source: trunk/libs/newlib/src/newlib/libm/mathfp/sf_tgamma.c @ 503

/* 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 <errno.h>

#ifdef __STDC__
        float tgammaf(float x)
#else
        float tgammaf(x)
        float x;
#endif
{
        float y;
        int local_signgam;
        y = gammaf_r(x,&local_signgam);
        if (local_signgam < 0) y = -y;
#ifdef _IEEE_LIBM
        return y;
#else
        if(_LIB_VERSION == _IEEE_) return y;

        if(!finitef(y)&&finitef(x)) {
          if(floorf(x)==x&&x<=(float)0.0)
            {
              /* tgammaf pole */
              errno = EDOM;
              return HUGE_VAL;
            }
          else
            {
              /* tgammaf overflow */
              errno = ERANGE;
              return HUGE_VAL;
            }
        }
        return y;
#endif
}