1 files changed, 62 insertions, 0 deletions
diff --git a/tests/test-uint128.c b/tests/test-uint128.c
new file mode 100644
index 0000000..6301a38
--- /dev/null
+++ b/tests/test-uint128.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../util/types.h"
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+
+/* create a uint128_t from four uint32_ts. w0 is the most significant value,
+ * w2 the least */
+#define U128(w0, w1, w2, w3) { .words = { w0, w1, w2, w3 } }
+
+static int test_rc;
+
+static void check_str(nvme_uint128_t val, const char *exp, const char *res)
+{
+	if (!strcmp(res, exp))
+		return;
+
+	printf("ERROR: printing {%08x.%08x.%08x.%08x}, got '%s', expected '%s'\n",
+	       val.words[3], val.words[2], val.words[1], val.words[0],
+	       res, exp);
+
+	test_rc = 1;
+}
+
+struct tostr_test {
+	nvme_uint128_t val;
+	const char *exp;
+};
+
+static struct tostr_test tostr_tests[] = {
+	{ U128(0, 0, 0, 0), "0" },
+	{ U128(0, 0, 0, 1), "1" },
+	{ U128(0, 0, 0, 10), "10" },
+	{ U128(4, 3, 2, 1), "316912650112397582603894390785" },
+	{
+		U128(0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff),
+		"340282366920938463463374607431768211455"
+	},
+};
+
+void tostr_test(struct tostr_test *test)
+{
+	char *str;
+	str = uint128_t_to_string(test->val);
+	check_str(test->val, test->exp, str);
+}
+
+int main(void)
+{
+	unsigned int i;
+
+	test_rc = 0;
+
+	for (i = 0; i < ARRAY_SIZE(tostr_tests); i++)
+		tostr_test(&tostr_tests[i]);
+
+	return test_rc ? EXIT_FAILURE : EXIT_SUCCESS;
+}