1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . V A L _ I N T --
11 -- Copyright (C) 1992,1993,1994,1995,1996 Free Software Foundation, Inc. --
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. --
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. --
31 -- GNAT was originally developed by the GNAT team at New York University. --
32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
34 ------------------------------------------------------------------------------
36 with System.Unsigned_Types; use System.Unsigned_Types;
37 with System.Val_Uns; use System.Val_Uns;
38 with System.Val_Util; use System.Val_Util;
40 package body System.Val_Int is
55 Minus : Boolean := False;
56 -- Set to True if minus sign is present, otherwise to False
59 -- Saves location of first non-blank (not used in this case)
62 Scan_Sign (Str, Ptr, Max, Minus, Start);
63 Uval := Scan_Unsigned (Str, Ptr, Max);
65 -- Deal with overflow cases, and also with maximum negative number
67 if Uval > Unsigned (Integer'Last) then
68 if Minus and then Uval = Unsigned (-(Integer'First)) then
71 raise Constraint_Error;
77 return -(Integer (Uval));
82 return Integer (Uval);
91 function Value_Integer (Str : String) return Integer is
93 P : aliased Integer := Str'First;
96 V := Scan_Integer (Str, P'Access, Str'Last);
97 Scan_Trailing_Blanks (Str, P);