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1996-09-28
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74 lines
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ D E C --
-- --
-- S p e c --
-- --
-- $Revision: 1.4 $ --
-- --
-- Copyright (c) 1992,1993,1994,1995 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 decimal fixed types where the size of the corresponding integer
-- type does not exceed Integer'Size (also used for Text_IO.Decimal_IO output)
package System.Img_Dec is
pragma Preelaborate (Img_Dec);
function Image_Decimal
(V : Integer;
Scale : Integer)
return String;
-- Compute 'Image of V, the integer value (in units of delta) of a decimal
-- type whose Scale is as given and return the result. THe image is given
-- by the rules in RM 3.5(34) for fixed-point type image functions.
procedure Set_Image_Decimal
(V : Integer;
S : out String;
P : in out Natural;
Scale : Integer;
Fore : Natural;
Aft : Natural;
Exp : Natural);
-- Sets the image of V, where V is the integer value (in units of delta)
-- of a decimal type with the given Scale, 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 be raised if this requirement 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
-- by Text_IO.Decimal_IO.
procedure Set_Decimal_Digits
(Digs : in out String;
NDigs : Natural;
S : out String;
P : in out Natural;
Scale : Integer;
Fore : Natural;
Aft : Natural;
Exp : Natural);
-- This procedure has the same semantics as Set_Image_Decimal, except that
-- the value in Digs (1 .. NDigs) is given as a string of decimal digits
-- preceded by either a minus sign or a space (i.e. the integer image of
-- the value in units of delta). The call may destroy the value in Digs,
-- which is why Digs is in-out (this happens if rounding is required).
-- Set_Decimal_Digits is shared by all the decimal image routines.
end System.Img_Dec;