/*      $NetBSD: efidev.c,v 1.2 2020/07/15 00:51:40 jmcneill Exp $      */
/*      $OpenBSD: efiboot.c,v 1.28 2017/11/25 19:02:07 patrick Exp $    */

/*
* Copyright (c) 2015 YASUOKA Masahiko <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include "efiboot.h"

/*
* Determine the number of nodes up to, but not including, the first
* node of the specified type.
*/
int
efi_device_path_depth(EFI_DEVICE_PATH *dp, int dptype)
{
       int     i;

       for (i = 0; !IsDevicePathEnd(dp); dp = NextDevicePathNode(dp), i++) {
               if (DevicePathType(dp) == dptype)
                       return (i);
       }

       return (-1);
}

int
efi_device_path_count(EFI_DEVICE_PATH *dp)
{
       int     count;

       for (count = 0; ; dp = NextDevicePathNode(dp), count++) {
               if (IsDevicePathEnd(dp))
                       break;
       }

       return (count);
}

int
efi_device_path_ncmp(EFI_DEVICE_PATH *dpa, EFI_DEVICE_PATH *dpb, int deptn)
{
       int      i, cmp;

       for (i = 0; i < deptn; i++) {
               if (IsDevicePathEnd(dpa) || IsDevicePathEnd(dpb))
                       return ((IsDevicePathEnd(dpa) && IsDevicePathEnd(dpb))
                           ? 0 : (IsDevicePathEnd(dpa))? -1 : 1);
               cmp = DevicePathNodeLength(dpa) - DevicePathNodeLength(dpb);
               if (cmp)
                       return (cmp);
               cmp = memcmp(dpa, dpb, DevicePathNodeLength(dpa));
               if (cmp)
                       return (cmp);
               dpa = NextDevicePathNode(dpa);
               dpb = NextDevicePathNode(dpb);
       }

       return (0);
}