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 /*******************************************************************************
  *
  * Module Name: nsnames - Name manipulation and search
  *
  ******************************************************************************/
 
 /******************************************************************************
  *
  * 1. Copyright Notice
  *
  * Some or all of this work - Copyright (c) 1999 - 2009, Intel Corp.
  * All rights reserved.
  *
  * 2. License
  *
  * 2.1. This is your license from Intel Corp. under its intellectual property
  * rights.  You may have additional license terms from the party that provided
  * you this software, covering your right to use that party's intellectual
  * property rights.
  *
  * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
  * copy of the source code appearing in this file ("Covered Code") an
  * irrevocable, perpetual, worldwide license under Intel's copyrights in the
  * base code distributed originally by Intel ("Original Intel Code") to copy,
  * make derivatives, distribute, use and display any portion of the Covered
  * Code in any form, with the right to sublicense such rights; and
  *
  * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
  * license (with the right to sublicense), under only those claims of Intel
  * patents that are infringed by the Original Intel Code, to make, use, sell,
  * offer to sell, and import the Covered Code and derivative works thereof
  * solely to the minimum extent necessary to exercise the above copyright
  * license, and in no event shall the patent license extend to any additions
  * to or modifications of the Original Intel Code.  No other license or right
  * is granted directly or by implication, estoppel or otherwise;
  *
  * The above copyright and patent license is granted only if the following
  * conditions are met:
  *
  * 3. Conditions
  *
  * 3.1. Redistribution of Source with Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification with rights to further distribute source must include
  * the above Copyright Notice, the above License, this list of Conditions,
  * and the following Disclaimer and Export Compliance provision.  In addition,
  * Licensee must cause all Covered Code to which Licensee contributes to
  * contain a file documenting the changes Licensee made to create that Covered
  * Code and the date of any change.  Licensee must include in that file the
  * documentation of any changes made by any predecessor Licensee.  Licensee
  * must include a prominent statement that the modification is derived,
  * directly or indirectly, from Original Intel Code.
  *
  * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
  * Redistribution of source code of any substantial portion of the Covered
  * Code or modification without rights to further distribute source must
  * include the following Disclaimer and Export Compliance provision in the
  * documentation and/or other materials provided with distribution.  In
  * addition, Licensee may not authorize further sublicense of source of any
  * portion of the Covered Code, and must include terms to the effect that the
  * license from Licensee to its licensee is limited to the intellectual
  * property embodied in the software Licensee provides to its licensee, and
  * not to intellectual property embodied in modifications its licensee may
  * make.
  *
  * 3.3. Redistribution of Executable. Redistribution in executable form of any
  * substantial portion of the Covered Code or modification must reproduce the
  * above Copyright Notice, and the following Disclaimer and Export Compliance
  * provision in the documentation and/or other materials provided with the
  * distribution.
  *
  * 3.4. Intel retains all right, title, and interest in and to the Original
  * Intel Code.
  *
  * 3.5. Neither the name Intel nor any other trademark owned or controlled by
  * Intel shall be used in advertising or otherwise to promote the sale, use or
  * other dealings in products derived from or relating to the Covered Code
  * without prior written authorization from Intel.
  *
  * 4. Disclaimer and Export Compliance
  *
  * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
  * HERE.  ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
  * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT,  ASSISTANCE,
  * INSTALLATION, TRAINING OR OTHER SERVICES.  INTEL WILL NOT PROVIDE ANY
  * UPDATES, ENHANCEMENTS OR EXTENSIONS.  INTEL SPECIFICALLY DISCLAIMS ANY
  * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
  * PARTICULAR PURPOSE.
  *
  * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
  * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
  * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
  * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
  * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
  * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.  THESE LIMITATIONS
  * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
  * LIMITED REMEDY.
  *
  * 4.3. Licensee shall not export, either directly or indirectly, any of this
  * software or system incorporating such software without first obtaining any
  * required license or other approval from the U. S. Department of Commerce or
  * any other agency or department of the United States Government.  In the
  * event Licensee exports any such software from the United States or
  * re-exports any such software from a foreign destination, Licensee shall
  * ensure that the distribution and export/re-export of the software is in
  * compliance with all laws, regulations, orders, or other restrictions of the
  * U.S. Export Administration Regulations. Licensee agrees that neither it nor
  * any of its subsidiaries will export/re-export any technical data, process,
  * software, or service, directly or indirectly, to any country for which the
  * United States government or any agency thereof requires an export license,
  * other governmental approval, or letter of assurance, without first obtaining
  * such license, approval or letter.
  *
  *****************************************************************************/
 
 #define __NSNAMES_C__
 
 #include "acpi.h"
 #include "accommon.h"
 #include "amlcode.h"
 #include "acnamesp.h"
 
 
 #define _COMPONENT          ACPI_NAMESPACE
         ACPI_MODULE_NAME    ("nsnames")
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsBuildExternalPath
  *
  * PARAMETERS:  Node            - NS node whose pathname is needed
  *              Size            - Size of the pathname
  *              *NameBuffer     - Where to return the pathname
  *
  * RETURN:      Status
  *              Places the pathname into the NameBuffer, in external format
  *              (name segments separated by path separators)
  *
  * DESCRIPTION: Generate a full pathaname
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsBuildExternalPath (
     ACPI_NAMESPACE_NODE     *Node,
     ACPI_SIZE               Size,
     char                    *NameBuffer)
 {
     ACPI_SIZE               Index;
     ACPI_NAMESPACE_NODE     *ParentNode;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     /* Special case for root */
 
     Index = Size - 1;
     if (Index < ACPI_NAME_SIZE)
     {
         NameBuffer[0] = AML_ROOT_PREFIX;
         NameBuffer[1] = 0;
         return (AE_OK);
     }
 
