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__
log10(double x)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 }
43