#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char **argv)
{
        char *name="17008.1000.32.34.01.11";
        char operator[32] = {0};
        char str_out[64] = {0};
        unsigned long long i = 0;
        for(i=0;i<1000000000;i++)
        {   
                //memcpy(operator, name+11, 2);
                snprintf(operator,2,"%s",name+11);
        }   
        printf("name:%s,operator:%s\n",name,operator);
        printf("atoi=%d\n",atoi(operator));
        switch(atoi(operator))
        {   
                case 00: 
                        snprintf(str_out, sizeof(str_out), "L718-CN-00");
                        break;
                case 32: 
                        snprintf(str_out, sizeof(str_out), "L718-CN-01");
                        break;
                case 31: 
                        snprintf(str_out, sizeof(str_out), "L718-CN-02");
                        break;
                case 33: 
                        snprintf(str_out, sizeof(str_out), "L718-CN-06");
                        break;
        }   
        printf("%s\n",str_out);

        //printf("we use memcpy\n");
        printf("we use snprintf\n");
        return 0;
}
 

用虛擬機器分別執行程式，統計時間，發現memcpy的效率比snprintf高很多