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      1 /** @file
      2 Utility routines used by boot maintenance modules.
      3 
      4 Copyright (c) 2004 - 2015, Intel Corporation. All rights reserved.<BR>
      5 This program and the accompanying materials
      6 are licensed and made available under the terms and conditions of the BSD License
      7 which accompanies this distribution.  The full text of the license may be found at
      8 http://opensource.org/licenses/bsd-license.php
      9 
     10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
     11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     12 
     13 **/
     14 
     15 #include "BootMaintenanceManager.h"
     16 
     17 /**
     18   Function deletes the variable specified by VarName and VarGuid.
     19 
     20   @param VarName           A Null-terminated Unicode string that is
     21                            the name of the vendor's variable.
     22 
     23   @param VarGuid           A unique identifier for the vendor.
     24 
     25   @retval  EFI_SUCCESS           The variable was found and removed
     26   @retval  EFI_UNSUPPORTED       The variable store was inaccessible
     27   @retval  EFI_NOT_FOUND         The variable was not found
     28 
     29 **/
     30 EFI_STATUS
     31 EfiLibDeleteVariable (
     32   IN CHAR16   *VarName,
     33   IN EFI_GUID *VarGuid
     34   )
     35 {
     36   return gRT->SetVariable (
     37                 VarName,
     38                 VarGuid,
     39                 0,
     40                 0,
     41                 NULL
     42                 );
     43 }
     44 
     45 /**
     46   Function is used to determine the number of device path instances
     47   that exist in a device path.
     48 
     49 
     50   @param DevicePath      A pointer to a device path data structure.
     51 
     52   @return This function counts and returns the number of device path instances
     53           in DevicePath.
     54 
     55 **/
     56 UINTN
     57 EfiDevicePathInstanceCount (
     58   IN EFI_DEVICE_PATH_PROTOCOL      *DevicePath
     59   )
     60 {
     61   UINTN Count;
     62   UINTN Size;
     63 
     64   Count = 0;
     65   while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {
     66     Count += 1;
     67   }
     68 
     69   return Count;
     70 }
     71 
     72 /**
     73   Get a string from the Data Hub record based on
     74   a device path.
     75 
     76   @param DevPath         The device Path.
     77 
     78   @return A string located from the Data Hub records based on
     79           the device path.
     80   @retval NULL  If failed to get the String from Data Hub.
     81 
     82 **/
     83 UINT16 *
     84 EfiLibStrFromDatahub (
     85   IN EFI_DEVICE_PATH_PROTOCOL                 *DevPath
     86   )
     87 {
     88   return NULL;
     89 }
     90