cbuf.h

/* 
 cbuf.h - Circular buffer implementation
 Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
 This file is part of the esp8266 core for Arduino environment.
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 This library 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
 Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef __cbuf_h
#define __cbuf_h

#include <stddef.h>
#include <stdint.h>
#include <string.h>

class cbuf {
    public:
        cbuf(size_t size);
        ~cbuf();
        size_t getSize() const;
        size_t room() const ;
        bool empty() const ;
        bool full() const ;
        int peek() ;
        int read();
        size_t read(char* dst, size_t size);
        size_t write(char c);
        size_t write(const char* src, size_t size);
        void flush();

    private:
        const size_t _size;
        char* _buf;
        const char* const _bufend;
        char* _begin;
        char* _end;

        char* wrap_if_bufend(char* ptr) const ;
};

#endif//__cbuf_h