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 M_DECL_FUNC(__tgamma)33M_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