From 8cdfe4829bee3b7d4fcb640ed698de36858f46d7 Mon Sep 17 00:00:00 2001
From: Kevin Trogant <kevin_trog@proton.me>
Date: Thu, 8 Jan 2026 18:13:16 +0100
Subject: [PATCH] MakeArena util

---
 rtcore.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/rtcore.h b/rtcore.h
index 09440a4..321c585 100644
--- a/rtcore.h
+++ b/rtcore.h
@@ -153,6 +153,20 @@ typedef struct arena_cp
 	byte *cp;
 } arena_cp;
 
+static force_inline arena
+MakeArena(void *base, isize cap)
+{
+	return (cap > 0 && base != NULL) ?
+		(arena){
+			.begin = (byte *)base,
+			.end = (byte *)base + cap,
+		} :
+		(arena){
+			.begin = NULL,
+			.end = NULL
+		};
+}
+
 static force_inline arena_cp
 SaveArena(arena a)
 {