#include "ring_buffer.h"
#include "string.h"

void ring_buffer_init(struct ring_buffer *buffer, u32 el_size)
{
    buffer->start = 0;
    buffer->end = 0;
    buffer->element_size = el_size;
    buffer->size = 0;
}

void ring_buffer_push(struct ring_buffer *buffer, void *el)
{
    if (buffer->size >= RING_BUFFER_SIZE)
        return;

    char *dst = buffer->buffer + buffer->start;
    memcpy(dst, el, buffer->element_size);
    buffer->start = (buffer->start + buffer->element_size) % RING_BUFFER_SIZE;
    buffer->size += buffer->element_size;
}

void *ring_buffer_pop(struct ring_buffer *buffer)
{
    if (buffer->size == 0)
        return NULL;

    void *res = buffer->buffer + buffer->end;
    buffer->end = (buffer->end + buffer->element_size) % RING_BUFFER_SIZE;
    buffer->size -= buffer->element_size;

    return res;
}