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
ubi_devnum_from_devname(const char * str)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
ubi_get_volid_by_name(unsigned ubi_devnum,const char * vol_name)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 buf[UBI_MAX_VOLUME_NAME] = '\0';
39 strchrnul(buf, '\n')[0] = '\0';
40 if (strcmp(vol_name, buf) == 0)
41 return i;
42 }
43 bb_error_msg_and_die("volume '%s' not found", vol_name);
44 }
45