ShellPkg/Application/Shell/ShellProtocol.h

   1 /** @file
   2   Member functions of EFI_SHELL_PROTOCOL and functions for creation,
   3   manipulation, and initialization of EFI_SHELL_PROTOCOL.
   4
   5   (C) Copyright 2014 Hewlett-Packard Development Company, L.P.<BR>
   6   Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #ifndef _SHELL_PROTOCOL_HEADER_
  12 #define _SHELL_PROTOCOL_HEADER_
  13
  14 #include "Shell.h"
  15
  16 typedef struct {
  17   LIST_ENTRY            Link;
  18   EFI_SHELL_PROTOCOL    *Interface;
  19   EFI_HANDLE            Handle;
  20 } SHELL_PROTOCOL_HANDLE_LIST;
  21
  22 // flags values...
  23 #define SHELL_MAP_FLAGS_CONSIST  BIT1
  24
  25 /**
  26   Function to create and install on the current handle.
  27
  28   Will overwrite any existing ShellProtocols in the system to be sure that
  29   the current shell is in control.
  30
  31   This must be removed via calling CleanUpShellProtocol().
  32
  33   @param[in, out] NewShell   The pointer to the pointer to the structure
  34   to install.
  35
  36   @retval EFI_SUCCESS     The operation was successful.
  37   @return                 An error from LocateHandle, CreateEvent, or other core function.
  38 **/
  39 EFI_STATUS
  40 CreatePopulateInstallShellProtocol (
  41   IN OUT EFI_SHELL_PROTOCOL  **NewShell
  42   );
  43
  44 /**
  45   Opposite of CreatePopulateInstallShellProtocol.
  46
  47   Free all memory and restore the system to the state it was in before calling
  48   CreatePopulateInstallShellProtocol.
  49
  50   @param[in, out] NewShell   The pointer to the new shell protocol structure.
  51
  52   @retval EFI_SUCCESS       The operation was successful.
  53 **/
  54 EFI_STATUS
  55 CleanUpShellProtocol (
  56   IN OUT EFI_SHELL_PROTOCOL  *NewShell
  57   );
  58
  59 /**
  60   Cleanup the shell environment.
  61
  62   @param[in, out] NewShell   The pointer to the new shell protocol structure.
  63
  64   @retval EFI_SUCCESS       The operation was successful.
  65 **/
  66 EFI_STATUS
  67 CleanUpShellEnvironment (
  68   IN OUT EFI_SHELL_PROTOCOL  *NewShell
  69   );
  70
  71 /**
  72   This function creates a mapping for a device path.
  73
  74   @param DevicePath             Points to the device path. If this is NULL and Mapping points to a valid mapping,
  75                                 then the mapping will be deleted.
  76   @param Mapping                Points to the NULL-terminated mapping for the device path.  Must end with a ':'
  77
  78   @retval EFI_SUCCESS           Mapping created or deleted successfully.
  79   @retval EFI_NO_MAPPING        There is no handle that corresponds exactly to DevicePath. See the
  80                                 boot service function LocateDevicePath().
  81   @retval EFI_ACCESS_DENIED     The mapping is a built-in alias.
  82   @retval EFI_INVALID_PARAMETER Mapping was NULL
  83   @retval EFI_INVALID_PARAMETER Mapping did not end with a ':'
  84   @retval EFI_INVALID_PARAMETER DevicePath was not pointing at a device that had a SIMPLE_FILE_SYSTEM_PROTOCOL installed.
  85   @retval EFI_NOT_FOUND         There was no mapping found to delete
  86   @retval EFI_OUT_OF_RESOURCES  Memory allocation failed
  87 **/
  88 EFI_STATUS
  89 EFIAPI
  90 EfiShellSetMap (
  91   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath OPTIONAL,
  92   IN CONST CHAR16                    *Mapping
  93   );
  94
  95 /**
  96   Gets the device path from the mapping.
  97
  98   This function gets the device path associated with a mapping.
  99
 100   @param Mapping                A pointer to the mapping
 101
 102   @retval !=NULL                Pointer to the device path that corresponds to the
 103                                 device mapping. The returned pointer does not need
 104                                 to be freed.
 105   @retval NULL                  There is no device path associated with the
 106                                 specified mapping.
 107 **/
 108 CONST EFI_DEVICE_PATH_PROTOCOL *
 109 EFIAPI
 110 EfiShellGetDevicePathFromMap (
 111   IN CONST CHAR16  *Mapping
 112   );
 113
 114 /**
 115   Gets the mapping that most closely matches the device path.
 116
 117   This function gets the mapping which corresponds to the device path *DevicePath. If
 118   there is no exact match, then the mapping which most closely matches *DevicePath
 119   is returned, and *DevicePath is updated to point to the remaining portion of the
 120   device path. If there is an exact match, the mapping is returned and *DevicePath
 121   points to the end-of-device-path node.
 122
 123   @param DevicePath             On entry, points to a device path pointer. On
 124                                 exit, updates the pointer to point to the
 125                                 portion of the device path after the mapping.
