linux-kernel - [PATCH v3 2/3] lib/string_helpers: Change returned value of the strreplace()

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Message-Id: <20230605170553.7835-3-andriy.shevchenko@linux.intel.com>
Date:   Mon,  5 Jun 2023 20:05:52 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     "Theodore Ts'o" <tytso@....edu>, Jan Kara <jack@...e.com>,
        Andy Shevchenko <andy@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH v3 2/3] lib/string_helpers: Change returned value of the strreplace()

It's more useful to return the pointer to the string itself
with strreplace(), so it may be used like

	attr->name = strreplace(name, '/', '_');

While at it, amend the kernel documentation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/string.h |  2 +-
 lib/string_helpers.c   | 12 ++++++++----
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/include/linux/string.h b/include/linux/string.h
index c062c581a98b..dbfc66400050 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -169,7 +169,7 @@ static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
 #endif
 
 void *memchr_inv(const void *s, int c, size_t n);
-char *strreplace(char *s, char old, char new);
+char *strreplace(char *str, char old, char new);
 
 extern void kfree_const(const void *x);
 
diff --git a/lib/string_helpers.c b/lib/string_helpers.c
index 230020a2e076..d3b1dd718daf 100644
--- a/lib/string_helpers.c
+++ b/lib/string_helpers.c
@@ -979,18 +979,22 @@ EXPORT_SYMBOL(__sysfs_match_string);
 
 /**
  * strreplace - Replace all occurrences of character in string.
- * @s: The string to operate on.
+ * @str: The string to operate on.
  * @old: The character being replaced.
  * @new: The character @old is replaced with.
  *
- * Returns pointer to the nul byte at the end of @s.
+ * Replaces the each @old character with a @new one in the given string @str.
+ *
+ * Return: pointer to the string @str itself.
  */
-char *strreplace(char *s, char old, char new)
+char *strreplace(char *str, char old, char new)
 {
+	char *s = str;
+
 	for (; *s; ++s)
 		if (*s == old)
 			*s = new;
-	return s;
+	return str;
 }
 EXPORT_SYMBOL(strreplace);
 
-- 
2.40.0.1.gaa8946217a0b