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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* @(#)w_j0.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. #if defined(LIBM_SCCS) && !defined(lint)
  15. static char rcsid[] = "$Id: w_j0.c,v 1.4 1994/08/10 20:34:29 jtc Exp $";
  16. #endif
  17.  
  18. /*
  19.  * wrapper j0(double x), y0(double x)
  20.  */
  21.  
  22. #include "math.h"
  23. #include "math_private.h"
  24.  
  25. #ifdef __STDC__
  26.         double j0(double x)             /* wrapper j0 */
  27. #else
  28.         double j0(x)                    /* wrapper j0 */
  29.         double x;
  30. #endif
  31. {
  32. #ifdef _IEEE_LIBM
  33.         return __ieee754_j0(x);
  34. #else
  35.         double z = __ieee754_j0(x);
  36.         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  37.         if(fabs(x)>X_TLOSS) {
  38.                 return __kernel_standard(x,x,34); /* j0(|x|>X_TLOSS) */
  39.         } else
  40.             return z;
  41. #endif
  42. }
  43.  
  44. #ifdef __STDC__
  45.         double y0(double x)             /* wrapper y0 */
  46. #else
  47.         double y0(x)                    /* wrapper y0 */
  48.         double x;
  49. #endif
  50. {
  51. #ifdef _IEEE_LIBM
  52.         return __ieee754_y0(x);
  53. #else
  54.         double z;
  55.         z = __ieee754_y0(x);
  56.         if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z;
  57.         if(x <= 0.0){
  58.                 if(x==0.0)
  59.                     /* d= -one/(x-x); */
  60.                     return __kernel_standard(x,x,8);
  61.                 else
  62.                     /* d = zero/(x-x); */
  63.                     return __kernel_standard(x,x,9);
  64.         }
  65.         if(x>X_TLOSS) {
  66.                 return __kernel_standard(x,x,35); /* y0(x>X_TLOSS) */
  67.         } else
  68.             return z;
  69. #endif
  70. }
  71.