exconvrt.c

acpi tools for linux include acpiexec and acpixtract

    switch (Base)
    {
    case 10:

        /* Setup max length for the decimal number */

        switch (DataWidth)
        {
        case 1:
            DecimalLength = ACPI_MAX8_DECIMAL_DIGITS;
            break;

        case 4:
            DecimalLength = ACPI_MAX32_DECIMAL_DIGITS;
            break;

        case 8:
        default:
            DecimalLength = ACPI_MAX64_DECIMAL_DIGITS;
            break;
        }

        SupressZeros = TRUE;     /* No leading zeros */
        Remainder = 0;

        for (i = DecimalLength; i > 0; i--)
        {
            /* Divide by nth factor of 10 */

            Digit = Integer;
            for (j = 0; j < i; j++)
            {
                (void) AcpiUtShortDivide (Digit, 10, &Digit, &Remainder);
            }

            /* Handle leading zeros */

            if (Remainder != 0)
            {
                SupressZeros = FALSE;
            }

            if (!SupressZeros)
            {
                String[k] = (UINT8) (ACPI_ASCII_ZERO + Remainder);
                k++;
            }
        }
        break;

    case 16:

        /* HexLength: 2 ascii hex chars per data byte */

        HexLength = (ACPI_NATIVE_UINT) ACPI_MUL_2 (DataWidth);
        for (i = 0, j = (HexLength-1); i < HexLength; i++, j--)
        {
            /* Get one hex digit, most significant digits first */

            String[k] = (UINT8) AcpiUtHexToAsciiChar (Integer, ACPI_MUL_4 (j));
            k++;
        }
        break;

    default:
        return (0);
    }

    /*
     * Since leading zeros are supressed, we must check for the case where
     * the integer equals 0
     *
     * Finally, null terminate the string and return the length
     */
    if (!k)
    {
        String [0] = ACPI_ASCII_ZERO;
        k = 1;
    }

    String [k] = 0;
    return ((UINT32) k);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExConvertToString
 *
 * PARAMETERS:  ObjDesc         - Object to be converted.  Must be an
 *                                Integer, Buffer, or String
 *              ResultDesc      - Where the string object is returned
 *              Type            - String flags (base and conversion type)
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an ACPI Object to a string
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExConvertToString (
    ACPI_OPERAND_OBJECT     *ObjDesc,
    ACPI_OPERAND_OBJECT     **ResultDesc,
    UINT32                  Type)
{
    ACPI_OPERAND_OBJECT     *ReturnDesc;
    UINT8                   *NewBuf;
    UINT32                  i;
    UINT32                  StringLength = 0;
    UINT16                  Base = 16;
    UINT8                   Separator = ',';


    ACPI_FUNCTION_TRACE_PTR (ExConvertToString, ObjDesc);


    switch (ACPI_GET_OBJECT_TYPE (ObjDesc))
    {
    case ACPI_TYPE_STRING:

        /* No conversion necessary */

        *ResultDesc = ObjDesc;
        return_ACPI_STATUS (AE_OK);


    case ACPI_TYPE_INTEGER:

        switch (Type)
        {
        case ACPI_EXPLICIT_CONVERT_DECIMAL:

            /* Make room for maximum decimal number */

            StringLength = ACPI_MAX_DECIMAL_DIGITS;
            Base = 10;
            break;

        default:

            /* Two hex string characters for each integer byte */

            StringLength = ACPI_MUL_2 (AcpiGbl_IntegerByteWidth);
            break;
        }

        /*
         * Create a new String
         * Need enough space for one ASCII integer (plus null terminator)
         */
        ReturnDesc = AcpiUtCreateStringObject ((ACPI_SIZE) StringLength);
        if (!ReturnDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        NewBuf = ReturnDesc->Buffer.Pointer;

        /* Convert integer to string */

        StringLength = AcpiExConvertToAscii (ObjDesc->Integer.Value, Base,
                            NewBuf, AcpiGbl_IntegerByteWidth);

        /* Null terminate at the correct place */

        ReturnDesc->String.Length = StringLength;
        NewBuf [StringLength] = 0;
        break;


    case ACPI_TYPE_BUFFER:

        /* Setup string length, base, and separator */

        switch (Type)
        {
        case ACPI_EXPLICIT_CONVERT_DECIMAL: /* Used by ToDecimalString */
            /*
             * From ACPI: "If Data is a buffer, it is converted to a string of
             * decimal values separated by commas."
             */
            Base = 10;

            /*
             * Calculate the final string length.  Individual string values
             * are variable length (include separator for each)
             */
            for (i = 0; i < ObjDesc->Buffer.Length; i++)
            {
                if (ObjDesc->Buffer.Pointer[i] >= 100)
                {
                    StringLength += 4;
                }
                else if (ObjDesc->Buffer.Pointer[i] >= 10)
                {
                    StringLength += 3;
                }
                else
                {
                    StringLength += 2;
                }
            }
            break;

        case ACPI_IMPLICIT_CONVERT_HEX:
            /*
             * From the ACPI spec:
             *"The entire contents of the buffer are converted to a string of
             * two-character hexadecimal numbers, each separated by a space."
             */
            Separator = ' ';
            StringLength = (ObjDesc->Buffer.Length * 3);
            break;

        case ACPI_EXPLICIT_CONVERT_HEX:     /* Used by ToHexString */
            /*
             * From ACPI: "If Data is a buffer, it is converted to a string of
             * hexadecimal values separated by commas."
             */
            StringLength = (ObjDesc->Buffer.Length * 3);
            break;

        default:
            return_ACPI_STATUS (AE_BAD_PARAMETER);
        }

        /*
         * Create a new string object and string buffer
         * (-1 because of extra separator included in StringLength from above)
         */
        ReturnDesc = AcpiUtCreateStringObject ((ACPI_SIZE) (StringLength - 1));
        if (!ReturnDesc)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }

