system76-edk2/ShellPkg/Library/UefiShellLevel2CommandsLib/UefiShellLevel2CommandsLib.c

/** @file
  Main file for NULL named library for level 2 shell command functions.

  these functions are:
  attrib,
  cd,
  cp,
  date*,
  time*,
  load,
  ls,
  map,
  mkdir,
  mv,
  parse,
  rm,
  reset,
  set,
  timezone*,
  vol

  * functions are non-interactive only

  Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/
#include "UefiShellLevel2CommandsLib.h"

CONST CHAR16    mFileName[]           = L"ShellCommands";
EFI_HII_HANDLE  gShellLevel2HiiHandle = NULL;

/**
  Get the filename to get help text from if not using HII.

  @retval The filename.
**/
CONST CHAR16 *
EFIAPI
ShellCommandGetManFileNameLevel2 (
  VOID
  )
{
  return (mFileName);
}

/**
  Constructor for the Shell Level 2 Commands library.

  Install the handlers for level 2 UEFI Shell 2.0 commands.

  @param ImageHandle    the image handle of the process
  @param SystemTable    the EFI System Table pointer

  @retval EFI_SUCCESS        the shell command handlers were installed successfully
  @retval EFI_UNSUPPORTED    the shell level required was not found.
**/
EFI_STATUS
EFIAPI
ShellLevel2CommandsLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  //
  // if shell level is less than 2 do nothing
  //
  if (PcdGet8 (PcdShellSupportLevel) < 2) {
    return (EFI_SUCCESS);
  }

  gShellLevel2HiiHandle = HiiAddPackages (&gShellLevel2HiiGuid, gImageHandle, UefiShellLevel2CommandsLibStrings, NULL);
  if (gShellLevel2HiiHandle == NULL) {
    return (EFI_DEVICE_ERROR);
  }

  //
  // install our shell command handlers that are always installed
  //
  ShellCommandRegisterCommandName (L"attrib", ShellCommandRunAttrib, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_ATTRIB));
  ShellCommandRegisterCommandName (L"cd", ShellCommandRunCd, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_CD));
  ShellCommandRegisterCommandName (L"cp", ShellCommandRunCp, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_CP));
  ShellCommandRegisterCommandName (L"load", ShellCommandRunLoad, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_LOAD));
  ShellCommandRegisterCommandName (L"map", ShellCommandRunMap, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_MAP));
  ShellCommandRegisterCommandName (L"mkdir", ShellCommandRunMkDir, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_MKDIR));
  ShellCommandRegisterCommandName (L"mv", ShellCommandRunMv, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_MV));
  ShellCommandRegisterCommandName (L"parse", ShellCommandRunParse, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_PARSE));
  ShellCommandRegisterCommandName (L"reset", ShellCommandRunReset, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_RESET));
  ShellCommandRegisterCommandName (L"set", ShellCommandRunSet, ShellCommandGetManFileNameLevel2, 2, L"", FALSE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_SET));
  ShellCommandRegisterCommandName (L"ls", ShellCommandRunLs, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_LS));
  ShellCommandRegisterCommandName (L"rm", ShellCommandRunRm, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_RM));
  ShellCommandRegisterCommandName (L"vol", ShellCommandRunVol, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_VOL));

