ShellPkg/Library/UefiShellLevel1CommandsLib/For.c

   1 /** @file
   2   Main file for endfor and for shell level 1 functions.
   3
   4   Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "UefiShellLevel1CommandsLib.h"
  16 #include <Library/PrintLib.h>
  17
  18 /**
  19   Determine if a valid string is a valid number for the 'for' command.
  20
  21   @param[in] Number The pointer to the string representation of the number to test.
  22
  23   @retval TRUE    The number is valid.
  24   @retval FALSE   The number is not valid.
  25 **/
  26 BOOLEAN
  27 EFIAPI
  28 ShellIsValidForNumber (
  29   IN CONST CHAR16 *Number
  30   )
  31 {
  32   if (Number == NULL || *Number == CHAR_NULL) {
  33     return (FALSE);
  34   }
  35
  36   if (*Number == L'-') {
  37     Number++;
  38   }
  39
  40   if (StrLen(Number) == 0) {
  41     return (FALSE);
  42   }
  43
  44   if (StrLen(Number) >= 7) {
  45     if ((StrStr(Number, L" ") == NULL) || (((StrStr(Number, L" ") != NULL) && (StrStr(Number, L" ") - Number) >= 7))) {
  46       return (FALSE);
  47     }
  48   }
  49
  50   if (!ShellIsDecimalDigitCharacter(*Number)) {
  51     return (FALSE);
  52   }
  53
  54   return (TRUE);
  55 }
  56
  57 /**
  58   Function for 'endfor' command.
  59
  60   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  61   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
  62 **/
  63 SHELL_STATUS
  64 EFIAPI
  65 ShellCommandRunEndFor (
  66   IN EFI_HANDLE        ImageHandle,
  67   IN EFI_SYSTEM_TABLE  *SystemTable
  68   )
  69 {
  70   EFI_STATUS          Status;
  71   BOOLEAN             Found;
  72   SCRIPT_FILE         *CurrentScriptFile;
  73
  74   Status = CommandInit();
  75   ASSERT_EFI_ERROR(Status);
  76
  77   if (!gEfiShellProtocol->BatchIsActive()) {
  78     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_NO_SCRIPT), gShellLevel1HiiHandle, L"EndFor");
  79     return (SHELL_UNSUPPORTED);
  80   }
  81
  82   if (gEfiShellParametersProtocol->Argc > 1) {
  83     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellLevel1HiiHandle);
  84     return (SHELL_INVALID_PARAMETER);
  85   }
  86
  87   Found = MoveToTag(GetPreviousNode, L"for", L"endfor", NULL, ShellCommandGetCurrentScriptFile(), FALSE, FALSE, FALSE);
  88
  89   if (!Found) {
  90     CurrentScriptFile = ShellCommandGetCurrentScriptFile();
  91     ShellPrintHiiEx(
  92       -1,
  93       -1,
  94       NULL,
  95       STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
  96       gShellLevel1HiiHandle,
  97       L"For",
  98       L"EndFor",
  99       CurrentScriptFile!=NULL
 100         && CurrentScriptFile->CurrentCommand!=NULL
 101           ? CurrentScriptFile->CurrentCommand->Line:0);
 102     return (SHELL_NOT_FOUND);
 103   }
 104   return (SHELL_SUCCESS);
 105 }
 106
 107 typedef struct {
 108   UINT32          Signature;
 109   INTN            Current;
 110   INTN            End;
 111   INTN            Step;
 112   CHAR16          *ReplacementName;
 113   CHAR16          *CurrentValue;
 114   BOOLEAN         RemoveSubstAlias;
 115   CHAR16          Set[1];
 116   } SHELL_FOR_INFO;
 117 #define SIZE_OF_SHELL_FOR_INFO OFFSET_OF (SHELL_FOR_INFO, Set)
 118 #define SHELL_FOR_INFO_SIGNATURE SIGNATURE_32 ('S', 'F', 'I', 's')
 119
 120 /**
 121   Update the value of a given alias on the list.  If the alias is not there then add it.
 122
 123   @param[in] Alias               The alias to test for.
 124   @param[in] CommandString       The updated command string.
