ShellPkg/Dp: Add null pointer check

[mirror_edk2.git] / ShellPkg / Library / UefiShellDriver1CommandsLib / DevTree.c

/** @file\r
  Main file for DevTree shell Driver1 function.\r
\r
  (C) Copyright 2014-2015 Hewlett-Packard Development Company, L.P.<BR>\r
  Copyright (c) 2010 - 2016, 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
\r
#include "UefiShellDriver1CommandsLib.h"\r
\r
STATIC CONST SHELL_PARAM_ITEM ParamList[] = {\r
  {L"-d", TypeFlag},\r
  {L"-l", TypeValue},\r
  {NULL, TypeMax}\r
  };\r
\r
/**\r
  Display a tree starting from this handle.\r
\r
  @param[in] TheHandle      The handle to start with.\r
  @param[in] Lang           Optionally, a UEFI defined language code.\r
  @param[in] UseDevPaths    TRUE to display info from DevPath as identifiers.\r
                            FALSE will use component name protocol instead.\r
  @param[in] IndentCharCount   How many characters to indent (allows for recursion).\r
  @param[in] HiiString      The string from HII to use for output.\r
\r
  @retval SHELL_SUCCESS     The operation was successful.\r
**/\r
SHELL_STATUS\r
DoDevTreeForHandle(\r
  IN CONST EFI_HANDLE TheHandle,\r
  IN CONST CHAR8      *Lang OPTIONAL,\r
  IN CONST BOOLEAN    UseDevPaths,\r
  IN CONST UINTN      IndentCharCount,\r
  IN CONST CHAR16     *HiiString\r
  )\r
{\r
  SHELL_STATUS        ShellStatus;\r
  EFI_STATUS          Status;\r
  CHAR16              *FormatString;\r
  CHAR16              *Name;\r
  EFI_HANDLE          *ChildHandleBuffer;\r
  UINTN               ChildCount;\r
  UINTN               LoopVar;\r
\r
  Status              = EFI_SUCCESS;\r
  ShellStatus         = SHELL_SUCCESS;\r
  Name                = NULL;\r
  ChildHandleBuffer   = NULL;\r
  ChildCount          = 0;\r
\r
  ASSERT (TheHandle != NULL);\r
  ASSERT (HiiString != NULL);\r
  \r
  if (ShellGetExecutionBreakFlag()) {\r
    ShellStatus = SHELL_ABORTED;\r
    return ShellStatus;\r
  }\r
  \r
  //\r
  // We want controller handles.  they will not have LoadedImage or DriverBinding (or others...)\r
  //\r
  Status = gBS->OpenProtocol (\r
                TheHandle,\r
                &gEfiDriverBindingProtocolGuid,\r
                NULL,\r
                NULL,\r
                NULL,\r
                EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
               );\r
  if (!EFI_ERROR (Status)) {\r
    return SHELL_SUCCESS;\r
  }\r
\r
  Status = gBS->OpenProtocol (\r
                TheHandle,\r
                &gEfiLoadedImageProtocolGuid,\r
                NULL,\r
                NULL,\r
                NULL,\r
                EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
               );\r
  if (!EFI_ERROR (Status)) {\r
    return SHELL_SUCCESS;\r
  }\r
\r
  FormatString = AllocateZeroPool(StrSize(HiiString) + (10)*sizeof(FormatString[0]));\r
  if (FormatString == NULL) {\r
    return SHELL_OUT_OF_RESOURCES;\r
  }\r
\r
  //\r
  // we generate the format string on the fly so that we can control the\r
  // number of space characters that the first (empty) string has.  this\r
  // handles the indenting.\r
  //\r
\r
  UnicodeSPrint(FormatString, StrSize(HiiString) + (10)*sizeof(FormatString[0]), L"%%%ds %s", IndentCharCount, HiiString);\r
  gEfiShellProtocol->GetDeviceName((EFI_HANDLE)TheHandle, !UseDevPaths?EFI_DEVICE_NAME_USE_COMPONENT_NAME|EFI_DEVICE_NAME_USE_DEVICE_PATH:EFI_DEVICE_NAME_USE_DEVICE_PATH, (CHAR8*)Lang, &Name);\r
  //\r
  // print out the information for ourselves\r
  //\r
  ShellPrintEx(\r
    -1,\r
    -1,\r
    FormatString,\r
    L"",\r
    ConvertHandleToHandleIndex(TheHandle),\r
    Name==NULL?L"Unknown":Name);\r
\r
  FreePool(FormatString);\r
  if (Name != NULL) {\r
    FreePool(Name);\r
  }\r
\r
  //\r
  // recurse on each child handle with IndentCharCount + 2\r
  //\r
  ParseHandleDatabaseForChildControllers(TheHandle, &ChildCount, &ChildHandleBuffer);\r
  for (LoopVar = 0 ; LoopVar < ChildCount && ShellStatus == SHELL_SUCCESS; LoopVar++){\r
    ShellStatus = DoDevTreeForHandle(ChildHandleBuffer[LoopVar], Lang, UseDevPaths, IndentCharCount+2, HiiString);\r
    if (ShellStatus == SHELL_ABORTED) {\r
      break;\r
    }\r
  }\r
\r
  if (ChildHandleBuffer != NULL) {\r
    FreePool(ChildHandleBuffer);\r
  }\r
\r
  return (ShellStatus);\r
}\r
\r
/**\r
  Function for 'devtree' command.\r
\r
  @param[in] ImageHandle  Handle to the Image (NULL if Internal).\r
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).\r
**/\r
SHELL_STATUS\r
EFIAPI\r
