From 93a8153dcfc869acaabf1a30b071bd21e66267ae Mon Sep 17 00:00:00 2001
From: Qiu Shumin <shumin.qiu@intel.com>
Date: Wed, 6 Jan 2016 07:43:58 +0000
Subject: ShellPkg: Make 'alias' can display a single alias name.

When we run command "alias cat" Shell print out "alias: Too few arguments". This patch makes value of single alias name can be displayed.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19608 6f19259b-4bc3-4df7-8a09-765794883524
(cherry picked from commit 7f9c4a515adc08f831990ea721bba3f3fa933717)
---
 ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c b/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c
index 1161746cc7..bcd14c8541 100644
--- a/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c
+++ b/ShellPkg/Library/UefiShellLevel3CommandsLib/Alias.c
@@ -2,7 +2,7 @@
   Main file for Alias shell level 3 function.
 
   (C) Copyright 2015 Hewlett-Packard Development Company, L.P.<BR>
-  Copyright (c) 2009 - 2014, 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
@@ -92,6 +92,8 @@ ShellCommandRunAlias (
   CONST CHAR16        *Param1;
   CONST CHAR16        *Param2;
   CHAR16              *CleanParam2;
+  CONST CHAR16        *ConstAliasVal;
+  BOOLEAN             Volatile;
 
   ProblemParam        = NULL;
   ShellStatus         = SHELL_SUCCESS;
@@ -165,8 +167,19 @@ ShellCommandRunAlias (
         }
       }
     } else if (ShellCommandLineGetCount(Package) == 2) {
-      ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_FEW), gShellLevel3HiiHandle, L"alias");  
-      ShellStatus = SHELL_INVALID_PARAMETER;
+      //
+      // print out a single alias
+      //
+      ConstAliasVal = gEfiShellProtocol->GetAlias(Param1, &Volatile);
+      if (ConstAliasVal == NULL) {
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_PARAM_INV), gShellLevel3HiiHandle, L"alias", Param1);
+        ShellStatus = SHELL_INVALID_PARAMETER;
+      } else {
+        if (ShellCommandIsOnAliasList(Param1)) {
+          Volatile = FALSE;
+        }
+        ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_ALIAS_OUTPUT), gShellLevel3HiiHandle, !Volatile?L' ':L'*', Param1, ConstAliasVal);
+      }      
     } else {
       ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN (STR_GEN_TOO_MANY), gShellLevel3HiiHandle, L"alias");  
       ShellStatus = SHELL_INVALID_PARAMETER;
-- 
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