/*++

Copyright (c) 2005-2006  E0 Technology,Inc.

Module Name:

	buf.c

Abstract:

	Virtual Com Port Driver for USB to RS232 Converter of E0 Technology,Inc.

Environment:

	Kernel mode

Notes:

Revision History:

    2006/3/1 : 	Adapted from the reactos serial driver circularbuffer.c.
--*/

/*
 * COPYRIGHT:       See COPYING in the top level directory
 * PROJECT:         Serial port driver
 * FILE:            drivers/dd/serial/circularbuffer.c
 * PURPOSE:         Operations on a circular buffer
 *
 * PROGRAMMERS:     Herv