gcc/ada/libgnat/s-imglfl.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                      S Y S T E M . I M G _ L F L T                       --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --            Copyright (C) 2021-2023, Free Software Foundation, Inc.       --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package contains routines for the Image attribute of fixed or floating
  33 --  point types based on Long_Float, also used for Float_IO/Fixed_IO output.
  34
  35 with System.Img_LLU;
  36 with System.Image_R;
  37 with System.Powten_LFlt;
  38 with System.Unsigned_Types;
  39
  40 package System.Img_LFlt is
  41
  42    --  Note that the following instantiation is really for a 32-bit target,
  43    --  where 128-bit integer types are not available. For a 64-bit targaet,
  44    --  it is possible to use Long_Long_Unsigned and Long_Long_Long_Unsigned
  45    --  instead of Unsigned and Long_Long_Unsigned, in order to double the
  46    --  number of significant digits. But we do not do it by default to avoid
  47    --  dragging 128-bit integer types for the sake of backward compatibility.
  48
  49    package Impl is new Image_R
  50      (Long_Float,
  51       System.Powten_LFlt.Maxpow,
  52       System.Powten_LFlt.Powten'Address,
  53       Unsigned_Types.Long_Long_Unsigned,
  54       System.Img_LLU.Set_Image_Long_Long_Unsigned);
  55
  56    procedure Image_Fixed
  57      (V   : Long_Float;
  58       S   : in out String;
  59       P   : out Natural;
  60       Aft : Natural)
  61      renames Impl.Image_Fixed_Point;
  62
  63    procedure Image_Long_Float
  64      (V    : Long_Float;
  65       S    : in out String;
  66       P    : out Natural;
  67       Digs : Natural)
  68      renames Impl.Image_Floating_Point;
  69
  70    procedure Set_Image_Long_Float
  71      (V    : Long_Float;
  72       S    : in out String;
  73       P    : in out Natural;
  74       Fore : Natural;
  75       Aft  : Natural;
  76       Exp  : Natural)
  77      renames Impl.Set_Image_Real;
  78
  79 end System.Img_LFlt;