-int bf_readp (BFile bf, int no, void **bufp);
-int bf_newp (BFile bf, int no, void **bufp);
-int bf_touch (BFile bf, int no);
-void bf_flush_blocks (BFile bf, int no_to_flush);
-
-void *xmalloc_f (size_t size);
-#define xmalloc(x) xmalloc_f(x)
-
-extern char *prog;
-