ShellCommandRunDevTree (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS          Status;\r
  LIST_ENTRY          *Package;\r
  CHAR16              *ProblemParam;\r
  SHELL_STATUS        ShellStatus;\r
  CHAR8               *Language;\r
  CONST CHAR16        *Lang;\r
  CHAR16              *HiiString;\r
  UINTN               LoopVar;\r
  EFI_HANDLE          TheHandle;\r
  BOOLEAN             FlagD;\r
  UINT64              Intermediate;\r
  UINTN               ParentControllerHandleCount;\r
  EFI_HANDLE          *ParentControllerHandleBuffer;\r
\r
  ShellStatus         = SHELL_SUCCESS;\r
  Status              = EFI_SUCCESS;\r
  Language                = NULL;\r
\r
  //\r
  // initialize the shell lib (we must be in non-auto-init...)\r
  //\r
  Status = ShellInitialize();\r
  ASSERT_EFI_ERROR(Status);\r
\r
  Status = CommandInit();\r
  ASSERT_EFI_ERROR(Status);\r
\r
  //\r
  // parse the command line\r
  //\r
  Status = ShellCommandLineParse (ParamList, &Package, &ProblemParam, TRUE);\r
  if (EFI_ERROR(Status)) {\r
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {\r
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellDriver1HiiHandle, L"devtree", ProblemParam);  \r
      FreePool(ProblemParam);\r
      ShellStatus = SHELL_INVALID_PARAMETER;\r
    } else {\r
      ASSERT(FALSE);\r
    }\r
  } else {\r
    if (ShellCommandLineGetCount(Package) > 2) {\r
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellDriver1HiiHandle, L"devtree");  \r
      ShellCommandLineFreeVarList (Package);\r
      return (SHELL_INVALID_PARAMETER);\r
    }\r
    Lang = ShellCommandLineGetValue(Package, L"-l");\r
    if (Lang != NULL) {\r
      Language = AllocateZeroPool(StrSize(Lang));\r
      AsciiSPrint(Language, StrSize(Lang), "%S", Lang);\r
    } else if (!ShellCommandLineGetFlag(Package, L"-l")){\r
      ASSERT(Language == NULL);\r
//      Language = AllocateZeroPool(10);\r
//      AsciiSPrint(Language, 10, "en-us");\r
    } else {\r
      ASSERT(Language == NULL);\r
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_NO_VALUE), gShellDriver1HiiHandle, L"devtree",  L"-l");  \r
      ShellCommandLineFreeVarList (Package);\r
      return (SHELL_INVALID_PARAMETER);\r
    }\r
    FlagD = ShellCommandLineGetFlag(Package, L"-d");\r
\r
    Lang = ShellCommandLineGetRawValue(Package, 1);\r
    HiiString = HiiGetString(gShellDriver1HiiHandle, STRING_TOKEN (STR_DEV_TREE_OUTPUT), Language);\r
\r
    if (Lang == NULL) {\r
      for (LoopVar = 1 ; ; LoopVar++){\r
        TheHandle = ConvertHandleIndexToHandle(LoopVar);\r
        if (TheHandle == NULL){\r
          break;\r
        }\r
\r
        //\r
        // Skip handles that do not have device path protocol\r
        //\r
        Status = gBS->OpenProtocol (\r
                      TheHandle,\r
                      &gEfiDevicePathProtocolGuid,\r
                      NULL,\r
                      NULL,\r
                      NULL,\r
                      EFI_OPEN_PROTOCOL_TEST_PROTOCOL\r
                     );\r
        if (EFI_ERROR (Status)) {\r
          continue;\r
        }\r
\r
        //\r
        // Skip handles that do have parents\r
        //\r
        ParentControllerHandleBuffer = NULL;\r
        Status = PARSE_HANDLE_DATABASE_PARENTS (\r
                   TheHandle,\r
                   &ParentControllerHandleCount,\r
                   &ParentControllerHandleBuffer\r
                   );\r
        SHELL_FREE_NON_NULL (ParentControllerHandleBuffer);\r
        if (ParentControllerHandleCount > 0) {\r
          continue;\r
        }\r
\r
        //\r
        // Start a devtree from TheHandle that has a device path and no parents\r
        //\r
        ShellStatus = DoDevTreeForHandle(TheHandle, Language, FlagD, 0, HiiString);\r
      }\r
    } else {\r
      Status = ShellConvertStringToUint64(Lang, &Intermediate, TRUE, FALSE);\r
      if (EFI_ERROR(Status) || ConvertHandleIndexToHandle((UINTN)Intermediate) == NULL) {\r
        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_INV_HANDLE), gShellDriver1HiiHandle, L"devtree", Lang);  \r
        ShellStatus = SHELL_INVALID_PARAMETER;\r
      } else {\r
        ShellStatus = DoDevTreeForHandle(ConvertHandleIndexToHandle((UINTN)Intermediate), Language, FlagD, 0, HiiString);\r
      }\r
    }\r
\r
    if (HiiString != NULL) {\r
      FreePool(HiiString);\r
    }\r
    SHELL_FREE_NON_NULL(Language);\r
    ShellCommandLineFreeVarList (Package);\r
  }\r
\r
  return (ShellStatus);\r
}\r