LXR busybox/libbb/ubi.c

   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
  17unsigned 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
  26int 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