ShellPkg/Include/Library/ShellCommandLib.h

   1 /** @file
   2   Provides interface to shell internal functions for shell commands.
   3
   4   This library is for use ONLY by shell commands linked into the shell application.
   5   This library will not funciton if it is used for UEFI Shell 2.0 Applications.
   6
   7   Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
   8   This program and the accompanying materials
   9   are licensed and made available under the terms and conditions of the BSD License
  10   which accompanies this distribution.  The full text of the license may be found at
  11   http://opensource.org/licenses/bsd-license.php.
  12
  13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  14   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  15
  16 **/
  17
  18 #ifndef _SHELL_COMMAND_LIB_
  19 #define _SHELL_COMMAND_LIB_
  20
  21 #include <Uefi.h>
  22 #include <ShellBase.h>
  23
  24 #include <Protocol/EfiShell.h>
  25 #include <Protocol/EfiShellParameters.h>
  26 #include <Protocol/UnicodeCollation.h>
  27 #include <Protocol/DevicePathToText.h>
  28 #include <Protocol/SimpleFileSystem.h>
  29
  30 #include <Library/UefiBootServicesTableLib.h>
  31
  32 //
  33 // The extern global protocol poionters.
  34 //
  35 extern        EFI_SHELL_PROTOCOL                *gEfiShellProtocol;
  36 extern        EFI_SHELL_PARAMETERS_PROTOCOL     *gEfiShellParametersProtocol;
  37 extern        EFI_UNICODE_COLLATION_PROTOCOL    *gUnicodeCollation;
  38 extern        EFI_DEVICE_PATH_TO_TEXT_PROTOCOL  *gDevPathToText;
  39 extern        CONST CHAR16*                     SupportLevel[];
  40
  41 //
  42 // The map list objects.
  43 //
  44 typedef struct {
  45   LIST_ENTRY                    Link;
  46   EFI_DEVICE_PATH_PROTOCOL      *DevicePath;
  47   CHAR16                        *MapName;
  48   CHAR16                        *CurrentDirectoryPath;
  49   UINT64                         Flags;
  50 } SHELL_MAP_LIST;
  51 /// List of Mappings - DeviceName and Drive Letter(ism).
  52 extern        SHELL_MAP_LIST                      gShellMapList;
  53 /// Pointer to node of current directory in the mMapList.
  54 extern        SHELL_MAP_LIST                      *gShellCurDir;
  55
  56 /**
  57   Returns the help MAN fileName for a given shell command.
  58
  59   @retval !NULL   The unicode string of the MAN filename.
  60   @retval NULL    An error ocurred.
  61
  62 **/
  63 typedef
  64 CONST CHAR16 *
  65 (EFIAPI *SHELL_GET_MAN_FILENAME)(
  66   VOID
  67   );
  68
  69 /**
  70   Runs a shell command on a given command line.
  71
  72   The specific operation of a given shell command is specified in the UEFI Shell
  73   Specification 2.0, or in the source of the given command.
  74
  75   Upon completion of the command run the shell protocol and environment variables
  76   may have been updated due to the operation.
  77
  78   @param[in] ImageHandle              The ImageHandle to the app, or NULL if
  79                                       the command built into shell.
  80   @param[in] SystemTable              The pointer to the system table.
  81
  82   @retval  RETURN_SUCCESS             The shell command was sucessful.
  83   @retval  RETURN_UNSUPPORTED         The command is not supported.
  84 **/
  85 typedef
  86 SHELL_STATUS
  87 (EFIAPI *SHELL_RUN_COMMAND)(
  88   IN EFI_HANDLE        ImageHandle,
  89   IN EFI_SYSTEM_TABLE  *SystemTable
  90   );