 125   @param[in, out] List           The list to search.
 126
 127   @retval EFI_SUCCESS           The operation was completed successfully.
 128   @retval EFI_OUT_OF_RESOURCES  There was not enough free memory.
 129 **/
 130 EFI_STATUS
 131 EFIAPI
 132 InternalUpdateAliasOnList(
 133   IN CONST CHAR16       *Alias,
 134   IN CONST CHAR16       *CommandString,
 135   IN OUT LIST_ENTRY     *List
 136   )
 137 {
 138   ALIAS_LIST *Node;
 139   BOOLEAN    Found;
 140
 141   //
 142   // assert for NULL parameter
 143   //
 144   ASSERT(Alias != NULL);
 145
 146   //
 147   // check for the Alias
 148   //
 149   for ( Node = (ALIAS_LIST *)GetFirstNode(List), Found = FALSE
 150       ; !IsNull(List, &Node->Link)
 151       ; Node = (ALIAS_LIST *)GetNextNode(List, &Node->Link)
 152      ){
 153     ASSERT(Node->CommandString != NULL);
 154     ASSERT(Node->Alias != NULL);
 155     if (StrCmp(Node->Alias, Alias)==0) {
 156       FreePool(Node->CommandString);
 157       Node->CommandString = NULL;
 158       Node->CommandString = StrnCatGrow(&Node->CommandString, NULL, CommandString, 0);
 159       Found = TRUE;
 160       break;
 161     }
 162   }
 163   if (!Found) {
 164     Node = AllocateZeroPool(sizeof(ALIAS_LIST));
 165     if (Node == NULL) {
 166       return (EFI_OUT_OF_RESOURCES);
 167     }
 168     ASSERT(Node->Alias == NULL);
 169     Node->Alias         = StrnCatGrow(&Node->Alias, NULL, Alias, 0);
 170     ASSERT(Node->CommandString == NULL);
 171     Node->CommandString = StrnCatGrow(&Node->CommandString, NULL, CommandString, 0);
 172     InsertTailList(List, &Node->Link);
 173   }
 174   return (EFI_SUCCESS);
 175 }
 176
 177 /**
 178   Find out if an alias is on the given list.
 179
 180   @param[in] Alias              The alias to test for.
 181   @param[in] List               The list to search.
 182
 183   @retval TRUE                  The alias is on the list.
 184   @retval FALSE                 The alias is not on the list.
 185 **/
 186 BOOLEAN
 187 EFIAPI
 188 InternalIsAliasOnList(
 189   IN CONST CHAR16       *Alias,
 190   IN CONST LIST_ENTRY   *List
 191   )
 192 {
 193   ALIAS_LIST *Node;
 194
 195   //
 196   // assert for NULL parameter
 197   //
 198   ASSERT(Alias != NULL);
 199
 200   //
 201   // check for the Alias
 202   //
 203   for ( Node = (ALIAS_LIST *)GetFirstNode(List)
 204       ; !IsNull(List, &Node->Link)
 205       ; Node = (ALIAS_LIST *)GetNextNode(List, &Node->Link)
 206      ){
 207     ASSERT(Node->CommandString != NULL);
 208     ASSERT(Node->Alias != NULL);
 209     if (StrCmp(Node->Alias, Alias)==0) {
 210       return (TRUE);
 211     }
 212   }
 213   return (FALSE);
 214 }
 215
 216 /**
 217   Remove an alias from the given list.
 218
 219   @param[in] Alias               The alias to remove.
 220   @param[in, out] List           The list to search.
 221 **/
 222 BOOLEAN
 223 EFIAPI
 224 InternalRemoveAliasFromList(
 225   IN CONST CHAR16       *Alias,
 226   IN OUT LIST_ENTRY     *List
 227   )
 228 {
 229   ALIAS_LIST *Node;
 230
 231   //
 232   // assert for NULL parameter
 233   //
 234   ASSERT(Alias != NULL);
 235
 236   //
 237   // check for the Alias
 238   //
 239   for ( Node = (ALIAS_LIST *)GetFirstNode(List)
 240       ; !IsNull(List, &Node->Link)
 241       ; Node = (ALIAS_LIST *)GetNextNode(List, &Node->Link)
 242      ){
 243     ASSERT(Node->CommandString != NULL);
 244     ASSERT(Node->Alias != NULL);
 245     if (StrCmp(Node->Alias, Alias)==0) {
 246       RemoveEntryList(&Node->Link);
 247       FreePool(Node->Alias);
 248       FreePool(Node->CommandString);
 249       FreePool(Node);
 250       return (TRUE);
 251     }
 252   }
 253   return (FALSE);
 254 }
 255
 256 /**
 257   Function to determine whether a string is decimal or hex representation of a number
 258   and return the number converted from the string.
