ShellPkg/Library/UefiShellLevel1CommandsLib/For.c

   1 /** @file
   2   Main file for endfor and for shell level 1 functions.
   3
   4   (C) Copyright 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 (StrStr (gEfiShellParametersProtocol->Argv[LoopVar], L")") != NULL &&
 442             (LoopVar + 1) < gEfiShellParametersProtocol->Argc
 443            ) {
 444           return (SHELL_INVALID_PARAMETER);
 445         }
 446         if (ArgSet == NULL) {
 447 //        ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L"\"", 0);
 448         } else {
 449           ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 450         }
 451         ArgSet = StrnCatGrow(&ArgSet, &ArgSize, gEfiShellParametersProtocol->Argv[LoopVar], 0);
 452 //        ArgSet = StrnCatGrow(&ArgSet, &ArgSize, L" ", 0);
 453       }
 454       if (ArgSet == NULL) {
 455         ShellStatus = SHELL_OUT_OF_RESOURCES;
 456       } else {
 457         //
 458         // set up for a 'run' for loop
 459         //
 460         Info = AllocateZeroPool(sizeof(SHELL_FOR_INFO)+StrSize(gEfiShellParametersProtocol->Argv[1]));
 461         ASSERT(Info != NULL);
 462         Info->Signature = SHELL_FOR_INFO_SIGNATURE;
 463         CopyMem(Info->Set, gEfiShellParametersProtocol->Argv[1], StrSize(gEfiShellParametersProtocol->Argv[1]));
 464         Info->ReplacementName = Info->Set;
 465         Info->CurrentValue    = NULL;
 466         ArgSetWalker            = ArgSet;
 467         if (ArgSetWalker[0] != L'(') {
 468           ShellPrintHiiEx(
 469             -1,
 470             -1,
 471             NULL,
 472             STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 473             gShellLevel1HiiHandle,
 474             ArgSet,
 475             CurrentScriptFile->CurrentCommand->Line);
 476           ShellStatus = SHELL_INVALID_PARAMETER;
 477         } else {
 478           TempSpot = StrStr(ArgSetWalker, L")");
 479           if (TempSpot != NULL) {
 480             TempString = TempSpot+1;
 481             if (*(TempString) != CHAR_NULL) {
 482               while(TempString != NULL && *TempString == L' ') {
 483                 TempString++;
 484               }
 485               if (StrLen(TempString) > 0) {
 486                 TempSpot = NULL;
 487               }
 488             }
 489           }
 490           if (TempSpot == NULL) {
 491             ShellPrintHiiEx(
 492               -1,
 493               -1,
 494               NULL,
 495               STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 496               gShellLevel1HiiHandle,
 497               CurrentScriptFile->CurrentCommand->Line);
 498             ShellStatus = SHELL_INVALID_PARAMETER;
 499           } else {
 500             *TempSpot = CHAR_NULL;
 501             ArgSetWalker++;
 502             while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 503               ArgSetWalker++;
 504             }
 505             if (!ShellIsValidForNumber(ArgSetWalker)) {
 506               ShellPrintHiiEx(
 507                 -1,
 508                 -1,
 509                 NULL,
 510                 STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 511                 gShellLevel1HiiHandle,
 512                 ArgSet,
 513                 CurrentScriptFile->CurrentCommand->Line);
 514               ShellStatus = SHELL_INVALID_PARAMETER;
 515             } else {
 516               if (ArgSetWalker[0] == L'-') {
 517                 Info->Current = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 518               } else {
 519                 Info->Current = (INTN)ReturnUintn(ArgSetWalker);
 520               }
 521               ArgSetWalker  = StrStr(ArgSetWalker, L" ");
 522               while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 523                 ArgSetWalker++;
 524               }
 525               if (ArgSetWalker == NULL || *ArgSetWalker == CHAR_NULL || !ShellIsValidForNumber(ArgSetWalker)){
 526                 ShellPrintHiiEx(
 527                   -1,
 528                   -1,
 529                   NULL,
 530                   STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 531                   gShellLevel1HiiHandle,
 532                   ArgSet,
 533                   CurrentScriptFile->CurrentCommand->Line);
 534                 ShellStatus = SHELL_INVALID_PARAMETER;
