| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . V A L _ I N T -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 1992-2006, Free Software Foundation, Inc. -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 2, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- |
| -- for more details. You should have received a copy of the GNU General -- |
| -- Public License distributed with GNAT; see file COPYING. If not, write -- |
| -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- |
| -- Boston, MA 02110-1301, USA. -- |
| -- -- |
| -- As a special exception, if other files instantiate generics from this -- |
| -- unit, or you link this unit with other files to produce an executable, -- |
| -- this unit does not by itself cause the resulting executable to be -- |
| -- covered by the GNU General Public License. This exception does not -- |
| -- however invalidate any other reasons why the executable file might be -- |
| -- covered by the GNU Public License. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with System.Unsigned_Types; use System.Unsigned_Types; |
| with System.Val_Uns; use System.Val_Uns; |
| with System.Val_Util; use System.Val_Util; |
| |
| package body System.Val_Int is |
| |
| ------------------ |
| -- Scan_Integer -- |
| ------------------ |
| |
| function Scan_Integer |
| (Str : String; |
| Ptr : access Integer; |
| Max : Integer) return Integer |
| is |
| Uval : Unsigned; |
| -- Unsigned result |
| |
| Minus : Boolean := False; |
| -- Set to True if minus sign is present, otherwise to False |
| |
| Start : Positive; |
| -- Saves location of first non-blank (not used in this case) |
| |
| begin |
| Scan_Sign (Str, Ptr, Max, Minus, Start); |
| |
| if Str (Ptr.all) not in '0' .. '9' then |
| Ptr.all := Start; |
| raise Constraint_Error; |
| end if; |
| |
| Uval := Scan_Raw_Unsigned (Str, Ptr, Max); |
| |
| -- Deal with overflow cases, and also with maximum negative number |
| |
| if Uval > Unsigned (Integer'Last) then |
| if Minus and then Uval = Unsigned (-(Integer'First)) then |
| return Integer'First; |
| else |
| raise Constraint_Error; |
| end if; |
| |
| -- Negative values |
| |
| elsif Minus then |
| return -(Integer (Uval)); |
| |
| -- Positive values |
| |
| else |
| return Integer (Uval); |
| end if; |
| end Scan_Integer; |
| |
| ------------------- |
| -- Value_Integer -- |
| ------------------- |
| |
| function Value_Integer (Str : String) return Integer is |
| V : Integer; |
| P : aliased Integer := Str'First; |
| begin |
| V := Scan_Integer (Str, P'Access, Str'Last); |
| Scan_Trailing_Blanks (Str, P); |
| return V; |
| end Value_Integer; |
| |
| end System.Val_Int; |
