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c624d232 | 1 | /* Wrapper to set errno for scalb. |
2b778ceb | 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
c624d232 TMQMF |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | /* Only build wrappers from the templates for the types that define the macro | |
20 | below. This macro is set in math-type-macros-<type>.h in sysdeps/generic | |
21 | for each floating-point type. */ | |
22 | #if __USE_WRAPPER_TEMPLATE | |
23 | ||
24 | #include <errno.h> | |
25 | #include <math.h> | |
26 | #include <math_private.h> | |
27 | ||
28 | /* Wrapper scalb */ | |
29 | FLOAT M_DECL_FUNC (__scalb) (FLOAT x, FLOAT fn) | |
30 | { | |
31 | FLOAT z = M_SUF (__ieee754_scalb) (x, fn); | |
32 | ||
33 | if (__glibc_unlikely (!isfinite (z) || z == M_LIT (0.0))) | |
34 | { | |
35 | if (isnan (z)) | |
36 | { | |
37 | if (!isnan (x) && !isnan (fn)) | |
38 | __set_errno (EDOM); | |
39 | } | |
40 | else if (isinf (z)) | |
41 | { | |
42 | if (!isinf (x) && !isinf (fn)) | |
43 | __set_errno (ERANGE); | |
44 | } | |
45 | else | |
46 | { | |
47 | /* z == 0. */ | |
48 | if (x != M_LIT (0.0) && !isinf (fn)) | |
49 | __set_errno (ERANGE); | |
50 | } | |
51 | } | |
52 | return z; | |
53 | } | |
54 | ||
55 | declare_mgen_alias (__scalb, scalb); | |
56 | ||
57 | #endif /* __USE_WRAPPER_TEMPLATE. */ |