  //
  // support for permanent (built in) aliases
  //
  ShellCommandRegisterAlias (L"rm", L"del");
  ShellCommandRegisterAlias (L"ls", L"dir");
  ShellCommandRegisterAlias (L"cp", L"copy");
  ShellCommandRegisterAlias (L"mkdir", L"md");
  ShellCommandRegisterAlias (L"cd ..", L"cd..");
  ShellCommandRegisterAlias (L"cd \\", L"cd\\");
  ShellCommandRegisterAlias (L"mv", L"ren");
  ShellCommandRegisterAlias (L"mv", L"move");
  ShellCommandRegisterAlias (L"map", L"mount");
  //
  // These are installed in level 2 or 3...
  //
  if ((PcdGet8 (PcdShellSupportLevel) == 2) || (PcdGet8 (PcdShellSupportLevel) == 3)) {
    ShellCommandRegisterCommandName (L"date", ShellCommandRunDate, ShellCommandGetManFileNameLevel2, PcdGet8 (PcdShellSupportLevel), L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_DATE));
    ShellCommandRegisterCommandName (L"time", ShellCommandRunTime, ShellCommandGetManFileNameLevel2, PcdGet8 (PcdShellSupportLevel), L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_TIME));
    ShellCommandRegisterCommandName (L"timezone", ShellCommandRunTimeZone, ShellCommandGetManFileNameLevel2, PcdGet8 (PcdShellSupportLevel), L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_TIMEZONE));
  } else {
    DEBUG_CODE_BEGIN ();
    //
    // we want to be able to test these so install them under a different name in debug mode...
    //
    ShellCommandRegisterCommandName (L"l2date", ShellCommandRunDate, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_DATE));
    ShellCommandRegisterCommandName (L"l2time", ShellCommandRunTime, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_TIME));
    ShellCommandRegisterCommandName (L"l2timezone", ShellCommandRunTimeZone, ShellCommandGetManFileNameLevel2, 2, L"", TRUE, gShellLevel2HiiHandle, STRING_TOKEN (STR_GET_HELP_TIMEZONE));
    DEBUG_CODE_END ();
  }

  return (EFI_SUCCESS);
}

/**
  Destructor for the library.  free any resources.

  @param ImageHandle    The image handle of the process.
  @param SystemTable    The EFI System Table pointer.

  @retval EFI_SUCCESS   Always returned.
**/
EFI_STATUS
EFIAPI
ShellLevel2CommandsLibDestructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  if (gShellLevel2HiiHandle != NULL) {
    HiiRemovePackages (gShellLevel2HiiHandle);
  }

  return (EFI_SUCCESS);
}

/**
  returns a fully qualified directory (contains a map drive at the beginning)
  path from a unknown directory path.

  If Path is already fully qualified this will return a duplicate otherwise this
  will use get the current directory and use that to build the fully qualified
  version.

  if the return value is not NULL it must be caller freed.

  @param[in] Path         The unknown Path Value

  @retval NULL            A memory allocation failed
  @retval NULL            A fully qualified path could not be discovered.
  @retval other           An allocated pointer to a fully qualified path.
**/
CHAR16 *
GetFullyQualifiedPath (
  IN CONST CHAR16  *Path
  )
{
  CHAR16        *PathToReturn;
  UINTN         Size;
  CONST CHAR16  *CurDir;

  PathToReturn = NULL;
  Size         = 0;

  ASSERT ((PathToReturn == NULL && Size == 0) || (PathToReturn != NULL));
  //
  // convert a local path to an absolute path
  //
  if (StrStr (Path, L":") == NULL) {
    CurDir = gEfiShellProtocol->GetCurDir (NULL);
    StrnCatGrow (&PathToReturn, &Size, CurDir, 0);
    StrnCatGrow (&PathToReturn, &Size, L"\\", 0);
    if (*Path == L'\\') {
      Path++;
    }
  }

  StrnCatGrow (&PathToReturn, &Size, Path, 0);

  PathCleanUpDirectories (PathToReturn);

  if (PathToReturn == NULL) {
    return NULL;
  }

  while (PathToReturn[StrLen (PathToReturn)-1] == L'*') {
    PathToReturn[StrLen (PathToReturn)-1] = CHAR_NULL;
  }

  return (PathToReturn);
}

/**
  Function to verify all intermediate directories in the path.

  @param[in] Path       The pointer to the path to fix.

