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annotate lib/fileblocks.c @ 1278:9ad625a30b7d

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Use #if, not #ifdef with HAVE_ macros
author Jim Meyering <jim@meyering.net>
date Sun, 15 Mar 1998 11:09:10 +0000
parents 92fcf946db19
children 38fd8f5d359d
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1 /* Convert file size to number of blocks on System V-like machines.
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2 Copyright (C) 1990, 1997, 1998 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_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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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 (size)
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54 off_t size;
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55 {
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56 off_t datablks = size / 512 + (size % 512 != 0);
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57 off_t indrblks = 0;
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58
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59 if (datablks > NDIR)
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60 {
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61 indrblks = (datablks - NDIR - 1) / NINDIR + 1;
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62
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63 if (datablks > NDIR + NINDIR)
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64 {
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65 indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1;
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66
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67 if (datablks > NDIR + NINDIR + NINDIR * NINDIR)
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68 indrblks++;
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69 }
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70 }
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71
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72 return datablks + indrblks;
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73 }
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74 #else
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75 /* This declaration is solely to ensure that after preprocessing
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76 this file is never empty. */
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77 extern int textutils_fileblocks_unused;
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78 #endif