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/* wf_log.c -- float version of w_log.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 logf(x)

 */

#include "fdlibm.h"

#include <errno.h>

#ifdef __STDC__

        float logf(float x)             /* wrapper logf */

#else

        float logf(x)                   /* wrapper logf */

        float x;

#endif

{

#ifdef _IEEE_LIBM

        return __ieee754_logf(x);

#else

        float z;

        struct exception exc;

        z = __ieee754_logf(x);

        if(_LIB_VERSION == _IEEE_ || isnan(x) || x > (float)0.0) return z;

#ifndef HUGE_VAL 

#define HUGE_VAL inf

        double inf = 0.0;

        SET_HIGH_WORD(inf,0x7ff00000);  /* set inf to infinite */

#endif

        exc.name = "logf";

        exc.err = 0;

        exc.arg1 = exc.arg2 = (double)x;

        if (_LIB_VERSION == _SVID_)

           exc.retval = -HUGE;

        else

           exc.retval = -HUGE_VAL;

        if(x==(float)0.0) {

            /* logf(0) */

            exc.type = SING;

            if (_LIB_VERSION == _POSIX_)

               errno = ERANGE;

            else if (!matherr(&exc)) {

               errno = ERANGE;

            }

        } else {

            /* logf(x<0) */

            exc.type = DOMAIN;

            if (_LIB_VERSION == _POSIX_)

               errno = EDOM;

            else if (!matherr(&exc)) {

               errno = EDOM;

            }

            exc.retval = nan("");

        }

        if (exc.err != 0)

           errno = exc.err;

        return (float)exc.retval;

#endif

}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double log(double x)

#else

        double log(x)

        double x;

#endif

{

        return (double) logf((float) x);

}

#endif /* defined(_DOUBLE_IS_32BITS) */