1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . V A L _ L L I                        --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--   Copyright (C) 1992,1993,1994,1995,1996 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 2,  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.  See the GNU General Public License --
17-- for  more details.  You should have  received  a copy of the GNU General --
18-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
19-- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
20-- MA 02111-1307, USA.                                                      --
21--                                                                          --
22-- As a special exception,  if other files  instantiate  generics from this --
23-- unit, or you link  this unit with other files  to produce an executable, --
24-- this  unit  does not  by itself cause  the resulting  executable  to  be --
25-- covered  by the  GNU  General  Public  License.  This exception does not --
26-- however invalidate  any other reasons why  the executable file  might be --
27-- covered by the  GNU Public License.                                      --
28--                                                                          --
29-- GNAT was originally developed  by the GNAT team at  New York University. --
30-- Extensive contributions were provided by Ada Core Technologies Inc.      --
31--                                                                          --
32------------------------------------------------------------------------------
33
34with System.Unsigned_Types; use System.Unsigned_Types;
35with System.Val_LLU;        use System.Val_LLU;
36with System.Val_Util;       use System.Val_Util;
37
38package body System.Val_LLI is
39
40   ---------------------------
41   -- Scn_Long_Long_Integer --
42   ---------------------------
43
44   function Scan_Long_Long_Integer
45     (Str  : String;
46      Ptr  : access Integer;
47      Max  : Integer)
48      return Long_Long_Integer
49   is
50      Uval : Long_Long_Unsigned;
51      --  Unsigned result
52
53      Minus : Boolean := False;
54      --  Set to True if minus sign is present, otherwise to False
55
56      Start : Positive;
57      --  Saves location of first non-blank (not used in this case)
58
59   begin
60      Scan_Sign (Str, Ptr, Max, Minus, Start);
61      Uval := Scan_Long_Long_Unsigned (Str, Ptr, Max);
62
63      --  Deal with overflow cases, and also with maximum negative number
64
65      if Uval > Long_Long_Unsigned (Long_Long_Integer'Last) then
66         if Minus
67           and then Uval = Long_Long_Unsigned (-(Long_Long_Integer'First)) then
68            return Long_Long_Integer'First;
69         else
70            raise Constraint_Error;
71         end if;
72
73      --  Negative values
74
75      elsif Minus then
76         return -(Long_Long_Integer (Uval));
77
78      --  Positive values
79
80      else
81         return Long_Long_Integer (Uval);
82      end if;
83
84   end Scan_Long_Long_Integer;
85
86   -----------------------------
87   -- Value_Long_Long_Integer --
88   -----------------------------
89
90   function Value_Long_Long_Integer (Str : String) return Long_Long_Integer is
91      V : Long_Long_Integer;
92      P : aliased Integer := Str'First;
93
94   begin
95      V := Scan_Long_Long_Integer (Str, P'Access, Str'Last);
96      Scan_Trailing_Blanks (Str, P);
97      return V;
98
99   end Value_Long_Long_Integer;
100
101end System.Val_LLI;
102