ShellPkg/Library/UefiShellLevel1CommandsLib/For.c

   1 /** @file
   2   Main file for endfor and for shell level 1 functions.
   3
   4   Copyright (c) 2015, Hewlett-Packard Development Company, L.P.<BR>
   5   Copyright (c) 2009 - 2014, Intel Corporation. All rights reserved.<BR>
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include "UefiShellLevel1CommandsLib.h"
  17 #include <Library/PrintLib.h>
  18
  19 /**
  20   Determine if a valid string is a valid number for the 'for' command.
  21
  22   @param[in] Number The pointer to the string representation of the number to test.
  23
  24   @retval TRUE    The number is valid.
  25   @retval FALSE   The number is not valid.
  26 **/
  27 BOOLEAN
  28 EFIAPI
  29 ShellIsValidForNumber (
  30   IN CONST CHAR16 *Number
  31   )
  32 {
  33   if (Number == NULL || *Number == CHAR_NULL) {
  34     return (FALSE);
  35   }
  36
  37   if (*Number == L'-') {
  38     Number++;
  39   }
  40
  41   if (StrLen(Number) == 0) {
  42     return (FALSE);
  43   }
  44
  45   if (StrLen(Number) >= 7) {
  46     if ((StrStr(Number, L" ") == NULL) || (((StrStr(Number, L" ") != NULL) && (StrStr(Number, L" ") - Number) >= 7))) {
  47       return (FALSE);
  48     }
  49   }
  50
  51   if (!ShellIsDecimalDigitCharacter(*Number)) {
  52     return (FALSE);
  53   }
  54
  55   return (TRUE);
  56 }
  57
  58 /**
  59   Function for 'endfor' command.
  60
  61   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  62   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
  63 **/
  64 SHELL_STATUS
  65 EFIAPI
  66 ShellCommandRunEndFor (
  67   IN EFI_HANDLE        ImageHandle,
  68   IN EFI_SYSTEM_TABLE  *SystemTable
  69   )
  70 {
  71   EFI_STATUS          Status;
  72   BOOLEAN             Found;
  73   SCRIPT_FILE         *CurrentScriptFile;
  74
  75   Status = CommandInit();
  76   ASSERT_EFI_ERROR(Status);
  77
  78   if (!gEfiShellProtocol->BatchIsActive()) {
  79     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_NO_SCRIPT), gShellLevel1HiiHandle, L"endfor");
  80     return (SHELL_UNSUPPORTED);
  81   }
  82
  83   if (gEfiShellParametersProtocol->Argc > 1) {
  84     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellLevel1HiiHandle, L"endfor");
  85     return (SHELL_INVALID_PARAMETER);
  86   }
  87
  88   Found = MoveToTag(GetPreviousNode, L"for", L"endfor", NULL, ShellCommandGetCurrentScriptFile(), FALSE, FALSE, FALSE);
  89
  90   if (!Found) {
  91     CurrentScriptFile = ShellCommandGetCurrentScriptFile();
  92     ShellPrintHiiEx(
  93       -1,
  94       -1,
  95       NULL,
  96       STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
  97       gShellLevel1HiiHandle,
  98       L"For",
  99       L"EndFor",
 100       CurrentScriptFile!=NULL
 101         && CurrentScriptFile->CurrentCommand!=NULL
 102           ? CurrentScriptFile->CurrentCommand->Line:0);
 103     return (SHELL_NOT_FOUND);
 104   }
 105   return (SHELL_SUCCESS);
 106 }
 107
 108 typedef struct {
 109   UINT32          Signature;
 110   INTN            Current;
 111   INTN            End;
 112   INTN            Step;
 113   CHAR16          *ReplacementName;
 114   CHAR16          *CurrentValue;
 115   BOOLEAN         RemoveSubstAlias;
 116   CHAR16          Set[1];
 117   } SHELL_FOR_INFO;
 118 #define SIZE_OF_SHELL_FOR_INFO OFFSET_OF (SHELL_FOR_INFO, Set)
 119 #define SHELL_FOR_INFO_SIGNATURE SIGNATURE_32 ('S', 'F', 'I', 's')
 120
 121 /**
 122   Update the value of a given alias on the list.  If the alias is not there then add it.
 123
 124   @param[in] Alias               The alias to test for.
