source: trunk/sys/libm/w_atan2.c @ 57

/* @(#)w_atan2.c 5.1 93/09/24 */
/*
 * ====================================================
 * 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 atan2(y,x)
 */

#include <libm/fdlibm.h>


#ifdef __STDC__
        double atan2(double y, double x)        /* wrapper atan2 */
#else
        double atan2(y,x)                       /* wrapper atan2 */
        double y,x;
#endif
{
#ifdef _IEEE_LIBM
        return __ieee754_atan2(y,x);
#else
        double z;
        z = __ieee754_atan2(y,x);
        if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
        if(x==0.0&&y==0.0) {
                return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
        } else
            return z;
#endif
}