 259
 260   @param[in] String   String representation of a number
 261
 262   @return             the number
 263   @retval (UINTN)(-1) An error ocurred.
 264 **/
 265 UINTN
 266 EFIAPI
 267 ReturnUintn(
 268   IN CONST CHAR16 *String
 269   )
 270 {
 271   UINT64        RetVal;
 272
 273   if (!EFI_ERROR(ShellConvertStringToUint64(String, &RetVal, FALSE, TRUE))) {
 274     return ((UINTN)RetVal);
 275   }
 276   return ((UINTN)(-1));
 277 }
 278
 279 /**
 280   Function for 'for' command.
 281
 282   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
 283   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
 284 **/
 285 SHELL_STATUS
 286 EFIAPI
 287 ShellCommandRunFor (
 288   IN EFI_HANDLE        ImageHandle,
 289   IN EFI_SYSTEM_TABLE  *SystemTable
 290   )
 291 {
 292   EFI_STATUS          Status;
 293   SHELL_STATUS        ShellStatus;
 294   SCRIPT_FILE         *CurrentScriptFile;
 295   CHAR16              *ArgSet;
 296   CHAR16              *ArgSetWalker;
 297   CHAR16              *Parameter;
 298   UINTN               ArgSize;
 299   UINTN               LoopVar;
 300   SHELL_FOR_INFO      *Info;
 301   CHAR16              *TempString;
 302   CHAR16              *TempSpot;
 303   BOOLEAN             FirstPass;
 304   EFI_SHELL_FILE_INFO *Node;
 305   EFI_SHELL_FILE_INFO *FileList;
 306   UINTN               NewSize;
 307
 308   ArgSet              = NULL;
 309   ArgSize             = 0;
 310   ShellStatus         = SHELL_SUCCESS;
 311   ArgSetWalker        = NULL;
 312   TempString          = NULL;
 313   Parameter           = NULL;
 314   FirstPass           = FALSE;
 315
 316   //
 317   // initialize the shell lib (we must be in non-auto-init...)
 318   //
 319   Status = ShellInitialize();
 320   ASSERT_EFI_ERROR(Status);
 321
 322   Status = CommandInit();
 323   ASSERT_EFI_ERROR(Status);
 324
 325   if (!gEfiShellProtocol->BatchIsActive()) {
 326     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_NO_SCRIPT), gShellLevel1HiiHandle, L"For");
 327     return (SHELL_UNSUPPORTED);
 328   }
 329
 330   if (gEfiShellParametersProtocol->Argc < 4) {
 331     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel1HiiHandle);
 332     return (SHELL_INVALID_PARAMETER);
 333   }
 334
 335   CurrentScriptFile = ShellCommandGetCurrentScriptFile();
 336   ASSERT(CurrentScriptFile != NULL);
 337
 338   if ((CurrentScriptFile->CurrentCommand != NULL) && (CurrentScriptFile->CurrentCommand->Data == NULL)) {
 339     FirstPass = TRUE;
 340
 341     //
 342     // Make sure that an End exists.
 343     //
 344     if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, TRUE, FALSE)) {
 345       ShellPrintHiiEx(
 346         -1,
 347         -1,
 348         NULL,
 349         STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 350         gShellLevel1HiiHandle,
 351         L"EndFor",
 352         L"For",
 353         CurrentScriptFile->CurrentCommand->Line);
 354       return (SHELL_DEVICE_ERROR);
 355     }
 356
 357     //
 358     // Process the line.
