Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/file-set-size.c @ 221:ed0d5b17c7a4 HEAD

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Added extra functions for easier printing of error messages. Moved file_set_size() to generic function in lib. If there's no space to build hash file, it builds itself in anon-mmaped memory and stays there.
author Timo Sirainen <tss@iki.fi>
date Fri, 13 Sep 2002 03:01:23 +0300
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children cf4d065f2f85
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221
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1 /*
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2 file-set-size.c - portable way to grow/shrink file size
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3
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4 Copyright (c) 2002 Timo Sirainen
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5
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6 Permission is hereby granted, free of charge, to any person obtaining
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7 a copy of this software and associated documentation files (the
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8 "Software"), to deal in the Software without restriction, including
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9 without limitation the rights to use, copy, modify, merge, publish,
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10 distribute, sublicense, and/or sell copies of the Software, and to
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11 permit persons to whom the Software is furnished to do so, subject to
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12 the following conditions:
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13
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14 The above copyright notice and this permission notice shall be
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15 included in all copies or substantial portions of the Software.
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16
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17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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18 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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20 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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21 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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22 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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23 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 */
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25
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26 #include "lib.h"
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27 #include "write-full.h"
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28
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29 #include <unistd.h>
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30
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31 int file_set_size(int fd, off_t size)
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32 {
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33 char block[1024];
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34 int ret, old_errno;
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35 off_t pos;
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36
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37 i_assert(size >= 0);
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38
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39 /* try truncating it to the size we want. if this succeeds, the written
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40 area is full of zeros - exactly what we want. however, this may not
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41 work at all, in which case we fallback to write()ing the zeros. */
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42 ret = ftruncate(fd, size);
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43 old_errno = errno;
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44
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45 pos = lseek(fd, 0, SEEK_END);
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46 if (ret != -1 && pos == size)
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47 return lseek(fd, 0, SEEK_SET) < 0 ? -1 : 0;
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48
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49 if (pos < 0)
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50 return -1;
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51 if (pos > size) {
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52 /* ftruncate() failed for some reason, even while we were
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53 trying to make the file smaller */
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54 errno = old_errno;
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55 return -1;
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56 }
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57
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58 /* start growing the file */
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59 size -= pos;
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60 memset(block, 0, sizeof(block));
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61
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62 while ((uoff_t)size > sizeof(block)) {
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63 /* write in 1kb blocks */
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64 if (write_full(fd, block, sizeof(block)) < 0)
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65 return -1;
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66 size -= sizeof(block);
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67 }
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68
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69 /* write the remainder */
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70 return write_full(fd, block, (size_t)size) < 0 ? -1 : 0;
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71 }