1 /* Buffer primitives for comparison operations.
2 Copyright (C) 1993 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 */
15
16 #include "system.h"
17 #include "cmpbuf.h"
18
19 /* Least common multiple of two buffer sizes A and B. */
20
21 size_t
buffer_lcm(a,b)22 buffer_lcm (a, b)
23 size_t a, b;
24 {
25 size_t m, n, r;
26
27 /* Yield reasonable values if buffer sizes are zero. */
28 if (!a)
29 return b ? b : 8 * 1024;
30 if (!b)
31 return a;
32
33 /* n = gcd (a, b) */
34 for (m = a, n = b; (r = m % n) != 0; m = n, n = r)
35 continue;
36
37 return a/n * b;
38 }
39