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61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
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/* Convert file size to number of blocks on System V-like machines.
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Copyright (C) 1990 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Written by Brian L. Matthews, blm@6sceng.UUCP. */
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#if !defined (HAVE_ST_BLOCKS) && !defined(_POSIX_SOURCE)
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#include <sys/types.h>
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#include <sys/param.h>
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#ifndef NINDIR
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/* Some SysV's, like Irix, seem to lack these. Hope they're correct. */
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/* Size of a indirect block, in bytes. */
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#define BSIZE 1024
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/* Number of inode pointers per indirect block. */
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#define NINDIR (BSIZE/sizeof(daddr_t))
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#endif /* !NINDIR */
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/* Number of direct block addresses in an inode. */
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#define NDIR 10
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/* Return the number of 512-byte blocks in a file of SIZE bytes. */
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long
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st_blocks (size)
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long size;
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{
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long datablks = (size + 512 - 1) / 512;
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long indrblks = 0;
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if (datablks > NDIR)
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{
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indrblks = (datablks - NDIR - 1) / NINDIR + 1;
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if (datablks > NDIR + NINDIR)
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{
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indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1;
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if (datablks > NDIR + NINDIR + NINDIR * NINDIR)
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indrblks++;
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}
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}
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return datablks + indrblks;
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}
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#endif
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