gcc/ada/s-valdec.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . V A L _ D E C                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2013, 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_Dec is
  35
  36    ------------------
  37    -- Scan_Decimal --
  38    ------------------
  39
  40    --  For decimal types where Size < Integer'Size, it is fine to use
  41    --  the floating-point circuit, since it certainly has sufficient
  42    --  precision for any reasonable hardware, and we just don't support
  43    --  things on junk hardware.
  44
  45    function Scan_Decimal
  46      (Str   : String;
  47       Ptr   : not null access Integer;
  48       Max   : Integer;
  49       Scale : Integer) return Integer
  50    is
  51       Val : Long_Long_Float;
  52    begin
  53       Val := Scan_Real (Str, Ptr, Max);
  54       return Integer (Val * 10.0 ** Scale);
  55    end Scan_Decimal;
  56
  57    -------------------
  58    -- Value_Decimal --
  59    -------------------
  60
  61    --  Again, we use the real circuit for this purpose
  62
  63    function Value_Decimal (Str : String; Scale : Integer) return Integer is
  64    begin
  65       return Integer (Value_Real (Str) * 10.0 ** Scale);
  66    end Value_Decimal;
  67
  68 end System.Val_Dec;