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/* wf_atan2.c -- float version of w_atan2.c.

 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.

 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 *

 */

/*

 * wrapper atan2f(y,x)

 */

#include "fdlibm.h"

#include <errno.h>

#ifdef __STDC__

        float atan2f(float y, float x)          /* wrapper atan2f */

#else

        float atan2f(y,x)                       /* wrapper atan2 */

        float y,x;

#endif

{

#ifdef _IEEE_LIBM

        return __ieee754_atan2f(y,x);

#else

        float z;

        struct exception exc;

        z = __ieee754_atan2f(y,x);

        if(_LIB_VERSION == _IEEE_||isnanf(x)||isnanf(y)) return z;

        if(x==(float)0.0&&y==(float)0.0) {

            /* atan2f(+-0,+-0) */

            exc.arg1 = y;

            exc.arg2 = x;

            exc.err = 0;

            exc.type = DOMAIN;

            exc.name = "atan2f";

            exc.retval = 0.0;

            if(_LIB_VERSION == _POSIX_)

               errno = EDOM;

            else if (!matherr(&exc)) {

               errno = EDOM;

            }

            if (exc.err != 0)

               errno = exc.err;

            return (float)exc.retval;

        } else

            return z;

#endif

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double atan2(double y, double x)

#else

        double atan2(y,x)

        double y,x;

#endif

{

        return (double) atan2f((float) y, (float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */