extern char* xstrdup(const char* s);
extern void* xmalloc(size_t size);
extern void packed_to_token(long, char token[]);
extern long token_to_packed(const char token[6]);
extern void tokenize(char*, long tokens[4]);
extern char* xstrdup(const char* s);
extern void* xmalloc(size_t size);
extern void packed_to_token(long, char token[]);
extern long token_to_packed(const char token[6]);
extern void tokenize(char*, long tokens[4]);