From b1fbb0b1c078e82a651181101fed9d6742164e0b Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Wed, 18 Aug 2021 17:01:27 -0400
Subject: char/enemy: Make a linked list of enemy chars

---
(limited to 'src/char')

diff --git a/src/char/enemy.c b/src/char/enemy.c
index fb259a2..b981da7 100644
--- a/src/char/enemy.c
+++ b/src/char/enemy.c
@@ -25,13 +25,20 @@
 #include "char.h"
 
 struct mf_enemy {
-	struct mf_char parent;
+	struct mf_char  parent;
+	struct mf_char *next_enemy;
 };
 
 static int
-_mf_enemy_update(struct mf_char *c __attribute__((__unused__)))
+_mf_enemy_update(struct mf_char *c)
 {
-	return 0;
+	struct mf_enemy *p = (struct mf_enemy *) c;
+
+	if (p->next_enemy != NULL) {
+		return mf_char_update(p->next_enemy);
+	} else {
+		return 0;
+	}
 }
 
 static int
@@ -112,19 +119,28 @@ _mf_enemy_collide(struct mf_char *c)
 }
 
 static int
-_mf_enemy_render(struct mf_char *c __attribute__((__unused__)),
-		SDL_Renderer *renderer __attribute__((__unused__)))
+_mf_enemy_render(struct mf_char *c, SDL_Renderer *renderer)
 {
-	return 0;
+	struct mf_enemy *p = (struct mf_enemy *) c;
+
+	if (p->next_enemy != NULL) {
+		return mf_char_render(p->next_enemy, renderer);
+	} else {
+		return 0;
+	}
 }
 
 static void
-_mf_enemy_destroy(struct mf_char *c __attribute__((__unused__)))
+_mf_enemy_destroy(struct mf_char *c)
 {
+	struct mf_enemy *p = (struct mf_enemy *) c;
+
+	mf_char_destroy(&p->next_enemy);
 }
 
 struct mf_char *
-mf_enemy_new(struct mf_maze *maze, int cell_width, int maze_size)
+mf_enemy_new(struct mf_maze *maze, int cell_width, int maze_size,
+		struct mf_char *prev_enemy)
 {
 	struct mf_char  *c;
 	struct mf_enemy *p __attribute__((__unused__));
@@ -163,6 +179,10 @@ mf_enemy_new(struct mf_maze *maze, int cell_width, int maze_size)
 	_mf_enemy_step(c);
 	c->cur_dir = c->new_dir;
 
+	if (prev_enemy != NULL) {
+		((struct mf_enemy *) prev_enemy)->next_enemy = c;
+	}
+
 	return c;
 }
 
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