-- --
-- B o d y --
-- --
--- --
--- Copyright (C) 1992-1997 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2009, 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- --
+-- ware Foundation; either version 3, 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
-- --
--- 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. --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
package body System.Val_Uns is
- -------------------
- -- Scan_Unsigned --
- -------------------
+ -----------------------
+ -- Scan_Raw_Unsigned --
+ -----------------------
- function Scan_Unsigned
- (Str : String;
- Ptr : access Integer;
- Max : Integer)
- return Unsigned
+ function Scan_Raw_Unsigned
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer) return Unsigned
is
P : Integer;
-- Local copy of the pointer
Expon : Integer;
-- Exponent value
- Minus : Boolean := False;
- -- Set to True if minus sign is present, otherwise to False. Note that
- -- a minus sign is permissible for the singular case of -0, and in any
- -- case the pointer is left pointing past a negative integer literal.
-
Overflow : Boolean := False;
-- Set True if overflow is detected at any point
- Start : Positive;
- -- Save location of first non-blank character
-
Base_Char : Character;
-- Base character (# or :) in based case
-- Digit value
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;
-
P := Ptr.all;
Uval := Character'Pos (Str (P)) - Character'Pos ('0');
P := P + 1;
-- Return result, dealing with sign and overflow
- if Overflow or else (Minus and then Uval /= 0) then
+ if Overflow then
raise Constraint_Error;
else
return Uval;
end if;
+ end Scan_Raw_Unsigned;
+
+ -------------------
+ -- Scan_Unsigned --
+ -------------------
+
+ function Scan_Unsigned
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer) return Unsigned
+ is
+ Start : Positive;
+ -- Save location of first non-blank character
+
+ begin
+ Scan_Plus_Sign (Str, Ptr, Max, Start);
+
+ if Str (Ptr.all) not in '0' .. '9' then
+ Ptr.all := Start;
+ raise Constraint_Error;
+ end if;
+
+ return Scan_Raw_Unsigned (Str, Ptr, Max);
end Scan_Unsigned;
--------------------
function Value_Unsigned (Str : String) return Unsigned is
V : Unsigned;
P : aliased Integer := Str'First;
-
begin
V := Scan_Unsigned (Str, P'Access, Str'Last);
Scan_Trailing_Blanks (Str, P);
return V;
-
end Value_Unsigned;
end System.Val_Uns;
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