c - 段错误。为结构体中的结构体分配内存

Question

好吧，对于我正在开发的视频游戏的结构，我需要在结构“地牢”内分配结构“房间”。不幸的是，我似乎无法分配足够的内存来放置我需要的所有信息。这是我的数据结构的示例:

typedef struct monster {
    int difficulty;
    char *name;
    char *type;
    int hp;
} monster;

typedef struct rooms {
    int n_monsters;
    int visited;
    struct rooms *nentry;
    struct rooms *sentry;
    struct rooms *wentry;
    struct rooms *eentry;
    monster *monsters;
} rooms;

typedef struct dungeon {
    char *name;
    int n_rooms;
    rooms *rm; // Subject to change
    rooms sroom;
} dungeon;

这就是我遇到段错误的地方。

d->name = "Dungeon 1";
d->n_rooms = 10;
rooms *room = malloc(d->n_rooms * sizeof(rooms));

// Room 0
room[0].n_monsters = 1;
room[0].visited = 0;
*room[0].sentry = room[1]; // xCode is showing the seg-fault here

// Room 2
room[1].n_monsters = 1;
room[1].visited = 0;
*room[1].nentry = room[0];

d->rm = room;

为什么我会出现段错误？我分配了足够的内存吗？

Answer 1

您没有为room[0].sentry分配内存。尝试:

room[0].sentry = malloc(sizeof *room[0].sentry);
*room[0].sentry = ...

或者，您可以只分配指针(我认为在您的情况下效果会更好):

room[0].sentry = &room[1];