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 You should have received a copy of the GNU General Public License 15 along with this program; if not, write to the Free Software 16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ 17 18 #include "system.h" 19 #include "cmpbuf.h" 20 21 /* Least common multiple of two buffer sizes A and B. */ 22 23 size_t 24 buffer_lcm (a, b) 25 size_t a, b; 26 { 27 size_t m, n, r; 28 29 /* Yield reasonable values if buffer sizes are zero. */ 30 if (!a) 31 return b ? b : 8 * 1024; 32 if (!b) 33 return a; 34 35 /* n = gcd (a, b) */ 36 for (m = a, n = b; (r = m % n) != 0; m = n, n = r) 37 continue; 38 39 return a/n * b; 40 } 41