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81 lines
2.2 KiB
81 lines
2.2 KiB
/**
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* \file
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* My implementation of a ringbuffer.
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* It maps a shared memory object twice directly following
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* thus make it possible to read and write from any
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* position within the buffer without the nasty wrap
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* calculations.
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* This is achived because the same memory region is mapped
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* at the two addresses.
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*
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* \author Georg Hopp
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*
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* \copyright
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* Copyright © 2014 Georg Hopp
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __TR_CBUF_H__
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#define __TR_CBUF_H__
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#include <ctype.h>
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#include <string.h>
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#include <sys/types.h>
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#include "trbase.h"
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#include "trio.h"
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#define TR_ECBUFOVFL 100
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TR_CLASS(TR_Cbuf) {
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char * shm_name; // shared memory identifier
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char * data;
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Bool lock;
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size_t bsize;
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size_t bused;
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size_t write;
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size_t read;
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};
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TR_INSTANCE_INIT(TR_Cbuf);
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TR_CLASSVARS_DECL(TR_Cbuf) {};
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ssize_t TR_cbufRead(TR_Cbuf, TR_Stream);
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ssize_t TR_cbufWrite(TR_Cbuf, TR_Stream);
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char * TR_cbufGetLine(TR_Cbuf, char **);
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char * TR_cbufGetData(TR_Cbuf, size_t);
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char * TR_cbufSetData(TR_Cbuf, const void *, size_t);
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void TR_cbufEmpty(TR_Cbuf);
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char * TR_cbufGetRead(TR_Cbuf this);
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char * TR_cbufGetWrite(TR_Cbuf this);
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char * TR_cbufMemchr(TR_Cbuf this, int c);
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size_t TR_cbufAddrIndex(TR_Cbuf this, const void * c);
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void TR_cbufIncRead(TR_Cbuf this, size_t n);
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void TR_cbufIncWrite(TR_Cbuf this, size_t n);
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size_t TR_cbufGetFree(TR_Cbuf this);
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char TR_cbufIsEmpty(TR_Cbuf this);
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void TR_cbufSkipNonAlpha(TR_Cbuf this);
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Bool TR_cbufIsLocked(TR_Cbuf this);
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void TR_cbufLock(TR_Cbuf this);
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void TR_cbufRelease(TR_Cbuf this);
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#endif // __TR_CBUF_H__
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// vim: set ts=4 sw=4:
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