Commit 90378889 authored May 24, 2010 by Andy Shevchenko Committed by Linus Torvalds May 25, 2010

lib: introduce common method to convert hex digits

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.

[akpm@linux-foundation.org: use tolower(), saving 3 bytes, test the more common case first - it's quicker]
[akpm@linux-foundation.org: relocate tolower to make it even faster! (Joe)]
Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Cc: Tilman Schmidt <tilman@imap.cc>
Cc: Duncan Sands <duncan.sands@free.fr>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: "Richard Russon (FlatCap)" <ldm@flatcap.org>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent db0fd97c

include/linux/kernel.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -375,6 +375,8 @@ 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

lib/hexdump.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -15,6 +15,24 @@
		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 >= '0') && (ch <= '9'))
		return ch - '0';
		ch = tolower(ch);
		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

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