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 /* @(#)cmpbytes.c 1.15 03/06/15 Copyright 1988, 1995-2003 J. Schilling */
17 * Copyright (c) 1988, 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 cmpbytes(fromp, top, cnt)
46 register const char *from = (char *)fromp;
47 register const char *to = (char *)top;
52 * If we change cnt to be unsigned, check for == instead of <=
58 * Compare byte-wise until properly aligned for a long pointer.
60 i = sizeof (long) - 1;
61 while (--n >= 0 && --i >= 0 && !l2aligned(from, to)) {
67 if (n >= (int)(8 * sizeof (long))) {
68 if (l2aligned(from, to)) {
69 register const long *froml = (const long *)from;
70 register const long *tol = (const long *)to;
71 register int rem = n % (8 * sizeof (long));
73 n /= (8 * sizeof (long));
76 if (*tol++ != *froml++)
84 to = (const char *)tol;
85 from = (const char *)froml;
88 to = (const char *)tol;
89 from = (const char *)froml;
100 } while ((n -= 8) >= 0);
104 if (*to++ != *from++)
110 if (*to++ != *from++)
117 if (*to++ != *from++)
121 return (--from - (char *)fromp);