# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <time.h>

# include "atbash.h"

/******************************************************************************/

int main ( )

/******************************************************************************/
/*
  Purpose:

    atbash_test() tests atbash_encrypt().

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    20 March 2018

  Author:

    John Burkardt
*/
{
  timestamp ( );

  printf ( "\n" );
  printf ( "atbash_test():\n" );
  printf ( "  C version\n" );
  printf ( "  atbash_encrypt() encrypts a plain text using the atbash\n" );
  printf ( "  substitution cipher.\n" );

  atbash_test01 ( );
  atbash_test02 ( );
/*
  Terminate.
*/
  printf ( "\n" );
  printf ( "atbash_test():\n" );
  printf ( "  Normal end of execution.\n" );
  printf ( "\n" );
  timestamp ( );

  return 0;
}
/******************************************************************************/

void atbash_test01 ( )

/******************************************************************************/
/*
  Purpose:

    atbash_test01() tests atbash_encrypt() with a short phrase.

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    20 March 2018

  Author:

    John Burkardt
*/
{
  char *crypt;
  char *decrypt;
  char *plain = "A man, a plan, a canal - Panama!";

  printf ( "\n" );
  printf ( "atbash_test01():\n" );
  printf ( "  Apply atbash_encrypt() to a short phrase.\n" );

  crypt = atbash_encrypt ( plain );
  decrypt = atbash_encrypt ( crypt );
  printf ( "\n" );
  printf ( "  PLAIN:   '%s'\n", plain );
  printf ( "  CRYPT:   '%s'\n", crypt );
  printf ( "  DECRYPT: '%s'\n", decrypt );
/*
  Free memory.
*/
  free ( crypt );
  free ( decrypt );

  return;
}
/******************************************************************************/

void atbash_test02 ( )

/******************************************************************************/
/*
  Purpose:

    atbash_test02() tests atbash_encrypt() with another phrase.

  Licensing:

    This code is distributed under the MIT license.

  Modified:

    20 March 2018

  Author:

    John Burkardt
*/
{
  char *crypt;
  char *decrypt;
  char *plain = "There are a thousand hacking at the branches of evil for every one who is striking at its root.";

  printf ( "\n" );
  printf ( "atbash_test02():\n" );
  printf ( "  Apply atbash_encrypt() to a longer phrase.\n" );

  crypt = atbash_encrypt ( plain );
  decrypt = atbash_encrypt ( crypt );

  printf ( "\n" );
  printf ( "  PLAIN:   '%s'\n", plain );
  printf ( "  CRYPT:   '%s'\n", crypt );
  printf ( "  DECRYPT: '%s'\n", decrypt );
/*
  Free memory.
*/
  free ( crypt );
  free ( decrypt );

  return;
}
/******************************************************************************/

void timestamp ( )

/******************************************************************************/
/*
  Purpose:

    timestamp() prints the current YMDHMS date as a time stamp.

  Example:

    17 June 2014 09:45:54 AM

  Licensing:

    This code is distributed under the MIT license. 

  Modified:

    17 June 2014

  Author:

    John Burkardt
*/
{
# define TIME_SIZE 40

  static char time_buffer[TIME_SIZE];
  const struct tm *tm;
  time_t now;

  now = time ( NULL );
  tm = localtime ( &now );

  strftime ( time_buffer, TIME_SIZE, "%d %B %Y %I:%M:%S %p", tm );

  printf ( "%s\n", time_buffer );

  return;
# undef TIME_SIZE
}