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	texamples.lisp (2705B)
	---
	1 ;;;; -- Mode: lisp; indent-tabs-mode: nil --
	2 ;;;
	3 ;;; examples.lisp --- Simple test examples of CFFI.
	4 ;;;
	5 ;;; Copyright (C) 2005-2006, James Bielman <[email protected]>
	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-examples
	29 (:use #:cl #:cffi)
	30 (:export
	31 #:run-examples
	32 #:sqrtf
	33 #:getenv))
	34
	35 (in-package #:cffi-examples)
	36
	37 ;; A simple libc function.
	38 (defcfun "sqrtf" :float
	39 (n :float))
	40
	41 ;; This definition uses the STRING type translator to automatically
	42 ;; convert Lisp strings to foreign strings and vice versa.
	43 (defcfun "getenv" :string
	44 (name :string))
	45
	46 ;; Calling a varargs function.
	47 (defun sprintf-test ()
	48 "Test calling a varargs function."
	49 (with-foreign-pointer-as-string ((buf buf-size) 255)
	50 (foreign-funcall
	51 "snprintf" :pointer buf :int buf-size
	52 :string "%d %f #x%x!" :int 666
	53 :double (coerce pi 'double-float)
	54 :unsigned-int #xcafebabe
	55 :void)))
	56
	57 ;; Defining an emerated type.
	58 (defcenum test-enum
	59 (:invalid 0)
	60 (:positive 1)
	61 (:negative -1))
	62
	63 ;; Use the absolute value function to test keyword/enum translation.
	64 (defcfun ("abs" c-abs) test-enum
	65 (n test-enum))
	66
	67 (defun cffi-version ()
	68 (asdf:component-version (asdf:find-system 'cffi)))
	69
	70 (defun run-examples ()
	71 (format t "~&;;; CFFI version ~A on ~A ~A:~%"
	72 (cffi-version) (lisp-implementation-type)
	73 (lisp-implementation-version))
	74 (format t "~&;; shell: ~A~%" (getenv "SHELL"))
	75 (format t "~&;; sprintf test: ~A~%" (sprintf-test))
	76 (format t "~&;; (c-abs :positive): ~A~%" (c-abs :positive))
	77 (format t "~&;; (c-abs :negative): ~A~%" (c-abs :negative))
	78 (force-output))