82 (defmethod free-translated-object (ptr (type verbose-string-type) free-p) 83 (when free-p 84 (format *debug-io* "~&;; freeing VERBOSE-STRING: ~S~%" ptr) 85 (foreign-string-free ptr))) 86 87 (defun test-verbose-string () 88 (foreign-funcall "getenv" verbose-string "SHELL" verbose-string))