-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2006, 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- --
-- --
------------------------------------------------------------------------------
--- This package contains routines for scanning unsigned Long_Long_Unsigned
+-- This package contains routines for scanning modular Long_Long_Unsigned
-- values for use in Text_IO.Modular_IO, and the Value attribute.
with System.Unsigned_Types;
package System.Val_LLU is
pragma Pure;
- function Scan_Long_Long_Unsigned
- (Str : String;
- Ptr : access Integer;
- Max : Integer) return System.Unsigned_Types.Long_Long_Unsigned;
+ function Scan_Raw_Long_Long_Unsigned
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer) return System.Unsigned_Types.Long_Long_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_Long_Long_Unsigned
+ (Str : String;
+ Ptr : not null access Integer;
+ Max : Integer) return System.Unsigned_Types.Long_Long_Unsigned;
+ -- Same as Scan_Raw_Long_Long_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_Long_Long_Unsigned
(Str : String) return System.Unsigned_Types.Long_Long_Unsigned;
-- Used in computing X'Value (Str) where X is a modular integer type whose
OSDN Git Service
