ShellPkg/Library/UefiShellLevel3CommandsLib/Echo.c

   1 /** @file
   2   Main file for Echo shell level 3 function.
   3
   4   (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
   5   Copyright (c) 2009 - 2012, 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 "UefiShellLevel3CommandsLib.h"
  17
  18 #include <Library/ShellLib.h>
  19
  20 STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
  21   {L"-on", TypeFlag},
  22   {L"-off", TypeFlag},
  23   {NULL, TypeMax}
  24   };
  25
  26 /**
  27   Function for 'echo' command.
  28
  29   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  30   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
  31 **/
  32 SHELL_STATUS
  33 EFIAPI
  34 ShellCommandRunEcho (
  35   IN EFI_HANDLE        ImageHandle,
  36   IN EFI_SYSTEM_TABLE  *SystemTable
  37   )
  38 {
  39   EFI_STATUS          Status;
  40   LIST_ENTRY          *Package;
  41   SHELL_STATUS        ShellStatus;
  42   UINTN               ParamCount;
  43   CHAR16              *ProblemParam;
  44   UINTN               Size;
  45   CHAR16              *PrintString;
  46
  47   Size                = 0;
  48   ProblemParam        = NULL;
  49   PrintString         = NULL;
  50   ShellStatus         = SHELL_SUCCESS;
  51
  52   //
  53   // initialize the shell lib (we must be in non-auto-init...)
  54   //
  55   Status = ShellInitialize();
  56   ASSERT_EFI_ERROR(Status);
  57
  58   //
  59   // parse the command line
  60   //
  61   Status = ShellCommandLineParseEx (ParamList, &Package, &ProblemParam, TRUE, TRUE);
  62   if (EFI_ERROR(Status)) {
  63     if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
  64       ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellLevel3HiiHandle, L"echo", ProblemParam);
  65       FreePool(ProblemParam);
  66       ShellStatus = SHELL_INVALID_PARAMETER;
  67     } else {
  68       ASSERT(FALSE);
  69     }
  70   } else {
  71     //
  72     // check for "-?"
  73     //
  74     if (ShellCommandLineGetFlag(Package, L"-?")) {
  75       ASSERT(FALSE);
  76     }
  77     if (ShellCommandLineGetFlag(Package, L"-on")) {
  78       //
  79       // Turn it on
  80       //
  81       ShellCommandSetEchoState(TRUE);
  82     } else if (ShellCommandLineGetFlag(Package, L"-off")) {
  83       //
  84       // turn it off
  85       //
  86       ShellCommandSetEchoState(FALSE);
  87     } else if (ShellCommandLineGetRawValue(Package, 1) == NULL) {
  88       //
  89       // output its current state
  90       //
  91       if (ShellCommandGetEchoState()) {
  92         ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ECHO_ON), gShellLevel3HiiHandle);
  93       } else {
  94         ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ECHO_OFF), gShellLevel3HiiHandle);
  95       }
  96     } else {
  97       //
  98       // print the line
  99       //
 100       for ( ParamCount = 1
 101           ; ShellCommandLineGetRawValue(Package, ParamCount) != NULL
 102           ; ParamCount++
 103          ) {
 104         StrnCatGrow(&PrintString, &Size, ShellCommandLineGetRawValue(Package, ParamCount), 0);
 105         if (ShellCommandLineGetRawValue(Package, ParamCount+1) != NULL) {
 106           StrnCatGrow(&PrintString, &Size, L" ", 0);
 107         }
 108       }
 109       ShellPrintEx(-1, -1, L"%s\r\n", PrintString);
 110       SHELL_FREE_NON_NULL(PrintString);
 111     }
 112
 113     //
 114     // free the command line package
 115     //
 116     ShellCommandLineFreeVarList (Package);
 117   }
 118
 119   return (ShellStatus);
 120 }
 121