1 files changed, 34 insertions, 0 deletions
diff --git a/contrib/ntp/include/safecast.h b/contrib/ntp/include/safecast.h
new file mode 100644
index 0000000..9300463
--- /dev/null
+++ b/contrib/ntp/include/safecast.h
@@ -0,0 +1,34 @@
+#ifndef SAFECAST_H
+#define SAFECAST_H
+
+#include <limits.h>
+static inline int size2int_chk(size_t v)
+{
+	if (v > INT_MAX)
+		abort();
+	return (int)(v);
+}
+
+static inline int size2int_sat(size_t v)
+{
+	return (v > INT_MAX) ? INT_MAX : (int)v;
+}
+
+/* Compilers can emit warning about increased alignment requirements
+ * when casting pointers. The impact is tricky: on machines where
+ * alignment is just a performance issue (x86,x64,...) this might just
+ * cause a performance penalty. On others, an address error can occur
+ * and the process dies...
+ *
+ * Still, there are many cases where the pointer arithmetic and the
+ * buffer alignment make sure this does not happen. OTOH, the compiler
+ * doesn't know this and still emits warnings.
+ *
+ * The following cast macros are going through void pointers to tell
+ * the compiler that there is no alignment requirement to watch.
+ */
+#define UA_PTR(ptype,pval) ((ptype *)(void*)(pval))
+#define UAC_PTR(ptype,pval) ((const ptype *)(const void*)(pval))
+#define UAV_PTR(ptype,pval) ((volatile ptype *)(volatile void*)(pval))
+
+#endif