ShellPkg/Library/UefiShellLevel3CommandsLib/Echo.c

   1 /** @file
   2   Main file for Echo shell level 3 function.
   3
   4   Copyright (c) 2009 - 2012, 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 "UefiShellLevel3CommandsLib.h"
  16
  17 #include <Library/ShellLib.h>
  18
  19 STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
  20   {L"-on", TypeFlag},
  21   {L"-off", TypeFlag},
  22   {NULL, TypeMax}
  23   };
  24
  25 /**
  26   Function for 'echo' command.
  27
  28   @param[in] ImageHandle  Handle to the Image (NULL if Internal).
  29   @param[in] SystemTable  Pointer to the System Table (NULL if Internal).
  30 **/
  31 SHELL_STATUS
  32 EFIAPI
  33 ShellCommandRunEcho (
  34   IN EFI_HANDLE        ImageHandle,
  35   IN EFI_SYSTEM_TABLE  *SystemTable
  36   )
  37 {
  38   EFI_STATUS          Status;
  39   LIST_ENTRY          *Package;
  40   SHELL_STATUS        ShellStatus;
  41   UINTN               ParamCount;
  42   CHAR16              *ProblemParam;
  43   UINTN               Size;
  44   CHAR16              *PrintString;
  45
  46   Size                = 0;
  47   ProblemParam        = NULL;
  48   PrintString         = NULL;
  49   ShellStatus         = SHELL_SUCCESS;
  50
  51   //
  52   // initialize the shell lib (we must be in non-auto-init...)
  53   //
  54   Status = ShellInitialize();
  55   ASSERT_EFI_ERROR(Status);
  56
  57   //
  58   // parse the command line
  59   //
  60   Status = ShellCommandLineParseEx (ParamList, &Package, &ProblemParam, TRUE, TRUE);
  61   if (EFI_ERROR(Status)) {
  62     if (Status == EFI_VOLUME_CORRUPTED && ProblemParam != NULL) {
  63       ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PROBLEM), gShellLevel3HiiHandle, ProblemParam);
  64       FreePool(ProblemParam);
  65       ShellStatus = SHELL_INVALID_PARAMETER;
  66     } else {
  67       ASSERT(FALSE);
  68     }
  69   } else {
  70     //
  71     // check for "-?"
  72     //
  73     if (ShellCommandLineGetFlag(Package, L"-?")) {
  74       ASSERT(FALSE);
  75     }
  76     if (ShellCommandLineGetFlag(Package, L"-on")) {
  77       //
  78       // Turn it on
  79       //
  80       ShellCommandSetEchoState(TRUE);
  81     } else if (ShellCommandLineGetFlag(Package, L"-off")) {
  82       //
  83       // turn it off
  84       //
  85       ShellCommandSetEchoState(FALSE);
  86     } else if (ShellCommandLineGetRawValue(Package, 1) == NULL) {
  87       //
  88       // output its current state
  89       //
  90       if (ShellCommandGetEchoState()) {
  91         ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ECHO_ON), gShellLevel3HiiHandle);
  92       } else {
  93         ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ECHO_OFF), gShellLevel3HiiHandle);
  94       }
  95     } else {
  96       //
  97       // print the line
  98       //
  99       for ( ParamCount = 1
 100           ; ShellCommandLineGetRawValue(Package, ParamCount) != NULL
 101           ; ParamCount++
 102          ) {
 103         StrnCatGrow(&PrintString, &Size, ShellCommandLineGetRawValue(Package, ParamCount), 0);
 104         if (ShellCommandLineGetRawValue(Package, ParamCount+1) != NULL) {
 105           StrnCatGrow(&PrintString, &Size, L" ", 0);
 106         }
 107       }
 108       ShellPrintEx(-1, -1, L"%s\r\n", PrintString);
 109       SHELL_FREE_NON_NULL(PrintString);
 110     }
 111
 112     //
 113     // free the command line package
 114     //
 115     ShellCommandLineFreeVarList (Package);
 116   }
 117
 118   return (ShellStatus);
 119 }
 120