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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . V A L _ R E A L --
+-- --
+-- S p e c --
+-- --
+-- 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 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. --
+-- --
+-- 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. --
+-- --
+------------------------------------------------------------------------------
+
+package System.Val_Real is
+ pragma Pure;
+
+ function Scan_Real
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer) return Long_Long_Float;
+ -- This function scans the string starting at Str (Ptr.all) for a valid
+ -- real literal 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:
+ --
+ -- If a valid real is found after scanning past any initial spaces, then
+ -- Ptr.all is updated past the last character of the real (but trailing
+ -- spaces are not scanned out).
+ --
+ -- If no valid real is found, then Ptr.all points either to an initial
+ -- non-blank character, or to Max + 1 if the field is all spaces and the
+ -- exception Constraint_Error is raised.
+ --
+ -- If a syntactically valid real 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 real literal,
+ -- and Constraint_Error is raised.
+ --
+ -- Note: these rules correspond to the requirements for leaving the
+ -- pointer positioned in Text_Io.Get
+ --
+ -- Note: if Str is null, 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 Value_Real (Str : String) return Long_Long_Float;
+ -- Used in computing X'Value (Str) where X is a floating-point type or an
+ -- ordinary fixed-point type. Str is the string argument of the attribute.
+ -- Constraint_Error is raised if the string is malformed, or if the value
+ -- out of range of Long_Long_Float.
+
+end System.Val_Real;