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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* @(#)w_log10.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_log10.c,v 1.4 1994/08/10 20:35:15 jtc Exp $";
  16. #endif
  17.  
  18. /*
  19.  * wrapper log10(X)
  20.  */
  21.  
  22. #include "math.h"
  23. #include "math_private.h"
  24.  
  25.  
  26. #ifdef __STDC__
  27.         double log10(double x)          /* wrapper log10 */
  28. #else
  29.         double log10(x)                 /* wrapper log10 */
  30.         double x;
  31. #endif
  32. {
  33. #ifdef _IEEE_LIBM
  34.         return __ieee754_log10(x);
  35. #else
  36.         double z;
  37.         z = __ieee754_log10(x);
  38.         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  39.         if(x<=0.0) {
  40.             if(x==0.0)
  41.                 return __kernel_standard(x,x,18); /* log10(0) */
  42.             else
  43.                 return __kernel_standard(x,x,19); /* log10(x<0) */
  44.         } else
  45.             return z;
  46. #endif
  47. }
  48.