exstorob.c File Reference

#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"

Include dependency graph for exstorob.c:

Go to the source code of this file.

Macros
#define	_COMPONENT   ACPI_EXECUTER

Functions
ACPI_STATUS	AcpiExStoreBufferToBuffer (ACPI_OPERAND_OBJECT *SourceDesc, ACPI_OPERAND_OBJECT *TargetDesc)
ACPI_STATUS	AcpiExStoreStringToString (ACPI_OPERAND_OBJECT *SourceDesc, ACPI_OPERAND_OBJECT *TargetDesc)

Macro Definition Documentation

_COMPONENT

#define _COMPONENT   ACPI_EXECUTER

Definition at line 49 of file exstorob.c.

Function Documentation

AcpiExStoreBufferToBuffer()

ACPI_STATUS AcpiExStoreBufferToBuffer	(	ACPI_OPERAND_OBJECT *	SourceDesc,
		ACPI_OPERAND_OBJECT *	TargetDesc
	)

Definition at line 67 of file exstorob.c.

{
    UINT32                  Length;
    UINT8                   *Buffer;
 
 
    ACPI_FUNCTION_TRACE_PTR (ExStoreBufferToBuffer, SourceDesc);
 
 
    /* If Source and Target are the same, just return */
 
    if (SourceDesc == TargetDesc)
    {
        return_ACPI_STATUS (AE_OK);
    }
 
    /* We know that SourceDesc is a buffer by now */
 
    Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->Buffer.Pointer);
    Length = SourceDesc->Buffer.Length;
 
    /*
     * If target is a buffer of length zero or is a static buffer,
     * allocate a new buffer of the proper length
     */
    if ((TargetDesc->Buffer.Length == 0) ||
        (TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER))
    {
        TargetDesc->Buffer.Pointer = ACPI_ALLOCATE (Length);
        if (!TargetDesc->Buffer.Pointer)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }
 
        TargetDesc->Buffer.Length = Length;
    }
 
    /* Copy source buffer to target buffer */
 
    if (Length <= TargetDesc->Buffer.Length)
    {
        /* Clear existing buffer and copy in the new one */
 
        memset (TargetDesc->Buffer.Pointer, 0, TargetDesc->Buffer.Length);
        memcpy (TargetDesc->Buffer.Pointer, Buffer, Length);
 
#ifdef ACPI_OBSOLETE_BEHAVIOR
        /*
         * NOTE: ACPI versions up to 3.0 specified that the buffer must be
         * truncated if the string is smaller than the buffer. However, "other"
         * implementations of ACPI never did this and thus became the defacto
         * standard. ACPI 3.0A changes this behavior such that the buffer
         * is no longer truncated.
         */
 
        /*
         * OBSOLETE BEHAVIOR:
         * If the original source was a string, we must truncate the buffer,
         * according to the ACPI spec. Integer-to-Buffer and Buffer-to-Buffer
         * copy must not truncate the original buffer.
         */
        if (OriginalSrcType == ACPI_TYPE_STRING)
        {
            /* Set the new length of the target */
 
            TargetDesc->Buffer.Length = Length;
        }
#endif
    }
    else
    {
        /* Truncate the source, copy only what will fit */
 
        memcpy (TargetDesc->Buffer.Pointer, Buffer,
            TargetDesc->Buffer.Length);
 
        ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
            "Truncating source buffer from %X to %X\n",
            Length, TargetDesc->Buffer.Length));
    }
 
    /* Copy flags */
 
    TargetDesc->Buffer.Flags = SourceDesc->Buffer.Flags;
    TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
    return_ACPI_STATUS (AE_OK);
}

Referenced by AcpiExStoreObjectToObject().

AcpiExStoreStringToString()

ACPI_STATUS AcpiExStoreStringToString	(	ACPI_OPERAND_OBJECT *	SourceDesc,
		ACPI_OPERAND_OBJECT *	TargetDesc
	)

Definition at line 172 of file exstorob.c.

{
    UINT32                  Length;
    UINT8                   *Buffer;
 
 
    ACPI_FUNCTION_TRACE_PTR (ExStoreStringToString, SourceDesc);
 
 
    /* If Source and Target are the same, just return */
 
    if (SourceDesc == TargetDesc)
    {
        return_ACPI_STATUS (AE_OK);
    }
 
    /* We know that SourceDesc is a string by now */
 
    Buffer = ACPI_CAST_PTR (UINT8, SourceDesc->String.Pointer);
    Length = SourceDesc->String.Length;
 
    /*
     * Replace existing string value if it will fit and the string
     * pointer is not a static pointer (part of an ACPI table)
     */
    if ((Length < TargetDesc->String.Length) &&
       (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
    {
        /*
         * String will fit in existing non-static buffer.
         * Clear old string and copy in the new one
         */
        memset (TargetDesc->String.Pointer, 0,
            (ACPI_SIZE) TargetDesc->String.Length + 1);
        memcpy (TargetDesc->String.Pointer, Buffer, Length);
    }
    else
    {
        /*
         * Free the current buffer, then allocate a new buffer
         * large enough to hold the value
         */
        if (TargetDesc->String.Pointer &&
           (!(TargetDesc->Common.Flags & AOPOBJ_STATIC_POINTER)))
        {
            /* Only free if not a pointer into the DSDT */
 
            ACPI_FREE (TargetDesc->String.Pointer);
        }
 
        TargetDesc->String.Pointer =
            ACPI_ALLOCATE_ZEROED ((ACPI_SIZE) Length + 1);
 
        if (!TargetDesc->String.Pointer)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }
 
        TargetDesc->Common.Flags &= ~AOPOBJ_STATIC_POINTER;
        memcpy (TargetDesc->String.Pointer, Buffer, Length);
    }
 
    /* Set the new target length */
 
    TargetDesc->String.Length = Length;
    return_ACPI_STATUS (AE_OK);
}

Referenced by AcpiExStoreObjectToObject().