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w_log10.c
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1 
2 /* @(#)w_log10.c 1.3 95/01/18 */
3 /*
4  * ====================================================
5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6  *
7  * Developed at SunSoft, 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 /*
15  * wrapper log10(X)
16  */
17 
18 #include "fdlibm.h"
19 
20 
21 #ifdef __STDC__
22  double log10(double x) /* wrapper log10 */
23 #else
24  double log10(x) /* wrapper log10 */
25  double x;
26 #endif
27 {
28 #ifdef _IEEE_LIBM
29  return __ieee754_log10(x);
30 #else
31  double z;
32  z = __ieee754_log10(x);
33  if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
34  if(x<=0.0) {
35  if(x==0.0)
36  return __kernel_standard(x,x,18); /* log10(0) */
37  else
38  return __kernel_standard(x,x,19); /* log10(x<0) */
39  } else
40  return z;
41 #endif
42 }