Add signed integers (arithmetics and some testing not implemented yet)

Signed-off-by: Mattias Andrée <m@maandree.se>

1 files changed, 54 insertions, 0 deletions

diff --git a/libj2_ji_to_j2i.c b/libj2_ji_to_j2i.c
new file mode 100644
index 0000000..25618ca
--- /dev/null
+++ b/libj2_ji_to_j2i.c
@@ -0,0 +1,54 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+extern inline void libj2_ji_to_j2i(intmax_t a, struct libj2_j2i *res);
+/* TODO Add man page */
+
+
+#else
+
+int
+main(void)
+{
+	struct libj2_j2i value;
+
+	value = (struct libj2_j2i){1, 2};
+	libj2_ji_to_j2i(0, &value);
+	EXPECT(value.high == 0);
+	EXPECT(value.low == 0);
+
+	value = (struct libj2_j2i){1, 2};
+	libj2_ji_to_j2i(5, &value);
+	EXPECT(value.high == 0);
+	EXPECT(value.low == 5);
+
+	value = (struct libj2_j2i){1, 2};
+	libj2_ji_to_j2i(10, &value);
+	EXPECT(value.high == 0);
+	EXPECT(value.low == 10);
+
+	value = (struct libj2_j2i){1, 2};
+	libj2_ji_to_j2i(INTMAX_MAX, &value);
+	EXPECT(value.high == 0);
+	EXPECT(value.low == (uintmax_t)INTMAX_MAX);
+
+	value = (struct libj2_j2i){1, 2};
+	libj2_ji_to_j2i(-1, &value);
+	EXPECT(value.high == UINTMAX_MAX);
+	EXPECT(value.low == UINTMAX_MAX);
+
+	value = (struct libj2_j2i){1, 2};
+	libj2_ji_to_j2i(-2, &value);
+	EXPECT(value.high == UINTMAX_MAX);
+	EXPECT(value.low == UINTMAX_MAX - 1U);
+
+	value = (struct libj2_j2i){1, 2};
+	libj2_ji_to_j2i(INTMAX_MIN, &value);
+	EXPECT(value.high == UINTMAX_MAX);
+	EXPECT(value.low == ~(uintmax_t)INTMAX_MAX);
+
+	return 0;
+}
+
+#endif