From: Raffaele Tranfaglia via B4 Relay <devnull+raffaele.tranfaglia.gmail.com@kernel.org>
To: "Rodrigo Alencar" <rodrigo.alencar@analog.com>,
"Jonathan Cameron" <jic23@kernel.org>,
"David Lechner" <dlechner@baylibre.com>,
"Nuno Sá" <nuno.sa@analog.com>,
"Andy Shevchenko" <andy@kernel.org>
Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
Raffaele Tranfaglia <raffaele.tranfaglia@gmail.com>
Subject: [PATCH v2 2/2] iio: test: iio-test-format: add test case for char format
Date: Mon, 02 Nov 2026 08:33:56 +0000 [thread overview]
Message-ID: <20261102-iio-test-format-char-v2-2-926100689e62@gmail.com> (raw)
In-Reply-To: <20261102-iio-test-format-char-v2-0-926100689e62@gmail.com>
From: Raffaele Tranfaglia <raffaele.tranfaglia@gmail.com>
IIO_VAL_CHAR is used by thermocouple drivers to report the
thermocouple type, but iio_format_value() has no test for it.
Add a test case covering printable, special and non-printable
characters, a NUL character, and values that do not fit in a char.
Signed-off-by: Raffaele Tranfaglia <raffaele.tranfaglia@gmail.com>
---
drivers/iio/test/iio-test-format.c | 67 ++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/drivers/iio/test/iio-test-format.c b/drivers/iio/test/iio-test-format.c
index 35b30420d995..0faafa09f32b 100644
--- a/drivers/iio/test/iio-test-format.c
+++ b/drivers/iio/test/iio-test-format.c
@@ -215,6 +215,72 @@ static void iio_test_iio_format_value_multiple(struct kunit *test)
IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "1 -2 3 -4 5 \n");
}
+static void iio_test_iio_format_value_char(struct kunit *test)
+{
+ char *buf;
+ int val;
+ int ret;
+
+ buf = iio_test_format_alloc_buf(test);
+
+ /* Printable characters, e.g. a thermocouple type */
+ val = 'K';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "K\n");
+
+ val = 'j';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "j\n");
+
+ val = '0';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "0\n");
+
+ /* Special characters are printed as is */
+ val = ' ';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\x20\n");
+
+ val = '%';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "%\n");
+
+ val = '\\';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\\\n");
+
+ /* Non-printable characters are printed as is */
+ val = '\n';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\n\n");
+
+ val = '\t';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\t\n");
+
+ val = 0x7f;
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\x7f\n");
+
+ val = 0xff;
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\xff\n");
+
+ /* A NUL character is emitted and counted like any other */
+ val = '\0';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\0\n");
+
+ /* Only the low byte of the value is used */
+ val = 0x100 + 'K';
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "K\n");
+
+ val = -1;
+ ret = iio_format_value(buf, IIO_VAL_CHAR, 1, &val);
+ IIO_TEST_FORMAT_EXPECT_EQ(test, buf, ret, "\xff\n");
+}
+
static void iio_test_iio_format_value_integer_64(struct kunit *test)
{
int values[2];
@@ -324,6 +390,7 @@ static struct kunit_case iio_format_test_cases[] = {
KUNIT_CASE(iio_test_iio_format_value_fractional),
KUNIT_CASE(iio_test_iio_format_value_fractional_log2),
KUNIT_CASE(iio_test_iio_format_value_multiple),
+ KUNIT_CASE(iio_test_iio_format_value_char),
KUNIT_CASE(iio_test_iio_format_value_integer_64),
KUNIT_CASE(iio_test_iio_format_value_decimal_64),
{ }
--
2.56.0
prev parent reply other threads:[~2026-11-02 8:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-02 8:33 [PATCH v2 0/2] iio: test: iio-test-format: char format test and overrun checks Raffaele Tranfaglia via B4 Relay
2026-11-02 8:33 ` [PATCH v2 1/2] iio: test: iio-test-format: check that nothing is written past the string Raffaele Tranfaglia via B4 Relay
2026-11-02 8:33 ` Raffaele Tranfaglia via B4 Relay [this message]
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