52 lines
2.1 KiB
Common Lisp
52 lines
2.1 KiB
Common Lisp
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;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
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;;;
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;;; gethostname.lisp --- A simple CFFI example.
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;;;
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;;; Copyright (C) 2005-2006, James Bielman <jamesjb@jamesjb.com>
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;;;
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;;; Permission is hereby granted, free of charge, to any person
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;;; obtaining a copy of this software and associated documentation
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;;; files (the "Software"), to deal in the Software without
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;;; restriction, including without limitation the rights to use, copy,
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;;; modify, merge, publish, distribute, sublicense, and/or sell copies
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;;; of the Software, and to permit persons to whom the Software is
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;;; furnished to do so, subject to the following conditions:
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;;;
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;;; The above copyright notice and this permission notice shall be
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;;; included in all copies or substantial portions of the Software.
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;;;
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;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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;;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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;;; DEALINGS IN THE SOFTWARE.
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;;;
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;;;# CFFI Example: gethostname binding
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;;;
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;;; This is a very simple CFFI example that illustrates calling a C
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;;; function that fills in a user-supplied string buffer.
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(defpackage #:cffi-example-gethostname
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(:use #:common-lisp #:cffi)
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(:export #:gethostname))
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(in-package #:cffi-example-gethostname)
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;;; Define the Lisp function %GETHOSTNAME to call the C 'gethostname'
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;;; function, which will fill BUF with up to BUFSIZE characters of the
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;;; system's hostname.
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(defcfun ("gethostname" %gethostname) :int
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(buf :pointer)
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(bufsize :int))
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;;; Define a Lispy interface to 'gethostname'. The utility macro
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;;; WITH-FOREIGN-POINTER-AS-STRING is used to allocate a temporary
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;;; buffer and return it as a Lisp string.
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(defun gethostname ()
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(with-foreign-pointer-as-string ((buf bufsize) 255)
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(%gethostname buf bufsize)))
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