diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/hexdump.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/hexdump.c b/lib/hexdump.c index 1bd6a9779774..5d7a4802c562 100644 --- a/lib/hexdump.c +++ b/lib/hexdump.c @@ -16,6 +16,24 @@ 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 * @len: number of bytes in the @buf |