/*******************************************************************************
*
* Module Name: nsnames - Name manipulation and search
*
******************************************************************************/
/*
* Copyright (C) 2000 - 2018, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include "acpi.h"
#include "accommon.h"
#include "amlcode.h"
#include "acnamesp.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME ("nsnames")
/* Local Prototypes */
static void
AcpiNsNormalizePathname (
char *OriginalPath);
/*******************************************************************************
*
* 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)
{
char *NameBuffer;
ACPI_FUNCTION_TRACE_PTR (NsGetExternalPathname, Node);
NameBuffer = AcpiNsGetNormalizedPathname (Node, FALSE);
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;
/* Validate the Node */
if (ACPI_GET_DESCRIPTOR_TYPE (Node) != ACPI_DESC_TYPE_NAMED)
{
ACPI_ERROR ((AE_INFO,
"Invalid/cached reference target node: %p, descriptor type %d",
Node, ACPI_GET_DESCRIPTOR_TYPE (Node)));
return (0);
}
Size = AcpiNsBuildNormalizedPath (Node, NULL, 0, FALSE);
return (Size);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsHandleToName
*
* PARAMETERS: TargetHandle - Handle of named object whose name is
* to be found
* Buffer - Where the name is returned
*
* RETURN: Status, Buffer is filled with name if status is AE_OK
*
* DESCRIPTION: Build and return a full namespace name
*
******************************************************************************/
ACPI_STATUS
AcpiNsHandleToName (
ACPI_HANDLE TargetHandle,
ACPI_BUFFER *Buffer)
{
ACPI_STATUS Status;
ACPI_NAMESPACE_NODE *Node;
const char *NodeName;
ACPI_FUNCTION_TRACE_PTR (NsHandleToName, TargetHandle);
Node = AcpiNsValidateHandle (TargetHandle);
if (!Node)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Validate/Allocate/Clear caller buffer */
Status = AcpiUtInitializeBuffer (Buffer, ACPI_PATH_SEGMENT_LENGTH);
if (ACPI_FAILURE (Status))
{
return_ACPI_STATUS (Status);
}
/* Just copy the ACPI name from the Node and zero terminate it */
NodeName = AcpiUtGetNodeName (Node);
ACPI_MOVE_NAME (Buffer->Pointer, NodeName);
((char *) Buffer->Pointer) [ACPI_NAME_SIZE] = 0;
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%4.4s\n", (char *) Buffer->Pointer));
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsHandleToPathname
*
* PARAMETERS: TargetHandle - Handle of named object whose name is
* to be found
* Buffer - Where the pathname is returned
* NoTrailing - Remove trailing '_' for each name
* segment
*
* 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,
BOOLEAN NoTrailing)
{
ACPI_STATUS Status;
ACPI_NAMESPACE_NODE *Node;
ACPI_SIZE RequiredSize;
ACPI_FUNCTION_TRACE_PTR (NsHandleToPathname, TargetHandle);
Node = AcpiNsValidateHandle (TargetHandle);
if (!Node)
{
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/* Determine size required for the caller buffer */
RequiredSize = AcpiNsBuildNormalizedPath (Node, NULL, 0, NoTrailing);
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 */
(void) AcpiNsBuildNormalizedPath (Node, Buffer->Pointer,
RequiredSize, NoTrailing);
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "%s [%X]\n",
(char *) Buffer->Pointer, (UINT32) RequiredSize));
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsBuildNormalizedPath
*
* PARAMETERS: Node - Namespace node
* FullPath - Where the path name is returned
* PathSize - Size of returned path name buffer
* NoTrailing - Remove trailing '_' from each name segment
*
* RETURN: Return 1 if the AML path is empty, otherwise returning (length
* of pathname + 1) which means the 'FullPath' contains a trailing
* null.
*
* DESCRIPTION: Build and return a full namespace pathname.
* Note that if the size of 'FullPath' isn't large enough to
* contain the namespace node's path name, the actual required
* buffer length is returned, and it should be greater than
* 'PathSize'. So callers are able to check the returning value
* to determine the buffer size of 'FullPath'.
*
******************************************************************************/
UINT32
AcpiNsBuildNormalizedPath (
ACPI_NAMESPACE_NODE *Node,
char *FullPath,
UINT32 PathSize,
BOOLEAN NoTrailing)
{
UINT32 Length = 0, i;
char Name[ACPI_NAME_SIZE];
BOOLEAN DoNoTrailing;
char c, *Left, *Right;
ACPI_NAMESPACE_NODE *NextNode;
ACPI_FUNCTION_TRACE_PTR (NsBuildNormalizedPath, Node);
#define ACPI_PATH_PUT8(Path, Size, Byte, Length) \
do { \
if ((Length) < (Size)) \
{ \
(Path)[(Length)] = (Byte); \
} \
(Length)++; \
} while (0)
/*
* Make sure the PathSize is correct, so that we don't need to
* validate both FullPath and PathSize.
