f

include/engine.h

@@ -26,14 +26,12 @@ set(vec2* vec2, int _x, int _y);
 
 typedef struct
 {
-	unsigned char view[ROW][COL];
-	vec2 head;
-	vec2 fruit;
-	vec2 prev_head;
-	int m_score;
+	char view[ROW][COL];
+	int m_score, tail_size;
+	vec2 head, fruit, prev_head;
+	vec2 tail[(ROW * COL) - 1];
+	// vec2* tail[(ROW * COL) - 1];
 	Direction dir;
-	vec2* tail[(ROW * COL) - 1];
-	int tail_size;
 
 } Engine;
 
@@ -50,13 +48,9 @@ int
 is_open(char* status, size_t len, Engine* engine);
 
 void
-determine_index_zero_pos(Engine* engine);
+eat(Engine* engine);
 
 void
-add_tail_and_respawn_fruit(Engine* engine);
-
-void
-move_tail_indicies(vec2** tail, int tail_size, vec2* prev_head,
-		   unsigned char (*view)[COL]);
+move(Engine *engine);
 
 #endif

src/engine.c

@@ -3,7 +3,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <termios.h>
 #include <time.h>
 #include <unistd.h>
 
@@ -50,24 +49,30 @@ engine_display(Engine* engine)
 	{
 		for (char i = 0; i < engine->tail_size; i++)
 		{
-			if (engine->tail[i]->x < COL &&
-			    engine->tail[i]->y < ROW)
+			if (engine->tail[i].x < COL &&
+			    engine->tail[i].y < ROW)
 			{
-				engine->view[engine->tail[i]->y]
-					    [engine->tail[i]->x] = '~';
+				engine->view[engine->tail[i].y]
+					    [engine->tail[i].x] = '~';
 			}
 		}
 	}
 	write(1, "\033[H\033[J", sizeof("\033[H\033[J") - 1);
-	for (unsigned char i = 0; i < ROW; i++)
+	char str[(COL * 2 + 2) * ROW] = { 0 };
+	char* ptr = str;
+	for (char i = 0; i < ROW; i++)
 	{
-		for (unsigned char j = 0; j < COL; j++)
+		for (char j = 0; j < COL; j++)
 		{
-			write(1, &engine->view[i][j], 1);
-			write(1, " ", 1);
+			memcpy(ptr, " ", 1);
+			ptr++;
+			memcpy(ptr, &engine->view[i][j], 1);
+			ptr++;
 		}
-		write(1, "\r\n", 2);
+		memcpy(ptr, "\r\n", 2);
+		ptr += 2;
 	}
+	write(1, str, ptr - str);
 }
 
 int
@@ -92,7 +97,7 @@ process_input(Direction* dir)
 int
 is_open(char* status, size_t len, Engine* engine)
 {
-	if ((sizeof(engine->tail) / sizeof(engine->tail[0])) >= ROW * COL)
+	if (engine->tail_size >= (ROW * COL) - 1)
 	{
 		snprintf(status, len,
 			 "You filled the whole board and won! "
@@ -102,7 +107,7 @@ is_open(char* status, size_t len, Engine* engine)
 	}
 	for (int i = 0; i < engine->tail_size; i++)
 	{
-		if (equals(engine->tail[i], &engine->head))
+		if (equals(&engine->tail[i], &engine->head))
 		{
 			snprintf(status, len,
 				 "You collided with yourself and died! "
@@ -115,7 +120,7 @@ is_open(char* status, size_t len, Engine* engine)
 }
 
 void
-determine_index_zero_pos(Engine* engine)
+move(Engine* engine)
 {
 	set(&engine->prev_head, engine->head.x, engine->head.y);
 
@@ -129,26 +134,20 @@ determine_index_zero_pos(Engine* engine)
 		engine->head.y = (engine->head.y + 1) % ROW;
 	engine->view[engine->prev_head.y][engine->prev_head.x] = '.';
 	engine->view[engine->head.y][engine->head.x] = '*';
+
+	if (engine->tail_size == 0) return;
+
+	vec2 old_tail = engine->tail[engine->tail_size -1];
+	memmove(&engine->tail[1], &engine->tail[0], sizeof(vec2) * (engine->tail_size - 1));
+
+	engine->view[old_tail.y]
+		    [old_tail.x] = '.';
+	set(&engine->tail[0], engine->prev_head.x, engine->prev_head.y);
 }
 
 void
-move_tail_indicies(vec2** tail, int tail_size, vec2* prev_head,
-		   unsigned char (*view)[COL])
+eat(Engine* engine)
 {
-	if (tail_size == 0) return;
-
-	view[tail[tail_size - 1]->y][tail[tail_size - 1]->x] = '.';
-	for (int i = tail_size - 1; i > 0; i--)
-	{
-		set(tail[i], tail[i - 1]->x, tail[i - 1]->y);
-	}
-	set(tail[0], prev_head->x, prev_head->y);
-}
-
-void
-add_tail_and_respawn_fruit(Engine* engine)
-{
-	if (!equals(&engine->fruit, &engine->head)) return;
 	vec2 new_pos;
 	set(&new_pos, 0, 0);
 	int collision = 0;
@@ -159,22 +158,20 @@ add_tail_and_respawn_fruit(Engine* engine)
 		if (equals(&new_pos, &engine->head))
 		{
 			collision = 1;
-			break;
 		}
 		if (engine->tail_size > 0)
 		{
 			for (int i = 0; i < engine->tail_size; i++)
 			{
-				if (equals(&new_pos, engine->tail[i]))
+				if (equals(&new_pos, &engine->tail[i]))
 				{
 					collision = 1;
-					break;
 				}
 			}
 		}
 	} while (collision);
 	engine->fruit = new_pos;
-	engine->tail[engine->tail_size] = (vec2*)malloc(sizeof(vec2));
+	set(&engine->tail[engine->tail_size], -1, -1);
 	engine->tail_size++;
 	engine->m_score++;
 }

src/main.c

@@ -25,16 +25,17 @@ main()
 
 	while (is_open(status, 64, &engine) && process_input(&engine.dir))
 	{
-		add_tail_and_respawn_fruit(&engine);
-		determine_index_zero_pos(&engine);
-		move_tail_indicies(engine.tail, engine.tail_size, &engine.prev_head, engine.view);
 
+		if(equals(&engine.fruit, &engine.head)) {
+			eat(&engine);
+		}
+		move(&engine);
 		engine_display(&engine);
 		nanosleep(&req, NULL);
 	}
-	for(int i = 0; i < engine.tail_size; i++) {
-		free(engine.tail[i]);
-	}
+	// for(int i = 0; i < engine.tail_size; i++) {
+	// 	free(engine.tail[i]);
+	// }
 	write(1, status, sizeof(status));
 	write(1, "\033[?25h", 6);
 	tcsetattr(0, TCSANOW, &oldt);