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ADA Programming Guide
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s-imgint.adb
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1996-01-30
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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ I N T --
-- --
-- B o d y --
-- --
-- $Revision: 1.11 $ --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
package body System.Img_Int is
-------------------
-- Image_Integer --
-------------------
function Image_Integer
(V : Integer;
S : access String)
return Natural
is
P : Natural;
begin
if V >= 0 then
P := 1;
S (P) := ' ';
else
P := 0;
end if;
Set_Image_Integer (V, S.all, P);
return P;
end Image_Integer;
-----------------------
-- Set_Image_Integer --
-----------------------
procedure Set_Image_Integer
(V : Integer;
S : out String;
P : in out Natural)
is
procedure Set_Digits (T : Integer);
-- Set digits of absolute value of T, which is zero or negative. We work
-- with the negative of the value so that the largest negative number is
-- not a special case.
procedure Set_Digits (T : Integer) is
begin
if T <= -10 then
Set_Digits (T / 10);
P := P + 1;
S (P) := Character'Val (48 - (T rem 10));
else
P := P + 1;
S (P) := Character'Val (48 - T);
end if;
end Set_Digits;
-- Start of processing for Set_Image_Integer
begin
if V >= 0 then
Set_Digits (-V);
else
P := P + 1;
S (P) := '-';
Set_Digits (V);
end if;
end Set_Image_Integer;
end System.Img_Int;