tools/perf/util/string.c

   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 }