source: trunk/sys/libm/w_log10.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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[1]1
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/*
15 * wrapper log10(X)
16 */
17
18#include <libm/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}
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