ShellPkg/Library/UefiShellLevel1CommandsLib/Shift.c

   1 /** @file
   2   Main file for Shift shell level 1 function.
   3
   4   Copyright (c) 2015, Hewlett-Packard Development Company, L.P.<BR>
   5   Copyright (c) 2009 - 2010, 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
  18 /**
  19   Function for 'shift' command.
  20
  21   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  22   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
  23 **/
  24 SHELL_STATUS
  25 EFIAPI
  26 ShellCommandRunShift (
  27   IN EFI_HANDLE        ImageHandle,
  28   IN EFI_SYSTEM_TABLE  *SystemTable
  29   )
  30 {
  31   EFI_STATUS          Status;
  32   SCRIPT_FILE         *CurrentScriptFile;
  33   UINTN               LoopVar;
  34
  35   Status = CommandInit();
  36   ASSERT_EFI_ERROR(Status);
  37
  38   if (!gEfiShellProtocol->BatchIsActive()) {
  39     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_NO_SCRIPT), gShellLevel1HiiHandle, L"shift");
  40     return (SHELL_UNSUPPORTED);
  41   }
  42
  43   CurrentScriptFile = ShellCommandGetCurrentScriptFile();
  44   ASSERT(CurrentScriptFile != NULL);
  45
  46   if (CurrentScriptFile->Argc < 2) {
  47     ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel1HiiHandle, L"shift");
  48     return (SHELL_UNSUPPORTED);
  49   }
  50
  51   for (LoopVar = 0 ; LoopVar < CurrentScriptFile->Argc ; LoopVar++) {
  52     if (LoopVar == 0) {
  53       SHELL_FREE_NON_NULL(CurrentScriptFile->Argv[LoopVar]);
  54     }
  55     if (LoopVar < CurrentScriptFile->Argc -1) {
  56       CurrentScriptFile->Argv[LoopVar] = CurrentScriptFile->Argv[LoopVar+1];
  57     } else {
  58       CurrentScriptFile->Argv[LoopVar] = NULL;
  59     }
  60   }
  61   CurrentScriptFile->Argc--;
  62   return (SHELL_SUCCESS);
  63 }
  64