1 /* Get signed integer and fractional parts of a floating-point number. 2 Copyright (C) 2012-2021 Free Software Foundation, Inc. 3 4 This file is free software: you can redistribute it and/or modify 5 it under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 3 of the 7 License, or (at your option) any later version. 8 9 This file is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public License 15 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 16 17 #include <config.h> 18 19 /* Specification. */ 20 #include <math.h> 21 22 #if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE 23 24 long double 25 modfl (long double x, long double *iptr) /* */ 26 { 27 double integer_part; 28 double fractional_part = modf (x, &integer_part); 29 *iptr = integer_part; 30 return fractional_part; 31 } 32 33 #else 34 35 long double 36 modfl (long double x, long double *iptr) /* */ 37 { 38 if (isfinite (x)) 39 { 40 long double integer_part = truncl (x); 41 *iptr = integer_part; 42 return x - integer_part; 43 } 44 else 45 { 46 if (isinf (x)) 47 { 48 *iptr = x; 49 return 1.0L / x; 50 } 51 else /* isnanl (x) */ 52 { 53 *iptr = x; 54 return x; 55 } 56 } 57 } 58 59 #endif