        NewBuf = ReturnDesc->Buffer.Pointer;

        /*
         * Convert buffer bytes to hex or decimal values
         * (separated by commas or spaces)
         */
        for (i = 0; i < ObjDesc->Buffer.Length; i++)
        {
            NewBuf += AcpiExConvertToAscii (
                        (ACPI_INTEGER) ObjDesc->Buffer.Pointer[i], Base,
                        NewBuf, 1);
            *NewBuf++ = Separator; /* each separated by a comma or space */
        }

        /*
         * Null terminate the string
         * (overwrites final comma/space from above)
         */
        NewBuf--;
        *NewBuf = 0;
        break;

    default:
        return_ACPI_STATUS (AE_TYPE);
    }

    *ResultDesc = ReturnDesc;
    return_ACPI_STATUS (AE_OK);
}


/*******************************************************************************
 *
 * FUNCTION:    AcpiExConvertToTargetType
 *
 * PARAMETERS:  DestinationType     - Current type of the destination
 *              SourceDesc          - Source object to be converted.
 *              ResultDesc          - Where the converted object is returned
 *              WalkState           - Current method state
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Implements "implicit conversion" rules for storing an object.
 *
 ******************************************************************************/

ACPI_STATUS
AcpiExConvertToTargetType (
    ACPI_OBJECT_TYPE        DestinationType,
    ACPI_OPERAND_OBJECT     *SourceDesc,
    ACPI_OPERAND_OBJECT     **ResultDesc,
    ACPI_WALK_STATE         *WalkState)
{
    ACPI_STATUS             Status = AE_OK;


    ACPI_FUNCTION_TRACE (ExConvertToTargetType);


    /* Default behavior */

    *ResultDesc = SourceDesc;

    /*
     * If required by the target,
     * perform implicit conversion on the source before we store it.
     */
    switch (GET_CURRENT_ARG_TYPE (WalkState->OpInfo->RuntimeArgs))
    {
    case ARGI_SIMPLE_TARGET:
    case ARGI_FIXED_TARGET:
    case ARGI_INTEGER_REF:      /* Handles Increment, Decrement cases */

        switch (DestinationType)
        {
        case ACPI_TYPE_LOCAL_REGION_FIELD:
            /*
             * Named field can always handle conversions
             */
            break;

        default:
            /* No conversion allowed for these types */

            if (DestinationType != ACPI_GET_OBJECT_TYPE (SourceDesc))
            {
                ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
                    "Explicit operator, will store (%s) over existing type (%s)\n",
                    AcpiUtGetObjectTypeName (SourceDesc),
                    AcpiUtGetTypeName (DestinationType)));
                Status = AE_TYPE;
            }
        }
        break;


    case ARGI_TARGETREF:

        switch (DestinationType)
        {
        case ACPI_TYPE_INTEGER:
        case ACPI_TYPE_BUFFER_FIELD:
        case ACPI_TYPE_LOCAL_BANK_FIELD:
        case ACPI_TYPE_LOCAL_INDEX_FIELD:
            /*
             * These types require an Integer operand.  We can convert
             * a Buffer or a String to an Integer if necessary.
             */
            Status = AcpiExConvertToInteger (SourceDesc, ResultDesc,
                        16);
            break;


        case ACPI_TYPE_STRING:
            /*
             * The operand must be a String.  We can convert an
             * Integer or Buffer if necessary
             */
            Status = AcpiExConvertToString (SourceDesc, ResultDesc,
                        ACPI_IMPLICIT_CONVERT_HEX);
            break;


        case ACPI_TYPE_BUFFER:
            /*
             * The operand must be a Buffer.  We can convert an
             * Integer or String if necessary
             */
            Status = AcpiExConvertToBuffer (SourceDesc, ResultDesc);
            break;


        default:
            ACPI_ERROR ((AE_INFO, "Bad destination type during conversion: %X",
                DestinationType));
            Status = AE_AML_INTERNAL;
            break;
        }
        break;


    case ARGI_REFERENCE:
        /*
         * CreateXxxxField cases - we are storing the field object into the name
         */
        break;


    default:
        ACPI_ERROR ((AE_INFO,
            "Unknown Target type ID 0x%X AmlOpcode %X DestType %s",
            GET_CURRENT_ARG_TYPE (WalkState->OpInfo->RuntimeArgs),
            WalkState->Opcode, AcpiUtGetTypeName (DestinationType)));
        Status = AE_AML_INTERNAL;
    }

    /*
     * Source-to-Target conversion semantics:
     *
     * If conversion to the target type cannot be performed, then simply
     * overwrite the target with the new object and type.
     */
    if (Status == AE_TYPE)
    {
        Status = AE_OK;
    }

    return_ACPI_STATUS (Status);
}