  91
  92 /**
  93   Registers the handlers of type SHELL_RUN_COMMAND and
  94   SHELL_GET_MAN_FILENAME for each shell command.
  95
  96   If the ShellSupportLevel is greater than the value of
  97   PcdShellSupportLevel, then return RETURN_UNSUPPORTED.
  98
  99   Registers the the handlers specified by GetHelpInfoHandler and CommandHandler
 100   with the command specified by CommandString. If the command named by
 101   CommandString has already been registered, then return
 102   RETURN_ALREADY_STARTED.
 103
 104   If there are not enough resources available to register the handlers, then
 105   RETURN_OUT_OF_RESOURCES is returned.
 106
 107   If CommandString is NULL, then ASSERT().
 108   If GetHelpInfoHandler is NULL, then ASSERT().
 109   If CommandHandler is NULL, then ASSERT().
 110   If ProfileName is NULL, then ASSERT().
 111
 112   @param[in]  CommandString         The pointer to the command name.  This is the
 113                                     name to look for on the command line in
 114                                     the shell.
 115   @param[in]  CommandHandler        The pointer to a function that runs the
 116                                     specified command.
 117   @param[in]  GetManFileName        The pointer to a function that provides man
 118                                     filename.
 119   @param[in]  ShellMinSupportLevel  The minimum Shell Support Level which has this
 120                                     function.
 121   @param[in]  ProfileName           The profile name to require for support of this
 122                                     function.
 123   @param[in]  CanAffectLE           Indicates whether this command's return value
 124                                     can change the LASTERROR environment variable.
 125   @param[in]  HiiHandle             The handle of this command's HII entry.
 126   @param[in]  ManFormatHelp         The HII locator for the help text.
 127
 128   @retval  RETURN_SUCCESS           The handlers were registered.
 129   @retval  RETURN_OUT_OF_RESOURCES  There are not enough resources available to
 130                                     register the shell command.
 131   @retval RETURN_UNSUPPORTED        The ShellMinSupportLevel was higher than the
 132                                     currently allowed support level.
 133   @retval RETURN_ALREADY_STARTED    The CommandString represents a command that
 134                                     is already registered.  Only one handler set for
 135                                     a given command is allowed.
 136   @sa SHELL_GET_MAN_FILENAME
 137   @sa SHELL_RUN_COMMAND
 138 **/
 139 RETURN_STATUS
 140 EFIAPI
 141 ShellCommandRegisterCommandName (
 142   IN CONST  CHAR16                      *CommandString,
 143   IN        SHELL_RUN_COMMAND           CommandHandler,
 144   IN        SHELL_GET_MAN_FILENAME      GetManFileName,
 145   IN        UINT32                      ShellMinSupportLevel,
 146   IN CONST  CHAR16                      *ProfileName,
 147   IN CONST  BOOLEAN                     CanAffectLE,
 148   IN CONST  EFI_HANDLE                  HiiHandle,
 149   IN CONST  EFI_STRING_ID               ManFormatHelp
 150   );
 151
 152 /**
 153   Checks if a command string has been registered for CommandString, and if so, it runs
 154   the previously registered handler for that command with the command line.
 155
 156   If CommandString is NULL, then ASSERT().
 157
 158   If Sections is specified, then each section name listed will be compared in a case sensitive
 159   manner to the section names described in Appendix B UEFI Shell 2.0 Specification. If the section exists,
 160   it is appended to the returned help text. If the section does not exist, no
 161   information is returned. If Sections is NULL, then all help text information
 162   available is returned.
 163
 164   @param[in]  CommandString         The pointer to the command name.  This is the name
 165                                     found on the command line in the shell.
 166   @param[in,out] RetVal             The pointer to the return value from the command handler.
 167
 168   @param[in,out]  CanAffectLE       Indicates whether this command's return value
 169                                     needs to be placed into LASTERROR environment variable.
 170
 171   @retval RETURN_SUCCESS            The handler was run.
 172   @retval RETURN_NOT_FOUND          The CommandString did not match a registered
 173                                     command name.
 174   @sa SHELL_RUN_COMMAND
 175 **/
 176 RETURN_STATUS
 177 EFIAPI
 178 ShellCommandRunCommandHandler (
 179   IN CONST CHAR16               *CommandString,
 180   IN OUT SHELL_STATUS           *RetVal,
 181   IN OUT BOOLEAN                *CanAffectLE OPTIONAL
 182   );
 183
 184 /**
 185   Checks if a command string has been registered for CommandString, and if so, it
 186   returns the MAN filename specified for that command.