 126
 127   @retval NULL                  No mapping was found.
 128   @return !=NULL                Pointer to NULL-terminated mapping. The buffer
 129                                 is callee allocated and should be freed by the caller.
 130 **/
 131 CONST CHAR16 *
 132 EFIAPI
 133 EfiShellGetMapFromDevicePath (
 134   IN OUT EFI_DEVICE_PATH_PROTOCOL  **DevicePath
 135   );
 136
 137 /**
 138   Converts a device path to a file system-style path.
 139
 140   This function converts a device path to a file system path by replacing part, or all, of
 141   the device path with the file-system mapping. If there are more than one application
 142   file system mappings, the one that most closely matches Path will be used.
 143
 144   @param Path                   The pointer to the device path
 145
 146   @retval NULL                  the device path could not be found.
 147   @return all                   The pointer of the NULL-terminated file path. The path
 148                                 is callee-allocated and should be freed by the caller.
 149 **/
 150 CHAR16 *
 151 EFIAPI
 152 EfiShellGetFilePathFromDevicePath (
 153   IN CONST EFI_DEVICE_PATH_PROTOCOL  *Path
 154   );
 155
 156 /**
 157   Converts a file system style name to a device path.
 158
 159   This function converts a file system style name to a device path, by replacing any
 160   mapping references to the associated device path.
 161
 162   @param Path                   the pointer to the path
 163
 164   @return all                   The pointer of the file path. The file path is callee
 165                                 allocated and should be freed by the caller.
 166 **/
 167 EFI_DEVICE_PATH_PROTOCOL *
 168 EFIAPI
 169 EfiShellGetDevicePathFromFilePath (
 170   IN CONST CHAR16  *Path
 171   );
 172
 173 /**
 174   Gets the name of the device specified by the device handle.
 175
 176   This function gets the user-readable name of the device specified by the device
 177   handle. If no user-readable name could be generated, then *BestDeviceName will be
 178   NULL and EFI_NOT_FOUND will be returned.
 179
 180   If EFI_DEVICE_NAME_USE_COMPONENT_NAME is set, then the function will return the
 181   device's name using the EFI_COMPONENT_NAME2_PROTOCOL, if present on
 182   DeviceHandle.
 183
 184   If EFI_DEVICE_NAME_USE_DEVICE_PATH is set, then the function will return the
 185   device's name using the EFI_DEVICE_PATH_PROTOCOL, if present on DeviceHandle.
 186   If both EFI_DEVICE_NAME_USE_COMPONENT_NAME and
 187   EFI_DEVICE_NAME_USE_DEVICE_PATH are set, then
 188   EFI_DEVICE_NAME_USE_COMPONENT_NAME will have higher priority.
 189
 190   @param DeviceHandle           The handle of the device.
 191   @param Flags                  Determines the possible sources of component names.
 192                                 Valid bits are:
 193                                   EFI_DEVICE_NAME_USE_COMPONENT_NAME
 194                                   EFI_DEVICE_NAME_USE_DEVICE_PATH
 195   @param Language               A pointer to the language specified for the device
 196                                 name, in the same format as described in the UEFI
 197                                 specification, Appendix M
 198   @param BestDeviceName         On return, points to the callee-allocated NULL-
 199                                 terminated name of the device. If no device name
 200                                 could be found, points to NULL. The name must be
 201                                 freed by the caller...
 202
 203   @retval EFI_SUCCESS           Get the name successfully.
 204   @retval EFI_NOT_FOUND         Fail to get the device name.
 205   @retval EFI_INVALID_PARAMETER Flags did not have a valid bit set.
 206   @retval EFI_INVALID_PARAMETER BestDeviceName was NULL
 207   @retval EFI_INVALID_PARAMETER DeviceHandle was NULL
 208 **/
 209 EFI_STATUS
 210 EFIAPI
 211 EfiShellGetDeviceName (
 212   IN EFI_HANDLE                   DeviceHandle,
 213   IN EFI_SHELL_DEVICE_NAME_FLAGS  Flags,
 214   IN CHAR8                        *Language,
 215   OUT CHAR16                      **BestDeviceName
 216   );
 217
 218 /**
 219   Opens the root directory of a device on a handle
 220
 221   This function opens the root directory of a device and returns a file handle to it.
 222
 223   @param DeviceHandle           The handle of the device that contains the volume.
 224   @param FileHandle             On exit, points to the file handle corresponding to the root directory on the
 225                                 device.
 226
 227   @retval EFI_SUCCESS           Root opened successfully.
 228   @retval EFI_NOT_FOUND         EFI_SIMPLE_FILE_SYSTEM could not be found or the root directory
 229                                 could not be opened.
 230   @retval EFI_VOLUME_CORRUPTED  The data structures in the volume were corrupted.
