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       1                 :            : /*
       2                 :            :  * Copyright (c) 2008, 2012 Nicira, Inc.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License");
       5                 :            :  * you may not use this file except in compliance with the License.
       6                 :            :  * You may obtain a copy of the License at:
       7                 :            :  *
       8                 :            :  *     http://www.apache.org/licenses/LICENSE-2.0
       9                 :            :  *
      10                 :            :  * Unless required by applicable law or agreed to in writing, software
      11                 :            :  * distributed under the License is distributed on an "AS IS" BASIS,
      12                 :            :  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      13                 :            :  * See the License for the specific language governing permissions and
      14                 :            :  * limitations under the License.
      15                 :            :  */
      16                 :            : 
      17                 :            : #ifndef SAT_MATH_H
      18                 :            : #define SAT_MATH_H 1
      19                 :            : 
      20                 :            : #include <limits.h>
      21                 :            : #include "openvswitch/util.h"
      22                 :            : 
      23                 :            : /* Saturating addition: overflow yields UINT_MAX. */
      24                 :            : static inline unsigned int
      25                 :     228496 : sat_add(unsigned int x, unsigned int y)
      26                 :            : {
      27         [ +  + ]:     228496 :     return x + y >= x ? x + y : UINT_MAX;
      28                 :            : }
      29                 :            : 
      30                 :            : /* Saturating subtraction: underflow yields 0. */
      31                 :            : static inline unsigned int
      32                 :            : sat_sub(unsigned int x, unsigned int y)
      33                 :            : {
      34                 :            :     return x >= y ? x - y : 0;
      35                 :            : }
      36                 :            : 
      37                 :            : static inline unsigned int
      38                 :      14715 : sat_mul(unsigned int x, unsigned int y)
      39                 :            : {
      40 [ +  - ][ +  + ]:      14715 :     return OVS_SAT_MUL(x, y);
      41                 :            : }
      42                 :            : 
      43                 :            : #endif /* sat-math.h */