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84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/* wf_atanh.c -- float version of w_atanh.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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* wrapper atanhf(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 atanhf(float x) /* wrapper atanhf */
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#else
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float atanhf(x) /* wrapper atanhf */
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float x;
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_atanhf(x);
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#else
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float z,y;
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struct exception exc;
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z = __ieee754_atanhf(x);
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if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
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y = fabsf(x);
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if(y>=(float)1.0) {
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if(y>(float)1.0) {
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/* atanhf(|x|>1) */
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exc.type = DOMAIN;
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exc.name = "atanhf";
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exc.err = 0;
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exc.arg1 = exc.arg2 = (double)x;
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exc.retval = 0.0/0.0;
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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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} else {
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/* atanhf(|x|=1) */
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exc.type = SING;
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exc.name = "atanhf";
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exc.err = 0;
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exc.arg1 = exc.arg2 = (double)x;
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exc.retval = x/0.0; /* sign(x)*inf */
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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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}
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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 atanh(double x)
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#else
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double atanh(x)
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double x;
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#endif
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{
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return (double) atanhf((float) x);
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}
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#endif /* defined(_DOUBLE_IS_32BITS) */
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