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38 lines
1.0 KiB
C
38 lines
1.0 KiB
C
/* Natural logarithmic function.
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Copyright (C) 2011-2026 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include <math.h>
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float
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logf (float x)
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#undef logf
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{
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#if HAVE_LOGF
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if (x < 0.0f)
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{
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/* Work around the NetBSD 5.1 bug. */
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/* Return NaN. */
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return 0.0f / 0.0f;
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}
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return logf (x);
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#else
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return (float) log ((double) x);
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#endif
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}
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