29 lines
1.1 KiB
C
29 lines
1.1 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2007 - 2011 Realtek Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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*
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*
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******************************************************************************/
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#ifndef __CIRC_BUF_H_
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#define __CIRC_BUF_H_ 1
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#define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1))
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#define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size))
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#endif //_CIRC_BUF_H_
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