 231   @retval EFI_DEVICE_ERROR      The device had an error
 232 **/
 233 EFI_STATUS
 234 EFIAPI
 235 EfiShellOpenRootByHandle (
 236   IN EFI_HANDLE          DeviceHandle,
 237   OUT SHELL_FILE_HANDLE  *FileHandle
 238   );
 239
 240 /**
 241   Opens the root directory of a device.
 242
 243   This function opens the root directory of a device and returns a file handle to it.
 244
 245   @param DevicePath             Points to the device path corresponding to the device where the
 246                                 EFI_SIMPLE_FILE_SYSTEM_PROTOCOL is installed.
 247   @param FileHandle             On exit, points to the file handle corresponding to the root directory on the
 248                                 device.
 249
 250   @retval EFI_SUCCESS           Root opened successfully.
 251   @retval EFI_NOT_FOUND         EFI_SIMPLE_FILE_SYSTEM could not be found or the root directory
 252                                 could not be opened.
 253   @retval EFI_VOLUME_CORRUPTED  The data structures in the volume were corrupted.
 254   @retval EFI_DEVICE_ERROR      The device had an error
 255 **/
 256 EFI_STATUS
 257 EFIAPI
 258 EfiShellOpenRoot (
 259   IN EFI_DEVICE_PATH_PROTOCOL  *DevicePath,
 260   OUT SHELL_FILE_HANDLE        *FileHandle
 261   );
 262
 263 /**
 264   Returns whether any script files are currently being processed.
 265
 266   @retval TRUE                 There is at least one script file active.
 267   @retval FALSE                No script files are active now.
 268
 269 **/
 270 BOOLEAN
 271 EFIAPI
 272 EfiShellBatchIsActive (
 273   VOID
 274   );
 275
 276 /**
 277   Worker function to open a file based on a device path.  this will open the root
 278   of the volume and then traverse down to the file itself.
 279
 280   @param DevicePath2                 Device Path of the file
 281   @param FileHandle               Pointer to the file upon a successful return
 282   @param OpenMode                 mode to open file in.
 283   @param Attributes               the File Attributes to use when creating a new file
 284
 285   @retval EFI_SUCCESS             the file is open and FileHandle is valid
 286   @retval EFI_UNSUPPORTED         the device path contained non-path elements
 287   @retval other                   an error occurred.
 288 **/
 289 EFI_STATUS
 290 InternalOpenFileDevicePath (
 291   IN OUT EFI_DEVICE_PATH_PROTOCOL  *DevicePath2,
 292   OUT SHELL_FILE_HANDLE            *FileHandle,
 293   IN UINT64                        OpenMode,
 294   IN UINT64                        Attributes OPTIONAL
 295   );
 296
 297 /**
 298   Creates a file or directory by name.
 299
 300   This function creates an empty new file or directory with the specified attributes and
 301   returns the new file's handle. If the file already exists and is read-only, then
 302   EFI_INVALID_PARAMETER will be returned.
 303
 304   If the file already existed, it is truncated and its attributes updated. If the file is
 305   created successfully, the FileHandle is the file's handle, else, the FileHandle is NULL.
 306
 307   If the file name begins with >v, then the file handle which is returned refers to the
 308   shell environment variable with the specified name. If the shell environment variable
 309   already exists and is non-volatile then EFI_INVALID_PARAMETER is returned.
 310
 311   @param FileName           Pointer to NULL-terminated file path
 312   @param FileAttribs        The new file's attributes.  the different attributes are
 313                             described in EFI_FILE_PROTOCOL.Open().
 314   @param FileHandle         On return, points to the created file handle or directory's handle
 315
 316   @retval EFI_SUCCESS       The file was opened.  FileHandle points to the new file's handle.
 317   @retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
 318   @retval EFI_UNSUPPORTED   could not open the file path
 319   @retval EFI_NOT_FOUND     the specified file could not be found on the devide, or could not
 320                             file the file system on the device.
 321   @retval EFI_NO_MEDIA      the device has no medium.
 322   @retval EFI_MEDIA_CHANGED The device has a different medium in it or the medium is no
 323                             longer supported.
 324   @retval EFI_DEVICE_ERROR The device reported an error or can't get the file path according
 325                             the DirName.
 326   @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
 327   @retval EFI_WRITE_PROTECTED An attempt was made to create a file, or open a file for write
 328                             when the media is write-protected.
 329   @retval EFI_ACCESS_DENIED The service denied access to the file.
 330   @retval EFI_OUT_OF_RESOURCES Not enough resources were available to open the file.
 331   @retval EFI_VOLUME_FULL   The volume is full.
 332 **/
 333 EFI_STATUS
 334 EFIAPI
 335 EfiShellCreateFile (
 336   IN CONST CHAR16        *FileName,
 337   IN UINT64              FileAttribs,
 338   OUT SHELL_FILE_HANDLE  *FileHandle
 339   );
 340
 341 /**
 342   Opens a file or a directory by file name.
 343
 344   This function opens the specified file in the specified OpenMode and returns a file
 345   handle.
