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  1. /* wf_log10.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. /*
  17.  * wrapper log10f(X)
  18.  */
  19.  
  20. #include "fdlibm.h"
  21. #include <errno.h>
  22.  
  23. #ifdef __STDC__
  24.         float log10f(float x)           /* wrapper log10f */
  25. #else
  26.         float log10f(x)                 /* wrapper log10f */
  27.         float x;
  28. #endif
  29. {
  30. #ifdef _IEEE_LIBM
  31.         return __ieee754_log10f(x);
  32. #else
  33.         float z;
  34.         struct exception exc;
  35.         z = __ieee754_log10f(x);
  36.         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  37.         if(x<=(float)0.0) {
  38. #ifndef HUGE_VAL
  39. #define HUGE_VAL inf
  40.             double inf = 0.0;
  41.  
  42.             SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
  43. #endif
  44.             exc.name = "log10f";
  45.             exc.err = 0;
  46.             exc.arg1 = exc.arg2 = (double)x;
  47.             if (_LIB_VERSION == _SVID_)
  48.                exc.retval = -HUGE;
  49.             else
  50.                exc.retval = -HUGE_VAL;
  51.             if(x==(float)0.0) {
  52.                 /* log10f(0) */
  53.                 exc.type = SING;
  54.                 if (_LIB_VERSION == _POSIX_)
  55.                    errno = ERANGE;
  56.                 else if (!matherr(&exc)) {
  57.                    errno = ERANGE;
  58.                 }
  59.             } else {
  60.                 /* log10f(x<0) */
  61.                 exc.type = DOMAIN;
  62.                 if (_LIB_VERSION == _POSIX_)
  63.                    errno = EDOM;
  64.                 else if (!matherr(&exc)) {
  65.                    errno = EDOM;
  66.                 }
  67.                 exc.retval = nan("");
  68.             }
  69.             if (exc.err != 0)
  70.                errno = exc.err;
  71.             return (float)exc.retval;
  72.         } else
  73.             return z;
  74. #endif
  75. }
  76.  
  77. #ifdef _DOUBLE_IS_32BITS
  78.  
  79. #ifdef __STDC__
  80.         double log10(double x)
  81. #else
  82.         double log10(x)
  83.         double x;
  84. #endif
  85. {
  86.         return (double) log10f((float) x);
  87. }
  88.  
  89. #endif /* defined(_DOUBLE_IS_32BITS) */
  90.