linux-kernel - [PATCH 18/32] tools/nolibc: add tolower() and toupper()

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Message-Id: <20250304-nolibc-kselftest-harness-v1-18-adca7cd231e2@linutronix.de>
Date: Tue, 04 Mar 2025 08:10:48 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Shuah Khan <shuah@...nel.org>, Shuah Khan <skhan@...uxfoundation.org>, 
 Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 18/32] tools/nolibc: add tolower() and toupper()

The kselftest harness uses these functions.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 tools/include/nolibc/string.h                | 17 +++++++++++++++++
 tools/testing/selftests/nolibc/nolibc-test.c |  5 +++++
 2 files changed, 22 insertions(+)

diff --git a/tools/include/nolibc/string.h b/tools/include/nolibc/string.h
index ba84ab700e3001a7d105e1c9e40c01bf45db9d8c..f0d335f0e467ec870066811289dfd11e46e60a92 100644
--- a/tools/include/nolibc/string.h
+++ b/tools/include/nolibc/string.h
@@ -289,6 +289,23 @@ char *strrchr(const char *s, int c)
 	return (char *)ret;
 }
 
+static __attribute__((unused))
+int tolower(int c)
+{
+	if (c >= 'A' && c <= 'Z')
+		return c - 'A' + 'a';
+	return c;
+}
+
+static __attribute__((unused))
+int toupper(int c)
+{
+	if (c >= 'a' && c <= 'z')
+		return c - 'a' + 'A';
+	return c;
+}
+
+
 /* make sure to include all global symbols */
 #include "nolibc.h"
 
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c
index 3c0431e9917acf57e94dc3f7a8347762e6a5335a..7eb7f3fb067553cccefefdaa2ccfc81af281336b 100644
--- a/tools/testing/selftests/nolibc/nolibc-test.c
+++ b/tools/testing/selftests/nolibc/nolibc-test.c
@@ -40,6 +40,7 @@
 #include <stdint.h>
 #include <unistd.h>
 #include <limits.h>
+#include <ctype.h>
 #endif
 #endif
 
@@ -1264,6 +1265,10 @@ int run_stdlib(int min, int max)
 		CASE_TEST(strerror_EINVAL);         EXPECT_STREQ(is_nolibc, strerror(EINVAL), "errno=22"); break;
 		CASE_TEST(strerror_int_max);        EXPECT_STREQ(is_nolibc, strerror(INT_MAX), "errno=2147483647"); break;
 		CASE_TEST(strerror_int_min);        EXPECT_STREQ(is_nolibc, strerror(INT_MIN), "errno=-2147483648"); break;
+		CASE_TEST(tolower);                 EXPECT_EQ(1, tolower('A'), 'a'); break;
+		CASE_TEST(tolower_noop);            EXPECT_EQ(1, tolower('a'), 'a'); break;
+		CASE_TEST(toupper);                 EXPECT_EQ(1, toupper('a'), 'A'); break;
+		CASE_TEST(toupper_noop);            EXPECT_EQ(1, toupper('A'), 'A'); break;
 
 		case __LINE__:
 			return ret; /* must be last */

-- 
2.48.1