72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
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/* wf_atan2.c -- float version of w_atan2.c.
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*
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*/
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/*
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* wrapper atan2f(y,x)
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*/
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#include "fdlibm.h"
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#include <errno.h>
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#ifdef __STDC__
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float atan2f(float y, float x) /* wrapper atan2f */
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#else
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float atan2f(y,x) /* wrapper atan2 */
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float y,x;
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_atan2f(y,x);
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#else
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float z;
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struct exception exc;
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z = __ieee754_atan2f(y,x);
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if(_LIB_VERSION == _IEEE_||isnanf(x)||isnanf(y)) return z;
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if(x==(float)0.0&&y==(float)0.0) {
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/* atan2f(+-0,+-0) */
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exc.arg1 = y;
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exc.arg2 = x;
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exc.err = 0;
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exc.type = DOMAIN;
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exc.name = "atan2f";
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exc.retval = 0.0;
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if(_LIB_VERSION == _POSIX_)
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errno = EDOM;
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else if (!matherr(&exc)) {
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errno = EDOM;
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}
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if (exc.err != 0)
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errno = exc.err;
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return (float)exc.retval;
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} else
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return z;
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#endif
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}
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#ifdef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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double atan2(double y, double x)
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#else
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double atan2(y,x)
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double y,x;
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#endif
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{
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return (double) atan2f((float) y, (float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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