 346   If the file name begins with >v, then the file handle which is returned refers to the
 347   shell environment variable with the specified name. If the shell environment variable
 348   exists, is non-volatile and the OpenMode indicates EFI_FILE_MODE_WRITE, then
 349   EFI_INVALID_PARAMETER is returned.
 350
 351   If the file name is >i, then the file handle which is returned refers to the standard
 352   input. If the OpenMode indicates EFI_FILE_MODE_WRITE, then EFI_INVALID_PARAMETER
 353   is returned.
 354
 355   If the file name is >o, then the file handle which is returned refers to the standard
 356   output. If the OpenMode indicates EFI_FILE_MODE_READ, then EFI_INVALID_PARAMETER
 357   is returned.
 358
 359   If the file name is >e, then the file handle which is returned refers to the standard
 360   error. If the OpenMode indicates EFI_FILE_MODE_READ, then EFI_INVALID_PARAMETER
 361   is returned.
 362
 363   If the file name is NUL, then the file handle that is returned refers to the standard NUL
 364   file. If the OpenMode indicates EFI_FILE_MODE_READ, then EFI_INVALID_PARAMETER is
 365   returned.
 366
 367   If return EFI_SUCCESS, the FileHandle is the opened file's handle, else, the
 368   FileHandle is NULL.
 369
 370   @param FileName               Points to the NULL-terminated UCS-2 encoded file name.
 371   @param FileHandle             On return, points to the file handle.
 372   @param OpenMode               File open mode. Either EFI_FILE_MODE_READ or
 373                                 EFI_FILE_MODE_WRITE from section 12.4 of the UEFI
 374                                 Specification.
 375   @retval EFI_SUCCESS           The file was opened. FileHandle has the opened file's handle.
 376   @retval EFI_INVALID_PARAMETER One of the parameters has an invalid value. FileHandle is NULL.
 377   @retval EFI_UNSUPPORTED       Could not open the file path. FileHandle is NULL.
 378   @retval EFI_NOT_FOUND         The specified file could not be found on the device or the file
 379                                 system could not be found on the device. FileHandle is NULL.
 380   @retval EFI_NO_MEDIA          The device has no medium. FileHandle is NULL.
 381   @retval EFI_MEDIA_CHANGED     The device has a different medium in it or the medium is no
 382                                 longer supported. FileHandle is NULL.
 383   @retval EFI_DEVICE_ERROR      The device reported an error or can't get the file path according
 384                                 the FileName. FileHandle is NULL.
 385   @retval EFI_VOLUME_CORRUPTED  The file system structures are corrupted. FileHandle is NULL.
 386   @retval EFI_WRITE_PROTECTED   An attempt was made to create a file, or open a file for write
 387                                 when the media is write-protected. FileHandle is NULL.
 388   @retval EFI_ACCESS_DENIED     The service denied access to the file. FileHandle is NULL.
 389   @retval EFI_OUT_OF_RESOURCES  Not enough resources were available to open the file. FileHandle
 390                                 is NULL.
 391   @retval EFI_VOLUME_FULL       The volume is full. FileHandle is NULL.
 392 **/
 393 EFI_STATUS
 394 EFIAPI
 395 EfiShellOpenFileByName (
 396   IN CONST CHAR16        *FileName,
 397   OUT SHELL_FILE_HANDLE  *FileHandle,
 398   IN UINT64              OpenMode
 399   );
 400
 401 /**
 402   Deletes the file specified by the file name.
 403
 404   This function deletes a file.
 405
 406   @param FileName                 Points to the NULL-terminated file name.
 407
 408   @retval EFI_SUCCESS             The file was closed and deleted, and the handle was closed.
 409   @retval EFI_WARN_DELETE_FAILURE The handle was closed but the file was not deleted.
 410   @sa EfiShellCreateFile
 411   @sa FileHandleDelete
 412 **/
 413 EFI_STATUS
 414 EFIAPI
 415 EfiShellDeleteFileByName (
 416   IN CONST CHAR16  *FileName
 417   );
 418
 419 /**
 420   Disables the page break output mode.
 421 **/
 422 VOID
 423 EFIAPI
 424 EfiShellDisablePageBreak (
 425   VOID
 426   );
 427
 428 /**
 429   Enables the page break output mode.
 430 **/
 431 VOID
 432 EFIAPI
 433 EfiShellEnablePageBreak (
 434   VOID
 435   );
 436
 437 /**
 438   internal worker function to run a command via Device Path
 439
 440   @param ParentImageHandle      A handle of the image that is executing the specified
 441                                 command line.
 442   @param DevicePath             device path of the file to execute
 443   @param CommandLine            Points to the NULL-terminated UCS-2 encoded string
 444                                 containing the command line. If NULL then the command-
 445                                 line will be empty.
 446   @param Environment            Points to a NULL-terminated array of environment
 447                                 variables with the format 'x=y', where x is the
 448                                 environment variable name and y is the value. If this
 449                                 is NULL, then the current shell environment is used.
 450   @param[out] StartImageStatus  Returned status from gBS->StartImage.
 451
 452   @retval EFI_SUCCESS       The command executed successfully. The  status code
 453                             returned by the command is pointed to by StatusCode.
