1 files changed, 122 insertions, 0 deletions
diff --git a/librols/cmpbytes.c b/librols/cmpbytes.c
new file mode 100644
index 0000000..360635f
--- /dev/null
+++ b/librols/cmpbytes.c
@@ -0,0 +1,122 @@
+/*
+ * This file has been modified for the cdrkit suite.
+ *
+ * The behaviour and appearence of the program code below can differ to a major
+ * extent from the version distributed by the original author(s).
+ *
+ * For details, see Changelog file distributed with the cdrkit package. If you
+ * received this file from another source then ask the distributing person for
+ * a log of modifications.
+ *
+ */
+
+/* @(#)cmpbytes.c	1.15 03/06/15 Copyright 1988, 1995-2003 J. Schilling */
+/*
+ *	compare data
+ *
+ *	Copyright (c) 1988, 1995-2003 J. Schilling
+ */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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; see the file COPYING.  If not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <standard.h>
+#include <align.h>
+#include <schily.h>
+
+#define	DO8(a)	a; a; a; a; a; a; a; a;
+
+EXPORT int
+cmpbytes(fromp, top, cnt)
+	const void	*fromp;
+	const void	*top;
+	int		cnt;
+{
+	register const char	*from	= (char *)fromp;
+	register const char	*to	= (char *)top;
+	register int		n;
+	register int		i;
+
+	/*
+	 * If we change cnt to be unsigned, check for == instead of <=
+	 */
+	if ((n = cnt) <= 0)
+		return (cnt);
+
+	/*
+	 * Compare byte-wise until properly aligned for a long pointer.
+	 */
+	i = sizeof (long) - 1;
+	while (--n >= 0 && --i >= 0 && !l2aligned(from, to)) {
+		if (*to++ != *from++)
+			goto cdiff;
+	}
+	n++;
+
+	if (n >= (int)(8 * sizeof (long))) {
+		if (l2aligned(from, to)) {
+			register const long *froml = (const long *)from;
+			register const long *tol   = (const long *)to;
+			register int rem = n % (8 * sizeof (long));
+
+			n /= (8 * sizeof (long));
+			do {
+				DO8(
+					if (*tol++ != *froml++)
+						break;
+				);
+			} while (--n > 0);
+
+			if (n > 0) {
+				--froml;
+				--tol;
+				to = (const char *)tol;
+				from = (const char *)froml;
+				goto ldiff;
+			}
+			to = (const char *)tol;
+			from = (const char *)froml;
+			n = rem;
+		}
+
+		if (n >= 8) {
+			n -= 8;
+			do {
+				DO8(
+					if (*to++ != *from++)
+						goto cdiff;
+				);
+			} while ((n -= 8) >= 0);
+			n += 8;
+		}
+		if (n > 0) do {
+			if (*to++ != *from++)
+				goto cdiff;
+		} while (--n > 0);
+		return (cnt);
+	}
+	if (n > 0) do {
+		if (*to++ != *from++)
+			goto cdiff;
+	} while (--n > 0);
+	return (cnt);
+ldiff:
+	n = sizeof (long);
+	do {
+		if (*to++ != *from++)
+			goto cdiff;
+	} while (--n > 0);
+cdiff:
+	return (--from - (char *)fromp);
+}