| 1 | /* Convert file size to number of blocks on System V-like machines. |
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| 2 | Copyright (C) 1990, 1997, 1998, 1999 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This program is free software; you can redistribute it and/or modify |
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| 5 | it under the terms of the GNU General Public License as published by |
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| 6 | the Free Software Foundation; either version 2, or (at your option) |
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| 7 | any later version. |
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| 8 | |
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| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | GNU General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU General Public License |
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| 15 | along with this program; if not, write to the Free Software Foundation, |
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| 16 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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| 17 | |
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| 18 | /* Written by Brian L. Matthews, blm@6sceng.UUCP. */ |
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| 19 | |
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| 20 | #if HAVE_CONFIG_H |
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| 21 | # include <config.h> |
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| 22 | #endif |
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| 23 | |
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| 24 | #include <sys/types.h> |
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| 25 | |
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| 26 | #if HAVE_SYS_PARAM_H |
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| 27 | # include <sys/param.h> |
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| 28 | #endif |
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| 29 | |
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| 30 | #if !HAVE_STRUCT_STAT_ST_BLOCKS && !defined _POSIX_SOURCE && defined BSIZE |
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| 31 | |
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| 32 | # if HAVE_UNISTD_H |
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| 33 | # include <unistd.h> |
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| 34 | # endif |
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| 35 | |
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| 36 | # ifndef NINDIR |
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| 37 | |
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| 38 | # if defined (__DJGPP__) |
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| 39 | typedef long daddr_t; /* for disk address */ |
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| 40 | # endif |
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| 41 | |
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| 42 | /* Some SysV's, like Irix, seem to lack this. Hope it's correct. */ |
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| 43 | /* Number of inode pointers per indirect block. */ |
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| 44 | # define NINDIR (BSIZE / sizeof (daddr_t)) |
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| 45 | # endif /* !NINDIR */ |
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| 46 | |
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| 47 | /* Number of direct block addresses in an inode. */ |
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| 48 | # define NDIR 10 |
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| 49 | |
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| 50 | /* Return the number of 512-byte blocks in a file of SIZE bytes. */ |
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| 51 | |
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| 52 | off_t |
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| 53 | st_blocks (off_t size) |
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| 54 | { |
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| 55 | off_t datablks = size / 512 + (size % 512 != 0); |
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| 56 | off_t indrblks = 0; |
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| 57 | |
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| 58 | if (datablks > NDIR) |
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| 59 | { |
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| 60 | indrblks = (datablks - NDIR - 1) / NINDIR + 1; |
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| 61 | |
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| 62 | if (datablks > NDIR + NINDIR) |
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| 63 | { |
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| 64 | indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1; |
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| 65 | |
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| 66 | if (datablks > NDIR + NINDIR + NINDIR * NINDIR) |
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| 67 | indrblks++; |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | return datablks + indrblks; |
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| 72 | } |
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| 73 | #else |
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| 74 | /* This declaration is solely to ensure that after preprocessing |
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| 75 | this file is never empty. */ |
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| 76 | extern int textutils_fileblocks_unused; |
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| 77 | #endif |
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