45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 2016 Denys Vlasenko
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//kbuild:lib-y += ubi.o
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#include "libbb.h"
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// from ubi-media.h
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#define UBI_MAX_VOLUME_NAME 127
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#define UBI_MAX_VOLUMES 128
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unsigned FAST_FUNC ubi_devnum_from_devname(const char *str)
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{
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unsigned ubi_devnum;
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if (sscanf(str, "/dev/ubi%u", &ubi_devnum) != 1)
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bb_error_msg_and_die("not an UBI device: '%s'", str);
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return ubi_devnum;
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}
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int FAST_FUNC ubi_get_volid_by_name(unsigned ubi_devnum, const char *vol_name)
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{
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unsigned i;
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for (i = 0; i < UBI_MAX_VOLUMES; i++) {
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char buf[UBI_MAX_VOLUME_NAME + 1];
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char fname[sizeof("/sys/class/ubi/ubi%u_%u/name") + 2 * sizeof(int)*3];
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sprintf(fname, "/sys/class/ubi/ubi%u_%u/name", ubi_devnum, i);
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if (open_read_close(fname, buf, sizeof(buf)) <= 0)
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continue;
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buf[UBI_MAX_VOLUME_NAME] = '\0';
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strchrnul(buf, '\n')[0] = '\0';
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if (strcmp(vol_name, buf) == 0)
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return i;
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}
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bb_error_msg_and_die("volume '%s' not found", vol_name);
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}
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