1 files changed, 99 insertions, 0 deletions
diff --git a/regressions/ck_ec/validate/prop_test_timeutil_cmp.c b/regressions/ck_ec/validate/prop_test_timeutil_cmp.c
new file mode 100644
index 0000000..00e7b2e
--- /dev/null
+++ b/regressions/ck_ec/validate/prop_test_timeutil_cmp.c
@@ -0,0 +1,99 @@
+#include <assert.h>
+
+#include "../../../src/ck_ec_timeutil.h"
+#include "fuzz_harness.h"
+
+#if ULONG_MAX > 4294967295
+typedef __int128 dsword_t;
+#else
+typedef int64_t dsword_t;
+#endif
+
+struct example {
+	struct timespec x;
+	struct timespec y;
+};
+
+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_nsec < 0) {
+		ret.tv_nsec = ~ret.tv_nsec;
+	}
+
+	ret.tv_nsec %= NSEC_MAX + 1;
+	return ret;
+}
+
+static dsword_t ts_to_nanos(const struct timespec ts)
+{
+	return (dsword_t)ts.tv_sec * (NSEC_MAX + 1) + ts.tv_nsec;
+}
+
+static inline int test_timespec_cmp(const struct example *example)
+{
+	const struct timespec x = normalize_ts(example->y);
+	const struct timespec y = normalize_ts(example->x);
+	const dsword_t x_nanos = ts_to_nanos(x);
+	const dsword_t y_nanos = ts_to_nanos(y);
+
+	assert(timespec_cmp(x, x) == 0);
+	assert(timespec_cmp(y, y) == 0);
+	assert(timespec_cmp(x, y) == -timespec_cmp(y, x));
+
+	if (x_nanos == y_nanos) {
+		assert(timespec_cmp(x, y) == 0);
+	} else if (x_nanos < y_nanos) {
+		assert(timespec_cmp(x, y) == -1);
+	} else {
+		assert(timespec_cmp(x, y) == 1);
+	}
+
+	return 0;
+}
+
+TEST(test_timespec_cmp, examples)