 359     //
 360     if (gEfiShellParametersProtocol->Argv[1][0] != L'%' || gEfiShellParametersProtocol->Argv[1][2] != CHAR_NULL
 361       ||!((gEfiShellParametersProtocol->Argv[1][1] >= L'a' && gEfiShellParametersProtocol->Argv[1][1] <= L'z')
 362        ||(gEfiShellParametersProtocol->Argv[1][1] >= L'A' && gEfiShellParametersProtocol->Argv[1][1] <= L'Z'))
 363      ) {
 364       ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_INV_VAR), gShellLevel1HiiHandle, gEfiShellParametersProtocol->Argv[1]);
 365       return (SHELL_INVALID_PARAMETER);
 366     }
 367
 368     if (gUnicodeCollation->StriColl(
 369         gUnicodeCollation,
 370         L"in",
 371         gEfiShellParametersProtocol->Argv[2]) == 0) {
 372       for (LoopVar = 0x3 ; LoopVar < gEfiShellParametersProtocol->Argc ; LoopVar++) {
 373         ASSERT((ArgSet == NULL && ArgSize == 0) || (ArgSet != NULL));
 374         if (StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"*") != NULL
 375           ||StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"?") != NULL
 376           ||StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"[") != NULL
 377           ||StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"]") != NULL) {
 378           FileList = NULL;
 379           Status = ShellOpenFileMetaArg ((CHAR16*)gEfiShellParametersProtocol->Argv[LoopVar], EFI_FILE_MODE_READ, &FileList);
 380           if (EFI_ERROR(Status) || FileList == NULL || IsListEmpty(&FileList->Link)) {
 381             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" \"", 0);
 382             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, gEfiShellParametersProtocol->Argv[LoopVar], 0);
 383             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 384           } else {
 385             for (Node = (EFI_SHELL_FILE_INFO *)GetFirstNode(&FileList->Link)
 386               ;  !IsNull(&FileList->Link, &Node->Link)
 387               ;  Node = (EFI_SHELL_FILE_INFO *)GetNextNode(&FileList->Link, &Node->Link)
 388              ){
 389               ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" \"", 0);
 390               ArgSet = StrnCatGrow(&ArgSet, &ArgSize, Node->FullName, 0);
 391               ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 392             }
 393             ShellCloseFileMetaArg(&FileList);
 394           }
 395         } else {
 396           Parameter = gEfiShellParametersProtocol->Argv[LoopVar];
 397           if (Parameter[0] == L'\"' && Parameter[StrLen(Parameter)-1] == L'\"') {
 398             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 399             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, Parameter, 0);
 400           } else {
 401             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" \"", 0);
 402             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, Parameter, 0);
 403             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 404           }
 405         }
 406       }
 407       if (ArgSet == NULL) {
 408         ShellStatus = SHELL_OUT_OF_RESOURCES;
 409       } else {
 410         //
 411         // set up for an 'in' for loop
 412         //
 413         NewSize = StrSize(ArgSet);
 414         NewSize += sizeof(SHELL_FOR_INFO)+StrSize(gEfiShellParametersProtocol->Argv[1]);
 415         Info = AllocateZeroPool(NewSize);
 416         ASSERT(Info != NULL);
 417         Info->Signature = SHELL_FOR_INFO_SIGNATURE;
 418         CopyMem(Info->Set, ArgSet, StrSize(ArgSet));
 419         NewSize = StrSize(gEfiShellParametersProtocol->Argv[1]);
 420         CopyMem(Info->Set+(StrSize(ArgSet)/sizeof(Info->Set[0])), gEfiShellParametersProtocol->Argv[1], NewSize);
 421         Info->ReplacementName = Info->Set+StrSize(ArgSet)/sizeof(Info->Set[0]);
 422         Info->CurrentValue  = (CHAR16*)Info->Set;
 423         Info->Step          = 0;
 424         Info->Current       = 0;
 425         Info->End           = 0;
 426
 427         if (InternalIsAliasOnList(Info->ReplacementName, &CurrentScriptFile->SubstList)) {
 428           Info->RemoveSubstAlias  = FALSE;
 429         } else {
 430           Info->RemoveSubstAlias  = TRUE;
 431         }
 432         CurrentScriptFile->CurrentCommand->Data = Info;
 433       }
 434     } else if (gUnicodeCollation->StriColl(