 125   @param[in] CommandString       The updated command string.
 126   @param[in, out] List           The list to search.
 127
 128   @retval EFI_SUCCESS           The operation was completed successfully.
 129   @retval EFI_OUT_OF_RESOURCES  There was not enough free memory.
 130 **/
 131 EFI_STATUS
 132 EFIAPI
 133 InternalUpdateAliasOnList(
 134   IN CONST CHAR16       *Alias,
 135   IN CONST CHAR16       *CommandString,
 136   IN OUT LIST_ENTRY     *List
 137   )
 138 {
 139   ALIAS_LIST *Node;
 140   BOOLEAN    Found;
 141
 142   //
 143   // assert for NULL parameter
 144   //
 145   ASSERT(Alias != NULL);
 146
 147   //
 148   // check for the Alias
 149   //
 150   for ( Node = (ALIAS_LIST *)GetFirstNode(List), Found = FALSE
 151       ; !IsNull(List, &Node->Link)
 152       ; Node = (ALIAS_LIST *)GetNextNode(List, &Node->Link)
 153      ){
 154     ASSERT(Node->CommandString != NULL);
 155     ASSERT(Node->Alias != NULL);
 156     if (StrCmp(Node->Alias, Alias)==0) {
 157       FreePool(Node->CommandString);
 158       Node->CommandString = NULL;
 159       Node->CommandString = StrnCatGrow(&Node->CommandString, NULL, CommandString, 0);
 160       Found = TRUE;
 161       break;
 162     }
 163   }
 164   if (!Found) {
 165     Node = AllocateZeroPool(sizeof(ALIAS_LIST));
 166     if (Node == NULL) {
 167       return (EFI_OUT_OF_RESOURCES);
 168     }
 169     ASSERT(Node->Alias == NULL);
 170     Node->Alias         = StrnCatGrow(&Node->Alias, NULL, Alias, 0);
 171     ASSERT(Node->CommandString == NULL);
 172     Node->CommandString = StrnCatGrow(&Node->CommandString, NULL, CommandString, 0);
 173     InsertTailList(List, &Node->Link);
 174   }
 175   return (EFI_SUCCESS);
 176 }
 177
 178 /**
 179   Find out if an alias is on the given list.
 180
 181   @param[in] Alias              The alias to test for.
 182   @param[in] List               The list to search.
 183
 184   @retval TRUE                  The alias is on the list.
 185   @retval FALSE                 The alias is not on the list.
 186 **/
 187 BOOLEAN
 188 EFIAPI
 189 InternalIsAliasOnList(
 190   IN CONST CHAR16       *Alias,
 191   IN CONST LIST_ENTRY   *List
 192   )
 193 {
 194   ALIAS_LIST *Node;
 195
 196   //
 197   // assert for NULL parameter
 198   //
 199   ASSERT(Alias != NULL);
 200
 201   //
 202   // check for the Alias
 203   //
 204   for ( Node = (ALIAS_LIST *)GetFirstNode(List)
 205       ; !IsNull(List, &Node->Link)
 206       ; Node = (ALIAS_LIST *)GetNextNode(List, &Node->Link)
 207      ){
 208     ASSERT(Node->CommandString != NULL);
 209     ASSERT(Node->Alias != NULL);
 210     if (StrCmp(Node->Alias, Alias)==0) {
 211       return (TRUE);
 212     }
 213   }
 214   return (FALSE);
 215 }
 216
 217 /**
 218   Remove an alias from the given list.
 219
 220   @param[in] Alias               The alias to remove.
 221   @param[in, out] List           The list to search.