 454   @retval EFI_INVALID_PARAMETER The parameters are invalid.
 455   @retval EFI_OUT_OF_RESOURCES Out of resources.
 456   @retval EFI_UNSUPPORTED   Nested shell invocations are not allowed.
 457 **/
 458 EFI_STATUS
 459 InternalShellExecuteDevicePath (
 460   IN CONST EFI_HANDLE                *ParentImageHandle,
 461   IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath,
 462   IN CONST CHAR16                    *CommandLine OPTIONAL,
 463   IN CONST CHAR16                    **Environment OPTIONAL,
 464   OUT EFI_STATUS                     *StartImageStatus OPTIONAL
 465   );
 466
 467 /**
 468   Execute the command line.
 469
 470   This function creates a nested instance of the shell and executes the specified
 471   command (CommandLine) with the specified environment (Environment). Upon return,
 472   the status code returned by the specified command is placed in StatusCode.
 473
 474   If Environment is NULL, then the current environment is used and all changes made
 475   by the commands executed will be reflected in the current environment. If the
 476   Environment is non-NULL, then the changes made will be discarded.
 477
 478   The CommandLine is executed from the current working directory on the current
 479   device.
 480
 481   @param ParentImageHandle      A handle of the image that is executing the specified
 482                                 command line.
 483   @param CommandLine            Points to the NULL-terminated UCS-2 encoded string
 484                                 containing the command line. If NULL then the command-
 485                                 line will be empty.
 486   @param Environment            Points to a NULL-terminated array of environment
 487                                 variables with the format 'x=y', where x is the
 488                                 environment variable name and y is the value. If this
 489                                 is NULL, then the current shell environment is used.
 490   @param StatusCode             Points to the status code returned by the command.
 491
 492   @retval EFI_SUCCESS           The command executed successfully. The  status code
 493                                 returned by the command is pointed to by StatusCode.
 494   @retval EFI_INVALID_PARAMETER The parameters are invalid.
 495   @retval EFI_OUT_OF_RESOURCES  Out of resources.
 496   @retval EFI_UNSUPPORTED       Nested shell invocations are not allowed.
 497 **/
 498 EFI_STATUS
 499 EFIAPI
 500 EfiShellExecute (
 501   IN EFI_HANDLE   *ParentImageHandle,
 502   IN CHAR16       *CommandLine OPTIONAL,
 503   IN CHAR16       **Environment OPTIONAL,
 504   OUT EFI_STATUS  *StatusCode OPTIONAL
 505   );
 506
 507 /**
 508   Utility cleanup function for EFI_SHELL_FILE_INFO objects.
 509
 510   1) frees all pointers (non-NULL)
 511   2) Closes the SHELL_FILE_HANDLE
 512
 513   @param FileListNode     pointer to the list node to free
 514 **/
 515 VOID
 516 FreeShellFileInfoNode (
 517   IN EFI_SHELL_FILE_INFO  *FileListNode
 518   );
 519
 520 /**
 521   Frees the file list.
 522
 523   This function cleans up the file list and any related data structures. It has no
 524   impact on the files themselves.
 525
 526   @param FileList               The file list to free. Type EFI_SHELL_FILE_INFO is
 527                                 defined in OpenFileList()
 528
 529   @retval EFI_SUCCESS           Free the file list successfully.
 530   @retval EFI_INVALID_PARAMETER FileList was NULL or *FileList was NULL;
 531 **/
 532 EFI_STATUS
 533 EFIAPI
 534 EfiShellFreeFileList (
 535   IN EFI_SHELL_FILE_INFO  **FileList
 536   );
 537
 538 /**
 539   Deletes the duplicate file names files in the given file list.
 540
 541   This function deletes the reduplicate files in the given file list.
 542
 543   @param FileList               A pointer to the first entry in the file list.
 544
 545   @retval EFI_SUCCESS           Always success.
 546   @retval EFI_INVALID_PARAMETER FileList was NULL or *FileList was NULL;
 547 **/
 548 EFI_STATUS
 549 EFIAPI
 550 EfiShellRemoveDupInFileList (
 551   IN EFI_SHELL_FILE_INFO  **FileList
 552   );
 553
 554 /**
 555   Allocates and populates a EFI_SHELL_FILE_INFO structure.  if any memory operation
 556   failed it will return NULL.
 557
 558   @param[in] BasePath         the Path to prepend onto filename for FullPath
 559   @param[in] Status           Status member initial value.
 560   @param[in] FileName         FileName member initial value.
 561   @param[in] Handle           Handle member initial value.
 562   @param[in] Info             Info struct to copy.
 563
 564 **/
 565 EFI_SHELL_FILE_INFO *
 566 CreateAndPopulateShellFileInfo (
 567   IN CONST CHAR16             *BasePath,
 568   IN CONST EFI_STATUS         Status,
 569   IN CONST CHAR16             *FileName,
 570   IN CONST SHELL_FILE_HANDLE  Handle,
 571   IN CONST EFI_FILE_INFO      *Info
 572   );
 573
 574 /**
 575   Find all files in a specified directory.
 576
 577   @param FileDirHandle     Handle of the directory to search.
