File : s-imgllb.adb
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) 1992-2014, 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_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 ----------------
106 -- Set_Digits --
107 ----------------
108
109 procedure Set_Digits (T : Long_Long_Unsigned) is
110 begin
111 if T >= BU then
112 Set_Digits (T / BU);
113 P := P + 1;
114 S (P) := Hex (T mod BU);
115 else
116 P := P + 1;
117 S (P) := Hex (T);
118 end if;
119 end Set_Digits;
120
121 -- Start of processing for Set_Image_Based_Long_Long_Unsigned
122
123 begin
124
125 if B >= 10 then
126 P := P + 1;
127 S (P) := '1';
128 end if;
129
130 P := P + 1;
131 S (P) := Character'Val (Character'Pos ('0') + B mod 10);
132
133 P := P + 1;
134 S (P) := '#';
135
136 Set_Digits (V);
137
138 P := P + 1;
139 S (P) := '#';
140
141 -- Add leading spaces if required by width parameter
142
143 if P - Start < W then
144 F := P;
145 P := Start + W;
146 T := P;
147
148 while F > Start loop
149 S (T) := S (F);
150 T := T - 1;
151 F := F - 1;
152 end loop;
153
154 for J in Start + 1 .. T loop
155 S (J) := ' ';
156 end loop;
157 end if;
158
159 end Set_Image_Based_Long_Long_Unsigned;
160
161 end System.Img_LLB;