ref: 917cac8aba2b5e8d6ef5e5c182445d3700ede55d 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);