[cells-cvs] CVS cells-gtk/cffi/examples
ktilton
ktilton at common-lisp.net
Mon Jan 28 23:59:28 UTC 2008
Update of /project/cells/cvsroot/cells-gtk/cffi/examples
In directory clnet:/tmp/cvs-serv9292/cffi/examples
Added Files:
examples.lisp gethostname.lisp gettimeofday.lisp
run-examples.lisp translator-test.lisp
Log Message:
--- /project/cells/cvsroot/cells-gtk/cffi/examples/examples.lisp 2008/01/28 23:59:27 NONE
+++ /project/cells/cvsroot/cells-gtk/cffi/examples/examples.lisp 2008/01/28 23:59:27 1.1
;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; examples.lisp --- Simple test examples of CFFI.
;;;
;;; Copyright (C) 2005-2006, James Bielman <jamesjb at 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.
;;;
(defpackage #:cffi-examples
(:use #:cl #:cffi)
(:export
#:run-examples
#:sqrtf
#:getenv))
(in-package #:cffi-examples)
;; A simple libc function.
(defcfun "sqrtf" :float
(n :float))
;; This definition uses the STRING type translator to automatically
;; convert Lisp strings to foreign strings and vice versa.
(defcfun "getenv" :string
(name :string))
;; Calling a varargs function.
(defun sprintf-test ()
"Test calling a varargs function."
(with-foreign-pointer-as-string (buf 255 buf-size)
(foreign-funcall
"snprintf" :pointer buf :int buf-size
:string "%d %f #x%x!" :int 666
:double (coerce pi 'double-float)
:unsigned-int #xcafebabe
:void)))
;; Defining an emerated type.
(defcenum test-enum
(:invalid 0)
(:positive 1)
(:negative -1))
;; Use the absolute value function to test keyword/enum translation.
(defcfun ("abs" c-abs) test-enum
(n test-enum))
(defun cffi-version ()
(asdf:component-version (asdf:find-system 'cffi)))
(defun run-examples ()
(format t "~&;;; CFFI version ~A on ~A ~A:~%"
(cffi-version) (lisp-implementation-type)
(lisp-implementation-version))
(format t "~&;; shell: ~A~%" (getenv "SHELL"))
(format t "~&;; sprintf test: ~A~%" (sprintf-test))
(format t "~&;; (c-abs :positive): ~A~%" (c-abs :positive))
(format t "~&;; (c-abs :negative): ~A~%" (c-abs :negative))
(force-output))
--- /project/cells/cvsroot/cells-gtk/cffi/examples/gethostname.lisp 2008/01/28 23:59:27 NONE
+++ /project/cells/cvsroot/cells-gtk/cffi/examples/gethostname.lisp 2008/01/28 23:59:27 1.1
;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; gethostname.lisp --- A simple CFFI example.
;;;
;;; Copyright (C) 2005-2006, James Bielman <jamesjb at 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.
;;;
;;;# CFFI Example: gethostname binding
;;;
;;; This is a very simple CFFI example that illustrates calling a C
;;; function that fills in a user-supplied string buffer.
(defpackage #:cffi-example-gethostname
(:use #:common-lisp #:cffi)
(:export #:gethostname))
(in-package #:cffi-example-gethostname)
;;; Define the Lisp function %GETHOSTNAME to call the C 'gethostname'
;;; function, which will fill BUF with up to BUFSIZE characters of the
;;; system's hostname.
(defcfun ("gethostname" %gethostname) :int
(buf :pointer)
(bufsize :int))
;;; Define a Lispy interface to 'gethostname'. The utility macro
;;; WITH-FOREIGN-POINTER-AS-STRING is used to allocate a temporary
;;; buffer and return it as a Lisp string.
(defun gethostname ()
(with-foreign-pointer-as-string (buf 255 bufsize)
(%gethostname buf bufsize)))
--- /project/cells/cvsroot/cells-gtk/cffi/examples/gettimeofday.lisp 2008/01/28 23:59:27 NONE
+++ /project/cells/cvsroot/cells-gtk/cffi/examples/gettimeofday.lisp 2008/01/28 23:59:27 1.1
;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; gettimeofday.lisp --- Example CFFI binding to gettimeofday(2)
;;;
;;; Copyright (C) 2005-2006, James Bielman <jamesjb at 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.
;;;
;;;# CFFI Example: gettimeofday binding
;;;
;;; This example illustrates the use of foreign structures, typedefs,
;;; and using type translators to do checking of input and output
;;; arguments to a foreign function.
(defpackage #:cffi-example-gettimeofday
(:use #:common-lisp #:cffi #:cffi-utils)
(:export #:gettimeofday))
(in-package #:cffi-example-gettimeofday)
;;; Define the TIMEVAL structure used by 'gettimeofday'. This assumes
;;; that 'time_t' is a 'long' --- it would be nice if CFFI could
;;; provide a proper :TIME-T type to help make this portable.
(defcstruct timeval
(tv-sec :long)
(tv-usec :long))
;;; A NULL-POINTER is a foreign :POINTER that must always be NULL.
;;; Both a NULL pointer and NIL are legal values---any others will
;;; result in a runtime error.
(defctype null-pointer :pointer)
;;; This type translator is used to ensure that a NULL-POINTER has a
;;; null value. It also converts NIL to a null pointer.
(defmethod translate-to-foreign (value (name (eql 'null-pointer)))
(cond
((null value) (null-pointer))
((null-pointer-p value) value)
(t (error "~A is not a null pointer." value))))
;;; The SYSCALL-RESULT type is an integer type used for the return
;;; value of C functions that return -1 and set errno on errors.