 435         gUnicodeCollation,
 436         L"run",
 437         gEfiShellParametersProtocol->Argv[2]) == 0) {
 438       for (LoopVar = 0x3 ; LoopVar < gEfiShellParametersProtocol->Argc ; LoopVar++) {
 439         ASSERT((ArgSet == NULL && ArgSize == 0) || (ArgSet != NULL));
 440         if (ArgSet == NULL) {
 441 //        ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 442         } else {
 443           ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 444         }
 445         ArgSet = StrnCatGrow(&ArgSet, &ArgSize, gEfiShellParametersProtocol->Argv[LoopVar], 0);
 446 //        ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 447       }
 448       if (ArgSet == NULL) {
 449         ShellStatus = SHELL_OUT_OF_RESOURCES;
 450       } else {
 451         //
 452         // set up for a 'run' for loop
 453         //
 454         Info = AllocateZeroPool(sizeof(SHELL_FOR_INFO)+StrSize(gEfiShellParametersProtocol->Argv[1]));
 455         ASSERT(Info != NULL);
 456         Info->Signature = SHELL_FOR_INFO_SIGNATURE;
 457         CopyMem(Info->Set, gEfiShellParametersProtocol->Argv[1], StrSize(gEfiShellParametersProtocol->Argv[1]));
 458         Info->ReplacementName = Info->Set;
 459         Info->CurrentValue    = NULL;
 460         ArgSetWalker            = ArgSet;
 461         if (ArgSetWalker[0] != L'(') {
 462           ShellPrintHiiEx(
 463             -1,
 464             -1,
 465             NULL,
 466             STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 467             gShellLevel1HiiHandle,
 468             ArgSet,
 469             CurrentScriptFile->CurrentCommand->Line);
 470           ShellStatus = SHELL_INVALID_PARAMETER;
 471         } else {
 472           TempSpot = StrStr(ArgSetWalker, L")");
 473           if (TempSpot != NULL) {
 474             TempString = TempSpot+1;
 475             if (*(TempString) != CHAR_NULL) {
 476               while(TempString != NULL && *TempString == L' ') {
 477                 TempString++;
 478               }
 479               if (StrLen(TempString) > 0) {
 480                 TempSpot = NULL;
 481               }
 482             }
 483           }
 484           if (TempSpot == NULL) {
 485             ShellPrintHiiEx(
 486               -1,
 487               -1,
 488               NULL,
 489               STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 490               gShellLevel1HiiHandle,
 491               CurrentScriptFile->CurrentCommand->Line);
 492             ShellStatus = SHELL_INVALID_PARAMETER;
 493           } else {
 494             *TempSpot = CHAR_NULL;
 495             ArgSetWalker++;
 496             while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 497               ArgSetWalker++;
 498             }
 499             if (!ShellIsValidForNumber(ArgSetWalker)) {
 500               ShellPrintHiiEx(
 501                 -1,
 502                 -1,
 503                 NULL,
 504                 STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 505                 gShellLevel1HiiHandle,
 506                 ArgSet,
 507                 CurrentScriptFile->CurrentCommand->Line);
 508               ShellStatus = SHELL_INVALID_PARAMETER;
 509             } else {
 510               if (ArgSetWalker[0] == L'-') {
 511                 Info->Current = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 512               } else {
 513                 Info->Current = (INTN)ReturnUintn(ArgSetWalker);
 514               }
 515               ArgSetWalker  = StrStr(ArgSetWalker, L" ");
 516               while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 517                 ArgSetWalker++;
 518               }
 519               if (ArgSetWalker == NULL || *ArgSetWalker == CHAR_NULL || !ShellIsValidForNumber(ArgSetWalker)){
 520                 ShellPrintHiiEx(
 521                   -1,
 522                   -1,
 523                   NULL,
 524                   STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 525                   gShellLevel1HiiHandle,
 526                   ArgSet,
 527                   CurrentScriptFile->CurrentCommand->Line);
 528                 ShellStatus = SHELL_INVALID_PARAMETER;
 529               } else {
 530                 if (ArgSetWalker[0] == L'-') {
