Mercurial > gnulib
view lib/log10.c @ 39208:7bfe1e1d4698
Fix -Wundef warning in user-included header lib/cdefs.h.
* lib/cdefs.h: Check if defined before using __USE_FORTIFY_LEVEL.
author | Tim Rühsen <tim.ruehsen@gmx.de> |
---|---|
date | Wed, 03 Jan 2018 11:50:07 +0100 |
parents | 24e347e0e326 |
children | b06060465f09 |
line wrap: on
line source
/* Base 10 logarithmic function. Copyright (C) 2012-2018 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); }