C语言字符串查找（gps的nmea协议解析）

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
#include <stdio.h>

int main(){
    char* str = "123,456,789,0123456,123456,0,09,10";
    char sub[3];
    int count = 0, index = 0;
    for (index = 0; index < strlen(str); ++index){
        if (str[index] == ‘,‘)
            ++count;
        if (count == 6)
            break;
    }
    strncpy(sub, &str[index+1], 2);

    sub[2] = ‘\0‘;
    printf(sub); //123,456,789

    int n = atoi(sub);
    printf("string = %s integer = %d\n", sub, n);

}