你如何声明循环缓冲区？

Question

/**
 * ring_buffer_set - update the ring buffer with the given value
 * @lq_recv: pointer to the ring buffer
 * @lq_index: index to store the value at
 * @value: value to store in the ring buffer
 */
static void ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
                   uint8_t value)
{
    lq_recv[*lq_index] = value;
    *lq_index = (*lq_index + 1) % 64;
}

/**
 * ring_buffer_set - compute the average of all non-zero values stored
 * in the given ring buffer
 * @lq_recv: pointer to the ring buffer
 *
 * Returns computed average value.
 */
static uint8_t ring_buffer_avg(const uint8_t lq_recv[])
{
    const uint8_t *ptr;
    uint16_t count = 0, i = 0, sum = 0;

    ptr = lq_recv;

    while (i < 64) {
        if (*ptr != 0) {
            count++;
            sum += *ptr;
        }

        i++;
        ptr++;
    }

    if (count == 0)
        return 0;

    return (uint8_t)(sum / count);
}

1)lq_recv[]是循环缓冲区,但它看起来像一个普通的数组？

2)目的是*lq_index = (*lq_index + 1) % 64什么？

Answer 1

1. "循环缓冲区"是以特定方式使用的数组.它没有与任何其他数组声明任何不同.

2. 它正在更新从中读取的数组的索引并将其保持在数组的范围内.