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54 lines
1.2 KiB
54 lines
1.2 KiB
/**
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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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#ifndef __RINGBUFFER_H__
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#define __RINGBUFFER_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 "class.h"
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#define ECBUFOVFL 100
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CLASS(Cbuf) {
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char * shm_name; // shared memory identifier
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char * data;
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char * mirror;
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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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ssize_t cbufRead(Cbuf, int fd);
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ssize_t cbufWrite(Cbuf, int fd);
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char * cbufGetLine(Cbuf);
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char * cbufGetData(Cbuf, size_t);
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char * cbufSetData(Cbuf, const void *, size_t);
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char * cbufGetRead(Cbuf this);
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char * cbufGetWrite(Cbuf this);
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char * cbufMemchr(Cbuf this, int c);
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size_t cbufAddrIndex(Cbuf this, const void * c);
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void cbufIncRead(Cbuf this, size_t n);
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void cbufIncWrite(Cbuf this, size_t n);
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size_t cbufGetFree(Cbuf this);
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char cbufIsEmpty(Cbuf this);
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void cbufSkipNonAlpha(Cbuf this);
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#endif // __RINGBUFFER_H__
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// vim: set ts=4 sw=4:
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