 531                   Info->End = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 532                 } else {
 533                   Info->End = (INTN)ReturnUintn(ArgSetWalker);
 534                 }
 535                 if (Info->Current < Info->End) {
 536                   Info->Step            = 1;
 537                 } else {
 538                   Info->Step            = -1;
 539                 }
 540
 541                 ArgSetWalker  = StrStr(ArgSetWalker, L" ");
 542                 while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 543                   ArgSetWalker++;
 544                 }
 545                 if (ArgSetWalker != NULL && *ArgSetWalker != CHAR_NULL) {
 546                   if (ArgSetWalker == NULL || *ArgSetWalker == CHAR_NULL || !ShellIsValidForNumber(ArgSetWalker)){
 547                     ShellPrintHiiEx(
 548                       -1,
 549                       -1,
 550                       NULL,
 551                       STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 552                       gShellLevel1HiiHandle,
 553                       ArgSet,
 554                       CurrentScriptFile->CurrentCommand->Line);
 555                     ShellStatus = SHELL_INVALID_PARAMETER;
 556                   } else {
 557                     if (*ArgSetWalker == L')') {
 558                       ASSERT(Info->Step == 1 || Info->Step == -1);
 559                     } else {
 560                       if (ArgSetWalker[0] == L'-') {
 561                         Info->Step = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 562                       } else {
 563                         Info->Step = (INTN)ReturnUintn(ArgSetWalker);
 564                       }
 565
 566                       if (StrStr(ArgSetWalker, L" ") != NULL) {
 567                         ShellPrintHiiEx(
 568                           -1,
 569                           -1,
 570                           NULL,
 571                           STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 572                           gShellLevel1HiiHandle,
 573                           ArgSet,
 574                           CurrentScriptFile->CurrentCommand->Line);
 575                         ShellStatus = SHELL_INVALID_PARAMETER;
 576                       }
 577                     }
 578                   }
 579
 580                 }
 581               }
 582             }
 583           }
 584         }
 585         if (ShellStatus == SHELL_SUCCESS) {
 586           if (InternalIsAliasOnList(Info->ReplacementName, &CurrentScriptFile->SubstList)) {
 587             Info->RemoveSubstAlias  = FALSE;
 588           } else {
 589             Info->RemoveSubstAlias  = TRUE;
 590           }
 591         }
 592         if (CurrentScriptFile->CurrentCommand != NULL) {
 593           CurrentScriptFile->CurrentCommand->Data = Info;
 594         }
 595       }
 596     } else {
 597       ShellPrintHiiEx(
 598         -1,
 599         -1,
 600         NULL,
 601         STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 602         gShellLevel1HiiHandle,
 603         ArgSet,
 604         CurrentScriptFile!=NULL
 605           && CurrentScriptFile->CurrentCommand!=NULL
 606           ? CurrentScriptFile->CurrentCommand->Line:0);
 607       ShellStatus = SHELL_INVALID_PARAMETER;
 608     }
 609   } else {
 610     //
 611     // These need to be NULL since they are used to determine if this is the first pass later on...
 612     //
 613     ASSERT(ArgSetWalker == NULL);
 614     ASSERT(ArgSet       == NULL);
 615   }
 616
 617   if (CurrentScriptFile != NULL && CurrentScriptFile->CurrentCommand != NULL) {
 618     Info = (SHELL_FOR_INFO*)CurrentScriptFile->CurrentCommand->Data;
 619     if (CurrentScriptFile->CurrentCommand->Reset) {
 620       Info->CurrentValue  = (CHAR16*)Info->Set;
 621       FirstPass = TRUE;
 622       CurrentScriptFile->CurrentCommand->Reset = FALSE;
 623     }
 624   } else {
 625     ShellStatus = SHELL_UNSUPPORTED;
 626     Info = NULL;
 627   }
 628   if (ShellStatus == SHELL_SUCCESS) {
 629     ASSERT(Info != NULL);
 630     if (Info->Step != 0) {
 631       //
 632       // only advance if not the first pass
 633       //
 634       if (!FirstPass) {
 635         //
 636         // sequence version of for loop...
