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3e6c955de6
These files #included <assert.h> but didn't ever use assert. Signed-off-by: Ben Pfaff <blp@nicira.com> Acked-by: Ethan Jackson <ethan@nicira.com>
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/*
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* Copyright (c) 2008, 2012 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SAT_MATH_H
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#define SAT_MATH_H 1
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#include <limits.h>
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/* Saturating addition: overflow yields UINT_MAX. */
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static inline unsigned int
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sat_add(unsigned int x, unsigned int y)
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{
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return x + y >= x ? x + y : UINT_MAX;
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}
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/* Saturating subtraction: underflow yields 0. */
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static inline unsigned int
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sat_sub(unsigned int x, unsigned int y)
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{
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return x >= y ? x - y : 0;
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}
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/* Saturating multiplication of "unsigned int"s: overflow yields UINT_MAX. */
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#define SAT_MUL(X, Y) \
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((Y) == 0 ? 0 \
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: (X) <= UINT_MAX / (Y) ? (unsigned int) (X) * (unsigned int) (Y) \
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: UINT_MAX)
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static inline unsigned int
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sat_mul(unsigned int x, unsigned int y)
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{
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return SAT_MUL(x, y);
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}
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#endif /* sat-math.h */
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