ShellPkg/Library/UefiShellLevel2CommandsLib/Cd.c

/** @file
  Main file for attrib shell level 2 function.

  (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
  (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
  Copyright (c) 2009 - 2017, 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 "UefiShellLevel2CommandsLib.h"

/**
  Function will replace drive identifier with CWD.

  If FullPath begining with ':' is invalid path, then ASSERT.
  If FullPath not include dirve identifier , then do nothing.
  If FullPath likes "fs0:\xx" or "fs0:/xx" , then do nothing.
  If FullPath likes "fs0:xxx" or "fs0:", the drive replaced by CWD.

  @param[in, out]   FullPath    The pointer to the string containing the path.
  @param[in]        Cwd         Current directory.

  @retval   EFI_SUCCESS         Success.
  @retval   EFI_OUT_OF_SOURCES  A memory allocation failed.
**/
EFI_STATUS
ReplaceDriveWithCwd (
  IN OUT    CHAR16  **FullPath,
  IN CONST  CHAR16  *Cwd
  )
{
  CHAR16        *Splitter;
  CHAR16        *TempBuffer;
  UINTN         TotalSize;

  Splitter   = NULL;
  TempBuffer = NULL;
  TotalSize  = 0;

  if (FullPath == NULL || *FullPath == NULL) {
    return EFI_SUCCESS;
  }

  Splitter = StrStr (*FullPath, L":");
  ASSERT(Splitter != *FullPath);

  if (Splitter != NULL && *(Splitter + 1) != L'\\' && *(Splitter + 1) != L'/') {
    TotalSize = StrSize (Cwd) + StrSize (Splitter + 1);
    TempBuffer = AllocateZeroPool (TotalSize);
    if (TempBuffer == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }

    StrCpyS (TempBuffer, TotalSize / sizeof(CHAR16), Cwd);
    StrCatS (TempBuffer, TotalSize / sizeof(CHAR16), L"\\");
    StrCatS (TempBuffer, TotalSize / sizeof(CHAR16), Splitter + 1);

    FreePool(*FullPath);
    *FullPath = TempBuffer;
  }

  return EFI_SUCCESS;
}

/**
  function to determine if FullPath is under current filesystem.

  @param[in]    FullPath    The target location to determine.
  @param[in]    Cwd         Current directory.

  @retval       TRUE        The FullPath is in the current filesystem.
  @retval       FALSE       The FullPaht isn't in the current filesystem.
**/
BOOLEAN
IsCurrentFileSystem (
  IN CONST CHAR16   *FullPath,
  IN CONST CHAR16   *Cwd
  )
{
  CHAR16 *Splitter1;
  CHAR16 *Splitter2;

  Splitter1 = NULL;
  Splitter2 = NULL;

  ASSERT(FullPath != NULL);

  Splitter1 = StrStr (FullPath, L":");
  if (Splitter1 == NULL) {
    return TRUE;
  }

  Splitter2 = StrStr (Cwd, L":");

  if (((UINTN) Splitter1 - (UINTN) FullPath) != ((UINTN) Splitter2 - (UINTN) Cwd)) {
    return FALSE;
  } else {
    if (StrniCmp (FullPath, Cwd, ((UINTN) Splitter1 - (UINTN) FullPath) / sizeof (CHAR16)) == NULL) {
      return TRUE;
    } else {
      return FALSE;
    }
  }
}

/**
  Extract drive string and path string from FullPath.

  The caller must be free Drive and Path.

  @param[in]    FullPath    A path to be extracted.
  @param[out]   Drive       Buffer to save drive identifier.
  @param[out]   Path        Buffer to save path.

  @retval       EFI_SUCCESS           Success.
  @retval       EFI_OUT_OF_RESOUCES   A memory allocation failed.
**/
EFI_STATUS
ExtractDriveAndPath (
  IN CONST CHAR16   *FullPath,
  OUT CHAR16        **Drive,
  OUT CHAR16        **Path
  )
{
  CHAR16 *Splitter;

  ASSERT (FullPath != NULL);

  Splitter = StrStr (FullPath, L":");

  if (Splitter == NULL) {
    *Drive = NULL;
    *Path = AllocateCopyPool (StrSize (FullPath), FullPath);
    if (*Path == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }
  } else {
    if (*(Splitter + 1) == CHAR_NULL) {
      *Drive = AllocateCopyPool (StrSize (FullPath), FullPath);
      *Path = NULL;
      if (*Drive == NULL) {
        return EFI_OUT_OF_RESOURCES;
      }
    } else {
      *Drive = AllocateCopyPool ((Splitter - FullPath + 2) * sizeof(CHAR16), FullPath);
      if (*Drive == NULL) {
        return EFI_OUT_OF_RESOURCES;
      }
      (*Drive)[Splitter - FullPath + 1] = CHAR_NULL;

      *Path = AllocateCopyPool (StrSize (Splitter + 1), Splitter + 1);
      if (*Path == NULL) {
        FreePool (*Drive);
        return EFI_OUT_OF_RESOURCES;
      }
    }
  }

  return EFI_SUCCESS;
}

/**
  Function for 'cd' command.