 187
 188   If CommandString is NULL, then ASSERT().
 189
 190   @param[in]  CommandString         The pointer to the command name.  This is the name
 191                                     found on the command line in the shell.
 192
 193   @retval NULL                      The CommandString was not a registered command.
 194   @retval other                     The name of the MAN file.
 195   @sa SHELL_GET_MAN_FILENAME
 196 **/
 197 CONST CHAR16*
 198 EFIAPI
 199 ShellCommandGetManFileNameHandler (
 200   IN CONST CHAR16               *CommandString
 201   );
 202
 203
 204 typedef struct {
 205   LIST_ENTRY  Link;
 206   CHAR16      *CommandString;
 207 } COMMAND_LIST;
 208
 209 /**
 210   Get the list of all available shell internal commands.  This is a linked list,
 211   via the LIST_ENTRY structure.  Enumerate through it using the BaseLib linked
 212   list functions.  Do not modify the values.
 213
 214   @return A linked list of all available shell commands.
 215 **/
 216 CONST COMMAND_LIST*
 217 EFIAPI
 218 ShellCommandGetCommandList (
 219   VOID
 220   );
 221
 222 typedef struct {
 223   LIST_ENTRY  Link;
 224   CHAR16      *CommandString;
 225   CHAR16      *Alias;
 226 } ALIAS_LIST;
 227
 228 /**
 229   Registers aliases to be set as part of the initialization of the shell application.
 230
 231   If Command is NULL, then ASSERT().
 232   If Alias is NULL, then ASSERT().
 233
 234   @param[in]  Command               The pointer to the Command.
 235   @param[in]  Alias                 The pointer to Alias.
 236
 237   @retval  RETURN_SUCCESS           The handlers were registered.
 238   @retval  RETURN_OUT_OF_RESOURCES  There are not enough resources available to
 239                                     register the shell command.
 240 **/
 241 RETURN_STATUS
 242 EFIAPI
 243 ShellCommandRegisterAlias (
 244   IN CONST CHAR16                       *Command,
 245   IN CONST CHAR16                       *Alias
 246   );
 247
 248 /**
 249   Get the list of all shell alias commands.  This is a linked list,
 250   via LIST_ENTRY structure.  Enumerate through it using the BaseLib linked
 251   list functions.  Do not modify the values.
 252
 253   @return A linked list of all requested shell aliases.
 254 **/
 255 CONST ALIAS_LIST*
 256 EFIAPI
 257 ShellCommandGetInitAliasList (
 258   VOID
 259   );
 260
 261 /**
 262   Determine if a given alias is on the list of built in aliases.
 263
 264   @param[in] Alias              The alias to test for.
 265
 266   @retval TRUE                  The alias is a built in alias.
 267   @retval FALSE                 The alias is not a built in alias.
 268 **/
 269 BOOLEAN
 270 EFIAPI
 271 ShellCommandIsOnAliasList (
 272   IN CONST CHAR16 *Alias
 273   );
 274
 275 /**
 276   Checks if a command is already on the list.
 277
 278   @param[in] CommandString        The command string to check for on the list.
 279
 280   @retval TRUE  CommandString represents a registered command.
 281   @retval FALSE CommandString does not represent a registered command.
 282 **/
 283 BOOLEAN
 284 EFIAPI
 285 ShellCommandIsCommandOnList (
 286   IN CONST  CHAR16                      *CommandString
 287   );
 288
 289 /**
 290   Get the help text for a command.
 291
 292   @param[in] CommandString        The command name.
 293
 294   @retval NULL  No help text was found.
 295   @return       The string of the help text.  The caller required to free.
 296 **/
 297 CHAR16*
 298 EFIAPI
 299 ShellCommandGetCommandHelp (
 300   IN CONST  CHAR16                      *CommandString
 301   );
 302
 303 /**
 304   Function to make sure that the above pointers are valid.
 305 **/
 306 EFI_STATUS
 307 EFIAPI
 308 CommandInit (
 309   VOID
 310   );
 311
 312 /**
 313   Function to determine current state of ECHO.  Echo determines if lines from scripts
 314   and ECHO commands are enabled.
