heap_block_size

1 files changed, 11 insertions, 0 deletions

diff --git a/qstd/memory.c b/qstd/memory.c
index f245289..6ea43f7 100644
--- a/qstd/memory.c
+++ b/qstd/memory.c
@@ -209,6 +209,17 @@ void heap_free(
 	heap_free_aligned(h, p);
 }
 
+int heap_block_size(void* ptr) {
+	unsigned char* a;
+	int f = ~((unsigned)-1 >> 1);
+	ptrdiff_t shift;
+	a = ptr;
+	shift = a[-1];
+	shift += 256 * shift == 0;
+	a -= shift;
+	return ((int*)a)[-1] & ~f;
+}
+
 /*
 void print_blocks(Heap* h) {
 	int i, o;