  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
**/
SHELL_STATUS
EFIAPI
ShellCommandRunCd (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS        Status;
  LIST_ENTRY        *Package;
  CONST CHAR16      *Cwd;
  CHAR16            *Path;
  CHAR16            *Drive;
  CHAR16            *ProblemParam;
  SHELL_STATUS      ShellStatus;
  CONST CHAR16      *Param1;
  CHAR16            *Param1Copy;
  CHAR16            *Walker;
  CHAR16            *Splitter;
  CHAR16            *TempBuffer;
  UINTN             TotalSize;

  ProblemParam  = NULL;
  ShellStatus   = SHELL_SUCCESS;
  Cwd           = NULL;
  Path          = NULL;
  Drive         = NULL;
  Splitter      = NULL;
  TempBuffer    = NULL;
  TotalSize     = 0;

  Status = CommandInit();
  ASSERT_EFI_ERROR(Status);

  //
  // initialize the shell lib (we must be in non-auto-init...)
  //
  Status = ShellInitialize();
  ASSERT_EFI_ERROR(Status);

  //
  // parse the command line
  //
  Status = ShellCommandLineParse (EmptyParamList, &Package, &ProblemParam, TRUE);
  if (EFI_ERROR(Status)) {
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellLevel2HiiHandle, L"cd", ProblemParam);  
      FreePool(ProblemParam);
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      ASSERT(FALSE);
    }
  }

  //
  // check for "-?"
  //
  if (ShellCommandLineGetFlag(Package, L"-?")) {
    ASSERT(FALSE);
  } else if (ShellCommandLineGetRawValue(Package, 2) != NULL) {
    ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellLevel2HiiHandle, L"cd");  
    ShellStatus = SHELL_INVALID_PARAMETER;
  } else {
    //
    // remember that param 0 is the command name
    // If there are 0 value parameters, then print the current directory
    // else If there are 2 value parameters, then print the error message
    // else If there is  1 value paramerer , then change the directory
    //
    Cwd = ShellGetCurrentDir (NULL);
    if (Cwd == NULL) {
      ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN(STR_GEN_NO_CWD), gShellLevel2HiiHandle, L"cd");
      ShellStatus = SHELL_NOT_FOUND;
    } else {
      Param1 = ShellCommandLineGetRawValue (Package, 1);
      if (Param1 == NULL) {
        //
        // display the current directory
        //
        ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN(STR_CD_PRINT), gShellLevel2HiiHandle, Cwd);
      } else {
        Param1Copy = CatSPrint (NULL, L"%s", Param1, NULL);
        for (Walker = Param1Copy; Walker != NULL && *Walker != CHAR_NULL; Walker++) {
          if (*Walker == L'\"') {
            CopyMem (Walker, Walker + 1, StrSize(Walker) - sizeof(Walker[0]));
          }
        }

        if (Param1Copy != NULL && IsCurrentFileSystem (Param1Copy, Cwd)) {
          Status = ReplaceDriveWithCwd (&Param1Copy,Cwd);
          if (!EFI_ERROR (Status)) {
            Param1Copy = PathCleanUpDirectories (Param1Copy);
          }
        } else {
          //
          // Can't use cd command to change filesystem.
          //
          ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_CD_NF), gShellLevel2HiiHandle, L"cd");
          Status = EFI_NOT_FOUND;
        }

        if (!EFI_ERROR(Status) && Param1Copy != NULL) {
          Splitter = StrStr (Cwd, L":");
          if (Param1Copy[0] == L'\\') {
            //
            // Absolute Path on current drive letter.
            //
            TotalSize = ((Splitter - Cwd + 1) * sizeof(CHAR16)) + StrSize(Param1Copy);
            TempBuffer = AllocateZeroPool (TotalSize);
            if (TempBuffer == NULL) {
              Status = EFI_OUT_OF_RESOURCES;
            } else {
              StrnCpyS (TempBuffer, TotalSize / sizeof(CHAR16), Cwd, (Splitter - Cwd + 1));
              StrCatS (TempBuffer, TotalSize / sizeof(CHAR16), Param1Copy);

              FreePool (Param1Copy);
              Param1Copy = TempBuffer;
              TempBuffer = NULL;
            }
          } else {
            if (StrStr (Param1Copy,L":") == NULL) {
              TotalSize = StrSize (Cwd) + StrSize (Param1Copy);
              TempBuffer = AllocateZeroPool (TotalSize);
              if (TempBuffer == NULL) {
                Status = EFI_OUT_OF_RESOURCES;
              } else {
                StrCpyS (TempBuffer, TotalSize / sizeof (CHAR16), Cwd);
                StrCatS (TempBuffer, TotalSize / sizeof (CHAR16), L"\\");
                StrCatS (TempBuffer, TotalSize / sizeof (CHAR16), Param1Copy);

                FreePool (Param1Copy);
                Param1Copy = PathCleanUpDirectories (TempBuffer);
              }
            }
          }
        }

        if (!EFI_ERROR(Status)) {
          Status = ExtractDriveAndPath (Param1Copy, &Drive, &Path);
        }

        if (!EFI_ERROR (Status) && Drive != NULL && Path != NULL) {
          if (EFI_ERROR(ShellIsDirectory (Param1Copy))) {
            ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN(STR_GEN_NOT_DIR), gShellLevel2HiiHandle, L"cd", Param1Copy);
            ShellStatus = SHELL_NOT_FOUND;
          } else {
            Status = gEfiShellProtocol->SetCurDir (Drive, Path + 1);
            if (EFI_ERROR (Status)) {
              ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN(STR_GEN_DIR_NF), gShellLevel2HiiHandle, L"cd", Param1Copy);
              ShellStatus = SHELL_NOT_FOUND;
            }
          }
        }

        if (Drive != NULL) {
          FreePool (Drive);
        }

        if (Path != NULL) {
          FreePool (Path);
        }

        FreePool (Param1Copy);
      }
    }
  }

  //
  // free the command line package
  //
  ShellCommandLineFreeVarList (Package);

  //
  // return the status
  //
  return (ShellStatus);
}