1 | /* Wrapper to set errno for tgamma. |
2 | Copyright (C) 2017-2022 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 | <https://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 <fenv.h> |
26 | # include <math.h> |
27 | # include <math_private.h> |
28 | |
29 | #define M_CALL_FUNC_X(x) x ## _r |
30 | #define M_CALL_FUNC(x) M_CALL_FUNC_X (x) |
31 | |
32 | FLOAT |
33 | M_DECL_FUNC (__tgamma) (FLOAT x) |
34 | { |
35 | int local_signgam; |
36 | FLOAT y = M_CALL_FUNC (M_SUF (__ieee754_gamma)) (x, &local_signgam); |
37 | |
38 | if (__glibc_unlikely (!isfinite (y) || y == 0) |
39 | && (isfinite (x) || (isinf (x) && x < 0))) |
40 | { |
41 | if (x == 0) |
42 | /* Pole error: tgamma(x=0). */ |
43 | __set_errno (ERANGE); |
44 | else if (M_SUF (floor) (x) == x && x < 0) |
45 | /* Domain error: tgamma(integer x<0). */ |
46 | __set_errno (EDOM); |
47 | else |
48 | /* Overflow or underflow. */ |
49 | __set_errno (ERANGE); |
50 | } |
51 | return local_signgam < 0 ? -y : y; |
52 | } |
53 | declare_mgen_alias (__tgamma, tgamma) |
54 | |
55 | #endif /* __USE_WRAPPER_TEMPLATE. */ |
56 | |