 315
 316   @retval TRUE    Echo is currently enabled.
 317   @retval FALSE   Echo is currently disabled.
 318 **/
 319 BOOLEAN
 320 EFIAPI
 321 ShellCommandGetEchoState (
 322   VOID
 323   );
 324
 325 /**
 326   Function to set current state of ECHO.  Echo determines if lines from scripts
 327   and ECHO commands are enabled.
 328
 329   @param[in] State    TRUE to enable Echo, FALSE otherwise.
 330 **/
 331 VOID
 332 EFIAPI
 333 ShellCommandSetEchoState (
 334   IN BOOLEAN State
 335   );
 336
 337
 338
 339 /**
 340   Indicate that the current shell or script should exit.
 341
 342   @param[in] ScriptOnly   TRUE if exiting a script; FALSE otherwise.
 343 **/
 344 VOID
 345 EFIAPI
 346 ShellCommandRegisterExit (
 347   IN BOOLEAN ScriptOnly
 348   );
 349
 350 /**
 351   Retrieve the Exit indicator.
 352
 353   @retval TRUE      Exit was indicated.
 354   @retval FALSE     Exit was not indicated.
 355 **/
 356 BOOLEAN
 357 EFIAPI
 358 ShellCommandGetExit (
 359   VOID
 360   );
 361
 362 /**
 363   Retrieve the Exit script indicator.
 364
 365   If ShellCommandGetExit returns FALSE, then the return from this is undefined.
 366
 367   @retval TRUE      ScriptOnly was indicated.
 368   @retval FALSE     ScriptOnly was not indicated.
 369 **/
 370 BOOLEAN
 371 EFIAPI
 372 ShellCommandGetScriptExit (
 373   VOID
 374   );
 375
 376 typedef struct {
 377   LIST_ENTRY      Link;     ///< List enumerator items.
 378   UINTN           Line;     ///< What line of the script file this was on.
 379   CHAR16          *Cl;      ///< The original command line.
 380   VOID            *Data;    ///< The data structure format dependant upon Command. (not always used)
 381   BOOLEAN         Reset;    ///< Reset the command (it must be treated like a initial run (but it may have data already))
 382 } SCRIPT_COMMAND_LIST;
 383
 384 typedef struct {
 385   CHAR16              *ScriptName;        ///< The filename of this script.
 386   CHAR16              **Argv;             ///< The parmameters to the script file.
 387   UINTN               Argc;               ///< The count of parameters.
 388   LIST_ENTRY          CommandList;        ///< The script converted to a list of commands (SCRIPT_COMMAND_LIST objects).
 389   SCRIPT_COMMAND_LIST *CurrentCommand;    ///< The command currently being operated.  If !=NULL must be a member of CommandList.
 390   LIST_ENTRY          SubstList;          ///< A list of current script loop alias' (ALIAS_LIST objects) (Used for the for %-based replacement).
 391 } SCRIPT_FILE;
 392
 393 /**
 394   Function to return a pointer to the currently running script file object.
 395
 396   @retval NULL        A script file is not currently running.
 397   @return             A pointer to the current script file object.
 398 **/
 399 SCRIPT_FILE*
 400 EFIAPI
 401 ShellCommandGetCurrentScriptFile (
 402   VOID
 403   );
 404
 405 /**
 406   Function to set a new script as the currently running one.
 407
 408   This function will correctly stack and unstack nested scripts.
 409
 410   @param[in] Script   The pointer to new script information structure.  If NULL,
 411                       it removes and de-allocates the topmost Script structure.
 412
 413   @return             A pointer to the current running script file after this
 414                       change.  It is NULL if removing the final script.
 415 **/
 416 SCRIPT_FILE*
 417 EFIAPI
 418 ShellCommandSetNewScript (
 419   IN SCRIPT_FILE *Script OPTIONAL
 420   );
 421
 422 /**
 423   Function to cleanup all memory from a SCRIPT_FILE structure.
 424
 425   @param[in] Script     The pointer to the structure to cleanup.
