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