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 */ 26int 27efi_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 39int 40efi_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 52int 53efi_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