#ifndef RINGBUFFER_H
#define RINGBUFFER_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>

typedef struct {
  uint32_t head;
  uint32_t tail;
  uint32_t size;
  uint8_t data[];
} ringbuffer;

#define RINGBUFFER_STORAGE(NAME, SIZE) uint8_t buf_##NAME##__LINE__[sizeof(ringbuffer) + SIZE]; ringbuffer *NAME = (ringbuffer*)buf_##NAME##__LINE__;
#define RINGBUFFER_INIT(NAME, SIZE) NAME->head = NAME->tail = 0; NAME->size = SIZE;
#define RINGBUFFER(NAME, SIZE) \
  RINGBUFFER_STORAGE(NAME, SIZE); \
  RINGBUFFER_INIT(NAME, SIZE);

void ringbuffer_rst(ringbuffer *buf);

unsigned ringbuffer_capacity(ringbuffer *buf);
unsigned ringbuffer_free(ringbuffer *buf);
unsigned ringbuffer_level(ringbuffer *buf);

unsigned ringbuffer_empty(ringbuffer *buf);

unsigned ringbuffer_add(ringbuffer *buf, uint8_t *dat, unsigned len);

unsigned ringbuffer_get(ringbuffer *buf, uint8_t *dst, unsigned len);
unsigned ringbuffer_peek(ringbuffer *buf, uint8_t *dst, unsigned len);
void ringbuffer_skip(ringbuffer *buf, unsigned len);

#ifdef __cplusplus
}
#endif
#endif