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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@37 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
23 lines
317 B
C
23 lines
317 B
C
#ifdef WIN32
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extern int __stdcall IGRAY(int *n0, int *idir)
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#else
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int igray_(int *n0, int *idir)
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#endif
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{
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int n;
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unsigned long sh;
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unsigned long nn;
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n=*n0;
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if(*idir>0) return (n ^ (n >> 1));
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sh = 1;
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nn = (n >> sh);
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while (nn > 0) {
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n ^= nn;
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sh <<= 1;
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nn = (n >> sh);
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}
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return (n);
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}
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