 222 **/
 223 BOOLEAN
 224 EFIAPI
 225 InternalRemoveAliasFromList(
 226   IN CONST CHAR16       *Alias,
 227   IN OUT LIST_ENTRY     *List
 228   )
 229 {
 230   ALIAS_LIST *Node;
 231
 232   //
 233   // assert for NULL parameter
 234   //
 235   ASSERT(Alias != NULL);
 236
 237   //
 238   // check for the Alias
 239   //
 240   for ( Node = (ALIAS_LIST *)GetFirstNode(List)
 241       ; !IsNull(List, &Node->Link)
 242       ; Node = (ALIAS_LIST *)GetNextNode(List, &Node->Link)
 243      ){
 244     ASSERT(Node->CommandString != NULL);
 245     ASSERT(Node->Alias != NULL);
 246     if (StrCmp(Node->Alias, Alias)==0) {
 247       RemoveEntryList(&Node->Link);
 248       FreePool(Node->Alias);
 249       FreePool(Node->CommandString);
 250       FreePool(Node);
 251       return (TRUE);
 252     }
 253   }
 254   return (FALSE);
 255 }
 256
 257 /**
 258   Function to determine whether a string is decimal or hex representation of a number
 259   and return the number converted from the string.
 260
 261   @param[in] String   String representation of a number
 262
 263   @return             the number
 264   @retval (UINTN)(-1) An error ocurred.
 265 **/
 266 UINTN
 267 EFIAPI
 268 ReturnUintn(
 269   IN CONST CHAR16 *String
 270   )
 271 {
 272   UINT64        RetVal;
 273
 274   if (!EFI_ERROR(ShellConvertStringToUint64(String, &RetVal, FALSE, TRUE))) {
 275     return ((UINTN)RetVal);
 276   }
 277   return ((UINTN)(-1));
 278 }
 279
 280 /**
 281   Function for 'for' command.
 282
 283   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
 284   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
 285 **/
 286 SHELL_STATUS
 287 EFIAPI
 288 ShellCommandRunFor (
 289   IN EFI_HANDLE        ImageHandle,
 290   IN EFI_SYSTEM_TABLE  *SystemTable
 291   )
 292 {
 293   EFI_STATUS          Status;
 294   SHELL_STATUS        ShellStatus;
 295   SCRIPT_FILE         *CurrentScriptFile;
 296   CHAR16              *ArgSet;
 297   CHAR16              *ArgSetWalker;
 298   CHAR16              *Parameter;
 299   UINTN               ArgSize;
 300   UINTN               LoopVar;
 301   SHELL_FOR_INFO      *Info;
 302   CHAR16              *TempString;
 303   CHAR16              *TempSpot;
 304   BOOLEAN             FirstPass;
 305   EFI_SHELL_FILE_INFO *Node;
 306   EFI_SHELL_FILE_INFO *FileList;
 307   UINTN               NewSize;
 308
 309   ArgSet              = NULL;
 310   ArgSize             = 0;
 311   ShellStatus         = SHELL_SUCCESS;
 312   ArgSetWalker        = NULL;
 313   TempString          = NULL;
 314   Parameter           = NULL;
 315   FirstPass           = FALSE;
 316
 317   //
 318   // initialize the shell lib (we must be in non-auto-init...)
 319   //
 320   Status = ShellInitialize();
 321   ASSERT_EFI_ERROR(Status);
 322
 323   Status = CommandInit();
 324   ASSERT_EFI_ERROR(Status);
 325
 326   if (!gEfiShellProtocol->BatchIsActive()) {
 327     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_NO_SCRIPT), gShellLevel1HiiHandle, L"for");
 328     return (SHELL_UNSUPPORTED);
 329   }
 330
 331   if (gEfiShellParametersProtocol->Argc < 4) {
 332     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel1HiiHandle, L"for");
 333     return (SHELL_INVALID_PARAMETER);
 334   }
 335
 336   CurrentScriptFile = ShellCommandGetCurrentScriptFile();
 337   ASSERT(CurrentScriptFile != NULL);
 338
 339   if ((CurrentScriptFile->CurrentCommand != NULL) && (CurrentScriptFile->CurrentCommand->Data == NULL)) {
 340     FirstPass = TRUE;
 341
 342     //
 343     // Make sure that an End exists.
 344     //
 345     if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, TRUE, FALSE)) {
 346       ShellPrintHiiEx(
 347         -1,
 348         -1,
 349         NULL,
 350         STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 351         gShellLevel1HiiHandle,
 352         L"EndFor",
 353         L"For",
 354         CurrentScriptFile->CurrentCommand->Line);
 355       return (SHELL_DEVICE_ERROR);
 356     }
 357
 358     //
 359     // Process the line.
