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1996-09-28
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5KB
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130 lines
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ L L W --
-- --
-- B o d y --
-- --
-- $Revision: 1.2 $ --
-- --
-- Copyright (c) 1992,1993,1994 NYU, All Rights Reserved --
-- --
-- The GNAT library is free software; you can redistribute it and/or modify --
-- it under terms of the GNU Library General Public License as published by --
-- the Free Software Foundation; either version 2, or (at your option) any --
-- later version. The GNAT library is distributed in the hope that it will --
-- be useful, but WITHOUT ANY WARRANTY; without even the implied warranty --
-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- Library General Public License for more details. You should have --
-- received a copy of the GNU Library General Public License along with --
-- the GNAT library; see the file COPYING.LIB. If not, write to the Free --
-- Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. --
-- --
------------------------------------------------------------------------------
with System.Unsigned_Types; use System.Unsigned_Types;
package body System.Img_LLW is
---------------------------------------
-- Set_Image_Width_Long_Long_Integer --
---------------------------------------
procedure Set_Image_Width_Long_Long_Integer
(V : Long_Long_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_Long_Long_Unsigned
(Long_Long_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;
begin
pragma Suppress (Overflow_Check);
pragma Suppress (Range_Check);
Set_Image_Width_Long_Long_Unsigned
(Long_Long_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_Long_Long_Integer;
----------------------------------------
-- Set_Image_Width_Long_Long_Unsigned --
----------------------------------------
procedure Set_Image_Width_Long_Long_Unsigned
(V : Long_Long_Unsigned;
W : Integer;
S : out String;
P : in out Natural)
is
Start : constant Natural := P;
F, T : Natural;
procedure Set_Digits (T : Long_Long_Unsigned);
-- Set digits of absolute value of T
procedure Set_Digits (T : Long_Long_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_Long_Long_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_Long_Long_Unsigned;
end System.Img_LLW;