2 * This file has been modified for the cdrkit suite.
4 * The behaviour and appearence of the program code below can differ to a major
5 * extent from the version distributed by the original author(s).
7 * For details, see Changelog file distributed with the cdrkit package. If you
8 * received this file from another source then ask the distributing person for
9 * a log of modifications.
13 /* @(#)movebytes.c 1.13 03/06/15 Copyright 1985, 1989, 1995-2003 J. Schilling */
17 * Copyright (c) 1985, 1989, 1995-2003 J. Schilling
20 * This program is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License version 2
22 * as published by the Free Software Foundation.
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
29 * You should have received a copy of the GNU General Public License along with
30 * this program; see the file COPYING. If not, write to the Free Software
31 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
38 #define DO8(a) a; a; a; a; a; a; a; a;
41 movebytes(fromv, tov, cnt)
46 register const char *from = fromv;
47 register char *to = tov;
51 * If we change cnt to be unsigned, check for == instead of <=
58 * source is on higher adresses than destination:
61 if (n >= (int)(8 * sizeof (long))) {
62 if (l2aligned(from, to)) {
63 register const long *froml = (const long *)from;
64 register long *tol = (long *)to;
65 register int rem = n % (8 * sizeof (long));
67 n /= (8 * sizeof (long));
69 DO8 (*tol++ = *froml++);
72 from = (const char *)froml;
80 DO8 (*to++ = *from++);
81 } while ((n -= 8) >= 0);
98 * source is on lower adresses than destination:
99 * move bytes backwards
104 if (n >= (int)(8 * sizeof (long))) {
105 if (l2aligned(from, to)) {
106 register const long *froml = (const long *)from;
107 register long *tol = (long *)to;
108 register int rem = n % (8 * sizeof (long));
110 n /= (8 * sizeof (long));
112 DO8 (*--tol = *--froml);
115 from = (const char *)froml;
122 DO8 (*--to = *--from);
123 } while ((n -= 8) >= 0);