realtek-rtl8188eus-dkms/include/circ_buf.h

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2019-12-17 16:14:15 +00:00
/******************************************************************************
*
* Copyright(c) 2007 - 2017 Realtek Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*****************************************************************************/
#ifndef __CIRC_BUF_H_
#define __CIRC_BUF_H_ 1
#define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1))
#define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size))
#endif //_CIRC_BUF_H_