WSJT-X/lib/igray.c

19 lines
244 B
C
Raw Normal View History

int igray_(int *n0, int *idir)
{
int n;
unsigned long sh;
unsigned long nn;
n=*n0;
if(*idir>0) return (n ^ (n >> 1));
sh = 1;
nn = (n >> sh);
while (nn > 0) {
n ^= nn;
sh <<= 1;
nn = (n >> sh);
}
return (n);
}