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	tgethostname.lisp - clic - Clic is an command line interactive client for gophe…
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	tgethostname.lisp (2112B)
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	1 ;;;; -- Mode: lisp; indent-tabs-mode: nil --
	2 ;;;
	3 ;;; gethostname.lisp --- A simple CFFI example.
	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 ;;;# CFFI Example: gethostname binding
	29 ;;;
	30 ;;; This is a very simple CFFI example that illustrates calling a C
	31 ;;; function that fills in a user-supplied string buffer.
	32
	33 (defpackage #:cffi-example-gethostname
	34 (:use #:common-lisp #:cffi)
	35 (:export #:gethostname))
	36
	37 (in-package #:cffi-example-gethostname)
	38
	39 ;;; Define the Lisp function %GETHOSTNAME to call the C 'gethostname'
	40 ;;; function, which will fill BUF with up to BUFSIZE characters of the
	41 ;;; system's hostname.
	42 (defcfun ("gethostname" %gethostname) :int
	43 (buf :pointer)
	44 (bufsize :int))
	45
	46 ;;; Define a Lispy interface to 'gethostname'. The utility macro
	47 ;;; WITH-FOREIGN-POINTER-AS-STRING is used to allocate a temporary
	48 ;;; buffer and return it as a Lisp string.
	49 (defun gethostname ()
	50 (with-foreign-pointer-as-string ((buf bufsize) 255)
	51 (%gethostname buf bufsize)))