File : s-imgbiu.adb
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
5 -- S Y S T E M . I M G _ B I U --
-- --
-- B o d y --
-- --
-- $Revision: 1.6 $ --
10 -- --
-- Copyright (C) 1992,1993,1994,1995 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- --
15 -- 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 --
20 -- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
25 -- 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. --
30 -- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
35
with System.Unsigned_Types; use System.Unsigned_Types;
package body System.Img_BIU is
40 -----------------------------
-- Set_Image_Based_Integer --
-----------------------------
procedure Set_Image_Based_Integer
45 (V : Integer;
B : Natural;
W : Integer;
S : out String;
P : in out Natural)
50 is
Start : Natural;
begin
-- Positive case can just use the unsigned circuit directly
55
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
60 -- careful not to generate overflow with the largest negative number.
else
P := P + 1;
S (P) := ' ';
65 Start := P;
declare
pragma Suppress (Overflow_Check);
pragma Suppress (Range_Check);
70 begin
Set_Image_Based_Unsigned (Unsigned (-V), B, W - 1, S, P);
end;
-- Set minus sign in last leading blank location. Because of the
75 -- code above, there must be at least one such location.
while S (Start + 1) = ' ' loop
Start := Start + 1;
end loop;
80
S (Start) := '-';
end if;
end Set_Image_Based_Integer;
85
------------------------------
-- Set_Image_Based_Unsigned --
------------------------------
90 procedure Set_Image_Based_Unsigned
(V : Unsigned;
B : Natural;
W : Integer;
S : out String;
95 P : in out Natural)
is
Start : constant Natural := P;
F, T : Natural;
BU : constant Unsigned := Unsigned (B);
100 Hex : constant array
(Unsigned range 0 .. 15) of Character := "0123456789ABCDEF";
procedure Set_Digits (T : Unsigned);
-- Set digits of absolute value of T
105
procedure Set_Digits (T : Unsigned) is
begin
if T >= BU then
Set_Digits (T / BU);
110 P := P + 1;
S (P) := Hex (T mod BU);
else
P := P + 1;
S (P) := Hex (T);
115 end if;
end Set_Digits;
-- Start of processing for Set_Image_Based_Unsigned
120 begin
if B >= 10 then
P := P + 1;
S (P) := '1';
125 end if;
P := P + 1;
S (P) := Character'Val (Character'Pos ('0') + B mod 10);
130 P := P + 1;
S (P) := '#';
Set_Digits (V);
135 P := P + 1;
S (P) := '#';
-- Add leading spaces if required by width parameter
140 if P - Start < W then
F := P;
P := Start + W;
T := P;
145 while F > Start loop
S (T) := S (F);
T := T - 1;
F := F - 1;
end loop;
150
for J in Start + 1 .. T loop
S (J) := ' ';
end loop;
end if;
155
end Set_Image_Based_Unsigned;
end System.Img_BIU;