gcc/ada/s-widllu.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . W I D _ L L U                        --
   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.Unsigned_Types; use System.Unsigned_Types;
  35
  36 package body System.Wid_LLU is
  37
  38    ------------------------------
  39    -- Width_Long_Long_Unsigned --
  40    ------------------------------
  41
  42    function Width_Long_Long_Unsigned
  43      (Lo, Hi : Long_Long_Unsigned)
  44       return   Natural
  45    is
  46       W : Natural;
  47       T : Long_Long_Unsigned;
  48
  49    begin
  50       if Lo > Hi then
  51          return 0;
  52
  53       else
  54          --  Minimum value is 2, one for sign, one for digit
  55
  56          W := 2;
  57
  58          --  Get max of absolute values, but avoid bomb if we have the maximum
  59          --  negative number (note that First + 1 has same digits as First)
  60
  61          T := Long_Long_Unsigned'Max (Lo, Hi);
  62
  63          --  Increase value if more digits required
  64
  65          while T >= 10 loop
  66             T := T / 10;
  67             W := W + 1;
  68          end loop;
  69
  70          return W;
  71       end if;
  72
  73    end Width_Long_Long_Unsigned;
  74
  75 end System.Wid_LLU;