aboutsummaryrefslogtreecommitdiff
path: root/gcc/ada/s-imgbiu.adb
blob: 05376104333c479ee788edabb9749064bb496c94 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                       S Y S T E M . I M G _ B I U                        --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2005 Free Software Foundation, Inc.          --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 2,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT;  see file COPYING.  If not, write --
-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
-- Boston, MA 02110-1301, USA.                                              --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable  to  be --
-- covered  by the  GNU  General  Public  License.  This exception does not --
-- however invalidate  any other reasons why  the executable file  might be --
-- covered by the  GNU Public License.                                      --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with System.Unsigned_Types; use System.Unsigned_Types;

package body System.Img_BIU is

   -----------------------------
   -- Set_Image_Based_Integer --
   -----------------------------

   procedure Set_Image_Based_Integer
     (V : Integer;
      B : Natural;
      W : Integer;
      S : out String;
      P : in out Natural)
   is
      Start : Natural;

   begin
      --  Positive case can just use the unsigned circuit directly

      if V >= 0 then
         Set_Image_Based_Unsigned (Unsigned (V), B, W, S, P);

      --  Negative case has to set a minus sign. Note also that we have to be
      --  careful not to generate overflow with the largest negative number.

      else
         P := P + 1;
         S (P) := ' ';
         Start := P;

         declare
            pragma Suppress (Overflow_Check);
            pragma Suppress (Range_Check);
         begin
            Set_Image_Based_Unsigned (Unsigned (-V), B, W - 1, S, P);
         end;

         --  Set minus sign in last leading blank location. Because of the
         --  code above, there must be at least one such location.

         while S (Start + 1) = ' ' loop
            Start := Start + 1;
         end loop;

         S (Start) := '-';
      end if;

   end Set_Image_Based_Integer;

   ------------------------------
   -- Set_Image_Based_Unsigned --
   ------------------------------

   procedure Set_Image_Based_Unsigned
     (V : Unsigned;
      B : Natural;
      W : Integer;
      S : out String;
      P : in out Natural)
   is
      Start : constant Natural := P;
      F, T  : Natural;
      BU    : constant Unsigned := Unsigned (B);
      Hex   : constant array
                (Unsigned range 0 .. 15) of Character := "0123456789ABCDEF";

      procedure Set_Digits (T : Unsigned);
      --  Set digits of absolute value of T

      procedure Set_Digits (T : Unsigned) is
      begin
         if T >= BU then
            Set_Digits (T / BU);
            P := P + 1;
            S (P) := Hex (T mod BU);
         else
            P := P + 1;
            S (P) := Hex (T);
         end if;
      end Set_Digits;

   --  Start of processing for Set_Image_Based_Unsigned

   begin

      if B >= 10 then
         P := P + 1;
         S (P) := '1';
      end if;

      P := P + 1;
      S (P) := Character'Val (Character'Pos ('0') + B mod 10);

      P := P + 1;
      S (P) := '#';

      Set_Digits (V);

      P := P + 1;
      S (P) := '#';

      --  Add leading spaces if required by width parameter

      if P - Start < W then
         F := P;
         P := Start + W;
         T := P;

         while F > Start loop
            S (T) := S (F);
            T := T - 1;
            F := F - 1;
         end loop;

         for J in Start + 1 .. T loop
            S (J) := ' ';
         end loop;
      end if;

   end Set_Image_Based_Unsigned;

end System.Img_BIU;