C 环形缓存区

来源：互联网发布：Ping用什么端口编辑：程序博客网时间：2024/05/12 23:18

直接上代码

#pragma once#ifndef QLIST_H_#define QLIST_H_void commInit();void commDataIn(int * pData, int len);int commGetDataLen();int commGetData(int *pRevcBuff, int len);#endif

#include "stdafx.h"#include "Qlist.h"/****************************************************************  COMM_BUFF_MAX  设置缓存区大小 *  void commDataIn(int * pData, int len); 存入数据(存入指针数组,长度)*  int commGetDataLen();  获取当前环形缓存区长度*  int commGetData(int *pRevcBuff, int len); 获取数据(获取后返回的指针数组,要获取长度). 返回值:成功:返回长度; 失败:-1 (超过缓存内的数据)****************************************************************/#define COMM_BUFF_MAX 128int comm_bufferRecv[COMM_BUFF_MAX];int comm_bufferNextWritePos=0;int comm_bufferNextReadPos=0;int comm_bufferDataCount=0;//传入数据void commDataIn(int * pData, int len){for (int i = 0; i < len; i++){if (comm_bufferDataCount < COMM_BUFF_MAX){comm_bufferRecv[comm_bufferNextWritePos++] = pData[i];comm_bufferDataCount++;if (comm_bufferNextWritePos >= COMM_BUFF_MAX){comm_bufferNextWritePos = 0;}}}}int commGetDataLen(){return comm_bufferDataCount;}int commGetData(int *pRevcBuff, int len){int i;if (len <= comm_bufferDataCount){for (i = 0; i<len; i++){pRevcBuff[i] = comm_bufferRecv[comm_bufferNextReadPos++];comm_bufferDataCount--;if (comm_bufferNextReadPos >= COMM_BUFF_MAX){comm_bufferNextReadPos = 0;}}return len;}else{return -1; //超出长度}}

使用方式:

commDataIn(buf, n);  //存入数据int len = commGetData(buf, n);  //取出数据

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