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1 281 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT COMPILER COMPONENTS                         --
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--                                                                          --
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--                      S Y S T E M . V A L _ R E A L                       --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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package System.Val_Real is
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   pragma Pure;
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   function Scan_Real
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     (Str : String;
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      Ptr : not null access Integer;
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      Max : Integer) return Long_Long_Float;
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   --  This function scans the string starting at Str (Ptr.all) for a valid
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   --  real literal according to the syntax described in (RM 3.5(43)). The
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   --  substring scanned extends no further than Str (Max). There are three
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   --  cases for the return:
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   --
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   --  If a valid real is found after scanning past any initial spaces, then
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   --  Ptr.all is updated past the last character of the real (but trailing
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   --  spaces are not scanned out).
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   --
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   --  If no valid real is found, then Ptr.all points either to an initial
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   --  non-blank character, or to Max + 1 if the field is all spaces and the
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   --  exception Constraint_Error is raised.
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   --
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   --  If a syntactically valid real is scanned, but the value is out of
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   --  range, or, in the based case, the base value is out of range or there
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   --  is an out of range digit, then Ptr.all points past the real literal,
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   --  and Constraint_Error is raised.
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   --
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   --  Note: these rules correspond to the requirements for leaving the
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   --  pointer positioned in Text_Io.Get
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   --
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   --  Note: if Str is null, i.e. if Max is less than Ptr, then this is a
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   --  special case of an all-blank string, and Ptr is unchanged, and hence
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   --  is greater than Max as required in this case.
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   function Value_Real (Str : String) return Long_Long_Float;
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   --  Used in computing X'Value (Str) where X is a floating-point type or an
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   --  ordinary fixed-point type. Str is the string argument of the attribute.
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   --  Constraint_Error is raised if the string is malformed, or if the value
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   --  out of range of Long_Long_Float.
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end System.Val_Real;

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