 578   @param FileList          On return, points to the list of files in the directory
 579                            or NULL if there are no files in the directory.
 580
 581   @retval EFI_SUCCESS           File information was returned successfully.
 582   @retval EFI_VOLUME_CORRUPTED  The file system structures have been corrupted.
 583   @retval EFI_DEVICE_ERROR      The device reported an error.
 584   @retval EFI_NO_MEDIA          The device media is not present.
 585   @retval EFI_INVALID_PARAMETER The FileDirHandle was not a directory.
 586 **/
 587 EFI_STATUS
 588 EFIAPI
 589 EfiShellFindFilesInDir (
 590   IN SHELL_FILE_HANDLE     FileDirHandle,
 591   OUT EFI_SHELL_FILE_INFO  **FileList
 592   );
 593
 594 /**
 595   Find files that match a specified pattern.
 596
 597   This function searches for all files and directories that match the specified
 598   FilePattern. The FilePattern can contain wild-card characters. The resulting file
 599   information is placed in the file list FileList.
 600
 601   Wildcards are processed
 602   according to the rules specified in UEFI Shell 2.0 spec section 3.7.1.
 603
 604   The files in the file list are not opened. The OpenMode field is set to 0 and the FileInfo
 605   field is set to NULL.
 606
 607   if *FileList is not NULL then it must be a pre-existing and properly initialized list.
 608
 609   @param FilePattern      Points to a NULL-terminated shell file path, including wildcards.
 610   @param FileList         On return, points to the start of a file list containing the names
 611                           of all matching files or else points to NULL if no matching files
 612                           were found.  only on a EFI_SUCCESS return will; this be non-NULL.
 613
 614   @retval EFI_SUCCESS           Files found.  FileList is a valid list.
 615   @retval EFI_NOT_FOUND         No files found.
 616   @retval EFI_NO_MEDIA          The device has no media
 617   @retval EFI_DEVICE_ERROR      The device reported an error
 618   @retval EFI_VOLUME_CORRUPTED  The file system structures are corrupted
 619 **/
 620 EFI_STATUS
 621 EFIAPI
 622 EfiShellFindFiles (
 623   IN CONST CHAR16          *FilePattern,
 624   OUT EFI_SHELL_FILE_INFO  **FileList
 625   );
 626
 627 /**
 628   Opens the files that match the path specified.
 629
 630   This function opens all of the files specified by Path. Wildcards are processed
 631   according to the rules specified in UEFI Shell 2.0 spec section 3.7.1. Each
 632   matching file has an EFI_SHELL_FILE_INFO structure created in a linked list.
 633
 634   @param Path                   A pointer to the path string.
 635   @param OpenMode               Specifies the mode used to open each file, EFI_FILE_MODE_READ or
 636                                 EFI_FILE_MODE_WRITE.
 637   @param FileList               Points to the start of a list of files opened.
 638
 639   @retval EFI_SUCCESS           Create the file list successfully.
 640   @return Others                Can't create the file list.
 641 **/
 642 EFI_STATUS
 643 EFIAPI
 644 EfiShellOpenFileList (
 645   IN CHAR16                   *Path,
 646   IN UINT64                   OpenMode,
 647   IN OUT EFI_SHELL_FILE_INFO  **FileList
 648   );
 649
 650 /**
 651   Gets the environment variable.
 652
 653   This function returns the current value of the specified environment variable.
 654
 655   @param Name                   A pointer to the environment variable name
 656
 657   @retval !=NULL                The environment variable's value. The returned
 658                                 pointer does not need to be freed by the caller.
 659   @retval NULL                  The environment variable doesn't exist.
 660 **/
 661 CONST CHAR16 *
 662 EFIAPI
 663 EfiShellGetEnv (
 664   IN CONST CHAR16  *Name
 665   );
 666
 667 /**
 668   Sets the environment variable.
 669
 670   This function changes the current value of the specified environment variable. If the
 671   environment variable exists and the Value is an empty string, then the environment
 672   variable is deleted. If the environment variable exists and the Value is not an empty
 673   string, then the value of the environment variable is changed. If the environment
 674   variable does not exist and the Value is an empty string, there is no action. If the
 675   environment variable does not exist and the Value is a non-empty string, then the
 676   environment variable is created and assigned the specified value.
 677
 678   For a description of volatile and non-volatile environment variables, see UEFI Shell
 679   2.0 specification section 3.6.1.
 680
 681   @param Name                   Points to the NULL-terminated environment variable name.
 682   @param Value                  Points to the NULL-terminated environment variable value. If the value is an
 683                                 empty string then the environment variable is deleted.
 684   @param Volatile               Indicates whether the variable is non-volatile (FALSE) or volatile (TRUE).
 685
 686   @retval EFI_SUCCESS           The environment variable was successfully updated.
