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/*
* BIRD Library -- Generic Buffer Structure
*
* (c) 2013 Ondrej Zajicek <santiago@crfreenet.org>
* (c) 2013 CZ.NIC z.s.p.o.
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_BUFFER_H_
#define _BIRD_BUFFER_H_
#include "lib/resource.h"
#include "sysdep/config.h"
#define BUFFER_(type) struct { type *data; uint used, size; }
#define BUFFER_TYPE(v) typeof(* (v).data)
#define BUFFER_SIZE(v) ((v).size * sizeof(* (v).data))
#ifndef PARSER
#define BUFFER(type) BUFFER_(type)
#endif
#define BUFFER_INIT(v,pool,isize) \
({ \
(v).used = 0; \
(v).size = (isize); \
(v).data = mb_alloc(pool, BUFFER_SIZE(v)); \
})
#define BUFFER_SET(v,nsize) \
({ \
(v).used = (nsize); \
if ((v).used > (v).size) \
buffer_realloc((void **) &((v).data), &((v).size), (v).used, sizeof(* (v).data)); \
})
#define BUFFER_INC(v,step) \
({ \
uint _o = (v).used; \
BUFFER_SET(v, (v).used + (step)); \
(v).data + _o; \
})
#define BUFFER_DEC(v,step) ({ (v).used -= (step); })
#define BUFFER_PUSH(v) (*BUFFER_INC(v,1))
#define BUFFER_POP(v) BUFFER_DEC(v,1)
#define BUFFER_FLUSH(v) ({ (v).used = 0; })
#define BUFFER_EMPTY(v) ({ (v).used == 0; })
#define BUFFER_WALK(v,n) \
for (BUFFER_TYPE(v) *_n = (v).data, n; _n < ((v).data + (v).used) && (n = *_n, 1); _n++)
#define BUFFER_SHALLOW_COPY(dst, src) \
({ \
(dst).used = (src).used; \
(dst).size = (src).size; \
(dst).data = (src).data; \
})
#endif /* _BIRD_BUFFER_H_ */
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