Last change
on this file since 3880 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
|
-
Property svn:eol-style
set to
native
|
File size:
1.1 KB
|
Rev | Line | |
---|
[3320] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * Utility routines.
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 2010 Denys Vlasenko
|
---|
| 6 | *
|
---|
| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
| 8 | */
|
---|
| 9 | #include "libbb.h"
|
---|
| 10 |
|
---|
| 11 | uoff_t FAST_FUNC get_volume_size_in_bytes(int fd,
|
---|
| 12 | const char *override,
|
---|
| 13 | unsigned override_units,
|
---|
| 14 | int extend)
|
---|
| 15 | {
|
---|
| 16 | uoff_t result;
|
---|
| 17 |
|
---|
| 18 | if (override) {
|
---|
| 19 | result = XATOOFF(override);
|
---|
| 20 | if (result >= (uoff_t)(MAXINT(off_t)) / override_units)
|
---|
| 21 | bb_error_msg_and_die("image size is too big");
|
---|
| 22 | result *= override_units;
|
---|
| 23 | /* seek past end fails on block devices but works on files */
|
---|
| 24 | if (lseek(fd, result - 1, SEEK_SET) != (off_t)-1) {
|
---|
| 25 | if (extend)
|
---|
| 26 | xwrite(fd, "", 1); /* file grows if needed */
|
---|
| 27 | }
|
---|
| 28 | //else {
|
---|
| 29 | // bb_error_msg("warning, block device is smaller");
|
---|
| 30 | //}
|
---|
| 31 | } else {
|
---|
| 32 | /* more portable than BLKGETSIZE[64] */
|
---|
| 33 | result = xlseek(fd, 0, SEEK_END);
|
---|
| 34 | }
|
---|
| 35 |
|
---|
| 36 | xlseek(fd, 0, SEEK_SET);
|
---|
| 37 |
|
---|
| 38 | /* Prevent things like this:
|
---|
| 39 | * $ dd if=/dev/zero of=foo count=1 bs=1024
|
---|
| 40 | * $ mkswap foo
|
---|
| 41 | * Setting up swapspace version 1, size = 18446744073709548544 bytes
|
---|
| 42 | *
|
---|
| 43 | * Picked 16k arbitrarily: */
|
---|
| 44 | if (result < 16*1024)
|
---|
| 45 | bb_error_msg_and_die("image is too small");
|
---|
| 46 |
|
---|
| 47 | return result;
|
---|
| 48 | }
|
---|
Note:
See
TracBrowser
for help on using the repository browser.