steal a linked list implementation

main.c

@@ -2,6 +2,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include "engine/todo.h"
+#include "engine/llist.h"
 
 #define MAX_TODOS 10
 #define SAVE_FILE "todos.todd"
@@ -13,11 +14,11 @@ enum Command {
   REMOVE = 'r',
   QUIT = 'q',
 
-  SERIALIZE = 's'
+  WRITE_TO_FILE = 'w',
+  LOAD_FROM_FILE = 'l',
 };
 
-TodoItem todos[MAX_TODOS];
-int todos_count = 0;
+llist *todos;
 
 void add_command_handler() {
   char title[TODO_MAX_TITLE_LENGTH];
@@ -27,28 +28,55 @@ void add_command_handler() {
   title[strlen(title) - 1] = '\0';
 
   TodoItem item = todo_create_item(title);
-  todos[todos_count] = item;
-  todos_count++;
+  if (llist_length(todos) == 0) {
+    todos = llist_create(&item);
+  } else {
+    llist_push(todos, &item);
+  }
 }
 
-void print_all_todos() {
-  for (int i = 0; i < todos_count; i++) {
-    todo_print_item(&todos[i]);
-  }
+void mark_command_handler() {
+  int op_index = -1;
+  do {
+    printf("Enter todo index: ");
+    op_index = getc(stdin) - '0';
+    getc(stdin); // remove the newline character from the buffer
+  } while (op_index < 0 || op_index >= llist_length(todos));
+
+  todo_mark_item(todos[op_index]->item, !todos[op_index]->item->completed);
+}
+
+void print_command_handler() {
+  llist_print(todos, todo_print_item);
 }
 
 void remove_todo_at_index(int index) {
-  for (int i = index; i < todos_count - 1; i++) {
-    todos[i] = todos[i + 1];
+  // TODO!: Implement this
+  /* for (int i = index; i < todos_count - 1; i++) { */
+  /*   todos[i] = todos[i + 1]; */
+  /* } */
+  /* todos_count--; */
+}
+
+void write_to_file_handler() {
+  FILE *file = fopen(SAVE_FILE, "wb");
+  int todos_count = llist_length(todos);
+  int bs = 0;
+  // write a magic value "TODD" to the file
+  fwrite("TODD", sizeof(char), 4, file);
+  // write the number of todos to the file
+  fwrite(&todos_count, sizeof(int), 1, file);
+  // write each todo to the file
+  for (int i = 0; i < todos_count; i++) {
+    char *buffer = todo_item_serialize(todos[i]->item, &bs);
+    fwrite(buffer, sizeof(char), bs, file);
+    free(buffer);
   }
-  todos_count--;
+  fclose(file);
 }
 
 int main(int argc, char **argv) {
   char cmd;
-  int op_index = -1;
-  int bs;
-  FILE *file;
 
   do {
     printf("Enter command: ");
@@ -57,43 +85,22 @@ int main(int argc, char **argv) {
 
     switch (cmd) {
       case ADD:
-        if (todos_count + 1 > MAX_TODOS) {
+        if (llist_length(todos) + 1 > MAX_TODOS) {
           printf("No more space for new todos\n");
           break;
         }
         add_command_handler();
         break;
       case MARK:
-        do {
-          printf("Enter todo index: ");
-          op_index = getc(stdin) - '0';
-          getc(stdin); // remove the newline character from the buffer
-        } while (op_index < 0 || op_index >= todos_count);
-        todo_mark_item(&todos[op_index], !todos[op_index].completed);
+        mark_command_handler();
         break;
       case PRINT:
-        print_all_todos();
+        print_command_handler();
         break;
       case REMOVE:
-        do {
-          printf("Enter todo index: ");
-          op_index = getc(stdin) - '0';
-          getc(stdin); // remove the newline character from the buffer
-        } while (op_index < 0 || op_index >= todos_count);
-        remove_todo_at_index(op_index);
-      case SERIALIZE:
-        file = fopen(SAVE_FILE, "wb");
-        // write a magic value "TODD" to the file
-        fwrite("TODD", sizeof(char), 4, file);
-        // write the number of todos to the file
-        fwrite(&todos_count, sizeof(int), 1, file);
-        // write each todo to the file
-        for (int i = 0; i < todos_count; i++) {
-          char *buffer = todo_item_serialize(&todos[i], &bs);
-          fwrite(buffer, sizeof(char), bs, file);
-          free(buffer);
-        }
-        fclose(file);
+        break;
+      case WRITE_TO_FILE:
+        write_to_file_handler();
         break;
       case QUIT:
         break;
@@ -104,7 +111,11 @@ int main(int argc, char **argv) {
 
   } while (cmd != QUIT);
 
+  // free all the todos
+  int todos_count = llist_length(todos);
+
   for (int i = 0; i < todos_count; i++) {
-    todo_free_item(&todos[i]);
+    todo_free_item(todos[i]->item);
+    llist_pop(todos);
   }
 }