Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | Download | RSS feed

  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* w_scalbf.c -- float version of w_scalb.c.
  3.  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
  4.  */
  5.  
  6. /*
  7.  * ====================================================
  8.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  9.  *
  10.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  11.  * Permission to use, copy, modify, and distribute this
  12.  * software is freely granted, provided that this notice
  13.  * is preserved.
  14.  * ====================================================
  15.  */
  16.  
  17. #if defined(LIBM_SCCS) && !defined(lint)
  18. static char rcsid[] = "$Id: w_scalbf.c,v 1.1 1994/08/10 20:35:40 jtc Exp $";
  19. #endif
  20.  
  21. /*
  22.  * wrapper scalbf(float x, float fn) is provide for
  23.  * passing various standard test suite. One
  24.  * should use scalbn() instead.
  25.  */
  26.  
  27. #include "math.h"
  28. #include "math_private.h"
  29.  
  30. #include <errno.h>
  31.  
  32. #ifdef __STDC__
  33. #ifdef _SCALB_INT
  34.         float scalbf(float x, int fn)           /* wrapper scalbf */
  35. #else
  36.         float scalbf(float x, float fn)         /* wrapper scalbf */
  37. #endif
  38. #else
  39.         float scalbf(x,fn)                      /* wrapper scalbf */
  40. #ifdef _SCALB_INT
  41.         float x; int fn;
  42. #else
  43.         float x,fn;
  44. #endif
  45. #endif
  46. {
  47. #ifdef _IEEE_LIBM
  48.         return __ieee754_scalbf(x,fn);
  49. #else
  50.         float z;
  51.         z = __ieee754_scalbf(x,fn);
  52.         if(_LIB_VERSION == _IEEE_) return z;
  53.         if(!(finitef(z)||isnanf(z))&&finitef(x)) {
  54.             /* scalbf overflow */
  55.             return (float)__kernel_standard((double)x,(double)fn,132);
  56.         }
  57.         if(z==(float)0.0&&z!=x) {
  58.             /* scalbf underflow */
  59.             return (float)__kernel_standard((double)x,(double)fn,133);
  60.         }
  61. #ifndef _SCALB_INT
  62.         if(!finitef(fn)) errno = ERANGE;
  63. #endif
  64.         return z;
  65. #endif
  66. }
  67.