/**
 * myio.c - Declarations of simple I/O functions.
 *   Based closely on code taken from section 4.3 of K&R.
 *   Error checking removed because error messages should go to client,
 *     not to user.
 */

// +---------+--------------------------------------------------------
// | Headers |
// +---------+

#include <stdio.h>	// For fprintf, getchar
#include "myio.h"


// +-----------+------------------------------------------------------
// | Constants |
// +-----------+

/**
 * The maximum number of characters we can "unread".
 */
#define BUFSIZE 128


// +---------+--------------------------------------------------------
// | Globals |
// +---------+

/**
 * The buffer in which we store unread characters.
 */
int buf[BUFSIZE];

/**
 * The position in the buffer that stores the most-recently unread
 * character.  (When 0, there is no most-recently unread character.)
 */
int bufp = 0;


// +--------------------+---------------------------------------------
// | Exported Functions |
// +--------------------+

int 
getch ()
{
  return (bufp > 0) ? buf[--bufp] : getchar ();
} // getch

void 
ungetch (int c)
{
  buf[bufp++] = c;
} // ungetch