//  [c]
SQLRETURN SQLSetDescFieldW( SQLHDESC descriptor_handle,
           SQLSMALLINT rec_number, 
           SQLSMALLINT field_identifier,
           SQLPOINTER value, 
           SQLINTEGER buffer_length )
{
    /*
     * not quite sure how the descriptor can be
     * allocated to a statement, all the documentation talks
     * about state transitions on statement states, but the
     * descriptor may be allocated with more than one statement
     * at one time. Which one should I check ?
     */
    DMHDESC descriptor = (DMHDESC) descriptor_handle;
    SQLRETURN ret;
    SQLCHAR s1[ 100 + LOG_MESSAGE_LEN ];
    int isStrField = 0;

    /*
     * check descriptor
     */

    if ( !__validate_desc( descriptor ))
    {
        dm_log_write( __FILE__, 
                    __LINE__, 
                    LOG_INFO, 
                    LOG_INFO, 
                    "Error: SQL_INVALID_HANDLE" );

#ifdef WITH_HANDLE_REDIRECT
		{
			DMHDESC parent_desc;

			parent_desc = find_parent_handle( descriptor, SQL_HANDLE_DESC );

			if ( parent_desc ) {
        		dm_log_write( __FILE__, 
                	__LINE__, 
                    	LOG_INFO, 
                    	LOG_INFO, 
                    	"Info: found parent handle" );

				if ( CHECK_SQLSETDESCFIELDW( parent_desc -> connection ))
				{
        			dm_log_write( __FILE__, 
                		__LINE__, 
                   		 	LOG_INFO, 
                   		 	LOG_INFO, 
                   		 	"Info: calling redirected driver function" );

                	return  SQLSETDESCFIELDW( parent_desc -> connection,
							descriptor,
							rec_number,
							field_identifier,
							value,
							buffer_length );
				}
			}
		}
#endif
        return SQL_INVALID_HANDLE;
    }

    function_entry( descriptor );

    if ( log_info.log_flag )
    {
        sprintf( descriptor -> msg, "\n\t\tEntry:\
\n\t\t\tDescriptor = %p\
\n\t\t\tRec Number = %d\
\n\t\t\tField Ident = %s\
\n\t\t\tValue = %p\
\n\t\t\tBuffer Length = %d",
                descriptor,
                rec_number,
                __desc_attr_as_string( s1, field_identifier ),
                value, 
                (int)buffer_length );

        dm_log_write( __FILE__, 
                __LINE__, 
                LOG_INFO, 
                LOG_INFO, 
                descriptor -> msg );
    }

    thread_protect( SQL_HANDLE_DESC, descriptor );

    if ( descriptor -> connection -> state < STATE_C4 )
    {
        dm_log_write( __FILE__, 
                __LINE__, 
                LOG_INFO, 
                LOG_INFO, 
                "Error: HY010" );

        __post_internal_error( &descriptor -> error,
                ERROR_HY010, NULL,
                descriptor -> connection -> environment -> requested_version );

        return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
    }

    /*
     * check status of statements associated with this descriptor
     */

    if( __check_stmt_from_desc( descriptor, STATE_S8 ) ||
        __check_stmt_from_desc( descriptor, STATE_S9 ) ||
        __check_stmt_from_desc( descriptor, STATE_S10 ) ||
        __check_stmt_from_desc( descriptor, STATE_S11 ) ||
        __check_stmt_from_desc( descriptor, STATE_S12 ) ||
        __check_stmt_from_desc( descriptor, STATE_S13 ) ||
        __check_stmt_from_desc( descriptor, STATE_S14 ) ||
        __check_stmt_from_desc( descriptor, STATE_S15 )) {

        dm_log_write( __FILE__, 
                __LINE__, 
                LOG_INFO, 
                LOG_INFO, 
                "Error: HY010" );

        __post_internal_error( &descriptor -> error,
                ERROR_HY010, NULL,
                descriptor -> connection -> environment -> requested_version );

        return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
    }

    if ( rec_number < 0 )
    {
        __post_internal_error( &descriptor -> error,
                ERROR_07009, NULL,
                descriptor -> connection -> environment -> requested_version );

