queue.h

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#pragma once

#include "defs.h"

#define WIO_QUEUE_AT(queue, type, index) \
    ((type*)(queue->data+index*queue->item_size))
#define WIO_QUEUE_BEGIN(queue, type) \
    WIO_QUEUE_AT(queue, type, ((queue->begin==0)?(queue->capacity-1):(queue->begin-1)))
#define WIO_QUEUE_END(queue, type) \
    WIO_QUEUE_AT(queue, type, queue->end)

typedef struct wio_queue {
    uint16_t size;
    uint16_t capacity;
    uint16_t item_size;

    uint8_t* data;

    uint16_t begin;
    uint16_t end;
} wio_queue_t;

wio_status_t wio_queue_init(
    wio_queue_t* self,
    uint16_t item_size,
    uint16_t capacity
);

wio_status_t wio_queue_fini(
    wio_queue_t* self
);

wio_status_t wio_queue_push(
    wio_queue_t* self,
    const void* item
);

wio_status_t wio_queue_pop(
    wio_queue_t* self,
    void* _item
);