 687 **/
 688 EFI_STATUS
 689 EFIAPI
 690 EfiShellSetEnv (
 691   IN CONST CHAR16  *Name,
 692   IN CONST CHAR16  *Value,
 693   IN BOOLEAN       Volatile
 694   );
 695
 696 /**
 697   Returns the current directory on the specified device.
 698
 699   If FileSystemMapping is NULL, it returns the current working directory. If the
 700   FileSystemMapping is not NULL, it returns the current directory associated with the
 701   FileSystemMapping. In both cases, the returned name includes the file system
 702   mapping (i.e. fs0:\current-dir).
 703
 704   @param FileSystemMapping      A pointer to the file system mapping. If NULL,
 705                                 then the current working directory is returned.
 706
 707   @retval !=NULL                The current directory.
 708   @retval NULL                  Current directory does not exist.
 709 **/
 710 CONST CHAR16 *
 711 EFIAPI
 712 EfiShellGetCurDir (
 713   IN CONST CHAR16  *FileSystemMapping OPTIONAL
 714   );
 715
 716 /**
 717   Changes the current directory on the specified device.
 718
 719   If the FileSystem is NULL, and the directory Dir does not contain a file system's
 720   mapped name, this function changes the current working directory. If FileSystem is
 721   NULL and the directory Dir contains a mapped name, then the current file system and
 722   the current directory on that file system are changed.
 723
 724   If FileSystem is not NULL, and Dir is NULL, then this changes the current working file
 725   system.
 726
 727   If FileSystem is not NULL and Dir is not NULL, then this function changes the current
 728   directory on the specified file system.
 729
 730   If the current working directory or the current working file system is changed then the
 731   %cwd% environment variable will be updated
 732
 733   @param FileSystem             A pointer to the file system's mapped name. If NULL, then the current working
 734                                 directory is changed.
 735   @param Dir                    Points to the NULL-terminated directory on the device specified by FileSystem.
 736
 737   @retval EFI_SUCCESS           The operation was successful
 738 **/
 739 EFI_STATUS
 740 EFIAPI
 741 EfiShellSetCurDir (
 742   IN CONST CHAR16  *FileSystem OPTIONAL,
 743   IN CONST CHAR16  *Dir
 744   );
 745
 746 /**
 747   Return help information about a specific command.
 748
 749   This function returns the help information for the specified command. The help text
 750   can be internal to the shell or can be from a UEFI Shell manual page.
 751
 752   If Sections is specified, then each section name listed will be compared in a casesensitive
 753   manner, to the section names described in Appendix B. If the section exists,
 754   it will be appended to the returned help text. If the section does not exist, no
 755   information will be returned. If Sections is NULL, then all help text information
 756   available will be returned.
 757
 758   @param Command                Points to the NULL-terminated UEFI Shell command name.
 759   @param Sections               Points to the NULL-terminated comma-delimited
 760                                 section names to return. If NULL, then all
 761                                 sections will be returned.
 762   @param HelpText               On return, points to a callee-allocated buffer
 763                                 containing all specified help text.
 764
 765   @retval EFI_SUCCESS           The help text was returned.
 766   @retval EFI_OUT_OF_RESOURCES  The necessary buffer could not be allocated to hold the
 767                                 returned help text.
 768   @retval EFI_INVALID_PARAMETER HelpText is NULL
 769   @retval EFI_NOT_FOUND         There is no help text available for Command.
 770 **/
 771 EFI_STATUS
 772 EFIAPI
 773 EfiShellGetHelpText (
 774   IN CONST CHAR16  *Command,
 775   IN CONST CHAR16  *Sections OPTIONAL,
 776   OUT CHAR16       **HelpText
 777   );
 778
 779 /**
 780   Gets the enable status of the page break output mode.
 781
 782   User can use this function to determine current page break mode.
 783
 784   @retval TRUE                  The page break output mode is enabled
 785   @retval FALSE                 The page break output mode is disabled
 786 **/
 787 BOOLEAN
 788 EFIAPI
 789 EfiShellGetPageBreak (
 790   VOID
 791   );
 792
 793 /**
 794   Judges whether the active shell is the root shell.
 795
 796   This function makes the user to know that whether the active Shell is the root shell.
 797
 798   @retval TRUE                  The active Shell is the root Shell.
 799   @retval FALSE                 The active Shell is NOT the root Shell.
 800 **/
 801 BOOLEAN
 802 EFIAPI
 803 EfiShellIsRootShell (
 804   VOID
 805   );
 806
 807 /**
 808   This function returns the command associated with a alias or a list of all
 809   alias'.
 810
 811   @param[in] Command            Points to the NULL-terminated shell alias.
 812                                 If this parameter is NULL, then all
 813                                 aliases will be returned in ReturnedData.
 814   @param[out] Volatile          upon return of a single command if TRUE indicates
 815                                 this is stored in a volatile fashion.  FALSE otherwise.
 816   @return                        If Alias is not NULL, it will return a pointer to
 817                                 the NULL-terminated command for that alias.
 818                                 If Alias is NULL, ReturnedData points to a ';'
 819                                 delimited list of alias (e.g.
