void bseek(struct fastbuf *f, sh_off_t pos, int whence);
void bsetpos(struct fastbuf *f, sh_off_t pos);
void brewind(struct fastbuf *f);
-void bskip(struct fastbuf *f, uns len);
+int bskip(struct fastbuf *f, uns len);
sh_off_t bfilesize(struct fastbuf *f);
static inline sh_off_t btell(struct fastbuf *f)