Provide the BSD `struct timespec` arithmetic macro, timespecsub().

1 files changed, 45 insertions, 0 deletions

diff --git a/src/H5time_private.h b/src/H5time_private.h
new file mode 100644
index 0000000..bc9f274
--- /dev/null
+++ b/src/H5time_private.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2019 The HDF Group.  All rights reserved.
+ *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including
+ * terms governing use, modification, and redistribution, is contained in
+ * the COPYING file, which can be found at the root of the source code
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+ * If you do not have access to either file, you may request a copy from
+ * help@hdfgroup.org.
+ */
+
+#ifndef _H5time_private_H
+#define _H5time_private_H
+
+#ifdef __NetBSD__
+#include <sys/time.h>
+#else
+#define	timespecclear(tsp)	(tsp)->tv_sec = (time_t)((tsp)->tv_nsec = 0L)
+#define	timespecisset(tsp)	((tsp)->tv_sec || (tsp)->tv_nsec)
+#define	timespeccmp(tsp, usp, cmp)					\
+	(((tsp)->tv_sec == (usp)->tv_sec) ?				\
+	    ((tsp)->tv_nsec cmp (usp)->tv_nsec) :			\
+	    ((tsp)->tv_sec cmp (usp)->tv_sec))
+#define	timespecadd(tsp, usp, vsp)					\
+	do {								\
+		(vsp)->tv_sec = (tsp)->tv_sec + (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec + (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec >= 1000000000L) {			\
+			(vsp)->tv_sec++;				\
+			(vsp)->tv_nsec -= 1000000000L;			\
+		}							\
+	} while (/* CONSTCOND */ 0)
+#define	timespecsub(tsp, usp, vsp)					\
+	do {								\
+		(vsp)->tv_sec = (tsp)->tv_sec - (usp)->tv_sec;		\
+		(vsp)->tv_nsec = (tsp)->tv_nsec - (usp)->tv_nsec;	\
+		if ((vsp)->tv_nsec < 0) {				\
+			(vsp)->tv_sec--;				\
+			(vsp)->tv_nsec += 1000000000L;			\
+		}							\
+	} while (/* CONSTCOND */ 0)
+#define timespec2ns(x) (((uint64_t)(x)->tv_sec) * 1000000000L + (x)->tv_nsec)
+#endif
+
+#endif /* _H5time_private_H */