/contrib/cvs/diff/cmpbuf.c

 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
21size_t
22buffer_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}