Experiment with generic ring buffer using preprocessor

RingBuff.h

#ifndef _RING_BUFFER_H_
#define _RING_BUFFER_H_

#include <stdint.h>

#define RING_BUFFER_MAX_SIZE 255

#define INIT_RING_BUFFER(_NAME,_SIZE,_DATATYPE,NULLTYPE)\
typedef struct _NAME ##  _s_ring_buffer _NAME ##  _s_ring_buffer;\
typedef struct _NAME ##  _s_ring_buffer\
{\
    _DATATYPE  buffer[RING_BUFFER_MAX_SIZE];\
    uint32_t size;\
    uint32_t tail;\
    uint32_t head;\
};\
typedef _NAME ##  _s_ring_buffer _NAME ##  _t_ring_buffer;\
_NAME ##  _t_ring_buffer _NAME= {.size = _SIZE % RING_BUFFER_MAX_SIZE}; \
void _NAME ##  _put_char(_DATATYPE c, _NAME ##  _t_ring_buffer *rb)\
{\
    rb->buffer[rb->head] = c;\
    if(rb->head < rb->tail && rb->tail - rb->head == 1)\
    {\
        rb->tail++;\
        rb->tail = rb->tail % rb->size;\
    }\
    rb->head++;\
    rb->head = rb->head % rb->size;\
}\
uint16_t _NAME ##  _get_length(_NAME ##  _t_ring_buffer *rb)\
{\
    if(rb->head < rb->tail)\
    {\
        return rb->head + (rb->size - rb->tail);\
    }\
    else\
    {\
        return rb->head - rb->tail;\
    }\
}\
_DATATYPE _NAME ##  _read_char(_NAME ##  _t_ring_buffer *rb)\
{\
    if(rb->tail != rb->head)\
    {\
        _DATATYPE ret_char = rb->buffer[rb->tail];\
        rb->tail++;\
        rb->tail = rb->tail % rb->size;\
        return ret_char;\
    }\
    return NULLTYPE;\
}

#endif // _RING_BUFFER_H_