#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "student.h"

#define MAXIMUM_LENGTH 80
/* You may use this constant in at most one place in this program */
/* You will use 1 point (25% of the full score) if you use it in two
   or more places */

/* You MUST NOT use any constant, such as 65 or 97, below.  If you
 * need a constant, you must declare a symbol above.  You will lose
 * one point (25% of the full score) for each occurrence of a numeric
 * constant below.  
 * 
 * Reason: unexplained constants make programs difficult to understand
 * and difficult to debug.  When you write 96, what does it mean? Does
 * it mean 97 - 1 (the character before 'a')? Does it mean 3 * 32?
 */

/* 
 * You CANNOT use while, for, goto or anything similar in this
 * program.  If you need to traverse a linked list, you need to use
 * recursion.
 */

/*
 * ================================================
 */

Student * readStudent(char * infile)
/*
 * This function opens the file whose name is given as the
 * argument. If the file cannot be opened, the function returns NULL.
 * You must use NULL.  Do not use the numeric value 0 becaue they have
 * different meanings.
 *
 * If the file is opened successfully, the function reads the records.
 * Each student has an ID (integer) and a name (string).  For
 * simplicity, each student's name is only one string, not two for
 * first name and last name.  Each student's record uses one line;
 * i.e., two students use two differnet lines.
 * 
 * It is possible that a line has no record.  Please be careful that
 * this "empty" line may contain space or invisible characters. Your
 * program should discard the lines that do not include an integer and
 * a string.
 *
 * The program stores the students' records in a linked list.  You do
 * not have to sort the record inside this function.
 *
 * This function returns the first node of the linked list.  Please
 * remember a valid linked list should end with NULL.
 *
 */
{
  return NULL;
}

/*
 * ================================================
 */

int writeStudent(char * outfile, Student * stu)
/*
 * This function opens the file whose name is given as the first
 * argument. If the file cannot be opened, the function returns
 * EXIT_FAILURE.
 *
 * The second argument is the first node of a linked list. 
 *
 * If the file is opened successfully, the function writes the
 * students' records to the file, one student per line, in
 * the order of the linked list.
 *
 * This function must not write any empty line.
 *
 * The function closes the file and returns EXIT_SUCCESS.
 */
{
  return EXIT_FAILURE;
}

/*
 * ================================================
 */
Student * sortStudentbyID(Student * stu)
{
  return stu;
}

Student * sortStudentbyName(Student * stu)
{
  return stu;
}

void freeStudent(Student * stu)
{
}