summaryrefslogtreecommitdiff
path: root/sysdeps/libm-ieee754/w_log10.c
blob: 46334cefb95feea5919e95268d1629e3141cdfc5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
/* @(#)w_log10.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice 
 * is preserved.
 * ====================================================
 */

#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: w_log10.c,v 1.6 1995/05/10 20:49:35 jtc Exp $";
#endif

/* 
 * wrapper log10(X)
 */

#include "math.h"
#include "math_private.h"


#ifdef __STDC__
	double __log10(double x)		/* wrapper log10 */
#else
	double __log10(x)			/* wrapper log10 */
	double x;
#endif
{
#ifdef _IEEE_LIBM
	return __ieee754_log10(x);
#else
	double z;
	z = __ieee754_log10(x);
	if(_LIB_VERSION == _IEEE_ || __isnan(x)) return z;
	if(x<=0.0) {
	    if(x==0.0)
	        return __kernel_standard(x,x,18); /* log10(0) */
	    else 
	        return __kernel_standard(x,x,19); /* log10(x<0) */
	} else
	    return z;
#endif
}
weak_alias (__log10, log10)