Add player

Makefile

@@ -7,7 +7,7 @@ LD  = ld
 RM  = rm -f
 SRCDIR = src
 OBJDIR = obj
-SRC = main.c screen.c input.c
+SRC = main.c screen.c input.c player.c
 OBJ = $(addprefix $(OBJDIR)/,$(SRC:.c=.o))
 
 default: $(OUT)

include/player.h

@@ -0,0 +1,33 @@
+#ifndef __PLAYER_H__
+#define __PLAYER_H__
+
+#include <stdbool.h>
+
+#define UP    0
+#define RIGHT 1
+#define DOWN  2
+#define LEFT  3
+
+typedef int Direction;
+typedef struct player_node_t PlayerNode;
+typedef struct player_t Player;
+
+struct player_node_t
+{
+    int x, y;
+    PlayerNode *next;
+};
+
+struct player_t
+{
+    PlayerNode *tail, *head;
+    Direction direction;
+    int score;
+};
+
+Player *playerCreate(Direction direction, int x, int y, int score);
+void playerFree(Player *player);
+
+void playerDoTick(Player *player, bool food_collision);
+
+#endif /* __PLAYER_H__ */

src/player.c

@@ -0,0 +1,58 @@
+#include "player.h"
+#include <stdlib.h>
+
+Player *playerCreate(Direction direction, int x, int y, int score)
+{
+    Player *player = (Player *)malloc(sizeof(Player));
+    PlayerNode *head = (PlayerNode *)malloc(sizeof(PlayerNode));
+
+    player->tail = head;
+    player->head = head;
+    player->score = score;
+    player->direction = direction;
+
+    head->x = x;
+    head->y = y;
+    head->next = NULL;
+}
+
+void playerFree(Player *player)
+{
+}
+
+void playerDoTick(Player *player, bool food_collision)
+{
+    PlayerNode *new_head = (PlayerNode *)malloc(sizeof(PlayerNode));
+    int head_x = player->head->x;
+    int head_y = player->head->y;
+    
+    switch(player->direction)
+    {
+        case UP:
+            new_head->x = head_x;
+            new_head->y = head_y - 1;
+            break;
+        case DOWN:
+            new_head->x = head_x;
+            new_head->y = head_y + 1;
+            break;
+        case LEFT:
+            new_head->x = head_x - 1;
+            new_head->y = head_y;
+            break;
+        case RIGHT:
+            new_head->x = head_x + 1;
+            new_head->y = head_y;
+            break;
+    }
+
+    player->head->next = new_head;
+    player->head = new_head;
+
+    if (!food_collision)
+    {
+        PlayerNode *new_tail = player->tail->next;
+        free(player->tail);
+        player->tail = new_tail;
+    }
+}