ref: 622bc9129b7a0e80c97b4f4298a56b4d3f0bbf48 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);