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/* wrf_gamma.c -- float version of wr_gamma.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 float gammaf_r(float x, int *signgamp)

 */

#include "fdlibm.h"

#include <errno.h>

#ifdef __STDC__

        float gammaf_r(float x, int *signgamp) /* wrapper lgammaf_r */

#else

        float gammaf_r(x,signgamp)              /* wrapper lgammaf_r */

        float x; int *signgamp;

#endif

{

#ifdef _IEEE_LIBM

        return __ieee754_gammaf_r(x,signgamp);

#else

        float y;

        struct exception exc;

        y = __ieee754_gammaf_r(x,signgamp);

        if(_LIB_VERSION == _IEEE_) return y;

        if(!finitef(y)&&finitef(x)) {

#ifndef HUGE_VAL 

#define HUGE_VAL inf

            double inf = 0.0;

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

#endif

            exc.name = "gammaf";

            exc.err = 0;

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

            if (_LIB_VERSION == _SVID_)

                exc.retval = HUGE;

            else

                exc.retval = HUGE_VAL;

            if(floorf(x)==x&&x<=(float)0.0) {

                /* gammaf(-integer) or gamma(0) */

                exc.type = SING;

                if (_LIB_VERSION == _POSIX_)

                  errno = EDOM;

                else if (!matherr(&exc)) {

                  errno = EDOM;

                }

            } else {

                /* gammaf(finite) overflow */

                exc.type = OVERFLOW;

                if (_LIB_VERSION == _POSIX_)

                  errno = ERANGE;

                else if (!matherr(&exc)) {

                  errno = ERANGE;

                }

            }

            if (exc.err != 0)

               errno = exc.err;

            return (float)exc.retval;

        } else

            return y;

#endif

}