From 07ff6134787a7729a86480eb86cc80a15cce5eae Mon Sep 17 00:00:00 2001
From: ma-moon <100507036+ma-moon@users.noreply.github.com>
Date: Sat, 2 May 2026 14:50:10 +0800
Subject: [PATCH] fix: arena_memdup accept const void* (fixes #13)

---
 arena.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arena.h b/arena.h
index 7ec4c8f..64c44c4 100644
--- a/arena.h
+++ b/arena.h
@@ -72,7 +72,7 @@ void free_region(Region *r);
 void *arena_alloc(Arena *a, size_t size_bytes);
 void *arena_realloc(Arena *a, void *oldptr, size_t oldsz, size_t newsz);
 char *arena_strdup(Arena *a, const char *cstr);
-void *arena_memdup(Arena *a, void *data, size_t size);
+void *arena_memdup(Arena *a, const void *data, size_t size);
 void *arena_memcpy(void *dest, const void *src, size_t n);
 #ifndef ARENA_NOSTDIO
 char *arena_sprintf(Arena *a, const char *format, ...);
@@ -356,7 +356,7 @@ char *arena_strdup(Arena *a, const char *cstr)
     return dup;
 }
 
-void *arena_memdup(Arena *a, void *data, size_t size)
+void *arena_memdup(Arena *a, const void *data, size_t size)
 {
     return arena_memcpy(arena_alloc(a, size), data, size);
 }