Update the heap allocator.

1 files changed, 3 insertions, 2 deletions

diff --git a/heap.c b/heap.c
index 586bdfc..3f4fb91 100644
--- a/heap.c
+++ b/heap.c
@@ -82,10 +82,11 @@ static uintptr_t align_address(
 }
 
 static void* heap_alloc_impl(Heap* h, int size) {
-	int* header, * nh, s, f, i, as, p;
+	int* header, * nh, s, f, i, as, p, m;
 	i = 0;
 	as = size + sizeof *header;
 	p = 0;
+	m = sizeof *header - 1;
 	for (i = 0; i < h->blocks; i++) {
 		header = (int*)(h->buffer + p);
 		s = header[0];
@@ -94,7 +95,7 @@ static void* heap_alloc_impl(Heap* h, int size) {
 		if (f) {
 			/* There's no point creating blocks smaller than
 			 * the header. */
-			if (as < s - sizeof *header - 1) {
+			if (as < s - m) {
 				s -= as;
 				header[0] = (s << 1);
 				nh = (int*)(h->buffer + p + s);