1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . V A L _ L L I                        --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2012, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32with System.Unsigned_Types; use System.Unsigned_Types;
33with System.Val_LLU;        use System.Val_LLU;
34with System.Val_Util;       use System.Val_Util;
35
36package body System.Val_LLI is
37
38   ----------------------------
39   -- Scan_Long_Long_Integer --
40   ----------------------------
41
42   function Scan_Long_Long_Integer
43     (Str  : String;
44      Ptr  : not null access Integer;
45      Max  : Integer) return Long_Long_Integer
46   is
47      Uval : Long_Long_Unsigned;
48      --  Unsigned result
49
50      Minus : Boolean := False;
51      --  Set to True if minus sign is present, otherwise to False
52
53      Start : Positive;
54      --  Saves location of first non-blank (not used in this case)
55
56   begin
57      Scan_Sign (Str, Ptr, Max, Minus, Start);
58
59      if Str (Ptr.all) not in '0' .. '9' then
60         Ptr.all := Start;
61         Bad_Value (Str);
62      end if;
63
64      Uval := Scan_Raw_Long_Long_Unsigned (Str, Ptr, Max);
65
66      --  Deal with overflow cases, and also with maximum negative number
67
68      if Uval > Long_Long_Unsigned (Long_Long_Integer'Last) then
69         if Minus
70           and then Uval = Long_Long_Unsigned (-(Long_Long_Integer'First))
71         then
72            return Long_Long_Integer'First;
73         else
74            Bad_Value (Str);
75         end if;
76
77      --  Negative values
78
79      elsif Minus then
80         return -(Long_Long_Integer (Uval));
81
82      --  Positive values
83
84      else
85         return Long_Long_Integer (Uval);
86      end if;
87   end Scan_Long_Long_Integer;
88
89   -----------------------------
90   -- Value_Long_Long_Integer --
91   -----------------------------
92
93   function Value_Long_Long_Integer (Str : String) return Long_Long_Integer is
94      V : Long_Long_Integer;
95      P : aliased Integer := Str'First;
96   begin
97      V := Scan_Long_Long_Integer (Str, P'Access, Str'Last);
98      Scan_Trailing_Blanks (Str, P);
99      return V;
100   end Value_Long_Long_Integer;
101
102end System.Val_LLI;
103