1*4882a593Smuzhiyun /****************************************************************************** 2*4882a593Smuzhiyun * 3*4882a593Smuzhiyun * Copyright(c) 2007 - 2019 Realtek Corporation. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * This program is free software; you can redistribute it and/or modify it 6*4882a593Smuzhiyun * under the terms of version 2 of the GNU General Public License as 7*4882a593Smuzhiyun * published by the Free Software Foundation. 8*4882a593Smuzhiyun * 9*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful, but WITHOUT 10*4882a593Smuzhiyun * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11*4882a593Smuzhiyun * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12*4882a593Smuzhiyun * more details. 13*4882a593Smuzhiyun * 14*4882a593Smuzhiyun *****************************************************************************/ 15*4882a593Smuzhiyun #ifndef __CIRC_BUF_H_ 16*4882a593Smuzhiyun #define __CIRC_BUF_H_ 1 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun #define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1)) 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size)) 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #endif //_CIRC_BUF_H_ 23*4882a593Smuzhiyun 24