+extern void bb_dump_add(const char *fmt);
+extern int bb_dump_dump (char **argv);
+extern int bb_dump_size(FS * fs);
+
+extern FS *bb_dump_fshead; /* head of format strings */
+extern int bb_dump_blocksize; /* data block size */
+extern int bb_dump_length; /* max bytes to read */
+extern enum _vflag bb_dump_vflag;
+extern off_t bb_dump_skip; /* bytes to skip */