-- --
-- S p e c --
-- --
--- Copyright (C) 1992,1993,1994,1995,1996 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, 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. --
+-- 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. --
+-- --
+-- 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. --
------------------------------------------------------------------------------
-- This package contains routines for scanning modular Unsigned
--- values for use in Text_IO.Modular, and the Value attribute.
+-- values for use in Text_IO.Modular_IO, and the Value attribute.
with System.Unsigned_Types;
package System.Val_Uns is
-pragma Pure (Val_Uns);
+ pragma Pure;
- function Scan_Unsigned
- (Str : String;
- Ptr : access Integer;
- Max : Integer)
- return System.Unsigned_Types.Unsigned;
+ function Scan_Raw_Unsigned
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer) return System.Unsigned_Types.Unsigned;
-- This function scans the string starting at Str (Ptr.all) for a valid
-- integer according to the syntax described in (RM 3.5(43)). The substring
- -- scanned extends no further than Str (Max). There are three cases for the
- -- return:
+ -- scanned extends no further than Str (Max). Note: this does not scan
+ -- leading or trailing blanks, nor leading sign.
+ --
+ -- There are three cases for the return:
--
- -- If a valid integer is found after scanning past any initial spaces, then
- -- Ptr.all is updated past the last character of the integer (but trailing
- -- spaces are not scanned out).
+ -- If a valid integer is found, then Ptr.all is updated past the last
+ -- character of the integer.
--
-- If no valid integer is found, then Ptr.all points either to an initial
-- non-digit character, or to Max + 1 if the field is all spaces and the
-- If a syntactically valid integer is scanned, but the value is out of
-- range, or, in the based case, the base value is out of range or there
-- is an out of range digit, then Ptr.all points past the integer, and
- -- Constraint_Error is raised. Note that if a minus sign is present, and
- -- the integer value is non-zero, then constraint error will be raised.
+ -- Constraint_Error is raised.
--
-- Note: these rules correspond to the requirements for leaving the pointer
- -- positioned in Text_Io.Get
+ -- positioned in Text_IO.Get
--
- -- Note: if Str is null, i.e. if Max is less than Ptr, then this is a
+ -- Note: if Str is empty, i.e. if Max is less than Ptr, then this is a
-- special case of an all-blank string, and Ptr is unchanged, and hence
-- is greater than Max as required in this case.
+ function Scan_Unsigned
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer) return System.Unsigned_Types.Unsigned;
+ -- Same as Scan_Raw_Unsigned, except scans optional leading
+ -- blanks, and an optional leading plus sign.
+ -- Note: if a minus sign is present, Constraint_Error will be raised.
+ -- Note: trailing blanks are not scanned.
+
function Value_Unsigned
- (Str : String)
- return System.Unsigned_Types.Unsigned;
+ (Str : String) return System.Unsigned_Types.Unsigned;
-- Used in computing X'Value (Str) where X is a modular integer type whose
-- modulus does not exceed the range of System.Unsigned_Types.Unsigned. Str
-- is the string argument of the attribute. Constraint_Error is raised if
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