audk/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BmLib.c

/** @file
Utility routines used by boot maintenance modules.

Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "BootMaintenanceManager.h"

/**
  Function deletes the variable specified by VarName and VarGuid.

  @param VarName           A Null-terminated Unicode string that is
                           the name of the vendor's variable.

  @param VarGuid           A unique identifier for the vendor.

  @retval  EFI_SUCCESS           The variable was found and removed
  @retval  EFI_UNSUPPORTED       The variable store was inaccessible
  @retval  EFI_NOT_FOUND         The variable was not found

**/
EFI_STATUS
EfiLibDeleteVariable (
  IN CHAR16   *VarName,
  IN EFI_GUID *VarGuid
  )
{
  return gRT->SetVariable (
                VarName,
                VarGuid,
                0,
                0,
                NULL
                );
}

/**
  Function is used to determine the number of device path instances
  that exist in a device path.


  @param DevicePath      A pointer to a device path data structure.

  @return This function counts and returns the number of device path instances
          in DevicePath.

**/
UINTN
EfiDevicePathInstanceCount (
  IN EFI_DEVICE_PATH_PROTOCOL      *DevicePath
  )
{
  UINTN Count;
  UINTN Size;

  Count = 0;
  while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {
    Count += 1;
  }

  return Count;
}

/**
  Get a string from the Data Hub record based on
  a device path.

  @param DevPath         The device Path.

  @return A string located from the Data Hub records based on
          the device path.
  @retval NULL  If failed to get the String from Data Hub.

**/
UINT16 *
EfiLibStrFromDatahub (
  IN EFI_DEVICE_PATH_PROTOCOL                 *DevPath
  )
{
  return NULL;
}