strtok（）在此代码中没有出现分段错误。为什么？

Question

int main(int argc, char *arv[])
{
   printf("Enter sequence of numbers seperated by comma\n");
   char input[200];
   char *valueStr = NULL;
   int total = 0;
   int values[100];
   int ctr = 0, i = 0;
   if (fgets(input, sizeof(input), stdin) != NULL)
   {  // split using comma 
      printf("printing %s", input);
      valueStr = strtok(input, ",");
      printf("printing %s", valueStr);
      while (valueStr != NULL && sscanf(valueStr, "%d", values[ctr++]) != EOF);
      {
         printf("Got value %d\n", values[ctr - 1]);
         valueStr = strtok(NULL, ",");
      }
      for (i = 0; i < ctr; i++)
         total +=values[i];
      if (total == 0)
         printf("Equals to 0\n");
      else
         printf("Doesn't equal to 0\n");
   }
}

对我来说似乎很简单......我做错了什么？目前输出如下：

bash-4.2$ ./subset 
Enter sequence of numbers seperated by comma
-5,-3,-1,2,4,6
printing -5,-3,-1,2,4,6
Segmentation fault (core dumped)

它永远不会被传递给strtok（），我不明白为什么......我没有将字符串文字传递给函数！