ShellPkg/ShellProtocol.c: Fix case sensitivity in GetAlias and SetAlias

ShellCommandIsOnAliasList is case insensitive, but GetAlias and SetAlias use the
UEFI variable services, which are case sensitive.

Force alias names to lowercase to get around this.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Brendan Jackman <Brendan.Jackman@arm.com>
Reviewed-By: Olivier Martin <olivier.martin@arm.com>
Reviewed-by: Jaben Carsey <Jaben.carsey@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15270 6f19259b-4bc3-4df7-8a09-765794883524

diff --git a/ShellPkg/Application/Shell/ShellProtocol.c b/ShellPkg/Application/Shell/ShellProtocol.c
index 52904e9e024f8888c7560f7c80dccabecd64c973..31037bfdc5d906d55ef524357006e7c334ddce34 100644 (file)
--- a/ShellPkg/Application/Shell/ShellProtocol.c
+++ b/ShellPkg/Application/Shell/ShellProtocol.c
@@ -2992,6 +2992,26 @@ InternalEfiShellGetListAlias(
   return (RetVal);\r
 }\r
 \r
+/**\r
+  Convert a null-terminated unicode string, in-place, to all lowercase.\r
+  Then return it.\r
+**/\r
+STATIC\r
+CHAR16 *\r
+ToLower (\r
+  CHAR16 *Str\r
+  )\r
+{\r
+  UINTN Index;\r
+\r
+  for (Index = 0; Str[Index] != L'\0'; Index++) {\r
+    if (Str[Index] >= L'A' && Str[Index] <= L'Z') {\r
+      Str[Index] -= (L'A' - L'a');\r
+    }\r
+  }\r
+  return Str;\r
+}\r
+\r
 /**\r
   This function returns the command associated with a alias or a list of all\r
   alias'.\r
@@ -3021,17 +3041,23 @@ EfiShellGetAlias(
   UINTN       RetSize;\r
   UINT32      Attribs;\r
   EFI_STATUS  Status;\r
+  CHAR16      *AliasLower;\r
 \r
+  // Convert to lowercase to make aliases case-insensitive\r
   if (Alias != NULL) {\r
+    AliasLower = AllocateCopyPool (StrSize (Alias), Alias);\r
+    ASSERT (AliasLower != NULL);\r
+    ToLower (AliasLower);\r
+\r
     if (Volatile == NULL) {\r
-      return (AddBufferToFreeList(GetVariable((CHAR16*)Alias, &gShellAliasGuid)));\r
+      return (AddBufferToFreeList(GetVariable(AliasLower, &gShellAliasGuid)));\r
     }\r
     RetSize = 0;\r
     RetVal = NULL;\r
-    Status = gRT->GetVariable((CHAR16*)Alias, &gShellAliasGuid, &Attribs, &RetSize, RetVal);\r
+    Status = gRT->GetVariable(AliasLower, &gShellAliasGuid, &Attribs, &RetSize, RetVal);\r
     if (Status == EFI_BUFFER_TOO_SMALL) {\r
       RetVal = AllocateZeroPool(RetSize);\r
-      Status = gRT->GetVariable((CHAR16*)Alias, &gShellAliasGuid, &Attribs, &RetSize, RetVal);\r
+      Status = gRT->GetVariable(AliasLower, &gShellAliasGuid, &Attribs, &RetSize, RetVal);\r
     }\r
     if (EFI_ERROR(Status)) {\r
       if (RetVal != NULL) {\r
@@ -3045,6 +3071,7 @@ EfiShellGetAlias(
       *Volatile = TRUE;\r
     }\r
 \r
+    FreePool (AliasLower);\r
     return (AddBufferToFreeList(RetVal));\r
   }\r
   return (AddBufferToFreeList(InternalEfiShellGetListAlias()));\r
@@ -3074,6 +3101,18 @@ InternalSetAlias(
