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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- S Y S T E M . V A L _ I N T --
--- --
--- S p e c --
--- --
--- Copyright (C) 1992-2005, 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, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, 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 signed Integer values for use
--- in Text_IO.Integer_IO, and the Value attribute.
-
-package System.Val_Int is
- pragma Pure;
-
- function Scan_Integer
- (Str : String;
- Ptr : access Integer;
- Max : Integer) return Integer;
- -- 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:
- --
- -- 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 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
- -- 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_Integer (Str : String) return Integer;
- -- Used in computing X'Value (Str) where X is a signed integer type whose
- -- base range does not exceed the base range of Integer. 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.
-
-end System.Val_Int;