1 files changed, 53 insertions, 0 deletions
diff --git a/410kern/string/memcmp.c b/410kern/string/memcmp.c
new file mode 100644
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--- /dev/null
+++ b/410kern/string/memcmp.c
@@ -0,0 +1,53 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1992,1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+ * File: 	limach/memcmp.c
+ * Author:	Robert V. Baron at Carnegie Mellon
+ * Date:	Oct 13, 1992
+ * Abstract:
+ *	strcmp (s1, s2) compares the strings "s1" and "s2".
+ *	It returns 0 if the strings are identical. It returns
+ *	> 0 if the first character that differs into two strings
+ *	is larger in s1 than in s2 or if s1 is longer than s2 and 
+ *	the contents  are identical up to the length of s2.
+ *	It returns < 0 if the first differing character is smaller 
+ *	in s1 than in s2 or if s1 is shorter than s2 and the
+ *	contents are identical upto the length of s1.
+ */
+
+int
+memcmp(const void *s1v, const void *s2v, int size)
+{
+	register const char *s1 = s1v, *s2 = s2v;
+	register unsigned int a, b;
+
+	while (size-- > 0) {
+		if ((a = *s1++) != (b = *s2++))
+			return (a-b);
+	}
+
+	return 0;
+}