114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
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/*
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* Copyright (c) 2001-2002, David Janssens
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Get the minimum of two integers.
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*
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* returns a if a < b else b
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*/
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int int_min(int a, int b)
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{
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return a < b ? a : b;
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}
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/*
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* Get the maximum of two integers.
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*
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* returns a if a > b else b
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*/
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int int_max(int a, int b)
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{
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return a > b ? a : b;
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}
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/*
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* Clamp an integer inside an interval.
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*
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* return a if (min < a < max)
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* return max if (a > max)
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* return min if (a < min)
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*/
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int int_clamp(int a, int min, int max)
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{
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if (a < min)
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return min;
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if (a > max)
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return max;
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return a;
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}
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/*
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* Get absolute value of integer.
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*/
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int int_abs(int a)
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{
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return a < 0 ? -a : a;
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}
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/*
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* Divide an integer and round upwards.
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*
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* a divided by b
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*/
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int int_ceildiv(int a, int b)
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{
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return (a + b - 1) / b;
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}
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/*
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* Divide an integer by a power of 2 and round upwards.
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*
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* a divided by 2^b
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*/
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int int_ceildivpow2(int a, int b)
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{
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return (a + (1 << b) - 1) >> b;
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}
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/*
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* Divide an integer by a power of 2 and round downwards.
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*
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* a divided by 2^b
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*/
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int int_floordivpow2(int a, int b)
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{
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return a >> b;
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}
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/*
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* Get logarithm of an integer and round downwards.
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*
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* log2(a)
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*/
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int int_floorlog2(int a)
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{
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int l;
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for (l = 0; a > 1; l++) {
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a >>= 1;
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}
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return l;
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}
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