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