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 double 23 modf (double x, double *iptr) /* */ 24 { 25 if (isfinite (x)) 26 { 27 double integer_part = trunc (x); 28 *iptr = integer_part; 29 return x - integer_part; 30 } 31 else 32 { 33 if (isinf (x)) 34 { 35 *iptr = x; 36 return 1.0 / x; 37 } 38 else /* isnand (x) */ 39 { 40 *iptr = x; 41 return x; 42 } 43 } 44 }