gcc/ada/libgnat/s-vallld.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . V A L _ L L D                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2020, 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 with System.Val_Real; use System.Val_Real;
  33
  34 package body System.Val_LLD is
  35
  36    ----------------------------
  37    -- Scan_Long_Long_Decimal --
  38    ----------------------------
  39
  40    --  We use the floating-point circuit for now, this will be OK on a PC,
  41    --  but definitely does NOT have the required precision if the longest
  42    --  float type is IEEE double. This must be fixed in the future ???
  43
  44    function Scan_Long_Long_Decimal
  45      (Str   : String;
  46       Ptr   : not null access Integer;
  47       Max   : Integer;
  48       Scale : Integer) return Long_Long_Integer
  49    is
  50       Val : Long_Long_Float;
  51    begin
  52       Val := Scan_Real (Str, Ptr, Max);
  53       return Long_Long_Integer (Val * 10.0 ** Scale);
  54    end Scan_Long_Long_Decimal;
  55
  56    -----------------------------
  57    -- Value_Long_Long_Decimal --
  58    -----------------------------
  59
  60    --  Again we cheat and use floating-point ???
  61
  62    function Value_Long_Long_Decimal
  63      (Str   : String;
  64       Scale : Integer) return Long_Long_Integer
  65    is
  66    begin
  67       return Long_Long_Integer (Value_Real (Str) * 10.0 ** Scale);
  68    end Value_Long_Long_Decimal;
  69
  70 end System.Val_LLD;