1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . I M G _ L L W                        --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2014, 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;
33
34package body System.Img_LLW is
35
36   ---------------------------------------
37   -- Set_Image_Width_Long_Long_Integer --
38   ---------------------------------------
39
40   procedure Set_Image_Width_Long_Long_Integer
41     (V : Long_Long_Integer;
42      W : Integer;
43      S : out String;
44      P : in out Natural)
45   is
46      Start : Natural;
47
48   begin
49      --  Positive case can just use the unsigned circuit directly
50
51      if V >= 0 then
52         Set_Image_Width_Long_Long_Unsigned
53           (Long_Long_Unsigned (V), W, S, P);
54
55      --  Negative case has to set a minus sign. Note also that we have to be
56      --  careful not to generate overflow with the largest negative number.
57
58      else
59         P := P + 1;
60         S (P) := ' ';
61         Start := P;
62
63         declare
64            pragma Suppress (Overflow_Check);
65            pragma Suppress (Range_Check);
66         begin
67            Set_Image_Width_Long_Long_Unsigned
68              (Long_Long_Unsigned (-V), W - 1, S, P);
69         end;
70
71         --  Set minus sign in last leading blank location. Because of the
72         --  code above, there must be at least one such location.
73
74         while S (Start + 1) = ' ' loop
75            Start := Start + 1;
76         end loop;
77
78         S (Start) := '-';
79      end if;
80
81   end Set_Image_Width_Long_Long_Integer;
82
83   ----------------------------------------
84   -- Set_Image_Width_Long_Long_Unsigned --
85   ----------------------------------------
86
87   procedure Set_Image_Width_Long_Long_Unsigned
88     (V : Long_Long_Unsigned;
89      W : Integer;
90      S : out String;
91      P : in out Natural)
92   is
93      Start : constant Natural := P;
94      F, T  : Natural;
95
96      procedure Set_Digits (T : Long_Long_Unsigned);
97      --  Set digits of absolute value of T
98
99      ----------------
100      -- Set_Digits --
101      ----------------
102
103      procedure Set_Digits (T : Long_Long_Unsigned) is
104      begin
105         if T >= 10 then
106            Set_Digits (T / 10);
107            P := P + 1;
108            S (P) := Character'Val (T mod 10 + Character'Pos ('0'));
109         else
110            P := P + 1;
111            S (P) := Character'Val (T + Character'Pos ('0'));
112         end if;
113      end Set_Digits;
114
115   --  Start of processing for Set_Image_Width_Long_Long_Unsigned
116
117   begin
118      Set_Digits (V);
119
120      --  Add leading spaces if required by width parameter
121
122      if P - Start < W then
123         F := P;
124         P := P + (W - (P - Start));
125         T := P;
126
127         while F > Start loop
128            S (T) := S (F);
129            T := T - 1;
130            F := F - 1;
131         end loop;
132
133         for J in Start + 1 .. T loop
134            S (J) := ' ';
135         end loop;
136      end if;
137
138   end Set_Image_Width_Long_Long_Unsigned;
139
140end System.Img_LLW;
141