1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . V A L _ L L I --
10 -- Copyright (C) 1992,1993,1994,1995,1996 Free Software Foundation, Inc. --
12 -- GNAT is free software; you can redistribute it and/or modify it under --
13 -- terms of the GNU General Public License as published by the Free Soft- --
14 -- ware Foundation; either version 2, or (at your option) any later ver- --
15 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
16 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
17 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
18 -- for more details. You should have received a copy of the GNU General --
19 -- Public License distributed with GNAT; see file COPYING. If not, write --
20 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
21 -- MA 02111-1307, USA. --
23 -- As a special exception, if other files instantiate generics from this --
24 -- unit, or you link this unit with other files to produce an executable, --
25 -- this unit does not by itself cause the resulting executable to be --
26 -- covered by the GNU General Public License. This exception does not --
27 -- however invalidate any other reasons why the executable file might be --
28 -- covered by the GNU Public License. --
30 -- GNAT was originally developed by the GNAT team at New York University. --
31 -- Extensive contributions were provided by Ada Core Technologies Inc. --
33 ------------------------------------------------------------------------------
35 -- This package contains routines for scanning signed Long_Long_Integer
36 -- values for use in Text_IO.Integer_IO, and the Value attribute.
38 package System
.Val_LLI
is
39 pragma Pure
(Val_LLI
);
41 function Scan_Long_Long_Integer
45 return Long_Long_Integer;
46 -- This function scans the string starting at Str (Ptr.all) for a valid
47 -- integer according to the syntax described in (RM 3.5(43)). The substring
48 -- scanned extends no further than Str (Max). There are three cases for the
51 -- If a valid integer is found after scanning past any initial spaces, then
52 -- Ptr.all is updated past the last character of the integer (but trailing
53 -- spaces are not scanned out).
55 -- If no valid integer is found, then Ptr.all points either to an initial
56 -- non-digit character, or to Max + 1 if the field is all spaces and the
57 -- exception Constraint_Error is raised.
59 -- If a syntactically valid integer is scanned, but the value is out of
60 -- range, or, in the based case, the base value is out of range or there
61 -- is an out of range digit, then Ptr.all points past the integer, and
62 -- Constraint_Error is raised.
64 -- Note: these rules correspond to the requirements for leaving the pointer
65 -- positioned in Text_Io.Get
67 -- Note: if Str is null, i.e. if Max is less than Ptr, then this is a
68 -- special case of an all-blank string, and Ptr is unchanged, and hence
69 -- is greater than Max as required in this case.
71 function Value_Long_Long_Integer
(Str
: String) return Long_Long_Integer;
72 -- Used in computing X'Value (Str) where X is a signed integer type whose
73 -- base range exceeds the base range of Integer. Str is the string argument
74 -- of the attribute. Constraint_Error is raised if the string is malformed,
75 -- or if the value is out of range.