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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [w_acos.c] - Blame information for rev 855

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1 148 jeremybenn
 
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/* @(#)w_acos.c 5.1 93/09/24 */
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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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FUNCTION
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        <<acos>>, <<acosf>>---arc cosine
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INDEX
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        acos
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INDEX
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        acosf
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ANSI_SYNOPSIS
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        #include <math.h>
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        double acos(double <[x]>);
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        float acosf(float <[x]>);
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TRAD_SYNOPSIS
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        #include <math.h>
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        double acos(<[x]>)
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        double <[x]>;
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        float acosf(<[x]>)
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        float <[x]>;
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DESCRIPTION
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        <<acos>> computes the inverse cosine (arc cosine) of the input value.
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        Arguments to <<acos>> must be in the range @minus{}1 to 1.
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        <<acosf>> is identical to <<acos>>, except that it performs
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        its calculations on <<floats>>.
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RETURNS
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        @ifnottex
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        <<acos>> and <<acosf>> return values in radians, in the range of 0 to pi.
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        @end ifnottex
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        @tex
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        <<acos>> and <<acosf>> return values in radians, in the range of <<0>> to $\pi$.
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        @end tex
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        If <[x]> is not between @minus{}1 and 1, the returned value is NaN
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        (not a number) the global variable <<errno>> is set to <<EDOM>>, and a
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        <<DOMAIN error>> message is sent as standard error output.
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        You can modify error handling for these functions using <<matherr>>.
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QUICKREF ANSI SVID POSIX RENTRANT
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 acos    y,y,y,m
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 acosf   n,n,n,m
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MATHREF
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 acos, [-1,1], acos(arg),,,
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 acos, NAN,    arg,DOMAIN,EDOM
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MATHREF
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 acosf, [-1,1], acosf(arg),,,
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 acosf, NAN,    argf,DOMAIN,EDOM
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*/
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/*
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 * wrap_acos(x)
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 */
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#include "fdlibm.h"
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#include <errno.h>
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#ifndef _DOUBLE_IS_32BITS
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#ifdef __STDC__
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        double acos(double x)           /* wrapper acos */
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#else
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        double acos(x)                  /* wrapper acos */
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        double x;
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#endif
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{
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#ifdef _IEEE_LIBM
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        return __ieee754_acos(x);
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#else
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        double z;
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        struct exception exc;
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        z = __ieee754_acos(x);
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        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
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        if(fabs(x)>1.0) {
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            /* acos(|x|>1) */
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            exc.type = DOMAIN;
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            exc.name = "acos";
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            exc.err = 0;
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            exc.arg1 = exc.arg2 = x;
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            exc.retval = nan("");
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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 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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#endif /* defined(_DOUBLE_IS_32BITS) */

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