 360     //
 361     if (gEfiShellParametersProtocol->Argv[1][0] != L'%' || gEfiShellParametersProtocol->Argv[1][2] != CHAR_NULL
 362       ||!((gEfiShellParametersProtocol->Argv[1][1] >= L'a' && gEfiShellParametersProtocol->Argv[1][1] <= L'z')
 363        ||(gEfiShellParametersProtocol->Argv[1][1] >= L'A' && gEfiShellParametersProtocol->Argv[1][1] <= L'Z'))
 364      ) {
 365       ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_INV_VAR), gShellLevel1HiiHandle, gEfiShellParametersProtocol->Argv[1]);
 366       return (SHELL_INVALID_PARAMETER);
 367     }
 368
 369     if (gUnicodeCollation->StriColl(
 370         gUnicodeCollation,
 371         L"in",
 372         gEfiShellParametersProtocol->Argv[2]) == 0) {
 373       for (LoopVar = 0x3 ; LoopVar < gEfiShellParametersProtocol->Argc ; LoopVar++) {
 374         ASSERT((ArgSet == NULL && ArgSize == 0) || (ArgSet != NULL));
 375         if (StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"*") != NULL
 376           ||StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"?") != NULL
 377           ||StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"[") != NULL
 378           ||StrStr(gEfiShellParametersProtocol->Argv[LoopVar], L"]") != NULL) {
 379           FileList = NULL;
 380           Status = ShellOpenFileMetaArg ((CHAR16*)gEfiShellParametersProtocol->Argv[LoopVar], EFI_FILE_MODE_READ, &FileList);
 381           if (EFI_ERROR(Status) || FileList == NULL || IsListEmpty(&FileList->Link)) {
 382             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" \"", 0);
 383             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, gEfiShellParametersProtocol->Argv[LoopVar], 0);
 384             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 385           } else {
 386             for (Node = (EFI_SHELL_FILE_INFO *)GetFirstNode(&FileList->Link)
 387               ;  !IsNull(&FileList->Link, &Node->Link)
 388               ;  Node = (EFI_SHELL_FILE_INFO *)GetNextNode(&FileList->Link, &Node->Link)
 389              ){
 390               ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" \"", 0);
 391               ArgSet = StrnCatGrow(&ArgSet, &ArgSize, Node->FullName, 0);
 392               ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 393             }
 394             ShellCloseFileMetaArg(&FileList);
 395           }
 396         } else {
 397           Parameter = gEfiShellParametersProtocol->Argv[LoopVar];
 398           if (Parameter[0] == L'\"' && Parameter[StrLen(Parameter)-1] == L'\"') {
 399             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 400             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, Parameter, 0);
 401           } else {
 402             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" \"", 0);
 403             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, Parameter, 0);
 404             ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 405           }
 406         }
 407       }
 408       if (ArgSet == NULL) {
 409         ShellStatus = SHELL_OUT_OF_RESOURCES;
 410       } else {
 411         //
 412         // set up for an 'in' for loop
 413         //
 414         NewSize = StrSize(ArgSet);
 415         NewSize += sizeof(SHELL_FOR_INFO)+StrSize(gEfiShellParametersProtocol->Argv[1]);
 416         Info = AllocateZeroPool(NewSize);
 417         ASSERT(Info != NULL);
 418         Info->Signature = SHELL_FOR_INFO_SIGNATURE;
 419         CopyMem(Info->Set, ArgSet, StrSize(ArgSet));
 420         NewSize = StrSize(gEfiShellParametersProtocol->Argv[1]);
 421         CopyMem(Info->Set+(StrSize(ArgSet)/sizeof(Info->Set[0])), gEfiShellParametersProtocol->Argv[1], NewSize);
 422         Info->ReplacementName = Info->Set+StrSize(ArgSet)/sizeof(Info->Set[0]);
 423         Info->CurrentValue  = (CHAR16*)Info->Set;
 424         Info->Step          = 0;
 425         Info->Current       = 0;
 426         Info->End           = 0;
 427
 428         if (InternalIsAliasOnList(Info->ReplacementName, &CurrentScriptFile->SubstList)) {
 429           Info->RemoveSubstAlias  = FALSE;
 430         } else {
 431           Info->RemoveSubstAlias  = TRUE;
 432         }
 433         CurrentScriptFile->CurrentCommand->Data = Info;
 434       }
 435     } else if (gUnicodeCollation->StriColl(
