sysdeps/generic/w_log10f.c

   1 /* w_log10f.c -- float version of w_log10.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_log10f.c,v 1.3 1995/05/10 20:49:37 jtc Exp $";
  18 #endif
  19
  20 /*
  21  * wrapper log10f(X)
  22  */
  23
  24 #include "math.h"
  25 #include "math_private.h"
  26
  27
  28 #ifdef __STDC__
  29         float __log10f(float x)         /* wrapper log10f */
  30 #else
  31         float __log10f(x)                       /* wrapper log10f */
  32         float x;
  33 #endif
  34 {
  35 #ifdef _IEEE_LIBM
  36         return __ieee754_log10f(x);
  37 #else
  38         float z;
  39         z = __ieee754_log10f(x);
  40         if(_LIB_VERSION == _IEEE_ || __isnanf(x)) return z;
  41         if(x<=(float)0.0) {
  42             if(x==(float)0.0)
  43                 /* log10(0) */
  44                 return (float)__kernel_standard((double)x,(double)x,118);
  45             else
  46                 /* log10(x<0) */
  47                 return (float)__kernel_standard((double)x,(double)x,119);
  48         } else
  49             return z;
  50 #endif
  51 }
  52 weak_alias (__log10f, log10f)