/*========================================================================
//
//      single/ieee754-api/wf_gamma.c
//
//      Part of the standard mathematical function library
//
//========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####                                            
// -------------------------------------------                              
// This file is part of eCos, the Embedded Configurable Operating System.   
// Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
// Copyright (C) 2004 eCosCentric Limited                                   
//
// eCos is free software; you can redistribute it and/or modify it under    
// the terms of the GNU General Public License as published by the Free     
// Software Foundation; either version 2 or (at your option) any later      
// version.                                                                 
//
// eCos is distributed in the hope that it will be useful, but WITHOUT      
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or    
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    
// for more details.                                                        
//
// You should have received a copy of the GNU General Public License        
// along with eCos; if not, write to the Free Software Foundation, Inc.,    
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.            
//
// As a special exception, if other files instantiate templates or use      
// macros or inline functions from this file, or you compile this file      
// and link it with other works to produce a work based on this file,       
// this file does not by itself cause the resulting work to be covered by   
// the GNU General Public License. However the source code for this file    
// must still be made available in accordance with section (3) of the GNU   
// General Public License v2.                                               
//
// This exception does not invalidate any other reasons why a work based    
// on this file might be covered by the GNU General Public License.         
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// ####ECOSGPLCOPYRIGHTEND####                                              
//========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     jlarmour
// Contributors:  
// Date:          2004-02-30
// Purpose:       
// Description:   Derived from newlib libm
//                http://sources.redhat.com/newlib
//                in turn based on SunSoft fdlibm.
//                See copyright/license information below.
// Usage:         #include <math.h>
//
//####DESCRIPTIONEND####
//======================================================================*/

/* wf_gamma.c -- float version of w_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.
 * ====================================================
 *
 */

#include "mathincl/fdlibm.h"
/* #include <reent.h> */
#include <errno.h>

#ifdef __STDC__
	float gammaf(float x)
#else
	float gammaf(x)
	float x;
#endif
{
#ifdef _IEEE_LIBM
	return __ieee754_gammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
#else
        float y;
	struct exception exc;
        y = __ieee754_gammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
        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
	    if(floorf(x)==x&&x<=(float)0.0) {
		/* gammaf(-integer) or gammaf(0) */
		exc.type = SING;
		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 (_LIB_VERSION == _POSIX_)
		  errno = EDOM;
		else if (!matherr(&exc)) {
		  errno = EDOM;
		}
            } else {
		/* gammaf(finite) overflow */
		exc.type = OVERFLOW;
		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 (_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
}             

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
	double gamma(double x)
#else
	double gamma(x)
	double x;
#endif
{
	return (double) gammaf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */

// EOF wf_gamma.c
