math/w_atan2f.c

   1 /* w_atan2f.c -- float version of w_atan2.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: w_atan2f.c,v 1.3 1995/05/10 20:48:42 jtc Exp $";
  18 #endif
  19
  20 /*
  21  * wrapper atan2f(y,x)
  22  */
  23
  24 #include <math.h>
  25 #include "math_private.h"
  26
  27
  28 #ifdef __STDC__
  29         float __atan2f(float y, float x)                /* wrapper atan2f */
  30 #else
  31         float __atan2f(y,x)                     /* wrapper atan2 */
  32         float y,x;
  33 #endif
  34 {
  35 #ifdef _IEEE_LIBM
  36         return __ieee754_atan2f(y,x);
  37 #else
  38         float z;
  39         z = __ieee754_atan2f(y,x);
  40         if(_LIB_VERSION != _SVID_||__isnanf(x)||__isnanf(y)) return z;
  41         if(x==0.0&&y==0.0)
  42           return __kernel_standard(y,x,103); /* atan2(+-0,+-0) */
  43         return z;
  44 #endif
  45 }
  46 weak_alias (__atan2f, atan2f)