From d51088b764304f920a41a186bef45ca789e080dc Mon Sep 17 00:00:00 2001
From: jcarsey <jcarsey@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 13 Dec 2012 21:26:22 +0000
Subject: ShellPkg: Updates to 'help' command

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chris Phillips <chrisp@hp.com>
reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13997 6f19259b-4bc3-4df7-8a09-765794883524
---
 .../UefiShellCommandLib/UefiShellCommandLib.c      | 45 +++++++++++++++++++++-
 1 file changed, 43 insertions(+), 2 deletions(-)

(limited to 'ShellPkg/Library/UefiShellCommandLib')

diff --git a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
index fb44768c0b..66a242f66f 100644
--- a/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
+++ b/ShellPkg/Library/UefiShellCommandLib/UefiShellCommandLib.c
@@ -334,6 +334,16 @@ ShellCommandRegisterCommandName (
   )
 {
   SHELL_COMMAND_INTERNAL_LIST_ENTRY *Node;
+  SHELL_COMMAND_INTERNAL_LIST_ENTRY *Command;
+  SHELL_COMMAND_INTERNAL_LIST_ENTRY *PrevCommand;
+  INTN LexicalMatchValue;
+
+  //
+  // Initialize local variables.
+  //
+  Command = NULL;
+  PrevCommand = NULL;
+  LexicalMatchValue = 0;
 
   //
   // ASSERTs for NULL parameters
@@ -392,9 +402,40 @@ ShellCommandRegisterCommandName (
   }
 
   //
-  // add the new struct to the list
+  // Insert a new entry on top of the list
   //
-  InsertTailList (&mCommandList.Link, &Node->Link);
+  InsertHeadList (&mCommandList.Link, &Node->Link);
+
+  //
+  // Move a new registered command to its sorted ordered location in the list
+  //
+  for (Command = (SHELL_COMMAND_INTERNAL_LIST_ENTRY *)GetFirstNode (&mCommandList.Link),
+        PrevCommand = (SHELL_COMMAND_INTERNAL_LIST_ENTRY *)GetFirstNode (&mCommandList.Link)
+        ; !IsNull (&mCommandList.Link, &Command->Link)
+        ; Command = (SHELL_COMMAND_INTERNAL_LIST_ENTRY *)GetNextNode (&mCommandList.Link, &Command->Link)) {
+
+    //
+    // Get Lexical Comparison Value between PrevCommand and Command list entry
+    //
+    LexicalMatchValue = gUnicodeCollation->StriColl (
+                                             gUnicodeCollation,
+                                             PrevCommand->CommandString,
+                                             Command->CommandString
+                                             );
+
+    //
+    // Swap PrevCommand and Command list entry if PrevCommand list entry
+    // is alphabetically greater than Command list entry
+    //
+    if (LexicalMatchValue > 0){
+      Command = (SHELL_COMMAND_INTERNAL_LIST_ENTRY *) SwapListEntries (&PrevCommand->Link, &Command->Link);
+    } else if (LexicalMatchValue < 0) {
+      //
+      // PrevCommand entry is lexically lower than Command entry
+      //
+      break;
+    }
+  }
 
   return (RETURN_SUCCESS);
 }
-- 
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