 820                                 ReturnedData = "dir;del;copy;mfp") that is NULL-terminated.
 821   @retval NULL                  an error occurred
 822   @retval NULL                  Alias was not a valid Alias
 823 **/
 824 CONST CHAR16 *
 825 EFIAPI
 826 EfiShellGetAlias (
 827   IN  CONST CHAR16  *Command,
 828   OUT BOOLEAN       *Volatile OPTIONAL
 829   );
 830
 831 /**
 832   Changes a shell command alias.
 833
 834   This function creates an alias for a shell command or if Alias is NULL it will delete an existing alias.
 835
 836   this function does not check for built in alias'.
 837
 838   @param[in] Command            Points to the NULL-terminated shell command or existing alias.
 839   @param[in] Alias              Points to the NULL-terminated alias for the shell command. If this is NULL, and
 840                                 Command refers to an alias, that alias will be deleted.
 841   @param[in] Volatile           if TRUE the Alias being set will be stored in a volatile fashion.  if FALSE the
 842                                 Alias being set will be stored in a non-volatile fashion.
 843
 844   @retval EFI_SUCCESS           Alias created or deleted successfully.
 845   @retval EFI_NOT_FOUND         the Alias intended to be deleted was not found
 846 **/
 847 EFI_STATUS
 848 InternalSetAlias (
 849   IN CONST CHAR16  *Command,
 850   IN CONST CHAR16  *Alias OPTIONAL,
 851   IN BOOLEAN       Volatile
 852   );
 853
 854 /**
 855   Changes a shell command alias.
 856
 857   This function creates an alias for a shell command or if Alias is NULL it will delete an existing alias.
 858
 859
 860   @param[in] Command            Points to the NULL-terminated shell command or existing alias.
 861   @param[in] Alias              Points to the NULL-terminated alias for the shell command. If this is NULL, and
 862                                 Command refers to an alias, that alias will be deleted.
 863   @param[in] Replace            If TRUE and the alias already exists, then the existing alias will be replaced. If
 864                                 FALSE and the alias already exists, then the existing alias is unchanged and
 865                                 EFI_ACCESS_DENIED is returned.
 866   @param[in] Volatile           if TRUE the Alias being set will be stored in a volatile fashion.  if FALSE the
 867                                 Alias being set will be stored in a non-volatile fashion.
 868
 869   @retval EFI_SUCCESS           Alias created or deleted successfully.
 870   @retval EFI_NOT_FOUND         the Alias intended to be deleted was not found
 871   @retval EFI_ACCESS_DENIED     The alias is a built-in alias or already existed and Replace was set to
 872                                 FALSE.
 873 **/
 874 EFI_STATUS
 875 EFIAPI
 876 EfiShellSetAlias (
 877   IN CONST CHAR16  *Command,
 878   IN CONST CHAR16  *Alias OPTIONAL,
 879   IN BOOLEAN       Replace,
 880   IN BOOLEAN       Volatile
 881   );
 882
 883 /**
 884   Utility cleanup function for EFI_SHELL_FILE_INFO objects.
 885
 886   1) frees all pointers (non-NULL)
 887   2) Closes the SHELL_FILE_HANDLE
 888
 889   @param FileListNode     pointer to the list node to free
 890 **/
 891 VOID
 892 InternalFreeShellFileInfoNode (
 893   IN EFI_SHELL_FILE_INFO  *FileListNode
 894   );
 895
 896 /**
 897   Internal variable setting function.  Allows for setting of the read only variables.
 898
 899   @param Name                   Points to the NULL-terminated environment variable name.
 900   @param Value                  Points to the NULL-terminated environment variable value. If the value is an
 901                                 empty string then the environment variable is deleted.
 902   @param Volatile               Indicates whether the variable is non-volatile (FALSE) or volatile (TRUE).
 903
 904   @retval EFI_SUCCESS           The environment variable was successfully updated.
 905 **/
 906 EFI_STATUS
 907 InternalEfiShellSetEnv (
 908   IN CONST CHAR16  *Name,
 909   IN CONST CHAR16  *Value,
 910   IN BOOLEAN       Volatile
 911   );
 912
 913 /**
 914   Function to start monitoring for CTRL-C using SimpleTextInputEx.  This
 915   feature's enabled state was not known when the shell initially launched.
 916
 917   @retval EFI_SUCCESS           The feature is enabled.
 918   @retval EFI_OUT_OF_RESOURCES  There is not enough memory available.
 919 **/
 920 EFI_STATUS
 921 InernalEfiShellStartMonitor (
 922   VOID
 923   );
 924
 925 /**
 926   Notification function for keystrokes.
 927
 928   @param[in] KeyData    The key that was pressed.
 929
 930   @retval EFI_SUCCESS   The operation was successful.
 931 **/
 932 EFI_STATUS
 933 EFIAPI
 934 NotificationFunction (
 935   IN EFI_KEY_DATA  *KeyData
 936   );
 937
 938 #endif //_SHELL_PROTOCOL_HEADER_