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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix gcrypt)
#:use-module (guix config)
#:use-module (system foreign)
#:export (gcrypt-version
libgcrypt-func))
;;; Commentary:
;;;
;;; Common code for the GNU Libgcrypt bindings. Loading this module
;;; initializes Libgcrypt as a side effect.
;;;
;;; Code:
(define libgcrypt-func
(let ((lib (dynamic-link %libgcrypt)))
(lambda (func)
"Return a pointer to symbol FUNC in libgcrypt."
(dynamic-func func lib))))
(define gcrypt-version
;; According to the manual, this function must be called before any other,
;; and it's not clear whether it can be called more than once. So call it
;; right here from the top level.
(let* ((ptr (libgcrypt-func "gcry_check_version"))
(proc (pointer->procedure '* ptr '(*)))
(version (pointer->string (proc %null-pointer))))
(lambda ()
"Return the version number of libgcrypt as a string."
version)))
;;; gcrypt.scm ends here
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