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  1. /*
  2.  * Copyright (c) 2009 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef LIBC_GCDLCM_H_
  36. #define LIBC_GCDLCM_H_
  37.  
  38. #include <sys/types.h>
  39.  
  40. #define DECLARE_GCD(type, name) \
  41.     static inline type name(type a, type b) \
  42.     { \
  43.         if (a == 0) \
  44.             return b; \
  45.          \
  46.         while (b != 0) { \
  47.             if (a > b) \
  48.                 a -= b; \
  49.             else \
  50.                 b -= a; \
  51.         } \
  52.          \
  53.         return a; \
  54.     }
  55.  
  56. #define DECLARE_LCM(type, name, gcd) \
  57.     static inline type name(type a, type b) \
  58.     { \
  59.         return (a * b) / gcd(a, b); \
  60.     }
  61.  
  62. DECLARE_GCD(uint32_t, gcd32);
  63. DECLARE_GCD(uint64_t, gcd64);
  64. DECLARE_GCD(size_t, gcd);
  65.  
  66. DECLARE_LCM(uint32_t, lcm32, gcd32);
  67. DECLARE_LCM(uint64_t, lcm64, gcd64);
  68. DECLARE_LCM(size_t, lcm, gcd);
  69.  
  70. #endif
  71.  
  72. /** @}
  73.  */
  74.