--- xnu/xnu-12377.121.6/iokit/Kernel/IOStringFuncs.c
+++ xnu/xnu-6153.41.3/iokit/Kernel/IOStringFuncs.c
@@ -86,6 +86,7 @@
 unsigned long strtoul(const char *nptr, char **endptr, int base);
 quad_t strtoq(const char *nptr, char **endptr, int base);
 u_quad_t strtouq(const char *nptr, char **endptr, int base);
+char *strncat(char *s1, const char *s2, unsigned long n);
 
 
 typedef int BOOL;
@@ -177,7 +178,7 @@
 	 * overflow.
 	 */
 	cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
-	cutlim = ((int)(cutoff % (unsigned long)base));
+	cutlim = cutoff % (unsigned long)base;
 	cutoff /= (unsigned long)base;
 	for (acc = 0, any = 0;; c = *s++) {
 		if (isdigit(c)) {
@@ -250,7 +251,7 @@
 		base = c == '0' ? 8 : 10;
 	}
 	cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
-	cutlim = ((int)((unsigned long)ULONG_MAX % (unsigned long)base));
+	cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
 	for (acc = 0, any = 0;; c = *s++) {
 		if (isdigit(c)) {
 			c -= '0';
@@ -350,7 +351,7 @@
 	 */
 	qbase = (unsigned)base;
 	cutoff = neg ? -(u_quad_t)QUAD_MIN : QUAD_MAX;
-	cutlim = ((int)(cutoff % qbase));
+	cutlim = cutoff % qbase;
 	cutoff /= qbase;
 	for (acc = 0, any = 0;; c = *s++) {
 		if (isdigit(c)) {
@@ -433,7 +434,7 @@
 	}
 	qbase = (unsigned)base;
 	cutoff = (u_quad_t)UQUAD_MAX / qbase;
-	cutlim = ((int)((u_quad_t)UQUAD_MAX % qbase));
+	cutlim = (u_quad_t)UQUAD_MAX % qbase;
 	for (acc = 0, any = 0;; c = *s++) {
 		if (isdigit(c)) {
 			c -= '0';
@@ -469,3 +470,29 @@
 
 	return acc;
 }
+
+
+/*
+ *
+ */
+
+char *
+strncat(char *s1, const char *s2, unsigned long n)
+{
+	if (n != 0) {
+		char *d = s1;
+		const char *s = s2;
+
+		while (*d != 0) {
+			d++;
+		}
+		do {
+			if ((*d = *s++) == '\0') {
+				break;
+			}
+			d++;
+		} while (--n != 0);
+		*d = '\0';
+	}
+	return s1;
+}