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/* Buffer primitives for comparison operations.
  Copyright (C) 1993 Free Software Foundation, Inc.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2, or (at your option)
  any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "system.h"
#include "cmpbuf.h"

/* Least common multiple of two buffer sizes A and B.  */

size_t
buffer_lcm (a, b)
    size_t a, b;
{
 size_t m, n, r;

 /* Yield reasonable values if buffer sizes are zero.  */
 if (!a)
   return b ? b : 8 * 1024;
 if (!b)
   return a;

 /* n = gcd (a, b) */
 for (m = a, n = b;  (r = m % n) != 0;  m = n, n = r)
   continue;

 return a/n * b;
}