static size_t UTF8ToUTF16(const unsigned char *utf8,wchar_t *utf16)
{
  register const unsigned char
    *p;

  if (utf16 != (wchar_t *) NULL)
    {
      register wchar_t
        *q;

      wchar_t
        c;

      /*
        Convert UTF-8 to UTF-16.
      */
      q=utf16;
      for (p=utf8; *p != '\0'; p++)
      {
        if ((*p & 0x80) == 0)
          *q=(*p);
        else
          if ((*p & 0xE0) == 0xC0)
            {
              c=(*p);
              *q=(c & 0x1F) << 6;
              p++;
              if ((*p & 0xC0) != 0x80)
                return(0);
              *q|=(*p & 0x3F);
            }
          else
            if ((*p & 0xF0) == 0xE0)
              {
                c=(*p);
                *q=c << 12;
                p++;
                if ((*p & 0xC0) != 0x80)
                  return(0);
                c=(*p);
                *q|=(c & 0x3F) << 6;
                p++;
                if ((*p & 0xC0) != 0x80)
                  return(0);
                *q|=(*p & 0x3F);
              }
            else
              return(0);
        q++;
      }
      *q++=(wchar_t) '\0';
      return((size_t) (q-utf16));
    }
  /*
    Compute UTF-16 string length.
  */
  for (p=utf8; *p != '\0'; p++)
  {
    if ((*p & 0x80) == 0)
      ;
    else
      if ((*p & 0xE0) == 0xC0)
        {
          p++;
          if ((*p & 0xC0) != 0x80)
            return(0);
        }
      else
        if ((*p & 0xF0) == 0xE0)
          {
            p++;
            if ((*p & 0xC0) != 0x80)
              return(0);
            p++;
            if ((*p & 0xC0) != 0x80)
              return(0);
         }
       else
         return(0);
  }
  return((size_t) (p-utf8));
}

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.