text: /*
   * unused.c --- quick and dirty unused space dumper
   *
   * Copyright (C) 1997 Theodore Ts'o.  This file may be redistributed
   * under the terms of the GNU Public License.
   */
  
  #include <stdio.h>
  #include <unistd.h>
  #include <stdlib.h>
  #include <ctype.h>
  #include <string.h>
  #include <time.h>
  #ifdef HAVE_ERRNO_H
  #include <errno.h>
  #endif
  #include <sys/types.h>
  #ifdef HAVE_GETOPT_H
  #include <getopt.h>
  #else
  extern int optind;
  extern char *optarg;
  #endif
  
  #include "debugfs.h"
  
  void do_dump_unused(int argc EXT2FS_ATTR((unused)), char **argv)
  {
  	blk64_t		blk;
  	unsigned char	buf[EXT2_MAX_BLOCK_SIZE];
  	unsigned int	i;
  	errcode_t	retval;
  
  	if (common_args_process(argc, argv, 1, 1,
  				"dump_unused", "", 0))
  		return;
  
  	for (blk=current_fs->super->s_first_data_block;
  	     blk < ext2fs_blocks_count(current_fs->super); blk++) {
  		if (ext2fs_test_block_bitmap2(current_fs->block_map,blk))
  			continue;
  		retval = io_channel_read_blk64(current_fs->io, blk, 1, buf);
  		if (retval) {
  			com_err(argv[0], retval, "While reading block\n");
  			return;
  		}
  		for (i=0; i < current_fs->blocksize; i++)
  			if (buf[i])
  				break;
  		if (i >= current_fs->blocksize)
  			continue;
  		printf("\nUnused block %llu contains non-zero data:\n\n",
  		       blk);
  		for (i=0; i < current_fs->blocksize; i++)
  			fputc(buf[i], stdout);
  	}
  }
  