gcdlcm.h

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00001 /*
00002  * Copyright (c) 2009 Martin Decky
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  *
00009  * - Redistributions of source code must retain the above copyright
00010  *   notice, this list of conditions and the following disclaimer.
00011  * - Redistributions in binary form must reproduce the above copyright
00012  *   notice, this list of conditions and the following disclaimer in the
00013  *   documentation and/or other materials provided with the distribution.
00014  * - The name of the author may not be used to endorse or promote products
00015  *   derived from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00018  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00019  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00020  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00021  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00022  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00023  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00024  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00025  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00026  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00027  */
00028 
00035 #ifndef LIBC_GCDLCM_H_
00036 #define LIBC_GCDLCM_H_
00037 
00038 #include <sys/types.h>
00039 
00040 #define DECLARE_GCD(type, name) \
00041         static inline type name(type a, type b) \
00042         { \
00043                 if (a == 0) \
00044                         return b; \
00045                  \
00046                 while (b != 0) { \
00047                         if (a > b) \
00048                                 a -= b; \
00049                         else \
00050                                 b -= a; \
00051                 } \
00052                  \
00053                 return a; \
00054         }
00055 
00056 #define DECLARE_LCM(type, name, gcd) \
00057         static inline type name(type a, type b) \
00058         { \
00059                 return (a * b) / gcd(a, b); \
00060         }
00061 
00062 DECLARE_GCD(uint32_t, gcd32);
00063 DECLARE_GCD(uint64_t, gcd64);
00064 DECLARE_GCD(size_t, gcd);
00065 
00066 DECLARE_LCM(uint32_t, lcm32, gcd32);
00067 DECLARE_LCM(uint64_t, lcm64, gcd64);
00068 DECLARE_LCM(size_t, lcm, gcd);
00069 
00070 #endif
00071 

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