From 56ca69777ed08fd367d523fc9a35a193263bb700 Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Tue, 21 Apr 2026 21:25:48 +0300
Subject: fix(B_resize): Fix size calculations and setting

---
 BumpAlloc.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/BumpAlloc.c b/BumpAlloc.c
index 77f2bb7..0c9163c 100644
--- a/BumpAlloc.c
+++ b/BumpAlloc.c
@@ -87,13 +87,12 @@ B_resize(BumpArena bp, usize size) {
 
     usize last_size = *top_size(b);
     usize start = b->top - last_size;
-    if (start > 0)
-        start -= sizeof(usize);
 
     if (start + size + sizeof(usize) > b->size)
         return R_OutOfBounds;
 
-    b->top += size;
+    *top_size(b) = 0;
+    b->top = start + size;
     *top_size(b) = size;
 
     return R_Ok;
-- 
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