1 files changed, 37 insertions, 0 deletions
diff --git a/src/core/std_allocator.c b/src/core/std_allocator.c
new file mode 100644
index 0000000..ecfa806
--- /dev/null
+++ b/src/core/std_allocator.c
@@ -0,0 +1,37 @@
+#include "std_allocator.h"
+
+#include <stdlib.h>
+
+static void *allocate(size_t size, size_t alignment, void *user_data) {
+	(void)user_data;
+
+	// `aligned_alloc(3)` requires that the requested size be a multiple of the requested alignment.
+	// this is safe to do, because we ignore `old_size` everywhere else.
+	size_t actual_size = (size + alignment - 1) & ~(alignment - 1);
+
+	return aligned_alloc(alignment, actual_size);
+}
+
+static void deallocate(void *old_ptr, size_t old_size, void *user_data) {
+	(void)old_size;
+	(void)user_data;
+	free(old_ptr);
+}
+
+static void *reallocate(void *old_ptr, size_t old_size, size_t new_size, size_t alignment, void *user_data) {
+	(void)old_size;
+	(void)alignment;
+	(void)user_data;
+
+	// fixme: does `realloc(3)` preserve alignment?
+	return realloc(old_ptr, new_size);
+}
+
+SandAllocator sand_new_std_allocator() {
+	return (SandAllocator) {
+		.allocate = allocate,
+		.deallocate = deallocate,
+		.reallocate = reallocate,
+		.user_data = NULL,
+	};
+}