Initialization

cv9/snake/snake.c

@@ -2,17 +2,52 @@
 #include <stdlib.h>
 
 struct snake* add_snake(struct snake* snake,int x,int y){
-    return NULL;
+    struct snake* head = calloc(1,sizeof(struct snake));
+    head->x = x;
+    head->y = y;
+    head->next = snake;
+    return head;
 }
 
-struct snake* remove_snake(struct snake* snake){
+struct snake* remove_snake(struct snake* snake) {
+    if (snake == NULL) {
         return NULL;
+    }
+
+    if (snake->next == NULL) {
+        free(snake);
+        return NULL;
+    }
+
+    struct snake* current = snake;
+    while (current->next->next != NULL) {
+        current = current->next;
+    }
+
+    free(current->next);
+    current->next = NULL;
+
+    return snake;
 }
 
-void free_snake(struct snake* sn){
+void free_snake(struct snake* sn) {
+    struct snake* current = sn;
+    struct snake* next;
+
+    while (current!= NULL) {
+        next = current->next;
+        free(current);
+        current = next;
+    }
 }
 
 int is_snake(struct snake* snake,int x,int y){
+    while (snake != NULL) {
+        if (snake->x == x && snake->y == y) {
+            return 1;
+        }
+        snake = snake->next;
+    }
     return 0;
 }