c - strcpy出现问题

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                                6年前关闭。
            
                    
我对C感到很糟糕，对strcpy遇到了麻烦。我正在尝试获取函数参数之一并将其存储在char数组中。运行此命令时，出现分段错误，但不知道为什么。我究竟做错了什么？谢谢！

struct bb_state {
    FILE *logfile;
    char *rootdir;
};

struct bb_state *bb_data;
bb_data = malloc(sizeof(struct bb_state));
strcpy(bb_data->rootdir, argv[argc-2]);

最佳答案

您必须为char* rootdir分配内存。

例：

int len=strlen(argv[argc-2])+1;
bb_data->rootdir=malloc(len);

然后，您可以执行以下操作：

strcpy(bb_data->rootdir, argv[argc-2]);