+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . V A L _ L L D --
--- --
--- S p e c --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- Copyright (C) 1992,1993,1994,1995,1996 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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. --
--- --
-------------------------------------------------------------------------------
-
--- This package contains routines for scanning decimal values where the size
--- of the type is greater than Standard.Integer'Size, for use in Text_IO.
--- Decimal_IO, and the Value attribute for such decimal types.
-
-package System.Val_LLD is
-pragma Pure (Val_LLD);
-
- function Scan_Long_Long_Decimal
- (Str : String;
- Ptr : access Integer;
- Max : Integer;
- Scale : Integer)
- return Long_Long_Integer;
- -- 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 literal is found after scanning past any initial spaces,
- -- then Ptr.all is updated past the last character of the literal (but
- -- trailing spaces are not scanned out). The value returned is the value
- -- Long_Long_Integer'Integer_Value (decimal-literal-value), using the given
- -- Scale to determine this value.
- --
- -- If no valid real literal 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 exception Constraint_Error is raised.
- --
- -- 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: 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_Long_Long_Decimal
- (Str : String;
- Scale : Integer)
- return Long_Long_Integer;
- -- Used in computing X'Value (Str) where X is a decimal types whose size
- -- exceeds Standard.Integer'Size. Str is the string argument of the
- -- attribute. Constraint_Error is raised if the string is malformed
- -- or if the value is out of range, otherwise the value returned is the
- -- value Long_Long_Integer'Integer_Value (decimal-literal-value), using
- -- the given Scale to determine this value.
-
-end System.Val_LLD;
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