/usr/src/openvswitch-1.4.0/lib/sat-math.h is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | /*
* Copyright (c) 2008 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SAT_MATH_H
#define SAT_MATH_H 1
#include <assert.h>
#include <limits.h>
/* Saturating addition: overflow yields UINT_MAX. */
static inline unsigned int
sat_add(unsigned int x, unsigned int y)
{
return x + y >= x ? x + y : UINT_MAX;
}
/* Saturating subtraction: underflow yields 0. */
static inline unsigned int
sat_sub(unsigned int x, unsigned int y)
{
return x >= y ? x - y : 0;
}
/* Saturating multiplication: overflow yields UINT_MAX. */
static inline unsigned int
sat_mul(unsigned int x, unsigned int y)
{
return (!y ? 0
: x <= UINT_MAX / y ? x * y
: UINT_MAX);
}
#endif /* sat-math.h */
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