Add queue.h tree.h _null.h

Import queue.h tree.h _null.h header files from OpenBSD upstream
since x509_issuer_cache.c requires them.

1 files changed, 18 insertions, 0 deletions

diff --git a/include/compat/sys/_null.h b/include/compat/sys/_null.h
new file mode 100644
index 0000000..5d15401
--- /dev/null
+++ b/include/compat/sys/_null.h
@@ -0,0 +1,18 @@
+/*      $OpenBSD: _null.h,v 1.2 2016/09/09 22:07:58 millert Exp $       */
+
+/*
+ * Written by Todd C. Miller, September 9, 2016
+ * Public domain.
+ */
+
+#ifndef NULL
+#if !defined(__cplusplus)
+#define NULL    ((void *)0)
+#elif __cplusplus >= 201103L
+#define NULL    nullptr
+#elif defined(__GNUG__)
+#define NULL    __null
+#else
+#define NULL    0L
+#endif
+#endif