ShellPkg/Dp: Add null pointer check

[mirror_edk2.git] / ShellPkg / Library / UefiShellNetwork1CommandsLib / UefiShellNetwork1CommandsLib.c

/** @file\r
  Main file for NULL named library for network1 shell command functions.\r
\r
  Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved. <BR>\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
#include "UefiShellNetwork1CommandsLib.h"\r
\r
CONST CHAR16 gShellNetwork1FileName[] = L"ShellCommands";\r
EFI_HANDLE gShellNetwork1HiiHandle = NULL;\r
\r
/**\r
  return the file name of the help text file if not using HII.\r
\r
  @return The string pointer to the file name.\r
**/\r
CONST CHAR16*\r
EFIAPI\r
ShellCommandGetManFileNameNetwork1 (\r
  VOID\r
  )\r
{\r
  return (gShellNetwork1FileName);\r
}\r
\r
/**\r
  Constructor for the Shell Network1 Commands library.\r
\r
  Install the handlers for Network1 UEFI Shell 2.0 profile commands.\r
\r
  @param ImageHandle            The image handle of the process.\r
  @param SystemTable            The EFI System Table pointer.\r
\r
  @retval EFI_SUCCESS           The shell command handlers were installed sucessfully.\r
  @retval EFI_UNSUPPORTED       The shell level required was not found.\r
**/\r
EFI_STATUS\r
EFIAPI\r
ShellNetwork1CommandsLibConstructor (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  gShellNetwork1HiiHandle = NULL;\r
\r
  //\r
  // check our bit of the profiles mask\r
  //\r
  if ((PcdGet8(PcdShellProfileMask) & BIT3) == 0) {\r
    return (EFI_SUCCESS);\r
  }\r
\r
  gShellNetwork1HiiHandle = HiiAddPackages (&gShellNetwork1HiiGuid, gImageHandle, UefiShellNetwork1CommandsLibStrings, NULL);\r
  if (gShellNetwork1HiiHandle == NULL) {\r
    return (EFI_DEVICE_ERROR);\r
  }\r
  //\r
  // install our shell command handlers\r
  //\r
  ShellCommandRegisterCommandName(L"ping",    ShellCommandRunPing     , ShellCommandGetManFileNameNetwork1, 0, L"network1", TRUE , gShellNetwork1HiiHandle, STRING_TOKEN(STR_GET_HELP_PING));\r
  ShellCommandRegisterCommandName(L"ifconfig",ShellCommandRunIfconfig , ShellCommandGetManFileNameNetwork1, 0, L"network1", TRUE , gShellNetwork1HiiHandle, STRING_TOKEN(STR_GET_HELP_IFCONFIG));\r
\r
  return (EFI_SUCCESS);\r
}\r
\r
/**\r
  Destructor for the library.  free any resources.\r
\r
  @param ImageHandle            The image handle of the process.\r
  @param SystemTable            The EFI System Table pointer.\r
**/\r
EFI_STATUS\r
EFIAPI\r
ShellNetwork1CommandsLibDestructor (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  if (gShellNetwork1HiiHandle != NULL) {\r
    HiiRemovePackages(gShellNetwork1HiiHandle);\r
  }\r
  return (EFI_SUCCESS);\r
}\r