gcc/ada/s-vallli.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       S Y S T E M . V A L _ L L I                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.1.16.1 $
  10 --                                                                          --
  11 --   Copyright (C) 1992,1993,1994,1995,1996 Free Software Foundation, Inc.  --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System.Unsigned_Types; use System.Unsigned_Types;
  37 with System.Val_LLU;        use System.Val_LLU;
  38 with System.Val_Util;       use System.Val_Util;
  39
  40 package body System.Val_LLI is
  41
  42    ---------------------------
  43    -- Scn_Long_Long_Integer --
  44    ---------------------------
  45
  46    function Scan_Long_Long_Integer
  47      (Str  : String;
  48       Ptr  : access Integer;
  49       Max  : Integer)
  50       return Long_Long_Integer
  51    is
  52       Uval : Long_Long_Unsigned;
  53       --  Unsigned result
  54
  55       Minus : Boolean := False;
  56       --  Set to True if minus sign is present, otherwise to False
  57
  58       Start : Positive;
  59       --  Saves location of first non-blank (not used in this case)
  60
  61    begin
  62       Scan_Sign (Str, Ptr, Max, Minus, Start);
  63       Uval := Scan_Long_Long_Unsigned (Str, Ptr, Max);
  64
  65       --  Deal with overflow cases, and also with maximum negative number
  66
  67       if Uval > Long_Long_Unsigned (Long_Long_Integer'Last) then
  68          if Minus
  69            and then Uval = Long_Long_Unsigned (-(Long_Long_Integer'First)) then
  70             return Long_Long_Integer'First;
  71          else
  72             raise Constraint_Error;
  73          end if;
  74
  75       --  Negative values
  76
  77       elsif Minus then
  78          return -(Long_Long_Integer (Uval));
  79
  80       --  Positive values
  81
  82       else
  83          return Long_Long_Integer (Uval);
  84       end if;
  85
  86    end Scan_Long_Long_Integer;
  87
  88    -----------------------------
  89    -- Value_Long_Long_Integer --
  90    -----------------------------
  91
  92    function Value_Long_Long_Integer (Str : String) return Long_Long_Integer is
  93       V : Long_Long_Integer;
  94       P : aliased Integer := Str'First;
  95
  96    begin
  97       V := Scan_Long_Long_Integer (Str, P'Access, Str'Last);
  98       Scan_Trailing_Blanks (Str, P);
  99       return V;
 100
 101    end Value_Long_Long_Integer;
 102
 103 end System.Val_LLI;