1 files changed, 101 insertions, 0 deletions
diff --git a/regressions/ck_ec/validate/prop_test_timeutil_add.c b/regressions/ck_ec/validate/prop_test_timeutil_add.c
new file mode 100644
index 0000000..bd44607
--- /dev/null
+++ b/regressions/ck_ec/validate/prop_test_timeutil_add.c
@@ -0,0 +1,101 @@
+#include <assert.h>
+#include <ck_limits.h>
+#include <ck_stdint.h>
+
+#include "../../../src/ck_ec_timeutil.h"
+#include "fuzz_harness.h"
+
+#if ULONG_MAX > 4294967295
+typedef unsigned __int128 dword_t;
+#else
+typedef uint64_t dword_t;
+#endif
+
+struct example {
+	struct timespec ts;
+	struct timespec inc;
+};
+
+static const struct example examples[] = {
+	{
+		{
+			42,
+			100
+		},
+		{
+			1,
+			2
+		}
+	},
+	{
+		{
+			42,
+			100
+		},
+		{
+			1,
+			NSEC_MAX
+		}
+	},
+	{
+		{
+			42,
+			NSEC_MAX
+		},
+		{
+			0,
+			NSEC_MAX
+		}
+	},
+	{
+		{
+			TIME_MAX - 1,
+			1000
+		},
+		{
+			2,
+			NSEC_MAX
+		}
+	}
+};
+
+static struct timespec normalize_ts(const struct timespec ts)
+{
+	struct timespec ret = ts;
+
+	if (ret.tv_sec < 0) {
+		ret.tv_sec = ~ret.tv_sec;
+	}
+
+	if (ret.tv_nsec < 0) {
+		ret.tv_nsec = ~ret.tv_nsec;
+	}
+
+	ret.tv_nsec %= NSEC_MAX + 1;
+	return ret;
+}
+
+static dword_t ts_to_nanos(const struct timespec ts)
+{
+	return (dword_t)ts.tv_sec * (NSEC_MAX + 1) + ts.tv_nsec;
+}
+
+static inline int test_timespec_add(const struct example *example)
+{
+	const struct timespec ts = normalize_ts(example->ts);
+	const struct timespec inc = normalize_ts(example->inc);
+	const struct timespec actual = timespec_add(ts, inc);
+	const dword_t nanos = ts_to_nanos(ts) + ts_to_nanos(inc);
+
+	if (nanos / (NSEC_MAX + 1) > TIME_MAX) {
+		assert(actual.tv_sec == TIME_MAX);
+		assert(actual.tv_nsec == NSEC_MAX);
+	} else {
+		assert(actual.tv_sec == (time_t)(nanos / (NSEC_MAX + 1)));
+		assert(actual.tv_nsec == (long)(nanos % (NSEC_MAX + 1)));
+	}
+
+	return 0;
+}
+
+TEST(test_timespec_add, examples)