mirror of
https://github.com/coreutils/coreutils.git
synced 2024-12-14 04:18:48 +08:00
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/* Convert file size to number of blocks on System V-like machines.
|
||
|
||
Copyright (C) 1990, 1997, 1998, 1999, 2004 Free Software Foundation, Inc.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2, or (at your option)
|
||
any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software Foundation,
|
||
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
||
/* Written by Brian L. Matthews, blm@6sceng.UUCP. */
|
||
|
||
#if HAVE_CONFIG_H
|
||
# include <config.h>
|
||
#endif
|
||
|
||
#include <sys/types.h>
|
||
|
||
#if HAVE_SYS_PARAM_H
|
||
# include <sys/param.h>
|
||
#endif
|
||
|
||
#if !HAVE_STRUCT_STAT_ST_BLOCKS && !defined _POSIX_SOURCE && defined BSIZE
|
||
|
||
# if HAVE_UNISTD_H
|
||
# include <unistd.h>
|
||
# endif
|
||
|
||
# ifndef NINDIR
|
||
|
||
# if defined (__DJGPP__)
|
||
typedef long daddr_t; /* for disk address */
|
||
# endif
|
||
|
||
/* Some SysV's, like Irix, seem to lack this. Hope it's correct. */
|
||
/* Number of inode pointers per indirect block. */
|
||
# define NINDIR (BSIZE / sizeof (daddr_t))
|
||
# endif /* !NINDIR */
|
||
|
||
/* Number of direct block addresses in an inode. */
|
||
# define NDIR 10
|
||
|
||
/* Return the number of 512-byte blocks in a file of SIZE bytes. */
|
||
|
||
off_t
|
||
st_blocks (off_t size)
|
||
{
|
||
off_t datablks = size / 512 + (size % 512 != 0);
|
||
off_t indrblks = 0;
|
||
|
||
if (datablks > NDIR)
|
||
{
|
||
indrblks = (datablks - NDIR - 1) / NINDIR + 1;
|
||
|
||
if (datablks > NDIR + NINDIR)
|
||
{
|
||
indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1;
|
||
|
||
if (datablks > NDIR + NINDIR + NINDIR * NINDIR)
|
||
indrblks++;
|
||
}
|
||
}
|
||
|
||
return datablks + indrblks;
|
||
}
|
||
#else
|
||
/* This declaration is solely to ensure that after preprocessing
|
||
this file is never empty. */
|
||
typedef int textutils_fileblocks_unused;
|
||
#endif
|