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Annotation of src/lib/libm/src/w_atan2.c, Revision 1.2

1.1       jtc         1:
                      2: /* @(#)w_atan2.c 5.1 93/09/24 */
                      3: /*
                      4:  * ====================================================
                      5:  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
                      6:  *
                      7:  * Developed at SunPro, a Sun Microsystems, Inc. business.
                      8:  * Permission to use, copy, modify, and distribute this
                      9:  * software is freely granted, provided that this notice
                     10:  * is preserved.
                     11:  * ====================================================
                     12:  *
                     13:  */
                     14:
                     15: /*
                     16:  * wrapper atan2(y,x)
                     17:  */
                     18:
1.2     ! jtc        19: #include <math.h>
1.1       jtc        20:
                     21:
                     22: #ifdef __STDC__
                     23:        double atan2(double y, double x)        /* wrapper atan2 */
                     24: #else
                     25:        double atan2(y,x)                       /* wrapper atan2 */
                     26:        double y,x;
                     27: #endif
                     28: {
                     29: #ifdef _IEEE_LIBM
                     30:        return __ieee754_atan2(y,x);
                     31: #else
                     32:        double z;
                     33:        z = __ieee754_atan2(y,x);
                     34:        if(_LIB_VERSION == _IEEE_||isnan(x)||isnan(y)) return z;
                     35:        if(x==0.0&&y==0.0) {
                     36:                return __kernel_standard(y,x,3); /* atan2(+-0,+-0) */
                     37:        } else
                     38:            return z;
                     39: #endif
                     40: }

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