        return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
    }

    switch ( field_identifier )
    {
    /* Fixed-length fields: buffer_length is ignored */
    case SQL_DESC_ALLOC_TYPE:
    case SQL_DESC_ARRAY_SIZE:
    case SQL_DESC_ARRAY_STATUS_PTR:
    case SQL_DESC_BIND_OFFSET_PTR:
    case SQL_DESC_BIND_TYPE:
    case SQL_DESC_COUNT:
    case SQL_DESC_ROWS_PROCESSED_PTR:
    case SQL_DESC_AUTO_UNIQUE_VALUE:
    case SQL_DESC_CASE_SENSITIVE:
    case SQL_DESC_CONCISE_TYPE:
    case SQL_DESC_DATA_PTR:
    case SQL_DESC_DATETIME_INTERVAL_CODE:
    case SQL_DESC_DATETIME_INTERVAL_PRECISION:
    case SQL_DESC_DISPLAY_SIZE:
    case SQL_DESC_FIXED_PREC_SCALE:
    case SQL_DESC_INDICATOR_PTR:
    case SQL_DESC_LENGTH:
    case SQL_DESC_NULLABLE:
    case SQL_DESC_NUM_PREC_RADIX:
    case SQL_DESC_OCTET_LENGTH:
    case SQL_DESC_OCTET_LENGTH_PTR:
    case SQL_DESC_PARAMETER_TYPE:
    case SQL_DESC_PRECISION:
    case SQL_DESC_ROWVER:
    case SQL_DESC_SCALE:
    case SQL_DESC_SEARCHABLE:
    case SQL_DESC_TYPE:
    case SQL_DESC_UNNAMED:
    case SQL_DESC_UNSIGNED:
    case SQL_DESC_UPDATABLE:
        isStrField = 0;
        break;
    /* Pointer to data: buffer_length must be valid */
    case SQL_DESC_BASE_COLUMN_NAME:
    case SQL_DESC_BASE_TABLE_NAME:
    case SQL_DESC_CATALOG_NAME:
    case SQL_DESC_LABEL:
    case SQL_DESC_LITERAL_PREFIX:
    case SQL_DESC_LITERAL_SUFFIX:
    case SQL_DESC_LOCAL_TYPE_NAME:
    case SQL_DESC_NAME:
    case SQL_DESC_SCHEMA_NAME:
    case SQL_DESC_TABLE_NAME:
    case SQL_DESC_TYPE_NAME:
        isStrField = 1;
        break;
    default:
        isStrField = buffer_length != SQL_IS_POINTER && buffer_length != SQL_IS_INTEGER
            && buffer_length != SQL_IS_UINTEGER && buffer_length != SQL_IS_SMALLINT &&
            buffer_length != SQL_IS_USMALLINT;
    }
    
    if ( isStrField && buffer_length < 0 && buffer_length != SQL_NTS)
    {
        __post_internal_error( &descriptor -> error,
            ERROR_HY090, NULL,
            descriptor -> connection -> environment -> requested_version );

        return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
    }

    if ( field_identifier == SQL_DESC_COUNT && (SQLINTEGER)value < 0 )
    {
        __post_internal_error( &descriptor -> error,
                ERROR_07009, NULL,
                descriptor -> connection -> environment -> requested_version );

        return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
    }

    if ( field_identifier == SQL_DESC_PARAMETER_TYPE && value != SQL_PARAM_INPUT
        && value != SQL_PARAM_OUTPUT && value != SQL_PARAM_INPUT_OUTPUT &&
        value != SQL_PARAM_INPUT_OUTPUT_STREAM && value != SQL_PARAM_OUTPUT_STREAM )
    {
        __post_internal_error( &descriptor -> error,
                ERROR_HY105, NULL,
                descriptor -> connection -> environment -> requested_version );

        return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
    }

    if ( descriptor -> connection -> unicode_driver ||
		    CHECK_SQLSETDESCFIELDW( descriptor -> connection ))
	{
    	if ( !CHECK_SQLSETDESCFIELDW( descriptor -> connection ))
    	{
        	dm_log_write( __FILE__, 
                __LINE__, 
                LOG_INFO, 
                LOG_INFO, 
                "Error: IM001" );

        	__post_internal_error( &descriptor -> error,
                ERROR_IM001, NULL,
                descriptor -> connection -> environment -> requested_version );

        	return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
		}

    	ret = SQLSETDESCFIELDW( descriptor -> connection,
            	descriptor -> driver_desc,
            	rec_number, 
            	field_identifier,
            	value, 
            	buffer_length );
	
    	if ( log_info.log_flag )
    	{
        	sprintf( descriptor -> msg, 
                	"\n\t\tExit:[%s]",
                    	__get_return_status( ret, s1 ));
	
        	dm_log_write( __FILE__, 
                	__LINE__, 
                	LOG_INFO, 
                	LOG_INFO, 
                	descriptor -> msg );
    	}
	}
	else
	{
		SQLCHAR *ascii_str = NULL;

    	if ( !CHECK_SQLSETDESCFIELD( descriptor -> connection ))
    	{
        	dm_log_write( __FILE__, 
                __LINE__, 
                LOG_INFO, 
                LOG_INFO, 
                "Error: IM001" );

        	__post_internal_error( &descriptor -> error,
                ERROR_IM001, NULL,
                descriptor -> connection -> environment -> requested_version );

        	return function_return_nodrv( SQL_HANDLE_DESC, descriptor, SQL_ERROR );
		}

		/*
		 * is it a char arg...
		 */

		switch ( field_identifier )
		{
			case SQL_DESC_NAME:		/* This is the only R/W SQLCHAR* type */
        		ascii_str = (SQLCHAR*) unicode_to_ansi_alloc( value, buffer_length, descriptor -> connection, NULL );
				value = ascii_str;
				buffer_length = strlen((char*) ascii_str );
				break;

			default:
				break;
		}

    	ret = SQLSETDESCFIELD( descriptor -> connection,
            	descriptor -> driver_desc,
            	rec_number, 
            	field_identifier,
            	value, 
            	buffer_length );
	
    	if ( log_info.log_flag )
    	{
        	sprintf( descriptor -> msg, 
                	"\n\t\tExit:[%s]",
                    	__get_return_status( ret, s1 ));
	
        	dm_log_write( __FILE__, 
                	__LINE__, 
                	LOG_INFO, 
                	LOG_INFO, 
                	descriptor -> msg );
    	}

		if ( ascii_str ) 
		{
			free( ascii_str );
		}
	}

    return function_return( SQL_HANDLE_DESC, descriptor, ret );
}