ref: d4e2dd4c6f49c9c0e45a29e7bacdfb37d01b3d93 dir: /util.h/
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);