Last change
on this file since 3345 was 2725, checked in by Bruno Cornec, 14 years ago |
- Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
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-
Property svn:eol-style
set to
native
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File size:
1.1 KB
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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) 2010 Denys Vlasenko
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 | #include "libbb.h"
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10 |
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11 | uoff_t FAST_FUNC get_volume_size_in_bytes(int fd,
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12 | const char *override,
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13 | unsigned override_units,
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14 | int extend)
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15 | {
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16 | uoff_t result;
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17 |
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18 | if (override) {
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19 | result = XATOOFF(override);
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20 | if (result >= (uoff_t)(MAXINT(off_t)) / override_units)
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21 | bb_error_msg_and_die("image size is too big");
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22 | result *= override_units;
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23 | /* seek past end fails on block devices but works on files */
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24 | if (lseek(fd, result - 1, SEEK_SET) != (off_t)-1) {
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25 | if (extend)
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26 | xwrite(fd, "", 1); /* file grows if needed */
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27 | }
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28 | //else {
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29 | // bb_error_msg("warning, block device is smaller");
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30 | //}
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31 | } else {
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32 | /* more portable than BLKGETSIZE[64] */
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33 | result = xlseek(fd, 0, SEEK_END);
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34 | }
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35 |
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36 | xlseek(fd, 0, SEEK_SET);
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37 |
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38 | /* Prevent things like this:
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39 | * $ dd if=/dev/zero of=foo count=1 bs=1024
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40 | * $ mkswap foo
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41 | * Setting up swapspace version 1, size = 18446744073709548544 bytes
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42 | *
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43 | * Picked 16k arbitrarily: */
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44 | if (result < 16*1024)
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45 | bb_error_msg_and_die("image is too small");
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46 |
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47 | return result;
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48 | }
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