从文件中读取，拆分结果并将它们放在C

Question

我收到的文件包含1,2;3,4;0,4;2,5之类的字符串。这些是由;分隔的键 - 值对。当我在下面的代码中运行时，我可以看到一切看起来都很好，我得到了正确的键值对，但是当我实际上尝试将它们插入到数组中时，我得到了分段错误。任何建议或建议如何解决这个问题将不胜感激。

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

int main(){


FILE *f = fopen("test.txt", "rb");
fseek(f, 0, SEEK_END);
int fsize = ftell(f);
fseek(f, 0, SEEK_SET);

int n[fsize+1];
char *string = malloc(fsize + 1);

fread(string, fsize, 1, f);
fclose(f);

int first;
int second;

char* first_split;

char *rest2;
char *rest;

while(first_split = strtok_r(string, ";", &rest))
{

        char * second_split = strtok_r(first_split, ",", &rest2);
        first_split = rest2;
        first = atol(second_split);
        second = atol(first_split);
        printf("n[%d]=%d " ,first, second);

    /* n['first']=second; */


        string = rest;
}

}