File : s-imgbiu.adb
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME COMPONENTS --
4 -- --
5 -- S Y S T E M . I M G _ B I U --
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 -- --
19 -- --
20 -- --
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
32 with System.Unsigned_Types; use System.Unsigned_Types;
33
34 package body System.Img_BIU is
35
36 -----------------------------
37 -- Set_Image_Based_Integer --
38 -----------------------------
39
40 procedure Set_Image_Based_Integer
41 (V : 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_Unsigned (Unsigned (V), B, 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_Based_Unsigned (Unsigned (-V), B, W - 1, S, P);
68 end;
69
70 -- Set minus sign in last leading blank location. Because of the
71 -- code above, there must be at least one such location.
72
73 while S (Start + 1) = ' ' loop
74 Start := Start + 1;
75 end loop;
76
77 S (Start) := '-';
78 end if;
79
80 end Set_Image_Based_Integer;
81
82 ------------------------------
83 -- Set_Image_Based_Unsigned --
84 ------------------------------
85
86 procedure Set_Image_Based_Unsigned
87 (V : Unsigned;
88 B : Natural;
89 W : Integer;
90 S : out String;
91 P : in out Natural)
92 is
93 Start : constant Natural := P;
94 F, T : Natural;
95 BU : constant Unsigned := Unsigned (B);
96 Hex : constant array
97 (Unsigned range 0 .. 15) of Character := "0123456789ABCDEF";
98
99 procedure Set_Digits (T : Unsigned);
100 -- Set digits of absolute value of T
101
102 ----------------
103 -- Set_Digits --
104 ----------------
105
106 procedure Set_Digits (T : Unsigned) is
107 begin
108 if T >= BU then
109 Set_Digits (T / BU);
110 P := P + 1;
111 S (P) := Hex (T mod BU);
112 else
113 P := P + 1;
114 S (P) := Hex (T);
115 end if;
116 end Set_Digits;
117
118 -- Start of processing for Set_Image_Based_Unsigned
119
120 begin
121
122 if B >= 10 then
123 P := P + 1;
124 S (P) := '1';
125 end if;
126
127 P := P + 1;
128 S (P) := Character'Val (Character'Pos ('0') + B mod 10);
129
130 P := P + 1;
131 S (P) := '#';
132
133 Set_Digits (V);
134
135 P := P + 1;
136 S (P) := '#';
137
138 -- Add leading spaces if required by width parameter
139
140 if P - Start < W then
141 F := P;
142 P := Start + W;
143 T := P;
144
145 while F > Start loop
146 S (T) := S (F);
147 T := T - 1;
148 F := F - 1;
149 end loop;
150
151 for J in Start + 1 .. T loop
152 S (J) := ' ';
153 end loop;
154 end if;
155
156 end Set_Image_Based_Unsigned;
157
158 end System.Img_BIU;