void ds_put_hex_dump(struct ds *ds, const void *buf_, size_t size,
uintptr_t ofs, bool ascii);
int ds_get_line(struct ds *, FILE *);
void ds_put_hex_dump(struct ds *ds, const void *buf_, size_t size,
uintptr_t ofs, bool ascii);
int ds_get_line(struct ds *, FILE *);