C++17(C11)): Bounds-checking strnlen_s(), strcpy_s, strncpy_s(), strcat_s() and strncat_s()

C++17 added the bounds-checking functions strnlen_s(),strcpy_s, strncpy_s(), strcat_s() and strncat_s().

#include <cstring>
#include <iostream>
using namespace std;

int main()
{
  char   abc    [ ] = "abc";
  char   def    [ ] = "def";
  char   ghi    [ ] = {'g', 'h', 'i'};
  char   jklmnop[ ] = "jklmnop";
  char   buffer [7] = {'A', 'A', 'A', 'A', 'A', 'A', 'A'};

  cout << sizeof(abc) << " " << sizeof(def) << " " << sizeof(ghi) << " : ";
  cout << strnlen_s(abc, sizeof(abc) - 1) << " " <<
          strnlen_s(def, sizeof(def) - 1) << " " <<
          strnlen_s(ghi, sizeof(ghi) - 1) << " ";

  strcpy_s(buffer, sizeof(buffer), abc);
  cout << buffer << " ";

  buffer[6] = 'A';
  strncpy_s(buffer, jklmnop, sizeof(buffer) - 1);
  cout << buffer << " ";

  buffer[6] = 'A';
  strcpy_s(buffer, sizeof(buffer), abc);
  strcat_s(buffer, sizeof(buffer), def);
  cout << buffer << " ";

  buffer[6] = 'A';
  strcpy_s(buffer, sizeof(buffer), abc); // Buffer needs a '\0' in it.
  strncat_s(buffer       ,
           sizeof(buffer), 
           jklmnop       ,
           sizeof(buffer) - strnlen_s(buffer, sizeof(buffer) - 1) - 1);
  cout << buffer << " ";

  cout << endl;
  return 0;
}
// Output: 4 4 3 : 3 3 2 abc jklmno abcdef abcjkl

References:
http://en.cppreference.com/w/c/string/byte/strlen
http://en.cppreference.com/w/c/string/byte/strcpy
http://en.cppreference.com/w/c/string/byte/strncpy
http://en.cppreference.com/w/c/string/byte/strcat
http://en.cppreference.com/w/c/string/byte/strncat