1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /****************************************************************************** 3 * 4 * Copyright(c) 2007 - 2017 Realtek Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of version 2 of the GNU General Public License as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 *****************************************************************************/ 16 #ifndef __CIRC_BUF_H_ 17 #define __CIRC_BUF_H_ 1 18 19 #define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1)) 20 21 #define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size)) 22 23 #endif //_CIRC_BUF_H_ 24 25