linux-kernel - [PATCH] lib/string: sysfs_streq works case insensitively

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Message-Id: <20210412113315.91700-1-gi-oh.kim@ionos.com>
Date:   Mon, 12 Apr 2021 13:33:15 +0200
From:   Gioh Kim <gi-oh.kim@...os.com>
To:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Cc:     ndesaulniers@...gle.com, gregkh@...uxfoundation.org,
        Gioh Kim <gi-oh.kim@...os.com>
Subject: [PATCH] lib/string: sysfs_streq works case insensitively

As the name shows, it checks the strings inputed from sysfs.
It should work for both case-sensitive filesystem and
case-insensitive filesystem. Therefore sysfs_streq should work
case-insensitively.

Signed-off-by: Gioh Kim <gi-oh.kim@...os.com>
---
 lib/string.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/string.c b/lib/string.c
index 7548eb715ddb..d0914dffdaae 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -688,7 +688,8 @@ EXPORT_SYMBOL(strsep);
 #endif
 
 /**
- * sysfs_streq - return true if strings are equal, modulo trailing newline
+ * sysfs_streq - return true if strings are equal case-insentively,
+ *               modulo trailing newline
  * @s1: one string
  * @s2: another string
  *
@@ -696,10 +697,11 @@ EXPORT_SYMBOL(strsep);
  * NUL and newline-then-NUL as equivalent string terminations.  It's
  * geared for use with sysfs input strings, which generally terminate
  * with newlines but are compared against values without newlines.
+ * And case does not matter for the sysfs input strings comparison.
  */
 bool sysfs_streq(const char *s1, const char *s2)
 {
-	while (*s1 && *s1 == *s2) {
+	while (*s1 && tolower(*s1) == tolower(*s2)) {
 		s1++;
 		s2++;
 	}
-- 
2.25.1