fix arena_realloc() zeroing memory

1 files changed, 3 insertions, 3 deletions

diff --git a/arena.h b/arena.h
index 58c9d38..8e8b145 100644
--- a/arena.h
+++ b/arena.h
@@ -5,6 +5,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+#include <string.h>
 
 typedef struct {
 	char *start; /* need to release memory */
@@ -24,10 +25,10 @@ void *arena_alloc(Arena *a, size_t n, size_t align);
 void *arena_realloc(Arena *a, void *old, size_t oldsz, size_t newsz, size_t align);
 
 #define new(a, t)\
-    arena_alloc(a, sizeof(t), _Alignof(__typeof__(t)))
+    memset(arena_alloc(a, sizeof(t), _Alignof(__typeof__(t))), 0, sizeof(t))
 
 #define new_arr(a, t, n)\
-    arena_alloc(a, sizeof(t) * (n), _Alignof(__typeof__(t)))
+    memset(arena_alloc(a, sizeof(t) * (n), _Alignof(__typeof__(t))), 0, sizeof(t) * (n))
 
 #define resize(a, x, osz, nsz)\
     arena_realloc(a, x, sizeof(*(x)) * (osz),\
@@ -67,7 +68,6 @@ void *arena_alloc(Arena *a, size_t sz, size_t align) {
 	char *p = a->beg + (-(uintptr_t)a->beg & (align - 1));
 	if (p >= a->end) FAIL_WITH_MSG("arena out-of-memory");
 	a->beg = p + sz;
-	memset(p, 0, sz);
 	return p;
 }