1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . I M G _ L L B                        --
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
32with System.Unsigned_Types; use System.Unsigned_Types;
33
34package body System.Img_LLB is
35
36   ---------------------------------------
37   -- Set_Image_Based_Long_Long_Integer --
38   ---------------------------------------
39
40   procedure Set_Image_Based_Long_Long_Integer
41     (V : Long_Long_Integer;
42      B : Natural;
43      W : Integer;
44      S : out String;
45      P : in out Natural)
46   is
47      Start : Natural;
48
49   begin
50      --  Positive case can just use the unsigned circuit directly
51
52      if V >= 0 then
53         Set_Image_Based_Long_Long_Unsigned
54           (Long_Long_Unsigned (V), B, W, S, P);
55
56      --  Negative case has to set a minus sign. Note also that we have to be
57      --  careful not to generate overflow with the largest negative number.
58
59      else
60         P := P + 1;
61         S (P) := ' ';
62         Start := P;
63
64         declare
65            pragma Suppress (Overflow_Check);
66            pragma Suppress (Range_Check);
67         begin
68            Set_Image_Based_Long_Long_Unsigned
69              (Long_Long_Unsigned (-V), B, W - 1, S, P);
70         end;
71
72         --  Set minus sign in last leading blank location. Because of the
73         --  code above, there must be at least one such location.
74
75         while S (Start + 1) = ' ' loop
76            Start := Start + 1;
77         end loop;
78
79         S (Start) := '-';
80      end if;
81
82   end Set_Image_Based_Long_Long_Integer;
83
84   ----------------------------------------
85   -- Set_Image_Based_Long_Long_Unsigned --
86   ----------------------------------------
87
88   procedure Set_Image_Based_Long_Long_Unsigned
89     (V : Long_Long_Unsigned;
90      B : Natural;
91      W : Integer;
92      S : out String;
93      P : in out Natural)
94   is
95      Start : constant Natural := P;
96      F, T  : Natural;
97      BU    : constant Long_Long_Unsigned := Long_Long_Unsigned (B);
98      Hex   : constant array
99                (Long_Long_Unsigned range 0 .. 15) of Character :=
100                                                         "0123456789ABCDEF";
101
102      procedure Set_Digits (T : Long_Long_Unsigned);
103      --  Set digits of absolute value of T
104
105      procedure Set_Digits (T : Long_Long_Unsigned) is
106      begin
107         if T >= BU then
108            Set_Digits (T / BU);
109            P := P + 1;
110            S (P) := Hex (T mod BU);
111         else
112            P := P + 1;
113            S (P) := Hex (T);
114         end if;
115      end Set_Digits;
116
117   --  Start of processing for Set_Image_Based_Long_Long_Unsigned
118
119   begin
120
121      if B >= 10 then
122         P := P + 1;
123         S (P) := '1';
124      end if;
125
126      P := P + 1;
127      S (P) := Character'Val (Character'Pos ('0') + B mod 10);
128
129      P := P + 1;
130      S (P) := '#';
131
132      Set_Digits (V);
133
134      P := P + 1;
135      S (P) := '#';
136
137      --  Add leading spaces if required by width parameter
138
139      if P - Start < W then
140         F := P;
141         P := Start + W;
142         T := P;
143
144         while F > Start loop
145            S (T) := S (F);
146            T := T - 1;
147            F := F - 1;
148         end loop;
149
150         for J in Start + 1 .. T loop
151            S (J) := ' ';
152         end loop;
153      end if;
154
155   end Set_Image_Based_Long_Long_Unsigned;
156
157end System.Img_LLB;
158