我是否以错误的方式使用realloc?

时间:2015-05-24 06:57:40

标签: c linux memory realloc

这是我的程序的一部分,它与realloc()有关。我给数组myEdge一个初始大小my_edge_num,当这个大小不够时,realloc()会有更多的空间。但是,即使新的realloc temp_edge不是NULL,当它到达数组中超出旧大小但小于新大小的位置时,仍会在下一步中显示EXC_BAD_ACCESS

string_first = strtok_r(buffer, " \t\n", &save_ptr);
int i=0;

int temp_edge_num;
Edge *temp_edge;
while (string_first != NULL)
 {
    temp_first = atoi(string_first);

    string_second = strtok_r(NULL," \t\n",&save_ptr);

    temp_second = atoi(string_second);



    if(i>=my_edge_num)// if it finds that it reaches original size
    {
        temp_edge_num = i + EDGE_NUM_ADJUST;//add more size

        temp_edge = (Edge *)realloc(myEdge, temp_edge_num);//allocate more space
        if(temp_edge)// if allocate more space successfully 
        {
            myEdge = temp_edge;// let original = new one
        }
        my_edge_num = temp_edge_num;

    }

    if((p_id[temp_first]==partitionID)||(p_id[temp_second]==partitionID))
    {
        myEdge[i].first=temp_first; //it says EXC_BAD_ACCESS here
        myEdge[i].second=temp_second;
    }



    i++;



    string_first = strtok_r(NULL, " \t\n", &save_ptr);

}

1 个答案:

答案 0 :(得分:3)

您重新分配的字节太少了。

应该是

temp_edge = realloc(myEdge, temp_edge_num*sizeof(Edge));//allocate more space

代替。