pvjc25/du5/snake.c

58 lines
1.2 KiB
C

#include "snake.h"
#include <stdlib.h>
struct snake* add_snake(struct snake* snake, int x, int y) {
struct snake* head = calloc(1, sizeof(struct snake));
if (head == NULL) {
return NULL; // Handle memory allocation failure
}
head->x = x;
head->y = y;
head->next = snake;
return head;
}
struct snake* remove_snake(struct snake* snake) {
if (snake == NULL) {
return NULL;
}
if (snake->next == NULL) {
free(snake);
return NULL;
}
struct snake* this = snake;
struct snake* prev = NULL;
while (this->next != NULL) {
prev = this;
this = this->next;
}
free(this);
prev->next = NULL;
return snake;
}
void free_snake(struct snake* sn) {
if (sn == NULL) {
return;
}
free_snake(sn->next);
free(sn);
}
int is_snake(struct snake* snake, int x, int y) {
for (struct snake* this = snake; this != NULL; this = this->next) {
if (this->x == x && this->y == y) {
return 1;
}
}
return 0;
}
int step_state(struct state* st) {
int nx = (st->snake->x + st->sx);
int ny = (st->snake->y + st->sy);
return END_CONTINUE;
}