src/lib/intmath/muldiv.h

   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 muldiv.h
   8  *
   9  * \brief Header for muldiv.c
  10  **/
  11
  12 #ifndef TOR_INTMATH_MULDIV_H
  13 #define TOR_INTMATH_MULDIV_H
  14
  15 #include "lib/cc/torint.h"
  16
  17 unsigned round_to_next_multiple_of(unsigned number, unsigned divisor);
  18 uint32_t round_uint32_to_next_multiple_of(uint32_t number, uint32_t divisor);
  19 uint64_t round_uint64_to_next_multiple_of(uint64_t number, uint64_t divisor);
  20
  21 uint64_t tor_mul_u64_nowrap(uint64_t a, uint64_t b);
  22
  23 void simplify_fraction64(uint64_t *numer, uint64_t *denom);
  24
  25 /* Compute the CEIL of <b>a</b> divided by <b>b</b>, for nonnegative <b>a</b>
  26  * and positive <b>b</b>.  Works on integer types only. Not defined if a+(b-1)
  27  * can overflow. */
  28 #define CEIL_DIV(a,b) (((a)+((b)-1))/(b))
  29
  30 #endif /* !defined(TOR_INTMATH_MULDIV_H) */