Implement done command

src/db.c

@@ -95,9 +95,41 @@ int add_task(task_t t) {
     return 0;
 }
 
-int update_task(task_t t) { //TODO
-    (void)t;
+int update_task(task_t t) {
+    sqlite3* db = get_db();
+    sqlite3_stmt* stmt;
+
+    int ret = sqlite3_prepare_v2(db, "UPDATE tasks SET text=?2, done=?3, due_to=?4 WHERE id=?1;", -1, &stmt, 0);
+
+    if (ret != SQLITE_OK) {
+        printf("(get_task) failure fetching data\n");
         return 1;
+    }
+
+    char str_id[10];
+    sprintf(str_id, "%d", (int)t.id);
+    sqlite3_bind_text(stmt, 1, str_id, -1, SQLITE_STATIC);
+    sqlite3_bind_text(stmt, 2, t.text, -1, SQLITE_STATIC);
+
+    char str_done[2]; // Just a boolean
+    sprintf(str_done, "%d", t.done);
+    sqlite3_bind_text(stmt, 3, str_done, -1, SQLITE_STATIC);
+
+    char str_due_to[15];
+    sprintf(str_due_to, "%ld", t.due_to);
+    sqlite3_bind_text(stmt, 4, str_due_to, -1, SQLITE_STATIC);
+
+
+    ret = sqlite3_step(stmt);
+
+    sqlite3_finalize(stmt);
+    sqlite3_close(db);
+
+    if (ret != SQLITE_DONE) {
+        printf("Return value: %d\n", ret);
+        return 1;
+    }
+    return 0;
 }