[PATCH] ShellPkg/alias: Fix bug to support upper-case alias

[Ruiyu Ni <ruiyu.ni@intel.com>]

alias in UEFI Shell is case insensitive.
Old code saves the alias to variable storage without
converting the alias to lower-case, which results
upper case alias setting doesn't work.
The patch converts the alias to lower case before saving
to variable storage.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
---
 ShellPkg/Application/Shell/ShellProtocol.c | 50 +++++++++++++++---------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/ShellPkg/Application/Shell/ShellProtocol.c b/ShellPkg/Application/Shell/ShellProtocol.c
index 347e162e62..b3b8acc0d0 100644
--- a/ShellPkg/Application/Shell/ShellProtocol.c
+++ b/ShellPkg/Application/Shell/ShellProtocol.c
@@ -3463,40 +3463,40 @@ InternalSetAlias(
 {
   EFI_STATUS  Status;
   CHAR16      *AliasLower;
+  BOOLEAN     DeleteAlias;
 
-  // Convert to lowercase to make aliases case-insensitive
-  if (Alias != NULL) {
-    AliasLower = AllocateCopyPool (StrSize (Alias), Alias);
-    if (AliasLower == NULL) {
-      return EFI_OUT_OF_RESOURCES;
-    }
-    ToLower (AliasLower);
-  } else {
-    AliasLower = NULL;
-  }
-
-  //
-  // We must be trying to remove one if Alias is NULL
-  //
+  DeleteAlias = FALSE;
   if (Alias == NULL) {
     //
+    // We must be trying to remove one if Alias is NULL
     // remove an alias (but passed in COMMAND parameter)
     //
-    Status = (gRT->SetVariable((CHAR16*)Command, &gShellAliasGuid, 0, 0, NULL));
-  } else {
-    //
-    // Add and replace are the same
-    //
-
-    // We dont check the error return on purpose since the variable may not exist.
-    gRT->SetVariable((CHAR16*)Command, &gShellAliasGuid, 0, 0, NULL);
+    Alias       = Command;
+    DeleteAlias = TRUE;
+  }
+  ASSERT (Alias != NULL);
 
-    Status = (gRT->SetVariable((CHAR16*)Alias, &gShellAliasGuid, EFI_VARIABLE_BOOTSERVICE_ACCESS|(Volatile?0:EFI_VARIABLE_NON_VOLATILE), StrSize(Command), (VOID*)Command));
+  //
+  // Convert to lowercase to make aliases case-insensitive
+  //
+  AliasLower = AllocateCopyPool (StrSize (Alias), Alias);
+  if (AliasLower == NULL) {
+    return EFI_OUT_OF_RESOURCES;
   }
+  ToLower (AliasLower);
 
-  if (Alias != NULL) {
-    FreePool (AliasLower);
+  if (DeleteAlias) {
+    Status = gRT->SetVariable (AliasLower, &gShellAliasGuid, 0, 0, NULL);
+  } else {
+    Status = gRT->SetVariable (
+                    AliasLower, &gShellAliasGuid,
+                    EFI_VARIABLE_BOOTSERVICE_ACCESS | (Volatile ? 0 : EFI_VARIABLE_NON_VOLATILE),
+                    StrSize (Command), (VOID *) Command
+                    );
   }
+
+  FreePool (AliasLower);
+
   return Status;
 }
 
-- 
2.12.2.windows.2