blob: 34595d79790c409d21c8714658760e83c522f15b
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 2016 Denys Vlasenko |
6 | * |
7 | * Licensed under GPLv2, see file LICENSE in this source tree. |
8 | */ |
9 | //kbuild:lib-y += ubi.o |
10 | |
11 | #include "libbb.h" |
12 | |
13 | // from ubi-media.h |
14 | #define UBI_MAX_VOLUME_NAME 127 |
15 | #define UBI_MAX_VOLUMES 128 |
16 | |
17 | unsigned FAST_FUNC ubi_devnum_from_devname(const char *str) |
18 | { |
19 | unsigned ubi_devnum; |
20 | |
21 | if (sscanf(str, "/dev/ubi%u", &ubi_devnum) != 1) |
22 | bb_error_msg_and_die("not an UBI device: '%s'", str); |
23 | return ubi_devnum; |
24 | } |
25 | |
26 | int FAST_FUNC ubi_get_volid_by_name(unsigned ubi_devnum, const char *vol_name) |
27 | { |
28 | unsigned i; |
29 | |
30 | for (i = 0; i < UBI_MAX_VOLUMES; i++) { |
31 | char buf[UBI_MAX_VOLUME_NAME + 1]; |
32 | char fname[sizeof("/sys/class/ubi/ubi%u_%u/name") + 2 * sizeof(int)*3]; |
33 | |
34 | sprintf(fname, "/sys/class/ubi/ubi%u_%u/name", ubi_devnum, i); |
35 | if (open_read_close(fname, buf, sizeof(buf)) <= 0) |
36 | continue; |
37 | |
38 | strchrnul(buf, '\n')[0] = '\0'; |
39 | if (strcmp(vol_name, buf) == 0) |
40 | return i; |
41 | } |
42 | bb_error_msg_and_die("volume '%s' not found", vol_name); |
43 | } |
44 |