gcc/ada/s-widlli.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                       S Y S T E M . W I D _ L L I                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --        Copyright (C) 1992,1993,1994 Free Software Foundation, Inc.       --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNAT was originally developed  by the GNAT team at  New York University. --
  31 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 package body System.Wid_LLI is
  36
  37    -----------------------------
  38    -- Width_Long_Long_Integer --
  39    -----------------------------
  40
  41    function Width_Long_Long_Integer
  42      (Lo, Hi : Long_Long_Integer)
  43       return   Natural
  44    is
  45       W : Natural;
  46       T : Long_Long_Integer;
  47
  48    begin
  49       if Lo > Hi then
  50          return 0;
  51
  52       else
  53          --  Minimum value is 2, one for sign, one for digit
  54
  55          W := 2;
  56
  57          --  Get max of absolute values, but avoid bomb if we have the maximum
  58          --  negative number (note that First + 1 has same digits as First)
  59
  60          T := Long_Long_Integer'Max (
  61                 abs (Long_Long_Integer'Max (Lo, Long_Long_Integer'First + 1)),
  62                 abs (Long_Long_Integer'Max (Hi, Long_Long_Integer'First + 1)));
  63
  64          --  Increase value if more digits required
  65
  66          while T >= 10 loop
  67             T := T / 10;
  68             W := W + 1;
  69          end loop;
  70
  71          return W;
  72       end if;
  73
  74    end Width_Long_Long_Integer;
  75
  76 end System.Wid_LLI;