blob: 2ec8cb9d5e1798914d2b60587db0ce8bf86cc09b (
about) (
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
|
/* Logarithm.
Copyright (C) 2012-2017 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <math.h>
double
log (double x)
#undef log
{
if (x <= 0.0)
{
/* Work around the OSF/1 5.1 bug. */
if (x == 0.0)
/* Return -Infinity. */
return -1.0 / 0.0;
/* Work around the NetBSD 5.1, Solaris 11 2011-11 bug. */
else /* x < 0.0 */
/* Return NaN. */
return 0.0 / 0.0;
}
return log (x);
}
|
