1 /* Copyright (C) 2011-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <fenv.h>
19 #include <math.h>
20 #include <math_private.h>
21 #include <math-svid-compat.h>
22 #include <libm-alias-double.h>
23
24
25 #if LIBM_SVID_COMPAT
26 /* wrapper log10(x) */
27 double
__log10(double x)28 __log10 (double x)
29 {
30 if (__builtin_expect (islessequal (x, 0.0), 0) && _LIB_VERSION != _IEEE_)
31 {
32 if (x == 0.0)
33 {
34 __feraiseexcept (FE_DIVBYZERO);
35 return __kernel_standard (x, x, 18); /* log10(0) */
36 }
37 else
38 {
39 __feraiseexcept (FE_INVALID);
40 return __kernel_standard (x, x, 19); /* log10(x<0) */
41 }
42 }
43
44 return __ieee754_log10 (x);
45 }
46 libm_alias_double (__log10, log10)
47 #endif
48