WSJT-X/libm65/igray.c

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#ifdef CVF
extern int __stdcall IGRAY(int *n0, int *idir)
#else
int igray_(int *n0, int *idir)
#endif
{
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);
}