75 lines
2.0 KiB
C
75 lines
2.0 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, 1997-1999, 2004-2006, 2009-2020 Free Software
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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 3 of the License, or
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(at your option) 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, see <https://www.gnu.org/licenses/>. */
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/* Written by Brian L. Matthews, blm@6sceng.UUCP. */
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#include <config.h>
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#include <sys/types.h>
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#if HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#if !HAVE_STRUCT_STAT_ST_BLOCKS && !defined _POSIX_SOURCE && defined BSIZE
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# include <unistd.h>
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# ifndef NINDIR
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# if defined __DJGPP__
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typedef long daddr_t; /* for disk address */
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# endif
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/* Some SysV's, like Irix, seem to lack this. Hope it's correct. */
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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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off_t
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st_blocks (off_t size)
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{
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off_t datablks = size / 512 + (size % 512 != 0);
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off_t 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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#else
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/* This declaration is solely to ensure that after preprocessing
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this file is never empty. */
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typedef int textutils_fileblocks_unused;
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#endif
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