cbuf.h
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/**
* \file
* My implementation of a ringbuffer.
* It maps a shared memory object twice directly following
* thus make it possible to read and write from any
* position within the buffer without the nasty wrap
* calculations.
* This is achived because the same memory region is mapped
* at the two addresses.
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2012 Georg Hopp
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __CBUF_H__
#define __CBUF_H__
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include "class.h"
#include "stream.h"
#include "commons.h"
#define ECBUFOVFL 100
CLASS(Cbuf) {
char * shm_name; // shared memory identifier
char * data;
Bool lock;
size_t bsize;
size_t bused;
size_t write;
size_t read;
};
ssize_t cbufRead(Cbuf, Stream);
ssize_t cbufWrite(Cbuf, Stream);
char * cbufGetLine(Cbuf, char **);
char * cbufGetData(Cbuf, size_t);
char * cbufSetData(Cbuf, const void *, size_t);
void cbufEmpty(Cbuf);
char * cbufGetRead(Cbuf this);
char * cbufGetWrite(Cbuf this);
char * cbufMemchr(Cbuf this, int c);
size_t cbufAddrIndex(Cbuf this, const void * c);
void cbufIncRead(Cbuf this, size_t n);
void cbufIncWrite(Cbuf this, size_t n);
size_t cbufGetFree(Cbuf this);
char cbufIsEmpty(Cbuf this);
void cbufSkipNonAlpha(Cbuf this);
Bool cbufIsLocked(Cbuf this);
void cbufLock(Cbuf this);
void cbufRelease(Cbuf this);
#endif // __CBUF_H__
// vim: set ts=4 sw=4: