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| 4601 | decky | 1 | /* |
| 2 | * Copyright (c) 2009 Martin Decky |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup libc |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 35 | #ifndef LIBC_GCDLCM_H_ |
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| 36 | #define LIBC_GCDLCM_H_ |
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| 37 | |||
| 38 | #include <sys/types.h> |
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| 39 | |||
| 40 | #define DECLARE_GCD(type, name) \ |
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| 41 | static inline type name(type a, type b) \ |
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| 42 | { \ |
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| 43 | if (a == 0) \ |
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| 44 | return b; \ |
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| 45 | \ |
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| 46 | while (b != 0) { \ |
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| 47 | if (a > b) \ |
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| 48 | a -= b; \ |
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| 49 | else \ |
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| 50 | b -= a; \ |
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| 51 | } \ |
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| 52 | \ |
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| 53 | return a; \ |
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| 54 | } |
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| 55 | |||
| 56 | #define DECLARE_LCM(type, name, gcd) \ |
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| 57 | static inline type name(type a, type b) \ |
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| 58 | { \ |
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| 59 | return (a * b) / gcd(a, b); \ |
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| 60 | } |
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| 61 | |||
| 62 | DECLARE_GCD(uint32_t, gcd32); |
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| 63 | DECLARE_GCD(uint64_t, gcd64); |
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| 64 | DECLARE_GCD(size_t, gcd); |
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| 65 | |||
| 66 | DECLARE_LCM(uint32_t, lcm32, gcd32); |
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| 67 | DECLARE_LCM(uint64_t, lcm64, gcd64); |
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| 68 | DECLARE_LCM(size_t, lcm, gcd); |
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| 69 | |||
| 70 | #endif |
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| 71 | |||
| 72 | /** @} |
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| 73 | */ |