cmp.h (1330B)
1 /* Copyright (c) 2003-2004, Roger Dingledine 2 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. 3 * Copyright (c) 2007-2021, The Tor Project, Inc. */ 4 /* See LICENSE for licensing information */ 5 6 /** 7 * \file cmp.h 8 * 9 * \brief Macro definitions for MIN, MAX, and CLAMP. 10 **/ 11 12 #ifndef TOR_INTMATH_CMP_H 13 #define TOR_INTMATH_CMP_H 14 15 /** Macros for MIN/MAX. Never use these when the arguments could have 16 * side-effects. 17 * {With GCC extensions we could probably define a safer MIN/MAX. But 18 * depending on that safety would be dangerous, since not every platform 19 * has it.} 20 **/ 21 #ifndef MAX 22 #define MAX(a,b) ( ((a)<(b)) ? (b) : (a) ) 23 #endif 24 #ifndef MIN 25 #define MIN(a,b) ( ((a)>(b)) ? (b) : (a) ) 26 #endif 27 28 /* Return <b>v</b> if it's between <b>min</b> and <b>max</b>. Otherwise 29 * return <b>min</b> if <b>v</b> is smaller than <b>min</b>, or <b>max</b> if 30 * <b>b</b> is larger than <b>max</b>. 31 * 32 * Requires that <b>min</b> is no more than <b>max</b>. May evaluate any of 33 * its arguments more than once! */ 34 #define CLAMP(min,v,max) \ 35 ( ((v) < (min)) ? (min) : \ 36 ((v) > (max)) ? (max) : \ 37 (v) ) 38 39 /** Give the absolute value of <b>x</b>, independent of its type. */ 40 #define ABS(x) ( ((x)<0) ? -(x) : (x) ) 41 42 #endif /* !defined(TOR_INTMATH_CMP_H) */