ShellPkg/Library/UefiShellLevel1CommandsLib/Shift.c

   1 /** @file
   2   Main file for Shift shell level 1 function.
   3
   4   Copyright (c) 2009 - 2010, 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
  17 /**
  18   Function for 'shift' command.
  19
  20   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  21   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
  22 **/
  23 SHELL_STATUS
  24 EFIAPI
  25 ShellCommandRunShift (
  26   IN EFI_HANDLE        ImageHandle,
  27   IN EFI_SYSTEM_TABLE  *SystemTable
  28   )
  29 {
  30   EFI_STATUS          Status;
  31   SCRIPT_FILE         *CurrentScriptFile;
  32   UINTN               LoopVar;
  33
  34   Status = CommandInit();
  35   ASSERT_EFI_ERROR(Status);
  36
  37   if (!gEfiShellProtocol->BatchIsActive()) {
  38     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_NO_SCRIPT), gShellLevel1HiiHandle, L"Shift");
  39     return (SHELL_UNSUPPORTED);
  40   }
  41
  42   CurrentScriptFile = ShellCommandGetCurrentScriptFile();
  43   ASSERT(CurrentScriptFile != NULL);
  44
  45   if (CurrentScriptFile->Argc < 2) {
  46     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel1HiiHandle);
  47     return (SHELL_UNSUPPORTED);
  48   }
  49
  50   for (LoopVar = 0 ; LoopVar < CurrentScriptFile->Argc ; LoopVar++) {
  51     if (LoopVar == 0) {
  52       SHELL_FREE_NON_NULL(CurrentScriptFile->Argv[LoopVar]);
  53     }
  54     if (LoopVar < CurrentScriptFile->Argc -1) {
  55       CurrentScriptFile->Argv[LoopVar] = CurrentScriptFile->Argv[LoopVar+1];
  56     } else {
  57       CurrentScriptFile->Argv[LoopVar] = NULL;
  58     }
  59   }
  60   CurrentScriptFile->Argc--;
  61   return (SHELL_SUCCESS);
  62 }
  63