gcc/ada/s-widlli.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . W I D _ L L I                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2009, 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 package body System.Wid_LLI is
  33
  34    -----------------------------
  35    -- Width_Long_Long_Integer --
  36    -----------------------------
  37
  38    function Width_Long_Long_Integer
  39      (Lo, Hi : Long_Long_Integer)
  40       return   Natural
  41    is
  42       W : Natural;
  43       T : Long_Long_Integer;
  44
  45    begin
  46       if Lo > Hi then
  47          return 0;
  48
  49       else
  50          --  Minimum value is 2, one for sign, one for digit
  51
  52          W := 2;
  53
  54          --  Get max of absolute values, but avoid bomb if we have the maximum
  55          --  negative number (note that First + 1 has same digits as First)
  56
  57          T := Long_Long_Integer'Max (
  58                 abs (Long_Long_Integer'Max (Lo, Long_Long_Integer'First + 1)),
  59                 abs (Long_Long_Integer'Max (Hi, Long_Long_Integer'First + 1)));
  60
  61          --  Increase value if more digits required
  62
  63          while T >= 10 loop
  64             T := T / 10;
  65             W := W + 1;
  66          end loop;
  67
  68          return W;
  69       end if;
  70
  71    end Width_Long_Long_Integer;
  72
  73 end System.Wid_LLI;