/**
 * student-compare.c
 *   Some simple comparators for students.
 */

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

#include <string.h>

#include "student.h"
#include "student-compare.h"


// +-------------+----------------------------------------------------
// | Comparators |
// +-------------+

int 
compare_students_by_debt (struct student *s, struct student *t)
{
  if (s->debt < t->debt)
    return -1;
  else if (s->debt > t->debt)
    return 1;
  else
    return 0;
} // compare_students_by_debt

int
compare_students_by_gpa (struct student *s, struct student *t)
{
  if (s->gpa < t->gpa)
    return -1;
  else if (s->gpa > t->gpa)
    return 1;
  else
    return 0;
} // compare_students_by_gpa

int 
compare_students_by_name (struct student *s, struct student *t)
{
  int lcmp = strcmp (s->lname, t->lname);
  // Normal case: Different last names
  if (lcmp)
    return lcmp;
  // Special case: Identical last names
  else
    return strcmp (s->fname, t->fname);
} // compare_students_by_name

int 
compare_students_by_student_id (struct student *s, struct student *t)
{
  return strcmp (s->sid, t->sid);
} // compare_students_by_student_id