 436         gUnicodeCollation,
 437         L"run",
 438         gEfiShellParametersProtocol->Argv[2]) == 0) {
 439       for (LoopVar = 0x3 ; LoopVar < gEfiShellParametersProtocol->Argc ; LoopVar++) {
 440         ASSERT((ArgSet == NULL && ArgSize == 0) || (ArgSet != NULL));
 441         if (ArgSet == NULL) {
 442 //        ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 443         } else {
 444           ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 445         }
 446         ArgSet = StrnCatGrow(&ArgSet, &ArgSize, gEfiShellParametersProtocol->Argv[LoopVar], 0);
 447 //        ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 448       }
 449       if (ArgSet == NULL) {
 450         ShellStatus = SHELL_OUT_OF_RESOURCES;
 451       } else {
 452         //
 453         // set up for a 'run' for loop
 454         //
 455         Info = AllocateZeroPool(sizeof(SHELL_FOR_INFO)+StrSize(gEfiShellParametersProtocol->Argv[1]));
 456         ASSERT(Info != NULL);
 457         Info->Signature = SHELL_FOR_INFO_SIGNATURE;
 458         CopyMem(Info->Set, gEfiShellParametersProtocol->Argv[1], StrSize(gEfiShellParametersProtocol->Argv[1]));
 459         Info->ReplacementName = Info->Set;
 460         Info->CurrentValue    = NULL;
 461         ArgSetWalker            = ArgSet;
 462         if (ArgSetWalker[0] != L'(') {
 463           ShellPrintHiiEx(
 464             -1,
 465             -1,
 466             NULL,
 467             STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 468             gShellLevel1HiiHandle,
 469             ArgSet,
 470             CurrentScriptFile->CurrentCommand->Line);
 471           ShellStatus = SHELL_INVALID_PARAMETER;
 472         } else {
 473           TempSpot = StrStr(ArgSetWalker, L")");
 474           if (TempSpot != NULL) {
 475             TempString = TempSpot+1;
 476             if (*(TempString) != CHAR_NULL) {
 477               while(TempString != NULL && *TempString == L' ') {
 478                 TempString++;
 479               }
 480               if (StrLen(TempString) > 0) {
 481                 TempSpot = NULL;
 482               }
 483             }
 484           }
 485           if (TempSpot == NULL) {
 486             ShellPrintHiiEx(
 487               -1,
 488               -1,
 489               NULL,
 490               STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 491               gShellLevel1HiiHandle,
 492               CurrentScriptFile->CurrentCommand->Line);
 493             ShellStatus = SHELL_INVALID_PARAMETER;
 494           } else {
 495             *TempSpot = CHAR_NULL;
 496             ArgSetWalker++;
 497             while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 498               ArgSetWalker++;
 499             }
 500             if (!ShellIsValidForNumber(ArgSetWalker)) {
 501               ShellPrintHiiEx(
 502                 -1,
 503                 -1,
 504                 NULL,
 505                 STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 506                 gShellLevel1HiiHandle,
 507                 ArgSet,
 508                 CurrentScriptFile->CurrentCommand->Line);
 509               ShellStatus = SHELL_INVALID_PARAMETER;
 510             } else {
 511               if (ArgSetWalker[0] == L'-') {
 512                 Info->Current = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 513               } else {
 514                 Info->Current = (INTN)ReturnUintn(ArgSetWalker);
 515               }
 516               ArgSetWalker  = StrStr(ArgSetWalker, L" ");
 517               while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 518                 ArgSetWalker++;
 519               }
 520               if (ArgSetWalker == NULL || *ArgSetWalker == CHAR_NULL || !ShellIsValidForNumber(ArgSetWalker)){
 521                 ShellPrintHiiEx(
 522                   -1,
 523                   -1,
 524                   NULL,
 525                   STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 526                   gShellLevel1HiiHandle,
 527                   ArgSet,
 528                   CurrentScriptFile->CurrentCommand->Line);
 529                 ShellStatus = SHELL_INVALID_PARAMETER;
 530               } else {
 531                 if (ArgSetWalker[0] == L'-') {
