[PATCH] tests: enhance printstr decode check

[JingPiao Chen]

* tests/printstr.c: Add a case for room < DEFAULT_STRLEN + 1.
---
 tests/printstr.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tests/printstr.c b/tests/printstr.c
index 330234f..035ce9c 100644
--- a/tests/printstr.c
+++ b/tests/printstr.c
@@ -40,7 +40,7 @@ int
 main(void)
 {
 	char *const buf = tail_alloc(DEFAULT_STRLEN + 1);
-	const struct iovec io = {
+	struct iovec io = {
 		.iov_base = buf,
 		.iov_len = -1
 	};
@@ -64,6 +64,11 @@ main(void)
 	tprintf("writev(-1, [{iov_base=\"\\0%*s\"..., iov_len=%lu}], 1)"
 		" = %s\n", DEFAULT_STRLEN - 1, buf + 1, -1UL, sprintrc(rc));
 
+	io.iov_base += 1;
+	rc = writev(-1, &io, 1);
+	tprintf("writev(-1, [{iov_base=%p, iov_len=%lu}], 1)"
+		" = %s\n", io.iov_base, -1UL, sprintrc(rc));
+
 	tprintf("+++ exited with 0 +++\n");
 	return 0;
 }
-- 
2.7.4