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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . I M A G E _ W --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2024, 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- --
-- ware Foundation; either version 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
package body System.Image_W is
-----------------------------
-- Set_Image_Width_Integer --
-----------------------------
procedure Set_Image_Width_Integer
(V : Int;
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_Unsigned (Uns (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;
declare
pragma Suppress (Overflow_Check);
pragma Suppress (Range_Check);
begin
Set_Image_Width_Unsigned (Uns (-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_Integer;
------------------------------
-- Set_Image_Width_Unsigned --
------------------------------
procedure Set_Image_Width_Unsigned
(V : Uns;
W : Integer;
S : out String;
P : in out Natural)
is
Start : constant Natural := P + 1;
Nb_Digits : Natural := 1;
T : Uns := V;
begin
-- First we compute the number of characters needed for representing
-- the number.
loop
T := T / 10;
exit when T = 0;
Nb_Digits := Nb_Digits + 1;
end loop;
P := Start;
-- Pad S with spaces up to W reduced by Nb_Digits
while P < Start + W - Nb_Digits loop
S (P) := ' ';
P := P + 1;
end loop;
-- We now populate digits from the end of the value to the beginning
T := V;
for J in reverse P .. P + Nb_Digits - 1 loop
S (J) := Character'Val (T mod 10 + Character'Pos ('0'));
T := T / 10;
end loop;
P := P + Nb_Digits - 1;
end Set_Image_Width_Unsigned;
end System.Image_W;
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