gethostname.lisp - clic - Clic is an command line interactive client for gopher written in Common LISP
 (HTM) git clone git://bitreich.org/clic/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/clic/
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       gethostname.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  <jamesjb@jamesjb.com>
            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)))