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) 1992-2005, 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with System.Val_Real; use System.Val_Real;
  35
  36 package body System.Val_Dec is
  37
  38    ------------------
  39    -- Scan_Decimal --
  40    ------------------
  41
  42    --  For decimal types where Size < Integer'Size, it is fine to use
  43    --  the floating-point circuit, since it certainly has sufficient
  44    --  precision for any reasonable hardware, and we just don't support
  45    --  things on junk hardware!
  46
  47    function Scan_Decimal
  48      (Str   : String;
  49       Ptr   : access Integer;
  50       Max   : Integer;
  51       Scale : Integer) return Integer
  52    is
  53       Val : Long_Long_Float;
  54    begin
  55       Val := Scan_Real (Str, Ptr, Max);
  56       return Integer (Val * 10.0 ** Scale);
  57    end Scan_Decimal;
  58
  59    -------------------
  60    -- Value_Decimal --
  61    -------------------
  62
  63    --  Again, we use the real circuit for this purpose
  64
  65    function Value_Decimal (Str : String; Scale : Integer) return Integer is
  66    begin
  67       return Integer (Value_Real (Str) * 10.0 ** Scale);
  68    end Value_Decimal;
  69
  70 end System.Val_Dec;