Since converting 2 ascii hex digits into a byte with error checks
is commonly used, we can replace multiple hex_to_bin() calls with
a single call to unpack_hex_byte().
Changelog:
- Error checking added based on Tetsuo Handa's patch.
- Moved the hex2bin code here, making it into a static inline function.
(Andy Shevchenko's request.)
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx>
---
include/linux/kernel.h | 21 +++++++++++++++++++++
1 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 46ac9a5..d8ea13b 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -385,6 +385,27 @@ extern int hex_to_bin(char ch);
extern void hex2bin(u8 *dst, const char *src, size_t count);
/*
+ * unpack_hex_byte - convert 2 asii hex digits into a byte
+ * @byte: binary result
+ * @buf: ascii hexadecimal byte string
+ */
+static inline bool unpack_hex_byte(u8 *byte, const char *buf)
+{
+ int hi, lo;
+
+ hi = hex_to_bin(buf[0]);
+ if (hi < 0)
+ return false;
+
+ lo = hex_to_bin(buf[1]);
+ if (lo < 0)
+ return false;
+
+ *byte = (hi << 4) | lo;
+ return true;
+}
+
+/*
* General tracing related utility functions - trace_printk(),
* tracing_on/tracing_off and tracing_start()/tracing_stop
*
--
1.7.3.4
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