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https://gitee.com/moluo-tech/AT-Command
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90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
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/******************************************************************************
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* @brief <EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(<EFBFBD>ο<EFBFBD>linux/kfifo)
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*
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* Copyright (c) 2016~2020, <morro_luo@163.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2016-05-30 Morro <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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******************************************************************************/
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#include "ringbuffer.h"
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#include <string.h>
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#include <stddef.h>
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#define min(a,b) ( (a) < (b) )? (a):(b)
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/*
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*@brief <EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@param[in] r - <EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@param[in] buf - <EFBFBD><EFBFBD><EFBFBD>ݻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@param[in] len - buf<EFBFBD><EFBFBD><EFBFBD><EFBFBD>(<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>2<EFBFBD><EFBFBD>N<EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
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*@retval bool
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*/
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bool ring_buf_init(ring_buf_t *r,unsigned char *buf, unsigned int len)
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{
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r->buf = buf;
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r->size = len;
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r->front = r->rear = 0;
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return buf != NULL && (len & len -1) == 0;
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}
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/*
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*@brief <EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@param[in] r - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>յĻ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@retval none
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*/
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void ring_buf_clr(ring_buf_t *r)
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{
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r->front = r->rear = 0;
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}
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/*
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*@brief <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݳ<EFBFBD><EFBFBD><EFBFBD>
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*@retval <EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ч<EFBFBD>ֽ<EFBFBD><EFBFBD><EFBFBD>
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*/
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unsigned int ring_buf_len(ring_buf_t *r)
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{
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return r->rear - r->front;
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}
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/*
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*@brief <EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݷŵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@param[in] buf - <EFBFBD><EFBFBD><EFBFBD>ݻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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* len - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@retval ʵ<EFBFBD>ʷŵ<EFBFBD><EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*/
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unsigned int ring_buf_put(ring_buf_t *r,unsigned char *buf,unsigned int len)
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{
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unsigned int i;
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unsigned int left;
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left = r->size + r->front - r->rear;
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len = min(len , left);
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i = min(len, r->size - (r->rear & r->size - 1));
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memcpy(r->buf + (r->rear & r->size - 1), buf, i);
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memcpy(r->buf, buf + i, len - i);
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r->rear += len;
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return len;
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}
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/*
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*@brief <EFBFBD>ӻ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>ȡָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@param[in] len - <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@param[out] buf - <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*@retval ʵ<EFBFBD>ʶ<EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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*/
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unsigned int ring_buf_get(ring_buf_t *r,unsigned char *buf,unsigned int len)
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{
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unsigned int i;
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unsigned int left;
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left = r->rear - r->front;
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len = min(len , left);
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i = min(len, r->size - (r->front & r->size - 1));
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memcpy(buf, r->buf + (r->front & r->size - 1), i);
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memcpy(buf + i, r->buf, len - i);
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r->front += len;
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return len;
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}
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