ShellPkg: Fix echo to support displaying special characters

Run 'echo -t' without the patch will get the result:
  echo: Unknown flag - '-t'
  The expected result is to display '-t' literally.
  This patch adds special handle for 'echo'. 'echo' will not use the
  general parameter parsing library.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

1 files changed, 61 insertions, 80 deletions

diff --git a/ShellPkg/Library/UefiShellLevel3CommandsLib/Echo.c b/ShellPkg/Library/UefiShellLevel3CommandsLib/Echo.c
index a638de8..c98ee85 100644
--- a/ShellPkg/Library/UefiShellLevel3CommandsLib/Echo.c
+++ b/ShellPkg/Library/UefiShellLevel3CommandsLib/Echo.c
@@ -2,7 +2,7 @@
   Main file for Echo shell level 3 function.

 

   (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>

-  Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved. <BR>

+  Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved. <BR>

   This program and the accompanying materials

   are licensed and made available under the terms and conditions of the BSD License

   which accompanies this distribution.  The full text of the license may be found at

@@ -17,12 +17,6 @@
 

 #include <Library/ShellLib.h>

 

-STATIC CONST SHELL_PARAM_ITEM ParamList[] = {

-  {L"-on", TypeFlag},

-  {L"-off", TypeFlag},

-  {NULL, TypeMax}

-  };

-

 /**

   Function for 'echo' command.

 

@@ -36,86 +30,73 @@ ShellCommandRunEcho (
   IN EFI_SYSTEM_TABLE  *SystemTable

   )

 {

-  EFI_STATUS          Status;

-  LIST_ENTRY          *Package;

-  SHELL_STATUS        ShellStatus;

-  UINTN               ParamCount;

-  CHAR16              *ProblemParam;

+  CHAR16              *RawCmdLine;

+  SHELL_STATUS        Status;

   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);

+  CHAR16              *Walker;

+  CHAR16              *TempParameter;

+  BOOLEAN             OnFlag;

+  BOOLEAN             OffFlag;

+  UINTN               Count;

+

+  RawCmdLine = ShellGetRawCmdLine ();

+  if (RawCmdLine == NULL) {

+    return SHELL_OUT_OF_RESOURCES;

+  }

+

+  OnFlag  = FALSE;

+  OffFlag = FALSE;

+

+  Size = StrSize (RawCmdLine);

+  TempParameter  = AllocateZeroPool(Size);

+  if (TempParameter == NULL) {

+    Status = SHELL_OUT_OF_RESOURCES;

+    goto Done;

+  }

+

+  for ( Count = 0

+      , Walker = RawCmdLine

+      ; Walker != NULL && *Walker != CHAR_NULL

+      ; Count++

+      ) {

+    if (EFI_ERROR (ShellGetNextParameter (&Walker, TempParameter, Size, FALSE))) {

+      break;

     }

-    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);

+

+    if (Count == 1) {

+      if (gUnicodeCollation->StriColl(gUnicodeCollation, TempParameter, L"-on") == 0 ) {

+        OnFlag = TRUE;

       }

-    } 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);

-        } 

+      if (gUnicodeCollation->StriColl(gUnicodeCollation, TempParameter, L"-off") == 0 ) {

+        OffFlag = TRUE;

       }

-      ShellPrintEx(-1, -1, L"%s\r\n", PrintString);

-      SHELL_FREE_NON_NULL(PrintString);

+    }

+  }

+

+  if (OnFlag || OffFlag) {

+    if (Count != 2) {

+      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ECHO_INVALID_PARAM), gShellLevel3HiiHandle, L"echo", L"-on/-off");

+      Status = SHELL_INVALID_PARAMETER;

+      goto Done;

     }

 

-    //

-    // free the command line package

-    //

-    ShellCommandLineFreeVarList (Package);

+    ShellCommandSetEchoState(OnFlag);

+    Status = SHELL_SUCCESS;

+    goto Done;

   }

 

-  return (ShellStatus);

+  Walker = RawCmdLine + StrLen (L"echo");

+  if  (*Walker != CHAR_NULL) {

+    Walker++;

+    ShellPrintEx (-1, -1, L"%s\r\n", Walker);

+  }

+

+  Status = SHELL_SUCCESS;

+

+Done:

+  SHELL_FREE_NON_NULL (TempParameter);

+  SHELL_FREE_NON_NULL (RawCmdLine);

+  return Status;

+

 }