1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . I M G _ I N T                        --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2009, 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
32package body System.Img_Int is
33
34   -------------------
35   -- Image_Integer --
36   -------------------
37
38   procedure Image_Integer
39     (V : Integer;
40      S : in out String;
41      P : out Natural)
42   is
43      pragma Assert (S'First = 1);
44
45      procedure Set_Digits (T : Integer);
46      --  Set digits of absolute value of T, which is zero or negative. We work
47      --  with the negative of the value so that the largest negative number is
48      --  not a special case.
49
50      ----------------
51      -- Set_Digits --
52      ----------------
53
54      procedure Set_Digits (T : Integer) is
55      begin
56         if T <= -10 then
57            Set_Digits (T / 10);
58            P := P + 1;
59            S (P) := Character'Val (48 - (T rem 10));
60         else
61            P := P + 1;
62            S (P) := Character'Val (48 - T);
63         end if;
64      end Set_Digits;
65
66   --  Start of processing for Image_Integer
67
68   begin
69      P := 1;
70
71      if V >= 0 then
72         S (P) := ' ';
73         Set_Digits (-V);
74      else
75         S (P) := '-';
76         Set_Digits (V);
77      end if;
78   end Image_Integer;
79
80   -----------------------
81   -- Set_Image_Integer --
82   -----------------------
83
84   procedure Set_Image_Integer
85     (V : Integer;
86      S : in out String;
87      P : in out Natural)
88   is
89      procedure Set_Digits (T : Integer);
90      --  Set digits of absolute value of T, which is zero or negative. We work
91      --  with the negative of the value so that the largest negative number is
92      --  not a special case.
93
94      ----------------
95      -- Set_Digits --
96      ----------------
97
98      procedure Set_Digits (T : Integer) is
99      begin
100         if T <= -10 then
101            Set_Digits (T / 10);
102            P := P + 1;
103            S (P) := Character'Val (48 - (T rem 10));
104         else
105            P := P + 1;
106            S (P) := Character'Val (48 - T);
107         end if;
108      end Set_Digits;
109
110   --  Start of processing for Set_Image_Integer
111
112   begin
113      if V >= 0 then
114         Set_Digits (-V);
115      else
116         P := P + 1;
117         S (P) := '-';
118         Set_Digits (V);
119      end if;
120   end Set_Image_Integer;
121
122end System.Img_Int;
123