;;;; This file is part of Guile Netlink

;;;;

;;;; 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 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 General Public License for more details.

;;;;

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

;;;; along with this library.  If not, see <https://www.gnu.org/licenses/>.

(define-module (netlink route)

  #:use-module (ice-9 match)

  #:use-module (netlink data)

  #: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))))