util.c

   1 #include "util.h"
   2
   3 int bitpop(uint8_t bits)
   4 {
   5     int c;
   6     for (c = 0; bits; c++)
   7         bits &= bits -1;
   8     return c;
   9 }
  10
  11 int biton(uint8_t bits)
  12 {
  13     int n = 0;
  14     if (bits >> 4) { bits >>= 4; n += 4;}
  15     if (bits >> 2) { bits >>= 2; n += 2;}
  16     if (bits >> 1) { bits >>= 1; n += 1;}
  17     return n;
  18 }