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
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ W 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_WIU is
-----------------------------
-- Set_Image_Width_Integer --
-----------------------------
procedure Set_Image_Width_Integer
(V : Integer;
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_Width_Unsigned (Unsigned (V), 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_Width_Unsigned (Unsigned (-V), 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_Width_Integer;
------------------------------
-- Set_Image_Width_Unsigned --
------------------------------
procedure Set_Image_Width_Unsigned
(V : Unsigned;
W : Integer;
S : out String;
P : in out Natural)
is
Start : constant Natural := P;
F, T : Natural;
procedure Set_Digits (T : Unsigned);
-- Set digits of absolute value of T
procedure Set_Digits (T : Unsigned) is
begin
if T >= 10 then
Set_Digits (T / 10);
P := P + 1;
S (P) := Character'Val (T mod 10 + Character'Pos ('0'));
else
P := P + 1;
S (P) := Character'Val (T + Character'Pos ('0'));
end if;
end Set_Digits;
-- Start of processing for Set_Image_Width_Unsigned
begin
Set_Digits (V);
-- Add leading spaces if required by width parameter
if P - Start < W then
F := P;
P := P + (W - (P - Start));
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_Width_Unsigned;
end System.Img_WIU;
|
