2 * Copyright (c) 2008 Nicira Networks.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 /* Saturating addition: overflow yields UINT_MAX. */
24 static inline unsigned int
25 sat_add(unsigned int x, unsigned int y)
27 return x + y >= x ? x + y : UINT_MAX;
30 /* Saturating subtraction: underflow yields 0. */
31 static inline unsigned int
32 sat_sub(unsigned int x, unsigned int y)
34 return x >= y ? x - y : 0;
37 /* Saturating multiplication: overflow yields UINT_MAX. */
38 static inline unsigned int
39 sat_mul(unsigned int x, unsigned int y)
42 : x <= UINT_MAX / y ? x * y
46 #endif /* sat-math.h */