linux-kernel - [PATCH 12/12] selftests/nolibc: Use printf("%.*s", n, "") to align output

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Message-Id: <20260203103000.20206-13-david.laight.linux@gmail.com>
Date: Tue,  3 Feb 2026 10:30:00 +0000
From: david.laight.linux@...il.com
To: Willy Tarreau <w@....eu>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	linux-kernel@...r.kernel.org,
	Cheng Li <lechain@...il.com>
Cc: David Laight <david.laight.linux@...il.com>
Subject: [PATCH 12/12] selftests/nolibc: Use printf("%.*s", n, "") to align output

From: David Laight <david.laight.linux@...il.com>

Now that printf supports '*' for field widths it can be used to
align the "[OK]" strings in the output.

Signed-off-by: David Laight <david.laight.linux@...il.com>
---
 tools/testing/selftests/nolibc/nolibc-test.c | 21 ++++----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index bf92b9046175..1b0cfd77145a 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -141,21 +141,6 @@ static const char *errorname(int err)
 	}
 }
 
-static void align_result(size_t llen)
-{
-	const size_t align = 64;
-	char buf[align];
-	size_t n;
-
-	if (llen >= align)
-		return;
-
-	n = align - llen;
-	memset(buf, ' ', n);
-	buf[n] = '\0';
-	fputs(buf, stdout);
-}
-
 enum RESULT {
 	OK,
 	FAIL,
@@ -173,8 +158,10 @@ static void result(int llen, enum RESULT r)
 	else
 		msg = " [FAIL]";
 
-	align_result(llen);
-	puts(msg);
+	llen = 64 - llen;
+	if (llen < 0)
+		llen = 0;
+	printf("%*s%s\n", llen, "", msg);
 }
 
 /* The tests below are intended to be used by the macroes, which evaluate
-- 
2.39.5