 637         //
 638         Info->Current += Info->Step;
 639       }
 640
 641       TempString = AllocateZeroPool(50*sizeof(CHAR16));
 642       UnicodeSPrint(TempString, 50*sizeof(CHAR16), L"%d", Info->Current);
 643       InternalUpdateAliasOnList(Info->ReplacementName, TempString, &CurrentScriptFile->SubstList);
 644       FreePool(TempString);
 645
 646       if ((Info->Step > 0 && Info->Current > Info->End) || (Info->Step < 0 && Info->Current < Info->End)) {
 647         CurrentScriptFile->CurrentCommand->Data = NULL;
 648         //
 649         // find the matching endfor (we're done with the loop)
 650         //
 651         if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, FALSE, FALSE)) {
 652           ShellPrintHiiEx(
 653             -1,
 654             -1,
 655             NULL,
 656             STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 657             gShellLevel1HiiHandle,
 658             L"EndFor",
 659             L"For",
 660             CurrentScriptFile!=NULL
 661               && CurrentScriptFile->CurrentCommand!=NULL
 662               ? CurrentScriptFile->CurrentCommand->Line:0);
 663           ShellStatus = SHELL_DEVICE_ERROR;
 664         }
 665         if (Info->RemoveSubstAlias) {
 666           //
 667           // remove item from list
 668           //
 669           InternalRemoveAliasFromList(Info->ReplacementName, &CurrentScriptFile->SubstList);
 670         }
 671         FreePool(Info);
 672       }
 673     } else {
 674       //
 675       // Must be in 'in' version of for loop...
 676       //
 677       ASSERT(Info->Set != NULL);
 678       if (Info->CurrentValue != NULL && *Info->CurrentValue != CHAR_NULL) {
 679         if (Info->CurrentValue[0] == L' ') {
 680           Info->CurrentValue++;
 681         }
 682         if (Info->CurrentValue[0] == L'\"') {
 683           Info->CurrentValue++;
 684         }
 685         //
 686         // do the next one of the set
 687         //
 688         ASSERT(TempString == NULL);
 689         TempString = StrnCatGrow(&TempString, NULL, Info->CurrentValue, 0);
 690         if (TempString == NULL) {
 691           ShellStatus = SHELL_OUT_OF_RESOURCES;
 692         } else {
 693           TempSpot   = StrStr(TempString, L"\" \"");
 694           if (TempSpot != NULL) {
 695             *TempSpot = CHAR_NULL;
 696           }
 697           while (TempString[StrLen(TempString)-1] == L'\"') {
 698             TempString[StrLen(TempString)-1] = CHAR_NULL;
 699           }
 700           InternalUpdateAliasOnList(Info->ReplacementName, TempString, &CurrentScriptFile->SubstList);
 701           Info->CurrentValue += StrLen(TempString);
 702
 703           if (Info->CurrentValue[0] == L'\"') {
 704             Info->CurrentValue++;
 705           }
 706           FreePool(TempString);
 707         }
 708       } else {
 709         CurrentScriptFile->CurrentCommand->Data = NULL;
 710         //
 711         // find the matching endfor (we're done with the loop)
 712         //
 713         if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, FALSE, FALSE)) {
 714           ShellPrintHiiEx(
 715             -1,
 716             -1,
 717             NULL,
 718             STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 719             gShellLevel1HiiHandle,
 720             L"EndFor",
 721             L"For",
 722             CurrentScriptFile!=NULL
 723               && CurrentScriptFile->CurrentCommand!=NULL
 724               ? CurrentScriptFile->CurrentCommand->Line:0);
 725           ShellStatus = SHELL_DEVICE_ERROR;
 726         }
 727         if (Info->RemoveSubstAlias) {
 728           //
 729           // remove item from list
 730           //
 731           InternalRemoveAliasFromList(Info->ReplacementName, &CurrentScriptFile->SubstList);
 732         }
 733         FreePool(Info);
 734       }
 735     }
 736   }
 737   if (ArgSet != NULL) {
 738     FreePool(ArgSet);
 739   }
 740   return (ShellStatus);
 741 }
 742