-CFile cf_open (MFile mf, const char *fname, int block_size, int wflag,
- int *firstp);
-int cf_read (CFile cf, int no, int offset, int num, void *buf);
-int cf_write (CFile cf, int no, int offset, int num, const void *buf);
+CFile cf_open (MFile mf, MFile_area area, const char *fname, int block_size,
+ int wflag, int *firstp);
+int cf_read (CFile cf, int no, int offset, int nbytes, void *buf);
+int cf_write (CFile cf, int no, int offset, int nbytes, const void *buf);
+void cf_unlink (CFile cf);