1/* Wrapper to set errno for log.
2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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 <https://www.gnu.org/licenses/>. */
18
19/* Only build wrappers from the templates for the types that define the macro
20 below. This macro is set in math-type-macros-<type>.h in sysdeps/generic
21 for each floating-point type. */
22#if __USE_WRAPPER_TEMPLATE
23
24# include <errno.h>
25# include <fenv.h>
26# include <math.h>
27# include <math_private.h>
28
29FLOAT
30M_DECL_FUNC (__log) (FLOAT x)
31{
32 if (__glibc_unlikely (islessequal (x, M_LIT (0.0))))
33 {
34 if (x == 0)
35 /* Pole error: log(0). */
36 __set_errno (ERANGE);
37 else
38 /* Domain error: log(<0). */
39 __set_errno (EDOM);
40 }
41 return M_SUF (__ieee754_log) (x);
42}
43declare_mgen_alias (__log, log)
44
45#endif /* __USE_WRAPPER_TEMPLATE. */
46