Subversion Repositories shark

Rev

Rev 1618 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
2 pj 1
/* @(#)w_atan2.c 5.1 93/09/24 */
2
/*
3
 * ====================================================
4
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5
 *
6
 * Developed at SunPro, a Sun Microsystems, Inc. business.
7
 * Permission to use, copy, modify, and distribute this
8
 * software is freely granted, provided that this notice
9
 * is preserved.
10
 * ====================================================
11
 */
12
 
13
#ifndef lint
14
static char rcsid[] = "$\Id: w_atan2.c,v 1.2 1995/05/30 05:50:43 rgrimes Exp $";
15
#endif
16
 
17
/*
18
 * wrapper atan2(y,x)
19
 */
20
 
21
#include "math.h"
22
#include "math_private.h"
23
 
24
 
25
#ifdef __STDC__
26
        double atan2(double y, double x)        /* wrapper atan2 */
27
#else
28
        double atan2(y,x)                       /* wrapper atan2 */
29
        double y,x;
30
#endif
31
{
32
#ifdef _IEEE_LIBM
33
        return __ieee754_atan2(y,x);
34
#else
35
        double z;
36
        z = __ieee754_atan2(y,x);
37
        if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
38
        if(x==0.0&&y==0.0) {
39
                return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
40
        } else
41
            return z;
42
#endif
43
}