;;; Someday when CFFI has a portable interface for dealing with
;;; 'errno', this error reporting can be more useful.
(defctype syscall-result :int)
;;; Type translator to check a SYSCALL-RESULT and signal a Lisp error
;;; if the value is negative.
(defmethod translate-from-foreign (value (name (eql 'syscall-result)))
(if (minusp value)
(error "System call failed with return value ~D." value)
value))
;;; Define the Lisp function %GETTIMEOFDAY to call the C function
;;; 'gettimeofday', passing a pointer to the TIMEVAL structure to fill
;;; in. The TZP parameter is deprecated and should be NULL --- we can
;;; enforce this by using our NULL-POINTER type defined above.
(defcfun ("gettimeofday" %gettimeofday) syscall-result
(tp :pointer)
(tzp null-pointer))
;;; Define a Lispy interface to 'gettimeofday' that returns the
;;; seconds and microseconds as multiple values.
(defun gettimeofday ()
(with-foreign-object (tv 'timeval)
(%gettimeofday tv nil)
(with-foreign-slots ((tv-sec tv-usec) tv timeval)
(values tv-sec tv-usec))))
--- /project/cells/cvsroot/cells-gtk/cffi/examples/run-examples.lisp 2008/01/28 23:59:27 NONE
+++ /project/cells/cvsroot/cells-gtk/cffi/examples/run-examples.lisp 2008/01/28 23:59:27 1.1
;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; run-examples.lisp --- Simple script to run the examples.
;;;
;;; Copyright (C) 2005-2006, James Bielman <jamesjb at 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.
;;;
(setf *load-verbose* nil *compile-verbose* nil)
#+(and (not asdf) (or sbcl openmcl))
(require "asdf")
#+clisp
(load "~/Downloads/asdf")
(asdf:operate 'asdf:load-op 'cffi-examples :verbose nil)
(cffi-examples:run-examples)
(force-output)
(quit)
--- /project/cells/cvsroot/cells-gtk/cffi/examples/translator-test.lisp 2008/01/28 23:59:27 NONE
+++ /project/cells/cvsroot/cells-gtk/cffi/examples/translator-test.lisp 2008/01/28 23:59:27 1.1
;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; translator-test.lisp --- Testing type translators.
;;;
;;; Copyright (C) 2005-2006, James Bielman <jamesjb at 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.
;;;
(defpackage #:cffi-translator-test
(:use #:common-lisp #:cffi #:cffi-utils))
(in-package #:cffi-translator-test)
;;;# Verbose Pointer Translator
;;;
;;; This is a silly type translator that doesn't actually do any
;;; translating, but it prints out a debug message when the pointer is
;;; converted to/from its foreign representation.
(defctype verbose-pointer :pointer)
(defmethod translate-to-foreign (value (name (eql 'verbose-pointer)))
(format *debug-io* "~&;; to foreign: VERBOSE-POINTER: ~S~%" value)
value)
(defmethod translate-from-foreign (value (name (eql 'verbose-pointer)))
(format *debug-io* "~&;; from foreign: VERBOSE-POINTER: ~S~%" value)
value)
;;;# Verbose String Translator
;;;
;;; A VERBOSE-STRING is a typedef for a VERBOSE-POINTER except the
;;; Lisp string is first converted to a C string. If things are
;;; working properly, both type translators should be called when
;;; converting a Lisp string to/from a C string.
;;;
;;; The translators should be called most-specific-first when
;;; translating to C, and most-specific-last when translating from C.
(defctype verbose-string verbose-pointer)
(defmethod translate-to-foreign ((s string) (name (eql 'verbose-string)))
(let ((value (foreign-string-alloc s)))
(format *debug-io* "~&;; to foreign: VERBOSE-STRING: ~S -> ~S~%" s value)
(values value t)))
(defmethod translate-to-foreign (value (name (eql 'verbose-string)))
(if (pointerp value)
(progn
(format *debug-io* "~&;; to foreign: VERBOSE-STRING: ~S -> ~:*~S~%" value)
(values value nil))
(error "Cannot convert ~S to a foreign string: it is not a Lisp ~
string or pointer." value)))
(defmethod translate-from-foreign (ptr (name (eql 'verbose-string)))
(let ((value (foreign-string-to-lisp ptr)))
(format *debug-io* "~&;; from foreign: VERBOSE-STRING: ~S -> ~S~%" ptr value)
value))
(defmethod free-translated-object (ptr (name (eql 'verbose-string)) free-p)
(when free-p
(foreign-string-free ptr)))
(defun test-verbose-string ()
(foreign-funcall "getenv" verbose-string "SHELL" verbose-string))
;;;# Testing Chained Parameters
(defctype inner-type :int)
(defctype middle-type inner-type)
(defctype outer-type middle-type)
(defmethod translate-to-foreign (value (name (eql 'inner-type)))
(values value 1))
(defmethod translate-to-foreign (value (name (eql 'middle-type)))
(values value 2))
(defmethod translate-to-foreign (value (name (eql 'outer-type)))
(values value 3))
(defmethod free-translated-object (value (name (eql 'inner-type)) param)
(format t "~&;; free inner-type ~A~%" param))
(defmethod free-translated-object (value (name (eql 'middle-type)) param)
(format t "~&;; free middle-type ~A~%" param))
(defmethod free-translated-object (value (name (eql 'outer-type)) param)
(format t "~&;; free outer-type ~A~%" param))
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