linux-kernel - [PATCH v1] auxdisplay: charlcd: Reuse hex_to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200518193617.74548-1-andriy.shevchenko@linux.intel.com>
Date:   Mon, 18 May 2020 22:36:17 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1] auxdisplay: charlcd: Reuse hex_to_bin() instead of custom code

hex_to_bin() may be used to convert hexdecimal digit to its binary
representation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/auxdisplay/charlcd.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index d58278ae9e4a..5aee0f546351 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -485,24 +485,19 @@ static inline int handle_lcd_special_code(struct charlcd *lcd)
 		shift = 0;
 		value = 0;
 		while (*esc && cgoffset < 8) {
+			int half;
+
 			shift ^= 4;
-			if (*esc >= '0' && *esc <= '9') {
-				value |= (*esc - '0') << shift;
-			} else if (*esc >= 'A' && *esc <= 'F') {
-				value |= (*esc - 'A' + 10) << shift;
-			} else if (*esc >= 'a' && *esc <= 'f') {
-				value |= (*esc - 'a' + 10) << shift;
-			} else {
-				esc++;
+
+			half = hex_to_bin(*esc++);
+			if (half < 0)
 				continue;
-			}
 
+			value |= half << shift;
 			if (shift == 0) {
 				cgbytes[cgoffset++] = value;
 				value = 0;
 			}
-
-			esc++;
 		}
 
 		lcd->ops->write_cmd(lcd, LCD_CMD_SET_CGRAM_ADDR | (cgaddr * 8));
-- 
2.26.2