[PATCH 3/5] tests/futex: Add support for return codes other than 0 and -1 to sprintrc

[Eugene Syromyatnikov]

* tests/futex.c (sprintrc): Print the actual return code provided, not
  just "0".
---
 tests/futex.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tests/futex.c b/tests/futex.c
index edb5c9d..fb7833c 100644
--- a/tests/futex.c
+++ b/tests/futex.c
@@ -147,11 +147,22 @@ const char *sprintrc(int rc)
 {
 	enum { RES_BUF_SIZE = 4095 };
 	static char buf[RES_BUF_SIZE];
+	int saved_errno = errno;
+	int ret;
 
+	/* Common case, making it quick and error-free */
 	if (rc == 0)
 		return "0";
 
-	snprintf(buf, sizeof(buf), "-1 %s (%m)", errno2name());
+	ret = snprintf(buf, sizeof(buf), "%d", rc);
+
+	if (ret < 0)
+		perror_msg_and_fail("snprintf");
+	if ((rc != -1) || ((size_t)ret >= sizeof(buf)))
+		return buf;
+
+	errno = saved_errno;
+	snprintf(buf + ret, sizeof(buf) - ret, " %s (%m)", errno2name());
 
 	return buf;
 }
-- 
1.7.10.4