1  /* Split a double into fraction and mantissa, for hexadecimal printf.
       2     Copyright (C) 2007, 2009-2021 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 2.1 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  /* Write a finite, positive number x as
      18       x = mantissa * 2^exp
      19     where exp >= DBL_MIN_EXP - 1,
      20           mantissa < 2.0,
      21           if x is not a denormalized number then mantissa >= 1.0.
      22     Store exp in *EXPPTR and return mantissa.  */
      23  extern double printf_frexp (double x, int *expptr);