Shift.c

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#include "UefiShellLevel1CommandsLib.h"
 
SHELL_STATUS
EFIAPI
ShellCommandRunShift (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS   Status;
  SCRIPT_FILE  *CurrentScriptFile;
  UINTN        LoopVar;
 
  Status = CommandInit ();
  ASSERT_EFI_ERROR (Status);
 
  if (!gEfiShellProtocol->BatchIsActive ()) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_NO_SCRIPT), gShellLevel1HiiHandle, L"shift");
    return (SHELL_UNSUPPORTED);
  }
 
  CurrentScriptFile = ShellCommandGetCurrentScriptFile ();
  if (CurrentScriptFile == NULL) {
    ASSERT (CurrentScriptFile != NULL);
    return (SHELL_INVALID_PARAMETER);
  }
 
  if (CurrentScriptFile->Argc < 2) {
    ShellPrintHiiEx (-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel1HiiHandle, L"shift");
    return (SHELL_UNSUPPORTED);
  }
 
  for (LoopVar = 0; LoopVar < CurrentScriptFile->Argc; LoopVar++) {
    if (LoopVar == 0) {
      SHELL_FREE_NON_NULL (CurrentScriptFile->Argv[LoopVar]);
    }
 
    if (LoopVar < CurrentScriptFile->Argc -1) {
      CurrentScriptFile->Argv[LoopVar] = CurrentScriptFile->Argv[LoopVar+1];
    } else {
      CurrentScriptFile->Argv[LoopVar] = NULL;
    }
  }
 
  CurrentScriptFile->Argc--;
  return (SHELL_SUCCESS);
}