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1996-01-30
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------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ R E A L --
-- --
-- S p e c --
-- --
-- $Revision: 1.6 $ --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
-- Image for fixed and float types (also used for Float_IO/Fixed_IO output)
package System.Img_Real is
pragma Preelaborate (Img_Real);
function Image_Ordinary_Fixed_Point
(V : Long_Long_Float;
S : access String;
Aft : Natural)
return Natural;
-- Computes the image of V and stores the resulting string in S (1 .. N)
-- according to the rules for image for fixed-point types (RM 3.5(34)),
-- where Aft is the value of the Aft attribute for the fixed-point type.
-- This function is used only for ordinary fixed point (see package
-- System.Img_Decimal for handling of decimal fixed-point). The caller
-- guarantees that the string is long enough.
function Image_Floating_Point
(V : Long_Long_Float;
S : access String;
Digs : Natural)
return Natural;
-- Computes the image of V and stores the resulting string in S (1 .. N)
-- according to the rules for image for foating-point types (RM 3.5(33)),
-- where Digs is the value of the Digits attribute for the floating-point
-- type. The caller guarantees that the string is long enough.
procedure Set_Image_Real
(V : Long_Long_Float;
S : out String;
P : in out Natural;
Fore : Natural;
Aft : Natural;
Exp : Natural);
-- Sets the image of V starting at S (P + 1), updating P to point to the
-- last character stored, the caller promises that the buffer is large
-- enough and no check is made for this. Constraint_Error will not
-- necessarily beraised if this is violated, since it is perfectly valid
-- to compile this unit with checks off). The Fore, Aft and Exp values
-- can be set to any valid values for the case of use from Text_IO.
end System.Img_Real;