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44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*
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* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LVM_PERCENT_H
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#define _LVM_PERCENT_H
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#include <stdint.h>
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/*
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* A fixed-point representation of percent values. One percent equals to
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* PERCENT_1 as defined below. Values that are not multiples of PERCENT_1
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* represent fractions, with precision of 1/1000000 of a percent. See
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* percent_to_float for a conversion to a floating-point representation.
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*
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* You should always use make_percent when building percent_t values. The
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* implementation of make_percent is biased towards the middle: it ensures that
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* the result is PERCENT_0 or PERCENT_100 if and only if this is the actual
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* value -- it never rounds any intermediate value (> 0 or < 100) to either 0
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* or 100.
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*/
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typedef int32_t percent_t;
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typedef enum {
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PERCENT_0 = 0,
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PERCENT_1 = 1000000,
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PERCENT_100 = 100 * PERCENT_1,
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PERCENT_INVALID = -1
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} percent_range_t;
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float percent_to_float(percent_t v);
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percent_t make_percent(uint64_t numerator, uint64_t denominator);
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#endif
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