Mercurial > gnulib
view lib/logf.c @ 40201:24f6637d57d0
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author | Karl Berry <karl@freefriends.org> |
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date | Sun, 24 Feb 2019 08:05:56 -0800 |
parents | b06060465f09 |
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/* Natural logarithmic function. Copyright (C) 2011-2019 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> float logf (float x) #undef logf { #if HAVE_LOGF if (x <= 0.0f) { /* Work around the OSF/1 5.1 bug. */ if (x == 0.0f) /* Return -Infinity. */ return -1.0f / 0.0f; /* Work around the NetBSD 5.1 bug. */ else /* x < 0.0 */ /* Return NaN. */ return 0.0f / 0.0f; } return logf (x); #else return (float) log ((double) x); #endif }