1 /* $NetBSD: efidev.c,v 1.2 2020/07/15 00:51:40 jmcneill Exp $ */
2 /* $OpenBSD: efiboot.c,v 1.28 2017/11/25 19:02:07 patrick Exp $ */
3
4 /*
5 * Copyright (c) 2015 YASUOKA Masahiko <yasuoka@yasuoka.net>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include "efiboot.h"
21
22 /*
23 * Determine the number of nodes up to, but not including, the first
24 * node of the specified type.
25 */
26 int
efi_device_path_depth(EFI_DEVICE_PATH * dp,int dptype)27 efi_device_path_depth(EFI_DEVICE_PATH *dp, int dptype)
28 {
29 int i;
30
31 for (i = 0; !IsDevicePathEnd(dp); dp = NextDevicePathNode(dp), i++) {
32 if (DevicePathType(dp) == dptype)
33 return (i);
34 }
35
36 return (-1);
37 }
38
39 int
efi_device_path_count(EFI_DEVICE_PATH * dp)40 efi_device_path_count(EFI_DEVICE_PATH *dp)
41 {
42 int count;
43
44 for (count = 0; ; dp = NextDevicePathNode(dp), count++) {
45 if (IsDevicePathEnd(dp))
46 break;
47 }
48
49 return (count);
50 }
51
52 int
efi_device_path_ncmp(EFI_DEVICE_PATH * dpa,EFI_DEVICE_PATH * dpb,int deptn)53 efi_device_path_ncmp(EFI_DEVICE_PATH *dpa, EFI_DEVICE_PATH *dpb, int deptn)
54 {
55 int i, cmp;
56
57 for (i = 0; i < deptn; i++) {
58 if (IsDevicePathEnd(dpa) || IsDevicePathEnd(dpb))
59 return ((IsDevicePathEnd(dpa) && IsDevicePathEnd(dpb))
60 ? 0 : (IsDevicePathEnd(dpa))? -1 : 1);
61 cmp = DevicePathNodeLength(dpa) - DevicePathNodeLength(dpb);
62 if (cmp)
63 return (cmp);
64 cmp = memcmp(dpa, dpb, DevicePathNodeLength(dpa));
65 if (cmp)
66 return (cmp);
67 dpa = NextDevicePathNode(dpa);
68 dpb = NextDevicePathNode(dpb);
69 }
70
71 return (0);
72 }
73