ShellPkg/Library/UefiShellLevel3CommandsLib/Echo.c

/** @file
  Main file for Echo shell level 3 function.

  (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved. <BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "UefiShellLevel3CommandsLib.h"

#include <Library/ShellLib.h>

STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
  {L"-on", TypeFlag},
  {L"-off", TypeFlag},
  {NULL, TypeMax}
  };

/**
  Function for 'echo' command.

  @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
**/
SHELL_STATUS
EFIAPI
ShellCommandRunEcho (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS          Status;
  LIST_ENTRY          *Package;
  SHELL_STATUS        ShellStatus;
  UINTN               ParamCount;
  CHAR16              *ProblemParam;
  UINTN               Size;
  CHAR16              *PrintString;

  Size                = 0;
  ProblemParam        = NULL;
  PrintString         = NULL;
  ShellStatus         = SHELL_SUCCESS;

  //
  // initialize the shell lib (we must be in non-auto-init...)
  //
  Status = ShellInitialize();
  ASSERT_EFI_ERROR(Status);

  //
  // parse the command line
  //
  Status = ShellCommandLineParseEx (ParamList, &Package, &ProblemParam, TRUE, TRUE);
  if (EFI_ERROR(Status)) {
    if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellLevel3HiiHandle, L"echo", ProblemParam);
      FreePool(ProblemParam);
      ShellStatus = SHELL_INVALID_PARAMETER;
    } else {
      ASSERT(FALSE);
    }
  } else {
    //
    // check for "-?"
    //
    if (ShellCommandLineGetFlag(Package, L"-?")) {
      ASSERT(FALSE);
    }
    if (ShellCommandLineGetFlag(Package, L"-on")) {
      //
      // Turn it on
      //
      ShellCommandSetEchoState(TRUE);
    } else if (ShellCommandLineGetFlag(Package, L"-off")) {
      //
      // turn it off
      //
      ShellCommandSetEchoState(FALSE);
    } else if (ShellCommandLineGetRawValue(Package, 1) == NULL) {
      //
      // output its current state
      //
      if (ShellCommandGetEchoState()) {
        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ECHO_ON), gShellLevel3HiiHandle);
      } else {
        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ECHO_OFF), gShellLevel3HiiHandle);
      }
    } else {
      //
      // print the line
      //
      for ( ParamCount = 1
          ; ShellCommandLineGetRawValue(Package, ParamCount) != NULL
          ; ParamCount++
         ) {
        StrnCatGrow(&PrintString, &Size, ShellCommandLineGetRawValue(Package, ParamCount), 0);
        if (ShellCommandLineGetRawValue(Package, ParamCount+1) != NULL) {
          StrnCatGrow(&PrintString, &Size, L" ", 0);
        }
      }
      ShellPrintEx(-1, -1, L"%s\r\n", PrintString);
      SHELL_FREE_NON_NULL(PrintString);
    }

    //
    // free the command line package
    //
    ShellCommandLineFreeVarList (Package);
  }

  return (ShellStatus);
}