| 1 | /* Convert file size to number of blocks on System V-like machines.
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| 2 |
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| 3 | Copyright (C) 1990, 1997-1999, 2004-2006, 2009-2016 Free Software
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| 4 | Foundation, Inc.
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| 5 |
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| 6 | This program is free software: you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 18 |
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| 19 | /* Written by Brian L. Matthews, blm@6sceng.UUCP. */
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| 20 |
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| 21 | #include <config.h>
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| 22 |
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| 23 | #include <sys/types.h>
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| 24 |
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| 25 | #if HAVE_SYS_PARAM_H
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| 26 | # include <sys/param.h>
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| 27 | #endif
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| 28 |
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| 29 | #if !HAVE_STRUCT_STAT_ST_BLOCKS && !defined _POSIX_SOURCE && defined BSIZE
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| 30 |
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| 31 | # include <unistd.h>
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| 32 |
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| 33 | # ifndef NINDIR
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| 34 |
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| 35 | # if defined __DJGPP__
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| 36 | typedef long daddr_t; /* for disk address */
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| 37 | # endif
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| 38 |
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| 39 | /* Some SysV's, like Irix, seem to lack this. Hope it's correct. */
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| 40 | /* Number of inode pointers per indirect block. */
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| 41 | # define NINDIR (BSIZE / sizeof (daddr_t))
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| 42 | # endif /* !NINDIR */
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| 43 |
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| 44 | /* Number of direct block addresses in an inode. */
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| 45 | # define NDIR 10
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| 46 |
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| 47 | /* Return the number of 512-byte blocks in a file of SIZE bytes. */
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| 48 |
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| 49 | off_t
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| 50 | st_blocks (off_t size)
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| 51 | {
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| 52 | off_t datablks = size / 512 + (size % 512 != 0);
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| 53 | off_t indrblks = 0;
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| 54 |
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| 55 | if (datablks > NDIR)
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| 56 | {
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| 57 | indrblks = (datablks - NDIR - 1) / NINDIR + 1;
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| 58 |
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| 59 | if (datablks > NDIR + NINDIR)
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| 60 | {
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| 61 | indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1;
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| 62 |
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| 63 | if (datablks > NDIR + NINDIR + NINDIR * NINDIR)
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| 64 | indrblks++;
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| 65 | }
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| 66 | }
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| 67 |
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| 68 | return datablks + indrblks;
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| 69 | }
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| 70 | #else
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| 71 | /* This declaration is solely to ensure that after preprocessing
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| 72 | this file is never empty. */
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| 73 | typedef int textutils_fileblocks_unused;
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| 74 | #endif
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