File : s-imgwiu.adb
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
5 -- S Y S T E M . I M G _ W I U --
-- --
-- B o d y --
-- --
-- $Revision: 1.4 $ --
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_WIU is
40 -----------------------------
-- Set_Image_Width_Integer --
-----------------------------
procedure Set_Image_Width_Integer
45 (V : Integer;
W : Integer;
S : out String;
P : in out Natural)
is
50 Start : Natural;
begin
-- Positive case can just use the unsigned circuit directly
55 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.
60
else
P := P + 1;
S (P) := ' ';
Start := P;
65
declare
pragma Suppress (Overflow_Check);
pragma Suppress (Range_Check);
begin
70 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.
75
while S (Start + 1) = ' ' loop
Start := Start + 1;
end loop;
80 S (Start) := '-';
end if;
end Set_Image_Width_Integer;
85 ------------------------------
-- Set_Image_Width_Unsigned --
------------------------------
procedure Set_Image_Width_Unsigned
90 (V : Unsigned;
W : Integer;
S : out String;
P : in out Natural)
is
95 Start : constant Natural := P;
F, T : Natural;
procedure Set_Digits (T : Unsigned);
-- Set digits of absolute value of T
100
procedure Set_Digits (T : Unsigned) is
begin
if T >= 10 then
Set_Digits (T / 10);
105 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'));
110 end if;
end Set_Digits;
-- Start of processing for Set_Image_Width_Unsigned
115 begin
Set_Digits (V);
-- Add leading spaces if required by width parameter
120 if P - Start < W then
F := P;
P := P + (W - (P - Start));
T := P;
125 while F > Start loop
S (T) := S (F);
T := T - 1;
F := F - 1;
end loop;
130
for J in Start + 1 .. T loop
S (J) := ' ';
end loop;
end if;
135
end Set_Image_Width_Unsigned;
end System.Img_WIU;