ref: f3f7c15067fcc8db0b673df47a9bc7caccaad525
dir: /util.h/
typedef struct List List; struct List { void *data; List *next; }; typedef struct { int len; List *head; List *tail; }Quene; int isnum(char *s, unsigned int n); int strtodir(char *s); char* dirtostr(int dir); Point parseput(char *x, char *y); int dprint(char *fmt, ...); void* emalloc(unsigned long n); /* ll */ int lladd(List *tail, void *data); List* llnew(void); void llappend(List *first, void *data); void* lookup(List *l, int n); /* quene */ void qadd(Quene *q, void *data); void qnext(Quene *q);