 535               } else {
 536                 if (ArgSetWalker[0] == L'-') {
 537                   Info->End = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 538                 } else {
 539                   Info->End = (INTN)ReturnUintn(ArgSetWalker);
 540                 }
 541                 if (Info->Current < Info->End) {
 542                   Info->Step            = 1;
 543                 } else {
 544                   Info->Step            = -1;
 545                 }
 546
 547                 ArgSetWalker  = StrStr(ArgSetWalker, L" ");
 548                 while (ArgSetWalker != NULL && ArgSetWalker[0] == L' ') {
 549                   ArgSetWalker++;
 550                 }
 551                 if (ArgSetWalker != NULL && *ArgSetWalker != CHAR_NULL) {
 552                   if (ArgSetWalker == NULL || *ArgSetWalker == CHAR_NULL || !ShellIsValidForNumber(ArgSetWalker)){
 553                     ShellPrintHiiEx(
 554                       -1,
 555                       -1,
 556                       NULL,
 557                       STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 558                       gShellLevel1HiiHandle,
 559                       ArgSet,
 560                       CurrentScriptFile->CurrentCommand->Line);
 561                     ShellStatus = SHELL_INVALID_PARAMETER;
 562                   } else {
 563                     if (*ArgSetWalker == L')') {
 564                       ASSERT(Info->Step == 1 || Info->Step == -1);
 565                     } else {
 566                       if (ArgSetWalker[0] == L'-') {
 567                         Info->Step = 0 - (INTN)ReturnUintn(ArgSetWalker+1);
 568                       } else {
 569                         Info->Step = (INTN)ReturnUintn(ArgSetWalker);
 570                       }
 571
 572                       if (StrStr(ArgSetWalker, L" ") != NULL) {
 573                         ShellPrintHiiEx(
 574                           -1,
 575                           -1,
 576                           NULL,
 577                           STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 578                           gShellLevel1HiiHandle,
 579                           ArgSet,
 580                           CurrentScriptFile->CurrentCommand->Line);
 581                         ShellStatus = SHELL_INVALID_PARAMETER;
 582                       }
 583                     }
 584                   }
 585
 586                 }
 587               }
 588             }
 589           }
 590         }
 591         if (ShellStatus == SHELL_SUCCESS) {
 592           if (InternalIsAliasOnList(Info->ReplacementName, &CurrentScriptFile->SubstList)) {
 593             Info->RemoveSubstAlias  = FALSE;
 594           } else {
 595             Info->RemoveSubstAlias  = TRUE;
 596           }
 597         }
 598         if (CurrentScriptFile->CurrentCommand != NULL) {
 599           CurrentScriptFile->CurrentCommand->Data = Info;
 600         }
 601       }
 602     } else {
 603       ShellPrintHiiEx(
 604         -1,
 605         -1,
 606         NULL,
 607         STRING_TOKEN (STR_GEN_PROBLEM_SCRIPT),
 608         gShellLevel1HiiHandle,
 609         ArgSet,
 610         CurrentScriptFile!=NULL
 611           && CurrentScriptFile->CurrentCommand!=NULL
 612           ? CurrentScriptFile->CurrentCommand->Line:0);
 613       ShellStatus = SHELL_INVALID_PARAMETER;
 614     }
 615   } else {
 616     //
 617     // These need to be NULL since they are used to determine if this is the first pass later on...
 618     //
 619     ASSERT(ArgSetWalker == NULL);
 620     ASSERT(ArgSet       == NULL);
 621   }
 622
 623   if (CurrentScriptFile != NULL && CurrentScriptFile->CurrentCommand != NULL) {
 624     Info = (SHELL_FOR_INFO*)CurrentScriptFile->CurrentCommand->Data;
 625     if (CurrentScriptFile->CurrentCommand->Reset) {
 626       Info->CurrentValue  = (CHAR16*)Info->Set;
 627       FirstPass = TRUE;
 628       CurrentScriptFile->CurrentCommand->Reset = FALSE;
 629     }
 630   } else {
 631     ShellStatus = SHELL_UNSUPPORTED;
 632     Info = NULL;
 633   }
 634   if (ShellStatus == SHELL_SUCCESS) {
 635     ASSERT(Info != NULL);
 636     if (Info->Step != 0) {
 637       //
 638       // only advance if not the first pass
 639       //
 640       if (!FirstPass) {
 641         //
 642         // sequence version of for loop...
