/* * Copyright (c) 2009 Martin Decky * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** @addtogroup libc * @{ */ /** @file */ #ifndef _LIBC_GCDLCM_H_ #define _LIBC_GCDLCM_H_ #include <stddef.h> #include <stdint.h> #define DECLARE_GCD(type, name) \ static inline type name(type a, type b) \ { \ if (a == 0) \ return b; \ \ while (b != 0) { \ if (a > b) \ a -= b; \ else \ b -= a; \ } \ \ return a; \ } #define DECLARE_LCM(type, name, gcd) \ static inline type name(type a, type b) \ { \ return (a * b) / gcd(a, b); \ } DECLARE_GCD(uint32_t, gcd32); DECLARE_GCD(uint64_t, gcd64); DECLARE_GCD(size_t, gcd); DECLARE_LCM(uint32_t, lcm32, gcd32); DECLARE_LCM(uint64_t, lcm64, gcd64); DECLARE_LCM(size_t, lcm, gcd); #endif /** @} */