ring_buffer.h

#ifndef _RING_BUFFER_H
#define _RING_BUFFER_H

#define RING_BUFFER_NEW(struct_name, size, type, ...)   \
        struct struct_name {    \
                type queue[size];       \
                uint8_t start;                  \
                uint8_t end;                    \
                uint8_t buffer_size;                    \
        } __VA_ARGS__


#define RING_BUFFER_INIT(buf, size)                     \
        do {                                                                            \
                (buf).buffer_size = size;                               \
        } while(0)


#define RING_BUFFER_CLEAR(buf)  \
        do {                                            \
                (buf).start = 0;                \
                (buf).end = 0;                  \
        } while (0)

#define RING_BUFFER_EMPTY(buf) ((buf).start == (buf).end)


#define RING_BUFFER_FULL(buf)   \
                (((buf).end + 1) % (buf).buffer_size == (buf).start)


#define RING_BUFFER_ADD(buf, val)               \
        do {                                                            \
                (buf).queue[(buf).end] = val;   \
                (buf).end = ((buf).end + 1) % (buf).buffer_size;        \
        } while (0)


#define RING_BUFFER_REMOVE(buf, val_ret)        \
        do {    \
                (val_ret) = (buf).queue[(buf).start];   \
                (buf).start = ((buf).start + 1) % (buf).buffer_size;    \
        } while (0)

 #define RING_BUFFER_PEEK(buf, val_ret)  \
  do { \
    (val_ret) = (buf).queue[(buf).start]; \
  } while(0)

#endif /* _RING_BUFFER_H */

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