 426 **/
 427 VOID
 428 EFIAPI
 429 DeleteScriptFileStruct (
 430   IN SCRIPT_FILE *Script
 431   );
 432
 433 /**
 434   Function to get the current Profile string.
 435
 436   This is used to retrieve what profiles were installed.
 437
 438   @retval NULL  There are no installed profiles.
 439   @return       A semicolon-delimited list of profiles.
 440 **/
 441 CONST CHAR16 *
 442 EFIAPI
 443 ShellCommandGetProfileList (
 444   VOID
 445   );
 446
 447 typedef enum {
 448   MappingTypeFileSystem,
 449   MappingTypeBlockIo,
 450   MappingTypeMax
 451 } SHELL_MAPPING_TYPE;
 452
 453 /**
 454   Function to generate the next default mapping name.
 455
 456   If the return value is not NULL then it must be callee freed.
 457
 458   @param Type                   What kind of mapping name to make.
 459
 460   @retval NULL                  a memory allocation failed.
 461   @return a new map name string
 462 **/
 463 CHAR16*
 464 EFIAPI
 465 ShellCommandCreateNewMappingName(
 466   IN CONST SHELL_MAPPING_TYPE Type
 467   );
 468
 469 /**
 470   Function to initialize the table for creating consistent map names.
 471
 472   @param[out] Table             The pointer to pointer to pointer to DevicePathProtocol object.
 473
 474   @retval EFI_SUCCESS           The table was created successfully.
 475 **/
 476 EFI_STATUS
 477 EFIAPI
 478 ShellCommandConsistMappingInitialize (
 479   EFI_DEVICE_PATH_PROTOCOL           ***Table
 480   );
 481
 482 /**
 483   Function to uninitialize the table for creating consistent map names.
 484
 485   The parameter must have been received from ShellCommandConsistMappingInitialize.
 486
 487   @param[out] Table             The pointer to pointer to DevicePathProtocol object.
 488
 489   @retval EFI_SUCCESS           The table was deleted successfully.
 490 **/
 491 EFI_STATUS
 492 EFIAPI
 493 ShellCommandConsistMappingUnInitialize (
 494   EFI_DEVICE_PATH_PROTOCOL      **Table
 495   );
 496
 497 /**
 498   Create a consistent mapped name for the device specified by DevicePath
 499   based on the Table.
 500
 501   This must be called after ShellCommandConsistMappingInitialize() and
 502   before ShellCommandConsistMappingUnInitialize() is called.
 503
 504   @param[in] DeviecPath   The pointer to the dev path for the device.
 505   @param[in] Table        The Table of mapping information.
 506
 507   @retval NULL            A consistent mapped name could not be created.
 508   @return                 A pointer to a string allocated from pool with the device name.
 509 **/
 510 CHAR16*
 511 EFIAPI
 512 ShellCommandConsistMappingGenMappingName (
 513   IN EFI_DEVICE_PATH_PROTOCOL      *DevicePath,
 514   IN EFI_DEVICE_PATH_PROTOCOL      **Table
 515   );
 516
 517 /**
 518   Function to search the list of mappings for the first matching node on the
 519   list based on the MapKey.
 520
 521   @param[in] MapKey             The pointer to the string key to search for in the map.
 522
 523   @return the node on the list.
 524 **/
 525 SHELL_MAP_LIST*
 526 EFIAPI
 527 ShellCommandFindMapItem (
 528   IN CONST CHAR16               *MapKey
 529   );
 530
 531 /**
 532   Function to add a map node to the list of map items and update the "path" environment variable (optionally).
 533
 534   If Path is TRUE (during initialization only), the path environment variable will also be updated to include
 535   default paths on the new map name...
 536
 537   Path should be FALSE when this function is called from the protocol SetMap function.
 538
 539   @param[in] Name               The human readable mapped name.
 540   @param[in] DevicePath         The Device Path for this map.
 541   @param[in] Flags              The Flags attribute for this map item.
 542   @param[in] Path               TRUE to update path, FALSE to skip this step (should only be TRUE during initialization).
 543
 544   @retval EFI_SUCCESS           The addition was sucessful.
 545   @retval EFI_OUT_OF_RESOURCES  A memory allocation failed.
