--- /dev/null
+++ Libc/Libc-825.24/string/stpncpy.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2011 Apple, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <string.h>
+
+char *
+stpncpy(char * restrict dst, const char * restrict src, size_t maxlen) {
+    const size_t srclen = strnlen(src, maxlen);
+    if (srclen < maxlen) {
+        //  The stpncpy() and strncpy() functions copy at most maxlen
+        //  characters from src into dst.
+        memcpy(dst, src, srclen);
+        //  If src is less than maxlen characters long, the remainder
+        //  of dst is filled with '\0' characters.
+        memset(dst+srclen, 0, maxlen-srclen);
+        //  The stpcpy() and stpncpy() functions return a pointer to the
+        //  terminating '\0' character of dst.
+        return dst+srclen;
+    } else {
+        //  The stpncpy() and strncpy() functions copy at most maxlen
+        //  characters from src into dst.
+        memcpy(dst, src, maxlen);
+        //  If stpncpy() does not terminate dst with a NUL character, it
+        //  instead returns a pointer to src[maxlen] (which does not
+        //  necessarily refer to a valid memory location.)
+        return dst+maxlen;
+    }
+}