From e5e6a8650a5ec4ef9ed73c9b7a31551258849f15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Thu, 21 Jan 2021 11:44:06 +0100
Subject: implement the functions

---
 main.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 56 insertions(+), 5 deletions(-)

diff --git a/main.c b/main.c
index c0273a4..ae9910b 100644
--- a/main.c
+++ b/main.c
@@ -35,21 +35,72 @@ int read_int() {
 	return res;
 }
 
-void insert (struct list *student_list) {
+// Fetch a student name from the terminal input and add it to the list.
+void insert(struct list *student_list) {
+	struct student *student = malloc(sizeof(struct student));
+	char *name = read_input();
+	if (!name) {
+		printf("Failed to read student name\n");
+		free(student);
+	} else {
+		student->name = name;
+		printf("Inserted student with name '%s'\n", student->name);
+		list_push_front(student_list, &student->elem);
+	}
 }
 
-void delete (struct list *student_list) {
+// Get a student name from the terminal input, remove it from the list and
+// deallocate the appropriate memory (if needed).
+void delete(struct list *student_list) {
+	char *name = read_input();
+	if (!name) {
+		printf("Failed to read student name\n");
+	} else {
+		struct list_elem *e;
+		for (e = list_begin(student_list); e != list_end(student_list);
+			 e = list_next(e))
+		{
+			struct student *student = list_entry(e, struct student, elem);
+			if (strcmp(student->name, name) == 0) {
+				printf("Removing student '%s'\n", student->name);
+				list_remove(&student->elem);
+				free(student->name);
+				free(student);
+				break;
+			}
+		}
+	}
+	free(name);
 }
 
-void list (struct list *student_list) {
+// Print the entire list.
+void list(struct list *student_list) {
+	struct list_elem *e;
+	for (e = list_begin(student_list); e != list_end(student_list);
+		 e = list_next(e))
+	{
+		struct student *student = list_entry(e, struct student, elem);
+		printf("Student: %s\n", student->name);
+	}
 }
 
-void quit (struct list *student_list) {
+// Clear the list and deallocate the memory.
+void quit(struct list *student_list) {
+	struct list_elem *e;
+	struct student *student;
+	while (!list_empty(student_list)) {
+		e = list_pop_front(student_list);
+		student = list_entry(e, struct student, elem);
+		printf("Removing '%s'\n", student->name);
+		free(student->name);
+		free(student);
+	}
+	exit(0);
 }
 
 int main() {
 	struct list student_list;
-	list_init (&student_list);
+	list_init(&student_list);
 	int opt;
 
 	do {
-- 
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