Question

linux下运行c程序报段错误

int createList(FILE *fp, struct Road **roadlist)
{
long nodeNum = 0;
struct Road *Head, *CurNode, *NexNode;
unsigned short int roadSize = 0, roadNameSize = 0;
unsigned long roadLinkID = 0, roadInfo = 0;
unsigned char roadInfoBuff[50];
Head = NULL;
CurNode = NULL;
NexNode = NULL;
Head = malloc(sizeof(struct Road));
NexNode = Head;
while (1)
{
CurNode = malloc(sizeof(struct Road));

fread(&roadSize, sizeof(short int), 1, fp);
roadSize = M_CHG_INT16(roadSize);
CurNode->one_Road.RoadSize = roadSize;

fread(&roadLinkID, sizeof(long), 1, fp);
roadLinkID = M_CHG_INT32(roadLinkID);
CurNode->one_Road.RoadLinkID = roadLinkID;

fread(&roadNameSize, sizeof(short int), 1, fp);
roadNameSize = M_CHG_INT16(roadNameSize);
CurNode->one_Road.RoadNameSize = roadNameSize;

fread(&roadInfo, sizeof(long), 1, fp);
roadInfo = M_CHG_INT32(roadInfo);
CurNode->one_Road.RoadStaNodeInfo = roadInfo;

if (feof(fp))
break;

if (1 == GET_FLAG(roadInfo))
{
CurNode->one_Road.RoadName = malloc(roadNameSize + 2);
fread(roadInfoBuff, roadNameSize + 2, 1, fp);
strcpy(CurNode->one_Road.RoadName, roadInfoBuff);
}
else
{
CurNode->one_Road.RoadName = malloc(sizeof("暂无名称"));
strcpy(CurNode->one_Road.RoadName, "暂无名称");
}
CurNode->nextRoadNode = NULL;
NexNode->nextRoadNode = CurNode;
NexNode = CurNode;
nodeNum++;
}
*roadlist = Head;
return nodeNum;
}
就是这个函数运行时，在windows下能正常运行，拿到linux下时就报错了

Answer 1

我没看完，就看了几行，这里就有错误
CurNode = malloc(sizeof(struct Road));

fread(&roadSize, sizeof(short int), 1, fp);
roadSize = M_CHG_INT16(roadSize);
CurNode->one_Road.RoadSize = roadSize;
这里 CurNode 是刚刚申请的吧， CurNode->one_Road 这个指针指向谁？我没看见你给这个指针赋值或者是分配空间

如果还有错误的话你还可以再追问

追问

定义的两个结构体是这样的，第一个存储道路信息类似与Node,第二个用于链表类似于Link

追答

看起来没什么问题啊，你确定就是这个函数吗？
内村访问越界不一定就是立刻 segment fault 的