*/
if (!FullPath)
{
PathSize = 0;
}
if (!Node)
{
goto BuildTrailingNull;
}
NextNode = Node;
while (NextNode && NextNode != AcpiGbl_RootNode)
{
if (NextNode != Node)
{
ACPI_PATH_PUT8(FullPath, PathSize, AML_DUAL_NAME_PREFIX, Length);
}
ACPI_MOVE_32_TO_32 (Name, &NextNode->Name);
DoNoTrailing = NoTrailing;
for (i = 0; i < 4; i++)
{
c = Name[4-i-1];
if (DoNoTrailing && c != '_')
{
DoNoTrailing = FALSE;
}
if (!DoNoTrailing)
{
ACPI_PATH_PUT8(FullPath, PathSize, c, Length);
}
}
NextNode = NextNode->Parent;
}
ACPI_PATH_PUT8(FullPath, PathSize, AML_ROOT_PREFIX, Length);
/* Reverse the path string */
if (Length <= PathSize)
{
Left = FullPath;
Right = FullPath+Length - 1;
while (Left < Right)
{
c = *Left;
*Left++ = *Right;
*Right-- = c;
}
}
/* Append the trailing null */
BuildTrailingNull:
ACPI_PATH_PUT8 (FullPath, PathSize, '\0', Length);
#undef ACPI_PATH_PUT8
return_UINT32 (Length);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsGetNormalizedPathname
*
* PARAMETERS: Node - Namespace node whose pathname is needed
* NoTrailing - Remove trailing '_' from each name segment
*
* 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. All trailing '_' will be
* removed from the full pathname if 'NoTrailing' is specified..
*
******************************************************************************/
char *
AcpiNsGetNormalizedPathname (
ACPI_NAMESPACE_NODE *Node,
BOOLEAN NoTrailing)
{
char *NameBuffer;
ACPI_SIZE Size;
ACPI_FUNCTION_TRACE_PTR (NsGetNormalizedPathname, Node);
/* Calculate required buffer size based on depth below root */
Size = AcpiNsBuildNormalizedPath (Node, NULL, 0, NoTrailing);
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 */
(void) AcpiNsBuildNormalizedPath (Node, NameBuffer, Size, NoTrailing);
ACPI_DEBUG_PRINT_RAW ((ACPI_DB_NAMES, "%s: Path \"%s\"\n",
ACPI_GET_FUNCTION_NAME, NameBuffer));
return_PTR (NameBuffer);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsBuildPrefixedPathname
*
* PARAMETERS: PrefixScope - Scope/Path that prefixes the internal path
* InternalPath - Name or path of the namespace node
*
* RETURN: None
*
* DESCRIPTION: Construct a fully qualified pathname from a concatenation of:
* 1) Path associated with the PrefixScope namespace node
* 2) External path representation of the Internal path
*
******************************************************************************/
char *
AcpiNsBuildPrefixedPathname (
ACPI_GENERIC_STATE *PrefixScope,
const char *InternalPath)
{
ACPI_STATUS Status;
char *FullPath = NULL;
char *ExternalPath = NULL;
char *PrefixPath = NULL;
UINT32 PrefixPathLength = 0;
/* If there is a prefix, get the pathname to it */
if (PrefixScope && PrefixScope->Scope.Node)
{
PrefixPath = AcpiNsGetNormalizedPathname (PrefixScope->Scope.Node, TRUE);
if (PrefixPath)
{
PrefixPathLength = strlen (PrefixPath);
}
}
Status = AcpiNsExternalizeName (ACPI_UINT32_MAX, InternalPath,
NULL, &ExternalPath);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
/* Merge the prefix path and the path. 2 is for one dot and trailing null */
FullPath = ACPI_ALLOCATE_ZEROED (
PrefixPathLength + strlen (ExternalPath) + 2);
if (!FullPath)
{
goto Cleanup;
}
/* Don't merge if the External path is already fully qualified */
if (PrefixPath &&
(*ExternalPath != '\\') &&
(*ExternalPath != '^'))
{
strcat (FullPath, PrefixPath);
if (PrefixPath[1])
{
strcat (FullPath, ".");
}
}
AcpiNsNormalizePathname (ExternalPath);
strcat (FullPath, ExternalPath);
Cleanup:
if (PrefixPath)
{
ACPI_FREE (PrefixPath);
}
if (ExternalPath)
{
ACPI_FREE (ExternalPath);
}
return (FullPath);
}
/*******************************************************************************
*
* FUNCTION: AcpiNsNormalizePathname
*
* PARAMETERS: OriginalPath - Path to be normalized, in External format
*
* RETURN: The original path is processed in-place
*
* DESCRIPTION: Remove trailing underscores from each element of a path.
*
* For example: \A___.B___.C___ becomes \A.B.C
*
******************************************************************************/
static void
AcpiNsNormalizePathname (
char *OriginalPath)
{
char *InputPath = OriginalPath;
char *NewPathBuffer;
char *NewPath;
UINT32 i;
/* Allocate a temp buffer in which to construct the new path */
NewPathBuffer = ACPI_ALLOCATE_ZEROED (strlen (InputPath) + 1);
NewPath = NewPathBuffer;
if (!NewPathBuffer)
{
return;
}
/* Special characters may appear at the beginning of the path */
if (*InputPath == '\\')
{
*NewPath = *InputPath;
NewPath++;
InputPath++;
}
while (*InputPath == '^')
{
*NewPath = *InputPath;
NewPath++;
InputPath++;
}
/* Remainder of the path */
while (*InputPath)
{
/* Do one nameseg at a time */
for (i = 0; (i < ACPI_NAME_SIZE) && *InputPath; i++)
{
if ((i == 0) || (*InputPath != '_')) /* First char is allowed to be underscore */
{
*NewPath = *InputPath;
NewPath++;
}
InputPath++;
}
/* Dot means that there are more namesegs to come */
if (*InputPath == '.')
{
*NewPath = *InputPath;
NewPath++;
InputPath++;
}
}
*NewPath = 0;
strcpy (OriginalPath, NewPathBuffer);
ACPI_FREE (NewPathBuffer);
}