text: /*
   * 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;
      }
  }
  