     /* Store terminator byte, then build name backwards */
 
     ParentNode = Node;
     NameBuffer[Index] = 0;
 
     while ((Index > ACPI_NAME_SIZE) && (ParentNode != AcpiGbl_RootNode))
     {
         Index -= ACPI_NAME_SIZE;
 
         /* Put the name into the buffer */
 
         ACPI_MOVE_32_TO_32 ((NameBuffer + Index), &ParentNode->Name);
         ParentNode = AcpiNsGetParentNode (ParentNode);
 
         /* Prefix name with the path separator */
 
         Index--;
         NameBuffer[Index] = ACPI_PATH_SEPARATOR;
     }
 
     /* Overwrite final separator with the root prefix character */
 
     NameBuffer[Index] = AML_ROOT_PREFIX;
 
     if (Index != 0)
     {
         ACPI_ERROR ((AE_INFO,
             "Could not construct external pathname; index=%X, size=%X, Path=%s",
             (UINT32) Index, (UINT32) Size, &NameBuffer[Size]));
 
         return (AE_BAD_PARAMETER);
     }
 
     return (AE_OK);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetExternalPathname
  *
  * PARAMETERS:  Node            - Namespace node whose pathname is needed
  *
  * RETURN:      Pointer to storage containing the fully qualified name of
  *              the node, In external format (name segments separated by path
  *              separators.)
  *
  * DESCRIPTION: Used to obtain the full pathname to a namespace node, usually
  *              for error and debug statements.
  *
  ******************************************************************************/
 
 char *
 AcpiNsGetExternalPathname (
     ACPI_NAMESPACE_NODE     *Node)
 {
     ACPI_STATUS             Status;
     char                    *NameBuffer;
     ACPI_SIZE               Size;
 
 
     ACPI_FUNCTION_TRACE_PTR (NsGetExternalPathname, Node);
 
 
     /* Calculate required buffer size based on depth below root */
 
     Size = AcpiNsGetPathnameLength (Node);
     if (!Size)
     {
         return_PTR (NULL);
     }
 
     /* Allocate a buffer to be returned to caller */
 
     NameBuffer = ACPI_ALLOCATE_ZEROED (Size);
     if (!NameBuffer)
     {
         ACPI_ERROR ((AE_INFO, "Could not allocate %u bytes", (UINT32) Size));
         return_PTR (NULL);
     }
 
     /* Build the path in the allocated buffer */
 
     Status = AcpiNsBuildExternalPath (Node, Size, NameBuffer);
     if (ACPI_FAILURE (Status))
     {
         ACPI_FREE (NameBuffer);
         return_PTR (NULL);
     }
 
     return_PTR (NameBuffer);
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsGetPathnameLength
  *
  * PARAMETERS:  Node        - Namespace node
  *
  * RETURN:      Length of path, including prefix
  *
  * DESCRIPTION: Get the length of the pathname string for this node
  *
  ******************************************************************************/
 
 ACPI_SIZE
 AcpiNsGetPathnameLength (
     ACPI_NAMESPACE_NODE     *Node)
 {
     ACPI_SIZE               Size;
     ACPI_NAMESPACE_NODE     *NextNode;
 
 
     ACPI_FUNCTION_ENTRY ();
 
 
     /*
      * Compute length of pathname as 5 * number of name segments.
      * Go back up the parent tree to the root
      */
     Size = 0;
     NextNode = Node;
 
     while (NextNode && (NextNode != AcpiGbl_RootNode))
     {
         if (ACPI_GET_DESCRIPTOR_TYPE (NextNode) != ACPI_DESC_TYPE_NAMED)
         {
             ACPI_ERROR ((AE_INFO,
                 "Invalid Namespace Node (%p) while traversing namespace",
                 NextNode));
             return 0;
         }
         Size += ACPI_PATH_SEGMENT_LENGTH;
         NextNode = AcpiNsGetParentNode (NextNode);
     }
 
     if (!Size)
     {
         Size = 1; /* Root node case */
     }
 
     return (Size + 1);  /* +1 for null string terminator */
 }
 
 
 /*******************************************************************************
  *
  * FUNCTION:    AcpiNsHandleToPathname
  *
  * PARAMETERS:  TargetHandle            - Handle of named object whose name is
  *                                        to be found
  *              Buffer                  - Where the pathname is returned
  *
  * RETURN:      Status, Buffer is filled with pathname if status is AE_OK
  *
  * DESCRIPTION: Build and return a full namespace pathname
  *
  ******************************************************************************/
 
 ACPI_STATUS
 AcpiNsHandleToPathname (
     ACPI_HANDLE             TargetHandle,
     ACPI_BUFFER             *Buffer)
 {
     ACPI_STATUS             Status;
     ACPI_NAMESPACE_NODE     *Node;
     ACPI_SIZE               RequiredSize;
 
 
     ACPI_FUNCTION_TRACE_PTR (NsHandleToPathname, TargetHandle);
 
 
     Node = AcpiNsMapHandleToNode (TargetHandle);
     if (!Node)
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Determine size required for the caller buffer */
 
     RequiredSize = AcpiNsGetPathnameLength (Node);
     if (!RequiredSize)
     {
         return_ACPI_STATUS (AE_BAD_PARAMETER);
     }
 
     /* Validate/Allocate/Clear caller buffer */
 
     Status = AcpiUtInitializeBuffer (Buffer, RequiredSize);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     /* Build the path in the caller buffer */
 
     Status = AcpiNsBuildExternalPath (Node, RequiredSize, Buffer->Pointer);
     if (ACPI_FAILURE (Status))
     {
         return_ACPI_STATUS (Status);
     }
 
     ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s [%X]\n",
         (char *) Buffer->Pointer, (UINT32) RequiredSize));
     return_ACPI_STATUS (AE_OK);
 }