newlib-cygwin/newlib/libm/math/wf_tgamma.c

/* w_gammaf.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 "math.h"
#include "fdlibm.h"
#include <errno.h>

#ifdef __STDC__
	float tgammaf(float x)
#else
	float tgammaf(x)
	float x;
#endif
{
        float y;
	y = __ieee754_tgammaf(x);
#ifdef _IEEE_LIBM
	return y;
#else
	if(_LIB_VERSION == _IEEE_) return y;

	if(x < 0.0 && floor(x)==x)
	    errno = EDOM;
	  else if (finite(x))
	    errno = ERANGE;
	return y;
#endif
}

#ifdef _DOUBLE_IS_32BITS

#ifdef __STDC__
	double tgamma(double x)
#else
	double tgamma(x)
	double x;
#endif
{
	return (double) tgammaf((float) x);
}

#endif /* defined(_DOUBLE_IS_32BITS) */