;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; gethostname.lisp --- A simple CFFI example.
;;;
  Copyright ( C ) 2005 - 2006 ,     <  >
;;;
;;; 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  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 bufsize) 255)
    (%gethostname buf bufsize)))

 -*- Mode: lisp; indent-tabs-mode: nil -*-

 gethostname.lisp --- A simple CFFI example.


 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation
 restriction, including without limitation the rights to use, copy,
 modify, merge, publish, distribute, sublicense, and/or sell copies
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be

 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.
 Define the Lisp function %GETHOSTNAME to call the C 'gethostname'
 system's hostname.
 WITH-FOREIGN-POINTER-AS-STRING is used to allocate a temporary
 buffer and return it as a Lisp string.
  Copyright ( C ) 2005 - 2006 ,     <  >
  files ( the " Software " ) , to deal in the Software without
  of the Software , and to permit persons to whom the Software is
  included in all copies or substantial portions of the Software .
  THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND ,


(defpackage #:cffi-example-gethostname
  (:use #:common-lisp #:cffi)
  (:export #:gethostname))

(in-package #:cffi-example-gethostname)

  function , which will fill BUF with up to BUFSIZE characters of the
(defcfun ("gethostname" %gethostname) :int
  (buf :pointer)
  (bufsize :int))

  Define a  interface to ' gethostname ' .   The utility macro
(defun gethostname ()
  (with-foreign-pointer-as-string ((buf bufsize) 255)
    (%gethostname buf bufsize)))
