[PATCH 1/2] ShellPkg/CommandLib: Locate proper UnicodeCollation instance

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

Original code locates the first UnicodeCollation instance in
DXE Core protocol database.
It's not correct considering multiple UnicodeCollation instances
exist in system.
The patch changes logic to find the one that matches the current
system language.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jaben Carsey <jaben.carsey@intel.com>
---
 .../UefiShellCommandLib/UefiShellCommandLib.c      | 76 ++++++++++++++++++----
 .../UefiShellCommandLib/UefiShellCommandLib.h      |  3 +-
 2 files changed, 67 insertions(+), 12 deletions(-)

diff --git a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
index c7984f11b2..0df252b420 100644
--- a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
+++ b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
@@ -1,7 +1,7 @@
 /** @file
   Provides interface to shell internal functions for shell commands.
 
-  Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
   (C) Copyright 2013-2015 Hewlett-Packard Development Company, L.P.<BR>
   (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
 
@@ -72,14 +72,70 @@ CommandInit(
   VOID
   )
 {
-  EFI_STATUS Status;
+  UINTN                           NumHandles;
+  EFI_HANDLE                      *Handles;
+  EFI_UNICODE_COLLATION_PROTOCOL  *Uc;
+  CHAR8                           *BestLanguage;
+  UINTN                           Index;
+  EFI_STATUS                      Status;
+  CHAR8                           *PlatformLang;
+  
+  GetEfiGlobalVariable2 (EFI_PLATFORM_LANG_VARIABLE_NAME, (VOID**)&PlatformLang, NULL);
+  if (PlatformLang == NULL) {
+    return EFI_UNSUPPORTED;
+  }
+
   if (gUnicodeCollation == NULL) {
-    Status = gBS->LocateProtocol(&gEfiUnicodeCollation2ProtocolGuid, NULL, (VOID**)&gUnicodeCollation);
-    if (EFI_ERROR(Status)) {
-      return (EFI_DEVICE_ERROR);
+    Status = gBS->LocateHandleBuffer (
+                    ByProtocol,
+                    &gEfiUnicodeCollation2ProtocolGuid,
+                    NULL,
+                    &NumHandles,
+                    &Handles
+                    );
+    if (EFI_ERROR (Status)) {
+      NumHandles = 0;
+      Handles    = NULL;
     }
+    for (Index = 0; Index < NumHandles; Index++) {
+      //
+      // Open Unicode Collation Protocol
+      //
+      Status = gBS->OpenProtocol (
+                      Handles[Index],
+                      &gEfiUnicodeCollation2ProtocolGuid,
+                      (VOID **) &Uc,
+                      gImageHandle,
+                      NULL,
+                      EFI_OPEN_PROTOCOL_GET_PROTOCOL
+                      );
+      if (EFI_ERROR (Status)) {
+        continue;
+      }
+
+      //
+      // Find the best matching matching language from the supported languages
+      // of Unicode Collation2 protocol. 
+      //
+      BestLanguage = GetBestLanguage (
+                       Uc->SupportedLanguages,
+                       FALSE,
+                       PlatformLang,
+                       NULL
+                       );
+      if (BestLanguage != NULL) {
+        FreePool (BestLanguage);
+        gUnicodeCollation = Uc;
+        break;
+      }
+    }
+    if (Handles != NULL) {
+      FreePool (Handles);
+    }
+    FreePool (PlatformLang);
   }
-  return (EFI_SUCCESS);
+
+  return (gUnicodeCollation == NULL) ? EFI_UNSUPPORTED : EFI_SUCCESS;
 }
 
 /**
@@ -112,11 +168,9 @@ ShellCommandLibConstructor (
   mProfileListSize  = 0;
   mProfileList      = NULL;
 
-  if (gUnicodeCollation == NULL) {
-    Status = gBS->LocateProtocol(&gEfiUnicodeCollation2ProtocolGuid, NULL, (VOID**)&gUnicodeCollation);
-    if (EFI_ERROR(Status)) {
-      return (EFI_DEVICE_ERROR);
-    }
+  Status = CommandInit ();
+  if (EFI_ERROR (Status)) {
+    return EFI_DEVICE_ERROR;
   }
 
   return (RETURN_SUCCESS);
diff --git a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.h b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.h
index b998656b4e..bcfde60c26 100644
--- a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.h
+++ b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.h
@@ -1,7 +1,7 @@
 /** @file
   Provides interface to shell internal functions for shell commands.
 
-  Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved. <BR>
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved. <BR>
   (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
@@ -19,6 +19,7 @@
 #include <Uefi.h>
 
 #include <Guid/FileInfo.h>
+#include <Guid/GlobalVariable.h>
 
 #include <Protocol/SimpleFileSystem.h>
 #include <Protocol/LoadedImage.h>
-- 
2.15.1.windows.2