freebsd-dev/contrib/cvs/diff/cmpbuf.c

/* 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.

   */

#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;
}