| 1 | /* Wrapper to set errno for log. |
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| 2 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | /* Only build wrappers from the templates for the types that define the macro |
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| 20 | below. This macro is set in math-type-macros-<type>.h in sysdeps/generic |
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| 21 | for each floating-point type. */ |
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| 22 | #if __USE_WRAPPER_TEMPLATE |
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| 23 | |
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| 24 | # include <errno.h> |
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| 25 | # include <fenv.h> |
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| 26 | # include <math.h> |
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| 27 | # include <math_private.h> |
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| 28 | |
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| 29 | FLOAT |
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| 30 | M_DECL_FUNC (__log) (FLOAT x) |
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| 31 | { |
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| 32 | if (__glibc_unlikely (islessequal (x, M_LIT (0.0)))) |
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| 33 | { |
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| 34 | if (x == 0) |
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| 35 | /* Pole error: log(0). */ |
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| 36 | __set_errno (ERANGE); |
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| 37 | else |
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| 38 | /* Domain error: log(<0). */ |
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| 39 | __set_errno (EDOM); |
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| 40 | } |
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| 41 | return M_SUF (__ieee754_log) (x); |
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| 42 | } |
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| 43 | declare_mgen_alias (__log, log) |
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| 44 | |
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| 45 | #endif /* __USE_WRAPPER_TEMPLATE. */ |
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| 46 | |
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