ref: 0281fe456e9e2ef7c3f8829b139f453f3e0aa159 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);