1/* Copyright (C) 2011-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <fenv.h>
20#include <math.h>
21#include <math_private.h>
22
23
24/* wrapper log10(x) */
25double
26__log10 (double x)
27{
28 if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_)
29 {
30 if (x == 0.0)
31 {
32 __feraiseexcept (FE_DIVBYZERO);
33 return __kernel_standard (x, x, 18); /* log10(0) */
34 }
35 else
36 {
37 __feraiseexcept (FE_INVALID);
38 return __kernel_standard (x, x, 19); /* log10(x<0) */
39 }
40 }
41
42 return __ieee754_log10 (x);
43}
44weak_alias (__log10, log10)
45#ifdef NO_LONG_DOUBLE
46strong_alias (__log10, __log10l)
47weak_alias (__log10, log10l)
48#endif
49