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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . I M A G E _ B --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2023, 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_B is
-----------------------------
-- Set_Image_Based_Integer --
-----------------------------
procedure Set_Image_Based_Integer
(V : Int;
B : Natural;
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_Based_Unsigned (Uns (V), B, 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_Based_Unsigned (Uns (-V), B, 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_Based_Integer;
------------------------------
-- Set_Image_Based_Unsigned --
------------------------------
procedure Set_Image_Based_Unsigned
(V : Uns;
B : Natural;
W : Integer;
S : out String;
P : in out Natural)
is
Start : constant Natural := P + 1;
BU : constant Uns := Uns (B);
Hex : constant array
(Uns range 0 .. 15) of Character := "0123456789ABCDEF";
Nb_Digits : Natural := 1;
T : Uns := V;
begin
-- First we compute the number of characters needed for representing
-- the number.
loop
T := T / BU;
exit when T = 0;
Nb_Digits := Nb_Digits + 1;
end loop;
P := Start;
-- Pad S with spaces up to W reduced by Nb_Digits plus extra 3-4
-- characters needed for displaying the base.
while P < Start + W - Nb_Digits - 3 - B / 10 loop
S (P) := ' ';
P := P + 1;
end loop;
if B >= 10 then
S (P) := '1';
P := P + 1;
end if;
S (P) := Hex (BU mod 10);
P := P + 1;
S (P) := '#';
P := P + 1;
-- 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) := Hex (T mod BU);
T := T / BU;
end loop;
P := P + Nb_Digits;
S (P) := '#';
end Set_Image_Based_Unsigned;
end System.Image_B;
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