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 } 35