Last change
on this file since 3376 was 3320, checked in by Bruno Cornec, 10 years ago |
- Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in
the move to 3.0
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-
Property svn:eol-style
set to
native
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File size:
1.1 KB
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Rev | Line | |
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[3320] | 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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