1*0b459c2cSDavid du Colombier /* Buffer primitives for comparison operations.
2*0b459c2cSDavid du Colombier Copyright (C) 1993 Free Software Foundation, Inc.
3*0b459c2cSDavid du Colombier
4*0b459c2cSDavid du Colombier This program is free software; you can redistribute it and/or modify
5*0b459c2cSDavid du Colombier it under the terms of the GNU General Public License as published by
6*0b459c2cSDavid du Colombier the Free Software Foundation; either version 2, or (at your option)
7*0b459c2cSDavid du Colombier any later version.
8*0b459c2cSDavid du Colombier
9*0b459c2cSDavid du Colombier This program is distributed in the hope that it will be useful,
10*0b459c2cSDavid du Colombier but WITHOUT ANY WARRANTY; without even the implied warranty of
11*0b459c2cSDavid du Colombier MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12*0b459c2cSDavid du Colombier GNU General Public License for more details.
13*0b459c2cSDavid du Colombier
14*0b459c2cSDavid du Colombier You should have received a copy of the GNU General Public License
15*0b459c2cSDavid du Colombier along with this program; if not, write to the Free Software
16*0b459c2cSDavid du Colombier Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
17*0b459c2cSDavid du Colombier
18*0b459c2cSDavid du Colombier #include "system.h"
19*0b459c2cSDavid du Colombier #include "cmpbuf.h"
20*0b459c2cSDavid du Colombier
21*0b459c2cSDavid du Colombier /* Least common multiple of two buffer sizes A and B. */
22*0b459c2cSDavid du Colombier
23*0b459c2cSDavid du Colombier size_t
buffer_lcm(a,b)24*0b459c2cSDavid du Colombier buffer_lcm (a, b)
25*0b459c2cSDavid du Colombier size_t a, b;
26*0b459c2cSDavid du Colombier {
27*0b459c2cSDavid du Colombier size_t m, n, r;
28*0b459c2cSDavid du Colombier
29*0b459c2cSDavid du Colombier /* Yield reasonable values if buffer sizes are zero. */
30*0b459c2cSDavid du Colombier if (!a)
31*0b459c2cSDavid du Colombier return b ? b : 8 * 1024;
32*0b459c2cSDavid du Colombier if (!b)
33*0b459c2cSDavid du Colombier return a;
34*0b459c2cSDavid du Colombier
35*0b459c2cSDavid du Colombier /* n = gcd (a, b) */
36*0b459c2cSDavid du Colombier for (m = a, n = b; (r = m % n) != 0; m = n, n = r)
37*0b459c2cSDavid du Colombier continue;
38*0b459c2cSDavid du Colombier
39*0b459c2cSDavid du Colombier return a/n * b;
40*0b459c2cSDavid du Colombier }
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