meta.lisp

   1 ;; Copyright (c) 2009 Vitaly Mayatskikh <v.mayatskih@gmail.com>
   2 ;;
   3 ;; This file is part of 0MQ.
   4 ;;
   5 ;; 0MQ is free software; you can redistribute it and/or modify it under
   6 ;; the terms of the Lesser GNU General Public License as published by
   7 ;; the Free Software Foundation; either version 3 of the License, or
   8 ;; (at your option) any later version.
   9 ;;
  10 ;; 0MQ is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ;; Lesser GNU General Public License for more details.
  14 ;;
  15 ;; You should have received a copy of the Lesser GNU General Public License
  16 ;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 (in-package :zeromq)
  19
  20 (define-condition error-again (error)
  21   ((argument :reader error-again :initarg :argument))
  22   (:report (lambda (condition stream)
  23              (write-string (convert-from-foreign
  24                             (%strerror (error-again condition))
  25                             :string)
  26                            stream))))
  27
  28 (defmacro defcfun* (name-and-options return-type &body args)
  29   (let* ((c-name (car name-and-options))
  30          (l-name (cadr name-and-options))
  31          (n-name (cffi::format-symbol t "%~A" l-name))
  32          (name (list c-name n-name))
  33
  34          (docstring (when (stringp (car args)) (pop args)))
  35          (ret (gensym)))
  36     (loop with opt
  37        for i in args
  38        unless (consp i) do (setq opt t)
  39        else
  40        collect i into args*
  41        and if (not opt) collect (car i) into names
  42        else collect (car i) into opts
  43        and collect (list (car i) 0) into opts-init
  44        end
  45        finally (return
  46          `(progn
  47             (defcfun ,name ,return-type
  48               ,@args*)
  49
  50             (defun ,l-name (,@names &optional ,@opts-init)
  51               ,docstring
  52               (let ((,ret (,n-name ,@names ,@opts)))
  53                 (if ,(if (eq return-type :pointer)
  54                            `(zerop (pointer-address ,ret))
  55                            `(not (zerop ,ret)))
  56                     (cond
  57                       ((eq *errno* isys:eagain) (error 'error-again :argument *errno*))
  58                       (t (error (convert-from-foreign (%strerror *errno*) :string))))
  59                 ,ret))))))))