;;;; Copyright (C) 2021 Julien Lepiller <julien@lepiller.eu>

;;;; 

;;;; This library is free software; you can redistribute it and/or

;;;; modify it under the terms of the GNU Lesser General Public

;;;; License as published by the Free Software Foundation; either

;;;; version 3 of the License, or (at your option) any later version.

;;;; 

;;;; This library 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

;;;; Lesser General Public License for more details.

;;;; 

;;;; You should have received a copy of the GNU Lesser General Public

;;;; License along with this library; if not, write to the Free Software

;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

;;;; 

(define-module (netlink route)

  #:export (align

            route-attr-list-size

            serialize-route-attr-list))

(define (align pos to)

  (+ pos -1 (- to (modulo (- pos 1) to))))

(define (route-attr-list-size attrs)

  (apply + (map (lambda (d) (align (data-size d) 4)) attrs)))

(define (serialize-route-attr-list attrs pos bv)

  (let loop ((attrs attrs) (pos pos))

    (match attrs

      ((attr attrs ...)

       (serialize attr pos bv)

       (loop attrs (+ pos (align (data-size attr) 4))))

      (() #t))))