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