[PATCH 01/11] lib: introduce common method to convert hex digits
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From: Andy Shevchenko on 22 Feb 2010 13:20 From: Andy Shevchenko <ext-andriy.shevchenko(a)nokia.com> hex_to_bin() is a little method which converts hex digit to its actual value. There are plenty of places where such functionality is needed. Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko(a)nokia.com> Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Ingo Molnar <mingo(a)elte.hu> --- include/linux/kernel.h | 2 ++ lib/hexdump.c | 19 +++++++++++++++++++ 2 files changed, 21 insertions(+), 0 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index 328bca6..bbbf885 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -361,6 +361,8 @@ static inline char *pack_hex_byte(char *buf, u8 byte) return buf; } +extern int hex_to_bin(char ch); + #ifndef pr_fmt #define pr_fmt(fmt) fmt #endif diff --git a/lib/hexdump.c b/lib/hexdump.c index 39af256..d79b166 100644 --- a/lib/hexdump.c +++ b/lib/hexdump.c @@ -16,6 +16,25 @@ const char hex_asc[] = "0123456789abcdef"; EXPORT_SYMBOL(hex_asc); /** + * hex_to_bin - convert a hex digit to its real value + * @ch: ascii character represents hex digit + * + * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad + * input. + */ +int hex_to_bin(char ch) +{ + if ((ch >= 'a') && (ch <= 'f')) + return ch - 'a' + 10; + if ((ch >= '0') && (ch <= '9')) + return ch - '0'; + if ((ch >= 'A') && (ch <= 'F')) + return ch - 'A' + 10; + return -1; +} +EXPORT_SYMBOL(hex_to_bin); + +/** * hex_dump_to_buffer - convert a blob of data to "hex ASCII" in memory * @buf: data blob to dump * @len: number of bytes in the @buf -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |