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circular-buffer.h
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circular-buffer.h
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/* Copyright 2015 Outscale SAS
*
* This file is part of Butterfly.
*
* Butterfly is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as published
* by the Free Software Foundation.
*
* Butterfly 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.
*
* You should have received a copy of the GNU General Public License
* along with Butterfly. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _CIRCULAR_BUFFER_H_
#define _CIRCULAR_BUFFER_H_
#define REGISTER_CB(name, type, size) \
struct name { \
type buff[size]; \
unsigned int start; \
unsigned int buff_size; \
}; \
static const unsigned int name##_size = size; \
static const unsigned int name##_type_size = sizeof(type);
#define cb_init(cb, name) do { \
(cb).start = 0; \
(cb).buff_size = name##_size ; \
} while (0)
#define cb_init0(cb, name) do { \
cb_init((cb), name); \
memset((cb).buff, 0, name##_type_size * name##_size); \
} while (0)
#define cb_get(cb, i) ((cb).buff[((cb).start + (i)) % (cb).buff_size])
#define cb_set_start(cb, i) ((cb).start = (i))
#define cb_start_incr(cb) ((cb).start += 1)
#define cb_set(cb, i, val) (cb_get((cb), (i)) = val)
#endif