 532                   Info->End = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 533                 } else {
 534                   Info->End = (INTN)ReturnUintn(ArgSetWalker);
 535                 }
 536                 if (Info->Current < Info->End) {
 537                   Info->Step            = 1;
 538                 } else {
 539                   Info->Step            = -1;
 540                 }
 541
 542                 ArgSetWalker  = StrStr(ArgSetWalker, L" ");
 543                 while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 544                   ArgSetWalker++;
 545                 }
 546                 if (ArgSetWalker != NULL && *ArgSetWalker != CHAR_NULL) {
 547                   if (ArgSetWalker == NULL || *ArgSetWalker == CHAR_NULL || !ShellIsValidForNumber(ArgSetWalker)){
 548                     ShellPrintHiiEx(
 549                       -1,
 550                       -1,
 551                       NULL,
 552                       STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 553                       gShellLevel1HiiHandle,
 554                       ArgSet,
 555                       CurrentScriptFile->CurrentCommand->Line);
 556                     ShellStatus = SHELL_INVALID_PARAMETER;
 557                   } else {
 558                     if (*ArgSetWalker == L')') {
 559                       ASSERT(Info->Step == 1 || Info->Step == -1);
 560                     } else {
 561                       if (ArgSetWalker[0] == L'-') {
 562                         Info->Step = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 563                       } else {
 564                         Info->Step = (INTN)ReturnUintn(ArgSetWalker);
 565                       }
 566
 567                       if (StrStr(ArgSetWalker, L" ") != NULL) {
 568                         ShellPrintHiiEx(
 569                           -1,
 570                           -1,
 571                           NULL,
 572                           STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 573                           gShellLevel1HiiHandle,
 574                           ArgSet,
 575                           CurrentScriptFile->CurrentCommand->Line);
 576                         ShellStatus = SHELL_INVALID_PARAMETER;
 577                       }
 578                     }
 579                   }
 580
 581                 }
 582               }
 583             }
 584           }
 585         }
 586         if (ShellStatus == SHELL_SUCCESS) {
 587           if (InternalIsAliasOnList(Info->ReplacementName, &CurrentScriptFile->SubstList)) {
 588             Info->RemoveSubstAlias  = FALSE;
 589           } else {
 590             Info->RemoveSubstAlias  = TRUE;
 591           }
 592         }
 593         if (CurrentScriptFile->CurrentCommand != NULL) {
 594           CurrentScriptFile->CurrentCommand->Data = Info;
 595         }
 596       }
 597     } else {
 598       ShellPrintHiiEx(
 599         -1,
 600         -1,
 601         NULL,
 602         STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 603         gShellLevel1HiiHandle,
 604         ArgSet,
 605         CurrentScriptFile!=NULL
 606           && CurrentScriptFile->CurrentCommand!=NULL
 607           ? CurrentScriptFile->CurrentCommand->Line:0);
 608       ShellStatus = SHELL_INVALID_PARAMETER;
 609     }
 610   } else {
 611     //
 612     // These need to be NULL since they are used to determine if this is the first pass later on...
 613     //
 614     ASSERT(ArgSetWalker == NULL);
 615     ASSERT(ArgSet       == NULL);
 616   }
 617
 618   if (CurrentScriptFile != NULL && CurrentScriptFile->CurrentCommand != NULL) {
 619     Info = (SHELL_FOR_INFO*)CurrentScriptFile->CurrentCommand->Data;
 620     if (CurrentScriptFile->CurrentCommand->Reset) {
 621       Info->CurrentValue  = (CHAR16*)Info->Set;
 622       FirstPass = TRUE;
 623       CurrentScriptFile->CurrentCommand->Reset = FALSE;
 624     }
 625   } else {
 626     ShellStatus = SHELL_UNSUPPORTED;
 627     Info = NULL;
 628   }
 629   if (ShellStatus == SHELL_SUCCESS) {
 630     ASSERT(Info != NULL);
 631     if (Info->Step != 0) {
 632       //
 633       // only advance if not the first pass
 634       //
 635       if (!FirstPass) {
 636         //
 637         // sequence version of for loop...
