linux-kernel - [PATCH 08/12] printk: Replace strncmp with str_has

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Message-Id: <20190729151505.9660-1-hslester96@gmail.com>
Date:   Mon, 29 Jul 2019 23:15:05 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH 08/12] printk: Replace strncmp with str_has_prefix

strncmp(str, const, len) is error-prone.
We had better use newly introduced
str_has_prefix() instead of it.

Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
 kernel/printk/braille.c | 4 ++--
 kernel/printk/printk.c  | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/printk/braille.c b/kernel/printk/braille.c
index 1d21ebacfdb8..64f0fb8ef27d 100644
--- a/kernel/printk/braille.c
+++ b/kernel/printk/braille.c
@@ -11,10 +11,10 @@
 
 int _braille_console_setup(char **str, char **brl_options)
 {
-	if (!strncmp(*str, "brl,", 4)) {
+	if (str_has_prefix(*str, "brl,")) {
 		*brl_options = "";
 		*str += 4;
-	} else if (!strncmp(*str, "brl=", 4)) {
+	} else if (str_has_prefix(*str, "brl=")) {
 		*brl_options = *str + 4;
 		*str = strchr(*brl_options, ',');
 		if (!*str) {
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 1888f6a3b694..9e60dce4bdd5 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -121,13 +121,13 @@ static int __control_devkmsg(char *str)
 	if (!str)
 		return -EINVAL;
 
-	if (!strncmp(str, "on", 2)) {
+	if (str_has_prefix(str, "on")) {
 		devkmsg_log = DEVKMSG_LOG_MASK_ON;
 		return 2;
-	} else if (!strncmp(str, "off", 3)) {
+	} else if (str_has_prefix(str, "off")) {
 		devkmsg_log = DEVKMSG_LOG_MASK_OFF;
 		return 3;
-	} else if (!strncmp(str, "ratelimit", 9)) {
+	} else if (str_has_prefix(str, "ratelimit")) {
 		devkmsg_log = DEVKMSG_LOG_MASK_DEFAULT;
 		return 9;
 	}
-- 
2.20.1