fchmod-tests, fchmodat tests, lchmod tests: Add more tests.
[gnulib.git] / lib / log10f.c
blobeea5355ea9d81905d9fe97f7356fb54d2cded69f
1 /* Base 10 logarithmic function.
2 Copyright (C) 2011-2021 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
17 #include <config.h>
19 /* Specification. */
20 #include <math.h>
22 float
23 log10f (float x)
24 #undef log10f
26 #if HAVE_LOG10F
27 if (x <= 0.0f)
29 /* Work around the OSF/1 5.1 bug. */
30 if (x == 0.0f)
31 /* Return -Infinity. */
32 return -1.0f / 0.0f;
33 /* Work around the NetBSD 5.1 bug. */
34 else /* x < 0.0 */
35 /* Return NaN. */
36 return 0.0f / 0.0f;
38 return log10f (x);
39 #else
40 return (float) log10 ((double) x);
41 #endif