 643         //
 644         Info->Current += Info->Step;
 645       }
 646
 647       TempString = AllocateZeroPool(50*sizeof(CHAR16));
 648       UnicodeSPrint(TempString, 50*sizeof(CHAR16), L"%d", Info->Current);
 649       InternalUpdateAliasOnList(Info->ReplacementName, TempString, &CurrentScriptFile->SubstList);
 650       FreePool(TempString);
 651
 652       if ((Info->Step > 0 && Info->Current > Info->End) || (Info->Step < 0 && Info->Current < Info->End)) {
 653         CurrentScriptFile->CurrentCommand->Data = NULL;
 654         //
 655         // find the matching endfor (we're done with the loop)
 656         //
 657         if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, FALSE, FALSE)) {
 658           ShellPrintHiiEx(
 659             -1,
 660             -1,
 661             NULL,
 662             STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 663             gShellLevel1HiiHandle,
 664             L"EndFor",
 665             L"For",
 666             CurrentScriptFile!=NULL
 667               && CurrentScriptFile->CurrentCommand!=NULL
 668               ? CurrentScriptFile->CurrentCommand->Line:0);
 669           ShellStatus = SHELL_DEVICE_ERROR;
 670         }
 671         if (Info->RemoveSubstAlias) {
 672           //
 673           // remove item from list
 674           //
 675           InternalRemoveAliasFromList(Info->ReplacementName, &CurrentScriptFile->SubstList);
 676         }
 677         FreePool(Info);
 678       }
 679     } else {
 680       //
 681       // Must be in 'in' version of for loop...
 682       //
 683       ASSERT(Info->Set != NULL);
 684       if (Info->CurrentValue != NULL && *Info->CurrentValue != CHAR_NULL) {
 685         if (Info->CurrentValue[0] == L' ') {
 686           Info->CurrentValue++;
 687         }
 688         if (Info->CurrentValue[0] == L'\"') {
 689           Info->CurrentValue++;
 690         }
 691         //
 692         // do the next one of the set
 693         //
 694         ASSERT(TempString == NULL);
 695         TempString = StrnCatGrow(&TempString, NULL, Info->CurrentValue, 0);
 696         if (TempString == NULL) {
 697           ShellStatus = SHELL_OUT_OF_RESOURCES;
 698         } else {
 699           TempSpot   = StrStr(TempString, L"\" \"");
 700           if (TempSpot != NULL) {
 701             *TempSpot = CHAR_NULL;
 702           }
 703           while (TempString[StrLen(TempString)-1] == L'\"') {
 704             TempString[StrLen(TempString)-1] = CHAR_NULL;
 705           }
 706           InternalUpdateAliasOnList(Info->ReplacementName, TempString, &CurrentScriptFile->SubstList);
 707           Info->CurrentValue += StrLen(TempString);
 708
 709           if (Info->CurrentValue[0] == L'\"') {
 710             Info->CurrentValue++;
 711           }
 712           FreePool(TempString);
 713         }
 714       } else {
 715         CurrentScriptFile->CurrentCommand->Data = NULL;
 716         //
 717         // find the matching endfor (we're done with the loop)
 718         //
 719         if (!MoveToTag(GetNextNode, L"endfor", L"for", NULL, CurrentScriptFile, TRUE, FALSE, FALSE)) {
 720           ShellPrintHiiEx(
 721             -1,
 722             -1,
 723             NULL,
 724             STRING_TOKEN (STR_SYNTAX_NO_MATCHING),
 725             gShellLevel1HiiHandle,
 726             L"EndFor",
 727             L"For",
 728             CurrentScriptFile!=NULL
 729               && CurrentScriptFile->CurrentCommand!=NULL
 730               ? CurrentScriptFile->CurrentCommand->Line:0);
 731           ShellStatus = SHELL_DEVICE_ERROR;
 732         }
 733         if (Info->RemoveSubstAlias) {
 734           //
 735           // remove item from list
 736           //
 737           InternalRemoveAliasFromList(Info->ReplacementName, &CurrentScriptFile->SubstList);
 738         }
 739         FreePool(Info);
 740       }
 741     }
 742   }
 743   if (ArgSet != NULL) {
 744     FreePool(ArgSet);
 745   }
 746   return (ShellStatus);
 747 }
 748