| /* Base 10 logarithmic function. |
| Copyright (C) 2012-2020 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include <math.h> |
| |
| double |
| log10 (double x) |
| #undef log10 |
| { |
| 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 11.0 bug. */ |
| else /* x < 0.0 */ |
| /* Return NaN. */ |
| return 0.0 / 0.0; |
| } |
| return log10 (x); |
| } |