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Fri, 30 Jan 2026 00:37:51 -0800 (PST) From: "licheng.li" To: Willy Tarreau , David Laight Cc: =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , linux-kernel@vger.kernel.org, im.lechain@gmail.com Subject: [PATCH 2/2] selftests/nolibc: add tests for printf zero padding (0) Date: Fri, 30 Jan 2026 16:37:36 +0800 Message-ID: <20260130083737.1123-2-im.lechain@gmail.com> X-Mailer: git-send-email 2.51.0.windows.1 In-Reply-To: <20260130083737.1123-1-im.lechain@gmail.com> References: <20260130083737.1123-1-im.lechain@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Cheng Li This patch adds validation for the '0' flag in printf() to ensure correct behavior for pointers, positive integers, and negative integers. The tests specifically verify that: - Pointers include the '0x' prefix before padding. - Negative numbers include the '-' sign before padding. - Width and padding are correctly calculated. Signed-off-by: Cheng Li --- tools/testing/selftests/nolibc/nolibc-test.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index c11fcf6c5075..77bb8796aa3d 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -1723,6 +1723,9 @@ static int run_printf(int min, int max) CASE_TEST(truncation); EXPECT_VFPRINTF(25, "01234567890123456789", "%s", "0123456789012345678901234"); break; CASE_TEST(string_width); EXPECT_VFPRINTF(10, " 1", "%10s", "1"); break; CASE_TEST(number_width); EXPECT_VFPRINTF(10, " 1", "%10d", 1); break; + CASE_TEST(zero_pad_ptr); EXPECT_VFPRINTF(5, "0x005", "%05p", (void *)5); break; + CASE_TEST(zero_pad_int); EXPECT_VFPRINTF(5, "00005", "%05d", 5); break; + CASE_TEST(zero_pad_neg); EXPECT_VFPRINTF(5, "-0005", "%05d", -5); break; CASE_TEST(number_left); EXPECT_VFPRINTF(10, "|-5 |", "|%-8d|", -5); break; CASE_TEST(string_align); EXPECT_VFPRINTF(10, "|foo |", "|%-8s|", "foo"); break; CASE_TEST(width_trunc); EXPECT_VFPRINTF(25, " ", "%25d", 1); break; -- 2.52.0