| Arnaldo Carvalho de Melo | ea5cc87 | 2009-06-01 22:31:03 -0300 | [diff] [blame] | 1 | #include "string.h" |
| 2 | |
| 3 | static int hex(char ch) |
| 4 | { |
| 5 | if ((ch >= '0') && (ch <= '9')) |
| 6 | return ch - '0'; |
| 7 | if ((ch >= 'a') && (ch <= 'f')) |
| 8 | return ch - 'a' + 10; |
| 9 | if ((ch >= 'A') && (ch <= 'F')) |
| 10 | return ch - 'A' + 10; |
| 11 | return -1; |
| 12 | } |
| 13 | |
| 14 | /* |
| 15 | * While we find nice hex chars, build a long_val. |
| 16 | * Return number of chars processed. |
| 17 | */ |
| 18 | int hex2u64(const char *ptr, __u64 *long_val) |
| 19 | { |
| 20 | const char *p = ptr; |
| 21 | *long_val = 0; |
| 22 | |
| 23 | while (*p) { |
| 24 | const int hex_val = hex(*p); |
| 25 | |
| 26 | if (hex_val < 0) |
| 27 | break; |
| 28 | |
| 29 | *long_val = (*long_val << 4) | hex_val; |
| 30 | p++; |
| 31 | } |
| 32 | |
| 33 | return p - ptr; |
| 34 | } |