 546   @retval EFI_INVALID_PARAMETER A parameter was invalid.
 547 **/
 548 EFI_STATUS
 549 EFIAPI
 550 ShellCommandAddMapItemAndUpdatePath(
 551   IN CONST CHAR16                   *Name,
 552   IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
 553   IN CONST UINT64                   Flags,
 554   IN CONST BOOLEAN                  Path
 555   );
 556
 557 /**
 558   Creates the default map names for each device path in the system with
 559   a protocol depending on the Type.
 560
 561   Also sets up the default path environment variable if Type is FileSystem.
 562
 563   @retval EFI_SUCCESS           All map names were created sucessfully.
 564   @retval EFI_NOT_FOUND         No protocols were found in the system.
 565   @return                       Error returned from gBS->LocateHandle().
 566
 567   @sa LocateHandle
 568 **/
 569 EFI_STATUS
 570 EFIAPI
 571 ShellCommandCreateInitialMappingsAndPaths(
 572   VOID
 573   );
 574
 575 /**
 576   Function to standardize the directory indicators to \ characters.
 577
 578   @param[in,out] Path   The pointer to the path string to fix.
 579
 580   @retval NULL          The operation failed.
 581   @return               The Path pointer.
 582 **/
 583 CHAR16*
 584 EFIAPI
 585 ShellCommandCleanPath (
 586   IN OUT CHAR16 *Path
 587   );
 588
 589 /**
 590   Converts a SHELL_FILE_HANDLE to an EFI_FILE_PROTOCOL*.
 591
 592   @param[in] Handle     The SHELL_FILE_HANDLE to convert.
 593
 594   @return a EFI_FILE_PROTOCOL* representing the same file.
 595 **/
 596 EFI_FILE_PROTOCOL*
 597 EFIAPI
 598 ConvertShellHandleToEfiFileProtocol(
 599   IN CONST SHELL_FILE_HANDLE Handle
 600   );
 601
 602 /**
 603   Remove a SHELL_FILE_HANDLE frmo the list of SHELL_FILE_HANDLES.
 604
 605   @param[in] Handle     The SHELL_FILE_HANDLE to remove.
 606
 607   @retval TRUE          The item was removed.
 608   @retval FALSE         The item was not found.
 609 **/
 610 BOOLEAN
 611 EFIAPI
 612 ShellFileHandleRemove(
 613   IN CONST SHELL_FILE_HANDLE Handle
 614   );
 615
 616 /**
 617   Converts a EFI_FILE_PROTOCOL* to an SHELL_FILE_HANDLE.
 618
 619   @param[in] Handle     The pointer to EFI_FILE_PROTOCOL to convert.
 620   @param[in] Path       The path to the file for verification.
 621
 622   @return a SHELL_FILE_HANDLE representing the same file.
 623 **/
 624 SHELL_FILE_HANDLE
 625 EFIAPI
 626 ConvertEfiFileProtocolToShellHandle(
 627   IN CONST EFI_FILE_PROTOCOL *Handle,
 628   IN CONST CHAR16            *Path
 629   );
 630
 631 /**
 632   Find the path that was logged with the specified SHELL_FILE_HANDLE.
 633
 634   @param[in] Handle     The SHELL_FILE_HANDLE to query on.
 635
 636   @return A pointer to the path for the file.
 637 **/
 638 CONST CHAR16*
 639 EFIAPI
 640 ShellFileHandleGetPath(
 641   IN CONST SHELL_FILE_HANDLE Handle
 642   );
 643
 644
 645 /**
 646   Function to determine if a SHELL_FILE_HANDLE is at the end of the file.
 647
 648   This will NOT work on directories.
 649
 650   If Handle is NULL, then ASSERT.
 651
 652   @param[in] Handle     the file handle
 653
 654   @retval TRUE          the position is at the end of the file
 655   @retval FALSE         the position is not at the end of the file
 656 **/
 657 BOOLEAN
 658 EFIAPI
 659 ShellFileHandleEof(
 660   IN SHELL_FILE_HANDLE Handle
 661   );
 662
 663 /**
 664   Function to read a single line from a SHELL_FILE_HANDLE. The \n is not included in the returned
 665   buffer.  The returned buffer must be callee freed.
