1 | /* Wrapper to set errno for scalb. |
2 | Copyright (C) 2020-2022 Free Software Foundation, Inc. |
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. */ |
58 | |