/*
 * Copyright (C) 2012 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id$
 */

#include "ipf.h"

int
ntomask(int family, int nbits, u_32_t *ap)
{
        u_32_t mask;

        if (nbits < 0)
                return (-1);

        switch (family)
        {
        case AF_INET :
                if (nbits > 32 || use_inet6 == 1)
                        return (-1);
                if (nbits == 0) {
                        mask = 0;
                } else {
                        mask = 0xffffffff;
                        mask <<= (32 - nbits);
                }
                *ap = htonl(mask);
                break;

        case 0 :
        case AF_INET6 :
                if ((nbits > 128) || (use_inet6 == -1))
                        return (-1);
                fill6bits(nbits, ap);
                break;

        default :
                return (-1);
        }
        return (0);
}