 666
 667   If the position upon start is 0, then the Ascii Boolean will be set.  This should be
 668   maintained and not changed for all operations with the same file.
 669
 670   @param[in]      Handle        SHELL_FILE_HANDLE to read from.
 671   @param[in,out]  Ascii         Boolean value for indicating whether the file is
 672                                 Ascii (TRUE) or UCS2 (FALSE).
 673
 674   @return                       The line of text from the file.
 675
 676   @sa ShellFileHandleReadLine
 677 **/
 678 CHAR16*
 679 EFIAPI
 680 ShellFileHandleReturnLine(
 681   IN SHELL_FILE_HANDLE            Handle,
 682   IN OUT BOOLEAN                *Ascii
 683   );
 684
 685 /**
 686   Function to read a single line (up to but not including the \n) from a SHELL_FILE_HANDLE.
 687
 688   If the position upon start is 0, then the Ascii Boolean will be set.  This should be
 689   maintained and not changed for all operations with the same file.
 690
 691   @param[in]      Handle        SHELL_FILE_HANDLE to read from.
 692   @param[in,out]  Buffer        The pointer to buffer to read into.
 693   @param[in,out]  Size          The pointer to number of bytes in Buffer.
 694   @param[in]      Truncate      If the buffer is large enough, this has no effect.
 695                                 If the buffer is is too small and Truncate is TRUE,
 696                                 the line will be truncated.
 697                                 If the buffer is is too small and Truncate is FALSE,
 698                                 then no read will occur.
 699
 700   @param[in,out]  Ascii         Boolean value for indicating whether the file is
 701                                 Ascii (TRUE) or UCS2 (FALSE).
 702
 703   @retval EFI_SUCCESS           The operation was successful.  The line is stored in
 704                                 Buffer.
 705   @retval EFI_INVALID_PARAMETER Handle was NULL.
 706   @retval EFI_INVALID_PARAMETER Size was NULL.
 707   @retval EFI_BUFFER_TOO_SMALL  Size was not large enough to store the line.
 708                                 Size was updated to the minimum space required.
 709   @sa ShellFileHandleRead
 710 **/
 711 EFI_STATUS
 712 EFIAPI
 713 ShellFileHandleReadLine(
 714   IN SHELL_FILE_HANDLE          Handle,
 715   IN OUT CHAR16                 *Buffer,
 716   IN OUT UINTN                  *Size,
 717   IN BOOLEAN                    Truncate,
 718   IN OUT BOOLEAN                *Ascii
 719   );
 720
 721 typedef struct {
 722   LIST_ENTRY    Link;
 723   void          *Buffer;
 724 } BUFFER_LIST;
 725
 726 /**
 727   Frees any BUFFER_LIST defined type.
 728
 729   @param[in] List   The pointer to the list head.
 730 **/
 731 VOID
 732 EFIAPI
 733 FreeBufferList (
 734   IN BUFFER_LIST *List
 735   );
 736
 737 /**
 738   Chops off last directory or file entry in a path by changing the last '\' to a CHAR_NULL
 739
 740   @param[in,out] PathToReturn   The pointer to the path to modify.
 741
 742   @retval FALSE     No directory was found to chop off.
 743   @retval TRUE      A directory was chopped off.
 744 **/
 745 BOOLEAN
 746 EFIAPI
 747 ChopLastSlash(
 748   IN OUT CHAR16 *PathToReturn
 749   );
 750
 751 /**
 752   Function to clean up paths.  Removes the following items:
 753     single periods in the path (no need for the current directory tag)
 754     double periods in the path and removes a single parent directory.
 755
 756   This will be done inline and the resultant string may be be 'too big'.
 757
 758   @param[in] PathToReturn  The pointer to the string containing the path.
 759
 760   @return PathToReturn is always returned.
 761 **/
 762 CHAR16*
 763 EFIAPI
 764 CleanPath(
 765   IN CHAR16 *PathToReturn
 766   );
 767
 768 #endif //_SHELL_COMMAND_LIB_