   IN BOOLEAN Volatile\r
   )\r
 {\r
+  EFI_STATUS  Status;\r
+  CHAR16      *AliasLower;\r
+\r
+  // Convert to lowercase to make aliases case-insensitive\r
+  if (Alias != NULL) {\r
+    AliasLower = AllocateCopyPool (StrSize (Alias), Alias);\r
+    ASSERT (AliasLower != NULL);\r
+    ToLower (AliasLower);\r
+  } else {\r
+    AliasLower = NULL;\r
+  }\r
+\r
   //\r
   // We must be trying to remove one if Alias is NULL\r
   //\r
@@ -3081,7 +3120,7 @@ InternalSetAlias(
     //\r
     // remove an alias (but passed in COMMAND parameter)\r
     //\r
-    return (gRT->SetVariable((CHAR16*)Command, &gShellAliasGuid, 0, 0, NULL));\r
+    Status = (gRT->SetVariable((CHAR16*)Command, &gShellAliasGuid, 0, 0, NULL));\r
   } else {\r
     //\r
     // Add and replace are the same\r
@@ -3090,8 +3129,13 @@ InternalSetAlias(
     // We dont check the error return on purpose since the variable may not exist.\r
     gRT->SetVariable((CHAR16*)Command, &gShellAliasGuid, 0, 0, NULL);\r
 \r
-    return (gRT->SetVariable((CHAR16*)Alias, &gShellAliasGuid, EFI_VARIABLE_BOOTSERVICE_ACCESS|(Volatile?0:EFI_VARIABLE_NON_VOLATILE), StrSize(Command), (VOID*)Command));\r
+    Status = (gRT->SetVariable((CHAR16*)Alias, &gShellAliasGuid, EFI_VARIABLE_BOOTSERVICE_ACCESS|(Volatile?0:EFI_VARIABLE_NON_VOLATILE), StrSize(Command), (VOID*)Command));\r
   }\r
+\r
+  if (Alias != NULL) {\r
+    FreePool (AliasLower);\r
+  }\r
+  return Status;\r
 }\r
 \r
 /**\r
@@ -3113,6 +3157,7 @@ InternalSetAlias(
   @retval EFI_NOT_FOUND         the Alias intended to be deleted was not found\r
   @retval EFI_ACCESS_DENIED     The alias is a built-in alias or already existed and Replace was set to\r
                                 FALSE.\r
+  @retval EFI_INVALID_PARAMETER Command is null or the empty string.\r
 **/\r
 EFI_STATUS\r
 EFIAPI\r
@@ -3123,21 +3168,24 @@ EfiShellSetAlias(
   IN BOOLEAN Volatile\r
   )\r
 {\r
-  //\r
-  // cant set over a built in alias\r
-  //\r
   if (ShellCommandIsOnAliasList(Alias==NULL?Command:Alias)) {\r
+    //\r
+    // cant set over a built in alias\r
+    //\r
     return (EFI_ACCESS_DENIED);\r
-  }\r
-  if (Command == NULL || *Command == CHAR_NULL || StrLen(Command) == 0) {\r
+  } else if (Command == NULL || *Command == CHAR_NULL || StrLen(Command) == 0) {\r
+    //\r
+    // Command is null or empty\r
+    //\r
     return (EFI_INVALID_PARAMETER);\r
-  }\r
-\r
-  if (EfiShellGetAlias(Command, NULL) != NULL && !Replace) {\r
+  } else if (EfiShellGetAlias(Command, NULL) != NULL && !Replace) {\r
+    //\r
+    // Alias already exists, Replace not set\r
+    //\r
     return (EFI_ACCESS_DENIED);\r
+  } else {\r
+    return (InternalSetAlias(Command, Alias, Volatile));\r
   }\r
-\r
-  return (InternalSetAlias(Command, Alias, Volatile));\r
 }\r
 \r
 // Pure FILE_HANDLE operations are passed to FileHandleLib\r