1 files changed, 50 insertions, 0 deletions
diff --git a/libar2_erase.c b/libar2_erase.c
new file mode 100644
index 0000000..490cc4a
--- /dev/null
+++ b/libar2_erase.c
@@ -0,0 +1,50 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+#if defined(memset_s)
+#elif defined(explicit_bzero) || defined(__OpenBSD__)
+#elif defined(explicit_memset)
+#else
+# if defined(__GNUC__)
+__attribute__((visibility("hidden")))
+# endif
+void *(*const volatile libar2_internal_explicit_memset__)(void *, int, size_t) = &memset;
+#endif
+
+
+#if defined(__clang__) /* before __GNUC__ because that is also set in clang */
+# if __has_attribute(optnone)
+__attribute__((optnone))
+# endif
+#elif defined(__GNUC__)
+# if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ >= 40400
+__attribute__((optimize("O0")))
+# endif
+#endif
+void
+libar2_erase(volatile void *mem_, size_t size)
+{
+	void *mem = *(void **)(void *)&mem_;
+#if defined(memset_s)
+	memset_s(mem, size);
+#elif defined(explicit_bzero) || defined(__OpenBSD__)
+	explicit_bzero(mem, size);
+#elif defined(explicit_memset)
+	explicit_memset(mem, 0, size);
+#else
+	libar2_internal_explicit_memset__(mem, 0, size);
+#endif
+}
+
+/* Typo in version 1.0 */
+#if defined(__GNUC__)
+extern __typeof(libar2_erase) libar2_earse __attribute__((__weak__, __alias__("libar2_erase")));
+#else
+void libar2_earse(volatile void *mem, size_t size);
+void
+libar2_earse(volatile void *mem, size_t size)
+{
+	libar2_erase(mem, size);
+}
+#endif