1 files changed, 49 insertions, 0 deletions
diff --git a/src/cmd/tests/shared/ringbuf.c b/src/cmd/tests/shared/ringbuf.c
new file mode 100644
index 0000000..d2a35a1
--- /dev/null
+++ b/src/cmd/tests/shared/ringbuf.c
@@ -0,0 +1,49 @@
+#include "../tests.h"
+#include <shared/ring.h>
+#include <string.h>
+
+static void test_ringbuf(void) {
+	char backbuf[16], cmpbuf[16];
+	size_t num_read = 0, num_written = 0;
+	uint8_t c;
+
+	ring_t r = {backbuf, 16, 0, 0};
+
+	/* aliasing */
+	for (size_t i = 0; i < 16; i++) {
+		test(ring_used(&r) == 0);
+		test(ring_avail(&r) == 16);
+		ring_put(&r, "11 bytes...", 11);
+		test(ring_used(&r) == 11);
+		test(ring_avail(&r) == 5);
+
+		memset(cmpbuf, 0, sizeof cmpbuf);
+		test(ring_get(&r, cmpbuf, 16) == 11);
+		test(memcmp(cmpbuf, "11 bytes...", 11) == 0);
+	}
+
+	test(ring_used(&r) == 0);
+	for (size_t i = 0; i < 7; i++)
+		ring_put1b(&r, num_written++);
+	test(ring_used(&r) == 7);
+	for (size_t i = 0; i < 3; i++) {
+		ring_get(&r, &c, 1);
+		test(num_read++ == c);
+	}
+	test(ring_used(&r) == 4);
+
+	for (size_t j = 0; j < 40; j++) {
+		for (size_t i = 0; i < 7; i++)
+			ring_put1b(&r, num_written++ & 0xff);
+		test(ring_used(&r) == 11);
+		for (size_t i = 0; i < 7; i++) {
+			ring_get(&r, &c, 1);
+			test((num_read++ & 0xff) == c);
+		}
+		test(ring_used(&r) == 4);
+	}
+}
+
+void r_s_ringbuf(void) {
+	run_test(test_ringbuf);
+}