 638         //
 639         Info->Current += Info->Step;
 640       }
 641
 642       TempString = AllocateZeroPool(50*sizeof(CHAR16));
 643       UnicodeSPrint(TempString, 50*sizeof(CHAR16), L"%d", Info->Current);
 644       InternalUpdateAliasOnList(Info->ReplacementName, TempString, &CurrentScriptFile->SubstList);
 645       FreePool(TempString);
 646
 647       if ((Info->Step > 0 && Info->Current > Info->End) || (Info->Step < 0 && Info->Current < Info->End)) {
 648         CurrentScriptFile->CurrentCommand->Data = NULL;
 649         //
 650         // find the matching endfor (we're done with the loop)
 651         //
 652         if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, FALSE, FALSE)) {
 653           ShellPrintHiiEx(
 654             -1,
 655             -1,
 656             NULL,
 657             STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 658             gShellLevel1HiiHandle,
 659             L"EndFor",
 660             L"For",
 661             CurrentScriptFile!=NULL
 662               && CurrentScriptFile->CurrentCommand!=NULL
 663               ? CurrentScriptFile->CurrentCommand->Line:0);
 664           ShellStatus = SHELL_DEVICE_ERROR;
 665         }
 666         if (Info->RemoveSubstAlias) {
 667           //
 668           // remove item from list
 669           //
 670           InternalRemoveAliasFromList(Info->ReplacementName, &CurrentScriptFile->SubstList);
 671         }
 672         FreePool(Info);
 673       }
 674     } else {
 675       //
 676       // Must be in 'in' version of for loop...
 677       //
 678       ASSERT(Info->Set != NULL);
 679       if (Info->CurrentValue != NULL && *Info->CurrentValue != CHAR_NULL) {
 680         if (Info->CurrentValue[0] == L' ') {
 681           Info->CurrentValue++;
 682         }
 683         if (Info->CurrentValue[0] == L'\"') {
 684           Info->CurrentValue++;
 685         }
 686         //
 687         // do the next one of the set
 688         //
 689         ASSERT(TempString == NULL);
 690         TempString = StrnCatGrow(&TempString, NULL, Info->CurrentValue, 0);
 691         if (TempString == NULL) {
 692           ShellStatus = SHELL_OUT_OF_RESOURCES;
 693         } else {
 694           TempSpot   = StrStr(TempString, L"\" \"");
 695           if (TempSpot != NULL) {
 696             *TempSpot = CHAR_NULL;
 697           }
 698           while (TempString[StrLen(TempString)-1] == L'\"') {
 699             TempString[StrLen(TempString)-1] = CHAR_NULL;
 700           }
 701           InternalUpdateAliasOnList(Info->ReplacementName, TempString, &CurrentScriptFile->SubstList);
 702           Info->CurrentValue += StrLen(TempString);
 703
 704           if (Info->CurrentValue[0] == L'\"') {
 705             Info->CurrentValue++;
 706           }
 707           FreePool(TempString);
 708         }
 709       } else {
 710         CurrentScriptFile->CurrentCommand->Data = NULL;
 711         //
 712         // find the matching endfor (we're done with the loop)
 713         //
 714         if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, FALSE, FALSE)) {
 715           ShellPrintHiiEx(
 716             -1,
 717             -1,
 718             NULL,
 719             STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 720             gShellLevel1HiiHandle,
 721             L"EndFor",
 722             L"For",
 723             CurrentScriptFile!=NULL
 724               && CurrentScriptFile->CurrentCommand!=NULL
 725               ? CurrentScriptFile->CurrentCommand->Line:0);
 726           ShellStatus = SHELL_DEVICE_ERROR;
 727         }
 728         if (Info->RemoveSubstAlias) {
 729           //
 730           // remove item from list
 731           //
 732           InternalRemoveAliasFromList(Info->ReplacementName, &CurrentScriptFile->SubstList);
 733         }
 734         FreePool(Info);
 735       }
 736     }
 737   }
 738   if (ArgSet != NULL) {
 739     FreePool(ArgSet);
 740   }
 741   return (ShellStatus);
 742 }
 743