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lib: introduce common method to convert hex digits

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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.

[[email protected]: use tolower(), saving 3 bytes, test the more common case first - it's quicker]
[[email protected]: relocate tolower to make it even faster! (Joe)]
Signed-off-by: Andy Shevchenko <[email protected]>
Cc: Tilman Schmidt <[email protected]>
Cc: Duncan Sands <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: "Richard Russon (FlatCap)" <[email protected]>
Cc: John W. Linville <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andy Shevchenko 2010-05-24 14:33:23 -07:00 • committed by Linus Torvalds
commit 903788892e
2 changed files with 20 additions and 0 deletions
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18
lib/hexdump.c
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@ -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