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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 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 |
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16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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 !defined (HAVE_ST_BLOCKS) && !defined(_POSIX_SOURCE) |
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21 #include <sys/types.h> |
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22 #include <sys/param.h> |
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23 |
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24 #ifndef NINDIR |
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25 /* Some SysV's, like Irix, seem to lack these. Hope they're correct. */ |
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26 /* Size of a indirect block, in bytes. */ |
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27 #define BSIZE 1024 |
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28 |
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29 /* Number of inode pointers per indirect block. */ |
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30 #define NINDIR (BSIZE/sizeof(daddr_t)) |
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31 #endif /* !NINDIR */ |
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32 |
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33 /* Number of direct block addresses in an inode. */ |
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34 #define NDIR 10 |
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35 |
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36 /* Return the number of 512-byte blocks in a file of SIZE bytes. */ |
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37 |
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38 long |
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39 st_blocks (size) |
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40 long size; |
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41 { |
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42 long datablks = (size + 512 - 1) / 512; |
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43 long indrblks = 0; |
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44 |
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45 if (datablks > NDIR) |
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46 { |
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47 indrblks = (datablks - NDIR - 1) / NINDIR + 1; |
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48 |
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49 if (datablks > NDIR + NINDIR) |
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50 { |
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51 indrblks += (datablks - NDIR - NINDIR - 1) / (NINDIR * NINDIR) + 1; |
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52 |
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53 if (datablks > NDIR + NINDIR + NINDIR * NINDIR) |
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54 indrblks++; |
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55 } |
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56 } |
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57 |
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58 return datablks + indrblks; |
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59 } |
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60 #endif |