  @retval EFI_SUCCESS   The operation was successful.
**/
EFI_STATUS
VerifyIntermediateDirectories (
  IN CONST CHAR16  *Path
  )
{
  EFI_STATUS         Status;
  CHAR16             *PathCopy;
  CHAR16             *TempSpot;
  SHELL_FILE_HANDLE  FileHandle;

  ASSERT (Path != NULL);

  Status     = EFI_SUCCESS;
  PathCopy   = NULL;
  PathCopy   = StrnCatGrow (&PathCopy, NULL, Path, 0);
  FileHandle = NULL;

  if (PathCopy == NULL) {
    return (EFI_OUT_OF_RESOURCES);
  }

  for (TempSpot = &PathCopy[StrLen (PathCopy)-1]; *TempSpot != CHAR_NULL && *TempSpot != L'\\'; TempSpot = &PathCopy[StrLen (PathCopy)-1]) {
    *TempSpot = CHAR_NULL;
  }

  if (*TempSpot == L'\\') {
    *TempSpot = CHAR_NULL;
  }

  if ((PathCopy != NULL) && (*PathCopy != CHAR_NULL)) {
    Status = VerifyIntermediateDirectories (PathCopy);

    if (PathCopy[StrLen (PathCopy)-1] != L':') {
      if (!EFI_ERROR (Status)) {
        Status = ShellOpenFileByName (PathCopy, &FileHandle, EFI_FILE_MODE_READ, 0);
        if (FileHandle != NULL) {
          ShellCloseFile (&FileHandle);
        }
      }
    }
  }

  SHELL_FREE_NON_NULL (PathCopy);

  return (Status);
}

/**
  String comparison without regard to case for a limited number of characters.

  @param[in] Source   The first item to compare.
  @param[in] Target   The second item to compare.
  @param[in] Count    How many characters to compare.

  @retval 0    Source and Target are identical strings without regard to case.
  @retval !=0  Source is not identical to Target.

**/
INTN
StrniCmp (
  IN CONST CHAR16  *Source,
  IN CONST CHAR16  *Target,
  IN CONST UINTN   Count
  )
{
  CHAR16  *SourceCopy;
  CHAR16  *TargetCopy;
  UINTN   SourceLength;
  UINTN   TargetLength;
  INTN    Result;

  if (Count == 0) {
    return 0;
  }

  SourceLength = StrLen (Source);
  TargetLength = StrLen (Target);
  SourceLength = MIN (SourceLength, Count);
  TargetLength = MIN (TargetLength, Count);
  SourceCopy   = AllocateCopyPool ((SourceLength + 1) * sizeof (CHAR16), Source);
  if (SourceCopy == NULL) {
    return -1;
  }

  TargetCopy = AllocateCopyPool ((TargetLength + 1) * sizeof (CHAR16), Target);
  if (TargetCopy == NULL) {
    FreePool (SourceCopy);
    return -1;
  }

  SourceCopy[SourceLength] = L'\0';
  TargetCopy[TargetLength] = L'\0';
  Result                   = gUnicodeCollation->StriColl (gUnicodeCollation, SourceCopy, TargetCopy);
  FreePool (SourceCopy);
  FreePool (TargetCopy);
  return Result;
}

/**
  Cleans off all the quotes in the string.

  @param[in]     OriginalString   pointer to the string to be cleaned.
  @param[out]   CleanString      The new string with all quotes removed.
                                                  Memory allocated in the function and free
                                                  by caller.

  @retval EFI_SUCCESS   The operation was successful.
**/
EFI_STATUS
ShellLevel2StripQuotes (
  IN  CONST CHAR16  *OriginalString,
  OUT CHAR16        **CleanString
  )
{
  CHAR16  *Walker;

  if ((OriginalString == NULL) || (CleanString == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  *CleanString = AllocateCopyPool (StrSize (OriginalString), OriginalString);
  if (*CleanString == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  for (Walker = *CleanString; Walker != NULL && *Walker != CHAR_NULL; Walker++) {
    if (*Walker == L'\"') {
      CopyMem (Walker, Walker+1, StrSize (Walker) - sizeof (Walker[0]));
    }
  }

  return EFI_SUCCESS;
}