eonix/include/types/buffer.h

#pragma once

#include "stdint.h"

#define MAKE_RING_BUFFER(BUF_PTR, SIZE)        \
    {                                          \
        .buf_start_pos = (BUF_PTR),            \
        .buf_end_pos = ((BUF_PTR) + (SIZE)-1), \
        .base = (BUF_PTR),                     \
        .head = (BUF_PTR),                     \
        .count = 0,                            \
    }

struct ring_buffer {
    char* const buf_start_pos;
    char* const buf_end_pos;
    char* base;
    char* head;
    size_t count;
};

int32_t
ring_buffer_empty(struct ring_buffer* buf);

int32_t
ring_buffer_full(struct ring_buffer* buf);

char ring_buffer_read(struct ring_buffer* buf);

int32_t
ring_buffer_write(struct ring_buffer* buf, char c);