1/* Convert file size to number of blocks on System V-like machines.
2
3   Copyright (C) 1990, 1997, 1998, 1999, 2004, 2005, 2006 Free Software
4   Foundation, Inc.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software Foundation,
18   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
19
20/* Written by Brian L. Matthews, blm@6sceng.UUCP. */
21
22#include <config.h>
23
24#include <sys/types.h>
25
26#if HAVE_SYS_PARAM_H
27# include <sys/param.h>
28#endif
29
30#if !HAVE_STRUCT_STAT_ST_BLOCKS && !defined _POSIX_SOURCE && defined BSIZE
31
32# include <unistd.h>
33
34# ifndef NINDIR
35
36#  if defined __DJGPP__
37typedef long daddr_t; /* for disk address */
38#  endif
39
40/* Some SysV's, like Irix, seem to lack this.  Hope it's correct. */
41/* Number of inode pointers per indirect block. */
42#  define NINDIR (BSIZE / sizeof (daddr_t))
43# endif /* !NINDIR */
44
45/* Number of direct block addresses in an inode. */
46# define NDIR	10
47
48/* Return the number of 512-byte blocks in a file of SIZE bytes. */
49
50off_t
51st_blocks (off_t size)
52{
53  off_t datablks = size / 512 + (size % 512 != 0);
54  off_t indrblks = 0;
55
56  if (datablks > NDIR)
57    {
58      indrblks = (datablks - NDIR - 1) / NINDIR + 1;
59
60      if (datablks > NDIR + NINDIR)
61	{
62	  indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1;
63
64	  if (datablks > NDIR + NINDIR + NINDIR * NINDIR)
65	    indrblks++;
66	}
67    }
68
69  return datablks + indrblks;
70}
71#else
72/* This declaration is solely to ensure that after preprocessing
73   this file is never empty.  */
74typedef int textutils_fileblocks_unused;
75#endif
76