From 3870982f640260822bf605e693782ce9f5d79cf6 Mon Sep 17 00:00:00 2001
From: Joel Stålnacke <joel@saker.fi>
Date: Fri, 20 Mar 2026 21:38:46 +0200
Subject: Get a player drawing on screen

---
 lib/snapshot.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 56 insertions(+), 13 deletions(-)

(limited to 'lib/snapshot.c')

diff --git a/lib/snapshot.c b/lib/snapshot.c
index 88c17a1..d7dde50 100644
--- a/lib/snapshot.c
+++ b/lib/snapshot.c
@@ -1,14 +1,51 @@
+#include <stdlib.h>
 #include <string.h>
 
 #include "common.h"
 
 #include "snapshot.h"
 
-int dp_snapshot_put_player(struct snapshot *s, uint32_t id, const struct player *p)
+int
+dp_snapshot_init(struct snapshot *s, int32_t players_len, int32_t balls_len)
+{
+	if (!s)
+		return -1;
+
+	if (!(s->players = calloc(players_len, sizeof(*s->players))))
+		return -1;
+	if (!(s->balls = calloc(balls_len, sizeof(*s->balls))))
+	{
+		free(s->players);
+		return -1;
+	}
+	s->players_len = players_len;
+	s->balls_len = balls_len;
+	return 0;
+}
+
+void
+dp_snapshot_deinit(struct snapshot *s)
+{
+	if (!s)
+		return;
+	if (s->players)
+	{
+		free(s->players);
+		s->players = NULL;
+	}
+	if (s->balls)
+	{
+		free(s->balls);
+		s->balls = NULL;
+	}
+}
+
+int
+dp_snapshot_put_player(struct snapshot *s, int32_t id, const struct player *p)
 {
 	if (!s || !p)
 		return -1;
-	if (id >= LENGTH(s->players))
+	if (id >= s->players_len)
 		return -1;
 
 	s->players[id] = *p;
@@ -16,13 +53,14 @@ int dp_snapshot_put_player(struct snapshot *s, uint32_t id, const struct player
 	return 0;
 }
 
-struct player *dp_snapshot_get_player(struct snapshot *s, uint32_t id)
+struct player *
+dp_snapshot_get_player(struct snapshot *s, int32_t id)
 {
 	struct player *p;
 
 	if (!s)
 		return NULL;
-	if (id >= LENGTH(s->players))
+	if (id >= s->players_len)
 		return NULL;
 
 	p = &s->players[id];
@@ -31,13 +69,14 @@ struct player *dp_snapshot_get_player(struct snapshot *s, uint32_t id)
 	return p;
 }
 
-int dp_snapshot_remove_player(struct snapshot *s, uint32_t id)
+int
+dp_snapshot_remove_player(struct snapshot *s, int32_t id)
 {
 	struct player *p;
 
 	if (!s)
 		return -1;
-	if (id >= LENGTH(s->players))
+	if (id >= s->players_len)
 		return -1;
 
 	p = dp_snapshot_get_player(s, id);
@@ -46,7 +85,8 @@ int dp_snapshot_remove_player(struct snapshot *s, uint32_t id)
 	return 0;
 }
 
-int dp_snapshot_set_player_input(struct snapshot *s, uint32_t id, uint8_t input)
+int
+dp_snapshot_set_player_input(struct snapshot *s, int32_t id, uint8_t input)
 {
 	struct player *p;
 
@@ -56,11 +96,12 @@ int dp_snapshot_set_player_input(struct snapshot *s, uint32_t id, uint8_t input)
 	return 0;
 }
 
-int dp_snapshot_put_ball(struct snapshot *s, uint32_t id, const struct ball *b)
+int
+dp_snapshot_put_ball(struct snapshot *s, int32_t id, const struct ball *b)
 {
 	if (!s || !b)
 		return -1;
-	if (id >= LENGTH(s->balls))
+	if (id >= s->balls_len)
 		return -1;
 
 	s->balls[id] = *b;
@@ -68,13 +109,14 @@ int dp_snapshot_put_ball(struct snapshot *s, uint32_t id, const struct ball *b)
 	return 0;
 }
 
-struct ball *dp_snapshot_get_ball(struct snapshot *s, uint32_t id)
+struct ball *
+dp_snapshot_get_ball(struct snapshot *s, int32_t id)
 {
 	struct ball *b;
 
 	if (!s)
 		return NULL;
-	if (id >= LENGTH(s->balls))
+	if (id >= s->balls_len)
 		return NULL;
 
 	b = &s->balls[id];
@@ -83,13 +125,14 @@ struct ball *dp_snapshot_get_ball(struct snapshot *s, uint32_t id)
 	return b;
 }
 
-int dp_snapshot_remove_ball(struct snapshot *s, uint32_t id)
+int
+dp_snapshot_remove_ball(struct snapshot *s, int32_t id)
 {
 	struct ball *b;
 
 	if (!s)
 		return -1;
-	if (id >= LENGTH(s->balls))
+	if (id >= s->balls_len)
 		return -1;
 
 	b = dp_snapshot_get_ball(s, id);
-- 
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